应用生态学报最新文献

{"title":"Characterization of zooplankton communities and the interspecific relationships among dominant species in the Jinghe River Basin, Northwest China.","authors":"Si-Quan Wang, Bao-Zhu Pan, Zi-Jie Yang, En Hu, Xin Zhang, Gang Li, Dan Zhao, Jing-Xiang Hu","doi":"10.13287/j.1001-9332.202502.032","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.032","url":null,"abstract":"<p><p>To analyze the characteristics of zooplankton community and the interspecific relationship of dominant species in Jinghe River Basin, we conducted a systematic water ecology survey in the autumn of 2021 (October) and the spring of 2022 (May). The results showed that a total of 71 genera and 150 species of zooplankton were identified in spring and autumn. The number of zooplankton species and the average density in autumn were smaller than that in spring. There were significant differences in community structure between the two seasons. There were 13 dominant species in both seasons, according to the criterion of dominance degree <i>Y</i>≥0.02. The results of ecologi-cal niche overlap (<i>O</i>_ik) analysis of dominant species showed that the autumn ecological niche overlap (0.455) was greater than the spring (0.381) because of poorer habitat conditions in autumn. Dominant species in autumn showed insignificant positive associations but significant positive associations in spring, indicating that the zooplankton community was more stable in spring. The results of point correlation coefficient (<i>Φ</i>) showed that the significant positive and negative associations in autumn (2.3) were less than those in spring (2.5), indicating positive succession in the zooplankton community in the Jinghe River Basin from autumn to spring.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"587-595"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144081094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cognitive dimensions, scales, and multidisciplinary coordinate systems in macroecosystem science.","authors":"Gui-Rui Yu, Fu-Bo Yu, Zong-Xu Yu, Jian-Xing Zhu, Tian-Xiang Hao","doi":"10.13287/j.1001-9332.202502.033","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.033","url":null,"abstract":"<p><p>Over the past century, ecology has evolved from classical or fundamental ecological studies into a new stage of ecosystem ecology or ecosystem science. This evolution has laid the theoretical groundwork for large-scale and global ecological research, fostering an integration of biology, geography, and environmental science, and promoting interdisciplinary collaboration between natural sciences, humanities, and socio-economics. Throughout the process of integration, ecology has absorbed concepts from other disciplines to form a unique scientific knowledge and concept system framework. However, for certain concepts originating from other disciplines, such as \"dimension\" and \"scale\", their application and role in ecological research remain inadequately defined and understood. We systematically reviewed the origins and definitions of concepts such as \"dimension\", \"scale\" and \"coordinate\", and discussed their ecological implications in macroecosystem science. Furthermore, we explored ecosystem functions and processes across multiple disciplinary dimensions, and defined the cognitive and measurement scales of macroecosystems in terms of time, space, and organization. Based on this analysis, we integrated traditional coordinate systems to develop a multi-dimensional coordinate framework for ecosystem science, aiming to provide a multi-dimensional conceptual framework for the construction of the theoretical system of ecosystem science.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"327-340"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144081098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal pattern and multi-scenario prediction of carbon sequestration capacity in the Changsha-Zhuzhou-Xiangtan Green Heart Area.","authors":"Xian-Zhao Liu, Zheng-Ying Luo, Yi-di Wang","doi":"10.13287/j.1001-9332.202502.022","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.022","url":null,"abstract":"<p><p>As an important ecological barrier, the Changsha-Zhuzhou-Xiangtan Green Heart Area is responsible for providing public ecological services for urban development. We used the FLUS-InVEST model to analyze the spatiotemporal patterns of land use, carbon storage, and carbon sink capacity in the Changsha-Zhuzhou-Xiangtan Green Heart Area from 2010 to 2020 based on multi-source data, and predicted carbon storage and carbon sequestration under different scenarios in 2030 and 2060. The results showed that land use pattern in the Green Heart Area had undergone significant changes during the study period. From 2010 to 2015, the area of forest, cultivated land, and grassland displayed a decrease, while the area of construction land, wetland, and water expanded. The land types with the largest decrease and increase in area were forest (loss of 36.25 km²) and construction land (increase of 53.05 