Rangeland Ecology & Management最新文献

{"title":"Effects of Nocturnal Grazing Behavior and Stock Density on Cattle Dung in Sloped Rotational Grazing","authors":"Naohisa Nakashima ,&nbsp;Kensuke Kawamura ,&nbsp;Masahiro Hirata ,&nbsp;Toshimi Muneoka ,&nbsp;Masato Kimura ,&nbsp;Moeka Shinkai","doi":"10.1016/j.rama.2024.11.006","DOIUrl":"10.1016/j.rama.2024.11.006","url":null,"abstract":"<div><div>In this study, we investigated the effects of nocturnal variation in grazing behavior and stock density on the distribution of cattle dung in a sloped rotational grazing system in Japan. The specific objectives were to determine the influence of watering sites on dung distribution at night and the relationship between stock density and dung distribution. The study was conducted on a 2.56-ha steeply sloped pasture that was divided into four sub-paddocks for rotational grazing. Drone imagery and the YOLO deep learning algorithm were used to automate the mapping of more than 400 cattle dung pats per grazing session, with a mean average precision of 0.75. The YOLO algorithm demonstrated high accuracy in identifying dung that was up to 4 days old. Our analyses revealed that the distance to a watering site influenced fecal distribution during the day, but had a weaker and insignificant effect at night. With low-density grazing, dung pats showed a clumped distribution across the entire pasture, whereas at higher stock density the distribution approached randomness. The formation of four dung hotspots was observed in the pasture, although these spots were not consistently used throughout subsequent grazing periods. The cattle tended to migrate from more elevated foraging areas to more level grazing areas for rest, resulting in a loose connection between foraging and resting sites, and this behavior may have a bearing on the lack of successive utilization of these fecal hotspots. Subsequent research must examine whether these patterns persist across seasonal variations and different grazing lands. Despite this need for validation, our findings can provide insights for guiding sustainable nutrient redistribution and grassland management on sloped terrain through the management of stock density and grazing schedules.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"99 ","pages":"Pages 18-25"},"PeriodicalIF":2.4,"publicationDate":"2025-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143128935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Plant Production Forecasts Across Geographical Sites and Ecological States in Sagebrush-Steppe Plant Communities","authors":"Merilynn C. Schantz ,&nbsp;Stuart P. Hardegree ,&nbsp;Roger L. Sheley ,&nbsp;Jon D. Bates ,&nbsp;Jeremy J. James ,&nbsp;John T. Abatzoglou ,&nbsp;Kirk W. Davies","doi":"10.1016/j.rama.2024.07.014","DOIUrl":"10.1016/j.rama.2024.07.014","url":null,"abstract":"<div><div>Climate is the principal driver of plant production across all rangeland ecosystems. Monthly or seasonal forecasts of rangeland plant production could provide valuable management information pertaining to livestock stocking rates, restoration planning, wildfire fuel loads, and wildlife management. In the sagebrush steppe ecoregion, plant production is dependent upon climate but also varies by geographic location and the ecological state or dominant plant community. In this study, we used retrospective seasonal climate forecasts and plant production models to determine the utility of monthly or seasonal forecasting (with up to 7-month lead times) across both geographical sites and ecological states. This study was conducted in 45 intact late-seral sagebrush steppe sites over a 10-year period across a 50,000 km² area in southeastern Oregon. Research sites were sorted into five geographical sites and into five ecological states. The objectives of this study were to (1) model plant functional group responses to actual and forecasted climate across time and space; (2) determine plant production forecast skill for lead times of up to 7 months; and (3) differentiate plant production model and forecast skill among both geographical sites and ecological states. We found that plant production models and forecasts were able to identify key functional group responses to precipitation and temperature inputs. We also determined that climate and plant production forecasts could be used to produce significant monthly plant production forecasts for lead-times of up to 7-months for all site, state, and plant functional groupings. We also determined that forecasts of total plant production by ecological state were significantly better than forecasts based on geographical sites. Forecasting by ecological state could lead to better rangeland management decisions as it matches management inputs with inherent site conditions.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 609-619"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Virtual Fences Successfully Contain Cattle Over a Wide Range of Stocking Densities and at Stubble Heights Below Common Riparian Management Targets","authors":"Nathan P. Jero ,&nbsp;Paul J. Meiman ,&nbsp;Tamzen K. Stringham ,&nbsp;Mozart A. Fonseca ,&nbsp;Todd Parker","doi":"10.1016/j.rama.2024.11.002","DOIUrl":"10.1016/j.rama.2024.11.002","url":null,"abstract":"<div><div>Virtual fencing is an emerging animal management technology that uses auditory cues followed by a mild electrical cue instead of physical barriers to contain animals. Virtual fencing has long been conceptualized as a tool to help land managers achieve livestock production and land management goals, yet little research has focused on factors that influence virtual fence performance. We evaluated the effects of stocking density, the quantity of forage inside the paddock, and differences between forage quantities inside and outside the paddock on the effectiveness of a commercially available virtual fencing system. We tested the virtual fencing system at stocking densities ranging from 2 to 8 animals ha^–1 and measured stubble height inside and outside the paddocks as a proxy for forage quantity. Predictability and controllability of the electrical cue have been identified as key animal welfare considerations associated with virtual fences, but have not been specifically defined, quantified, and analyzed. Therefore, we quantified predictability and controllability and evaluated the extent to which they were affected by stocking density, stubble height, and the difference in stubble heights inside and outside the paddock. We found that neither stocking density, forage quantity, nor the difference in forage quantity inside and outside the paddock influenced the effectiveness of virtual fences or the predictability and controllability of the electrical cue. This implies that virtual fencing systems are likely to be reliable tools for livestock management in productive settings and for stocking densities up to 8 animals ha^–1 even when stubble heights are at or below common management targets for riparian plant communities.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