km²), respectively. During 2015-2020, the land use decreased significantly in the following order: construction land (5.94 km²), grassland (6.53 km²), and wetland (4.62 km²). The land use increased significantly in the following order: cultivated land (12.94 km²), forest (3.07 km²), and water (1.08 km²). Both cultivated land and forest were at a net inflow state during this period. The carbon source areas in the Green Heart Area showed a downtrend from 2010 to 2020, decreasing from 259.44 km² in 2010-2015 to 233.32 km² in 2015-2020. The carbon balance and sink areas represented an increasing trend, increasing from 185.71 and 76.06 km² in 2010-2015 to 204.56 and 89.79 km² in 2015-2020, respectively. The overall carbon sequestration capacity exhibited a spatial pattern of firm in the east and west, weak in the central region, which was closely related to the changes in carbon storage in the Green Heart Area. In 2030 and 2060, the carbon storage and sink capacity of the Green Heart Area demonstrated an increasing trend under the S1 scenario (natural development), S2 scenario (farmland protection), and S3 scenario (ecological protection), indicating that ecological protection was the optimal development scenario. The carbon balance area was the most widely distributed in the three scenarios, with the carbon sink area mainly distributed in the eastern part of the Green Heart Area and along the Xiangjiang River and the carbon source area concentrated in the construction land east of the Xiangjiang River. Controlling construction land and strictly enforcing ecological protection regulations was a key pathway to enhance carbon sequestration capacity of the Green Heart Area.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"559-568"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144081099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Current situation, problems and suggestions of ancient and notable tree resources in Gansu Province, China.","authors":"Chun Qin, Jian-Cheng Ma, Jing-Jing Liu","doi":"10.13287/j.1001-9332.202502.035","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.035","url":null,"abstract":"<p><p>The diverse natural landscapes and rich historical-cultural heritage have bestowed an abundant resource of ancient and notable trees (ANT) in Gansu Province. Currently, the green economy of ANT has become a pivotal avenue for the construction of ecological civilization in Gansu Province. Based on literature synthesis, we reviewed the current status of ANT resources in Gansu Province. The ANT resources in Gansu are mainly distributed in rural areas and remote mountainous regions. Human activities, pests, and diseases are the main threats to the survival of ANT in residential areas and their surroundings, while climate change, particularly drought, is the primary threat to ANT in remote mountainous areas. The research and management of ANT differ across regions: residential areas and their surrounding areas mainly focus on maintenance and rejuvenation techniques, while remote mountainous areas pay more attention to the development of the scientific value of ANT while neglecting the research on the protection of ANT. There are several challenges, including low accuracy and efficiency in age determination, poor feasibility of management, underdeveloped legal frameworks, and low public engagement. To overcome those challenges, we recommended to promote ANT protection from the following four aspects. 1) Prioritizing the development of tree-ring determination and tree-ring-diameter regression estimation methods. Establishing professional institutions or teams for the ANT protection to enhance the precision and efficiency of age determination. 2) Investigating the population characteristics and biological mechanisms of tree aging of ANT. 3) Deepening our understanding of tree growth patterns of ancient trees at different ages to propose practical conservation measures, and 4) Refining relevant laws and regulations, and increasing public participation.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"605-613"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144081104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Litter, soil carbon and nitrogen fractions and enzyme activity in a typical broadleaved forest invaded by Moso bamboo.","authors":"Rong Sun, Ying-Zhi Zhao, Yong Chen, Xu-Li Zheng, Yan Zhou, Shuai Shao, Chen-Fei Liang, Hua Qin, Jun-Hui Chen","doi":"10.13287/j.1001-9332.202502.012","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.012","url":null,"abstract":"<p><p>We investigated the effects of bamboo invasion on the quantity and quality of litter input, soil carbon (C) and nitrogen (N) fractions and enzyme activities across an invasion sequence composed of evergreen broadleaved forest, mixed broadleaved and bamboo forest, and pure Moso bamboo forest. The results showed that stan-ding litter biomass, annual litter production, and the litter C content in mixed broadleaved and Moso bamboo forest was lower than the broadleaved forest by 49.0%, 7.3% and 8.2%, respectively, while that in pure Moso bamboo forest was lower than the broadleaved forest by 59.5%, 48.6%, and 18.7%. Bamboo invasion resulted in a significant decrease in soil organic C in broadleaved forest. Compared with broadleaved forest, soil organic C and total N in pure Moso bamboo forest were decreased by 52.1% and 15.0%. There was no significant difference between the mixed forest and broadleaved forest. Bamboo invasion significantly increased soil microbial biomass C and N, but decreased soil labile and recalcitrant C pools, as well as the proportion of recalcitrant C pool to soil organic C. The activities of soil phenol oxidase, peroxidase and β-glucosidase in mixed forest and pure bamboo forest were generally lower than those in broadleaved forest. The specific enzyme activities (per unit of soil organic C) in bamboo forest was significantly higher than that in the broadleaved forest and mixed forest. Soil organic C content and the recalcitrant C fraction were significantly positively correlated with annual litter production, standing litter biomass, and litter C content, but negatively correlated with the specific enzyme activities of phenol oxidase and peroxidase. Results of structural equation modeling showed that Moso bamboo invasion decreased recalcitrant C pool mainly by reducing litter input and enhancing the specific activities of enzymes involved in organic C degradation. In conclusion, Moso bamboo invasion reduced litter C input, increased the specific activities of soil enzymes involved in soil organic matter decomposition, which was not conducive to the accumulation of soil organic matter in broadleaved forest.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"489-496"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144080623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Post-fire changes in soil extracellular enzyme activities and their influencing factors in the permafrost region of the Da Xing'anling Mountains, Northeast China.","authors":"Yang Shen, Xiao-Ying Li, Hui-Ying Cai, Tao Xu, Jing-Tao Li, Kui Chen","doi":"10.13287/j.1001-9332.202502.019","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.019","url":null,"abstract":"<p><p>Understanding the changes in soil enzyme activities and the influencing factors after forest fire distur-bances can help assess and predict the impacts of climate warming on permafrost ecosystems. We analyzed the acti-vities of extracellular enzyme, including urease (UR), acid phosphatase (AP), acetyl-glucosidase (NAG), β-glucosidase (βG), and leucine aminopeptidase (LAP), in soils (0-60 cm depth) across unburned, lightly burned and severely burned sites within the 2015 burned area in the northern Da Xing'anling Monntains. The results showed that fire intensity, soil depth, and soil physicochemical properties significantly influenced extracellular enzyme activities. Compared to that in unburned site, the activities of UR, AP, βG, and LAP increased by 59.8%-241.7%, while NAG decreased by 35.5% at lightly burned site. The activities of all soil enzymes increased, with the magnitidues ranging from 26.0% to 206.0% at severely burned site. Soil enzyme activities gra-dually decreased with increasing soil depth. Redundancy analysis identified soil temperature (ST), total phosphorus (TP), C:P, C:N, soil depth and soil water content (SWC) as important influencing factors of soil enzyme activities, contributing 70.9%, 12.2%, 4.7%, 3.6%, 2.9%, and 1.9%, respectively. Soil enzyme activities were signifi-cantly positively correlated with ST, TP, C:P, C:N, and SWC, but significantly negatively correlated with soil depth. Forest fires and the resultant changes in soil physicochemical properties jointly affected soil extracellular enzyme activities, with the effects intensifying with increasing fire intensity.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"497-203"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144080711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prediction of suitable overwintering habitat for <i>Grus grus</i> and key factors influencing population distribution in China.","authors":"Zhong-Shan Yan, Ming-Qin Shao, Jian-Ying Wang","doi":"10.13287/j.1001-9332.202502.024","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.024","url":null,"abstract":"<p><p>Common cranes (<i>Grus grus</i>) are large wading birds widely distributed across China, with populations showing an increasing trend. Identifying the key factors influencing the suitable overwintering habitats and population distribution of <i>G</i>. <i>grus</i> is essential for guiding species conservation. We employed the MaxEnt model to predict the suitable overwintering habitats of <i>G</i>. <i>grus</i> in China, using 300 distribution points from the overwintering period and incorporating 26 ecological factors, including climate, topography, land use, normalized difference vegetation index, and human disturbance. The results showed that the primary factors influencing the selection of overwintering habitats for the eastern population of <i>G</i>. <i>grus</i> included elevation, distance to water sources, precipitation of the driest quarter, and temperature seasonality. For the central population, distance to water sources, precipitation of the coldest quarter, elevation, mean temperature of the coldest quarter, and distance to villages were the key factors. Isothermality, distance to villages, elevation, and distance to water sources were the key factors influencing the western population. The area of highly suitable overwintering habitats for <i>G</i>. <i>grus</i> in eastern China was 33730.91 km², primarily located in the North China Plain and the wetlands of the middle and lower Yangtze River. In central China, the area was 19336.81 km², mainly found in the wetlands of the Yellow River in Shanxi, Shaanxi, and Henan. In western China, the area was 52243.06 km², predominantly distributed in the wetlands and cropland-mosaic areas of southern Xizang, northern Yunnan, and western Guizhou. Suitable habitats for <i>G</i>. <i>grus</i> were found across nearly all of China, with the species exhibiting adaptability to harsh environments, such as high-altitude and high-latitude areas. Our results could provide guidance for the conservation and management of <i>G</i>. <i>grus</i>.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"578-586"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144080987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response of tree-ring images in different bands to climatic factors.","authors":"Qi-Hua Su, Yong-Hong Zheng, Zheng-Sheng Hu, Hui-Hui Liao, Cheng-Yu Lu","doi":"10.13287/j.1001-9332.202502.009","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202502.009","url":null,"abstract":"<p><p>To deeply explore the climate signals contained in tree rings, we extracted red, green, and blue light intensities from the tree rings of <i>Abies fargesii</i> in the Jinhouling (altitude: 2564 m) and Taiziya (altitude: 2494 m) areas of Shennongjia, using the CooRecorder software. With an age-dependent spline, we fitted the growth trends, established chronologies, and analyzed the correlation between tree ring chronology and climate factors from 1953 to 2020. The results showed that the red, green, and blue light intensities of earlywood of trees from Jinhouling showed a significant positive correlation with mean maximum temperature, mean temperature, and mean minimum temperature in June. In Taiziya, the red, green, and blue intensities of earlywood was significantly positively correlated with the mean maximum temperature in June and significantly negatively correlated with March precipitation. In Jinhouling, latewood red, green, and blue light intensities showed significant positive correlation with mean maximum temperature of June, July and August, as well as with mean temperature and mean minimum temperature in July and August, and significant negative correlations with July precipitation. In Taiziya, latewood red, green and blue light intensities were significantly positively correlated with mean maximum temperature, mean temperature, and mean minimum temperature in August and negatively correlated with August precipitation. The responses of the red, green, and blue bands of tree rings to climate factors often showed a regular trend of variation with wavelength changes, but the trends varied across different bands.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 2","pages":"403-410"},"PeriodicalIF":0.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144081022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Population characteristics of a rare cladocerans, <i>Bunops scutifrons</i>.","authors":"Guo-Zhu Chen","doi":"10.13287/j.1001-9332.202501.032","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202501.032","url":null,"abstract":"&lt;p&gt;&lt;p&gt;Rare species may exhibit some characteristics, such as a narrow distribution area and a specialization of habitat utilization. These characteristics may provide crucial information about the underlying mechanisms of species endangerment. &lt;i&gt;Bunops scutfrons&lt;/i&gt;, a rare cladocera, has received more and more attention due to its rarity. Understanding the causes of its rarity could advance ecological theory. This species has only been recorded in four samples in China, with limited taxonomic descriptions. Its key biological and ecological characteristics remain largely unknown. Live specimens of &lt;i&gt;B. scutfrons&lt;/i&gt; were firstly collected from the Dianchi Lake Basin during a systematic clado-ceran survey in 2022. Through successful propagation, sufficient individuals were available, allowing for an investigation into population structure, reproductive capacity, and population dynamics of this species. I carried out observations in 2022 and 2023. &lt;i&gt;B. scutfrons&lt;/i&gt; was a small cladoceran (body length: 0.30-1.15 mm), with sexual maturation at a small size (0.52 mm). Notably, no male individuals were detected in the population. In 2022, the fecundity of the outdoor population (summer eggs) was (2.2±1.4) eggs·ind&lt;sup&gt;-1&lt;/sup&gt; (&lt;i&gt;n&lt;/i&gt;=334, max=8 eggs·ind&lt;sup&gt;-1&lt;/sup&gt;), which increased to (4.8±2.8) eggs·ind&lt;sup&gt;-1&lt;/sup&gt;(&lt;i&gt;n&lt;/i&gt;=94, max=13 eggs·ind&lt;sup&gt;-1&lt;/sup&gt;) in 2023. During the reproduction of winter eggs, two eggs were produced per ephippium. In life table experiment, individuals were fed with mixed algal solution (&lt;i&gt;Chlorella&lt;/i&gt; spp.). The maximum number of reproductive instars in the first (F&lt;sub&gt;1&lt;/sub&gt;) and second (F&lt;sub&gt;2&lt;/sub&gt;) generation was 8 and 7, respectively. The total reproductive rate was 30.3 eggs·ind&lt;sup&gt;-1&lt;/sup&gt; and 9.4 eggs·ind&lt;sup&gt;-1&lt;/sup&gt;, respectively, with maximum lifespans of 21 and 16 days, and intrinsic growth rates of 0.37 and 0.36. When cultured in a mud slurry medium, the maximum reproductive instars for both the F&lt;sub&gt;1&lt;/sub&gt; and F&lt;sub&gt;2&lt;/sub&gt; generations was 8, with a total reproductive rate of 40.3 and 36.1 eggs·ind&lt;sup&gt;-1&lt;/sup&gt;, respectively. The lifespan extended to 28 and 27 days, with intrinsic growth rates of 0.31 and 0.30, respectively. Under suitable conditions, the population of &lt;i&gt;B. scutfrons&lt;/i&gt; grew rapidly, with an instantaneous growth rate of 0.39 per day. By the 10th day, population size increased 50-fold, reaching a relative density of 510 ind·L&lt;sup&gt;-1&lt;/sup&gt;, and the population entered a plateau phase. In the natural environment, however, the relative abundance remained extremely low. In 2022, the population disappeared during the dry season, while in 2023, it vanished completely from the observation area during the flood season. These findings suggested that &lt;i&gt;B. scutfrons&lt;/i&gt; exhibits a relatively long lifespan, high reproductive capacity, and strong potential for population growth under favorable conditions. Compared to many common species, &lt;i&gt;B. scutfrons&lt;/i&gt; does not show significant disa","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 1","pages":"293-302"},"PeriodicalIF":0.0,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144080582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Factors influencing and diurnal characteristics of stem sap flow of various diameter classes in <i>Castanopsis carlesii</i> in the central Yunnan alpine region, China.","authors":"Xue-Ming Qiu, Ke-Qin Wang, Xian-Yue He, Zhu-Yu Li, Guang-He Zhang, Yang-Yi Zhao","doi":"10.13287/j.1001-9332.202501.005","DOIUrl":"https://doi.org/10.13287/j.1001-9332.202501.005","url":null,"abstract":"<p><p>We examined the diurnal variation characteristics of stem sap flow of <i>Castanopsis carlesii</i>, a natural evergreen broad-leaved tree species occurring in the Mopanshan Forest Park in central Yunnan. Environmental factors were recorded with a small automatic weather station. The results showed that the diurnal variation of the sap flow rate of trees from large (35-45 cm), medium (25-35 cm) and small (15-25 cm) diameter classes showed obvious single-peak curves of 'day high and night low'. The sap flow rate in the first half of the night was slightly higher than that in the second half. The change in sap flow rate on the daily scale showed a trend characterized by an initial increase followed by a decrease. The overall change range was proportional to the size of the diameter class. The sizes of sap flow rates across the diameter classes were in the order of middle diameter class > large diameter class > small diameter class. The daily sap flow rate across diameter classes ranged from 19.21 to 72.27 mL·cm^-2·d^-1, while the nighttime sap flow rate ranged from 0.97 to 6.04 mL·cm^-2·d^-1. The contribution rate of nighttime sap flow to the daily sap flow ranged between 2.6% and 21.5%. The contribution rate of nighttime sap flow in the diameter classes was in the order of small diameter class > middle diameter class > large diameter class. The sap flow rate in <i>C. carlesii</i> was significantly correlated with solar radiation, saturated water vapour pressure deficit, air temperature, relative humidity, and wind speed. The main factors influencing daytime sap flow rate were solar radiation, saturated water vapour pressure deficit, air temperature, relative humidity, and wind speed. The main factor influencing nighttime sap flow rate was air temperature. In the subalpine habitats of Southwest China characterized by low temperatures and high humidity, the sap flow of <i>C.</i> <i>carlesii</i> exhibited pronounced diurnal variation, with significant differences in the factors influencing sap flow between day and night. When estimating the total daily transpiration water consumption of <i>C.</i> <i>carlesii</i>, it is essential to consider the contribution of nighttime sap flow.</p>","PeriodicalId":35942,"journal":{"name":"应用生态学报","volume":"36 1","pages":"21-30"},"PeriodicalIF":0.0,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144080318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}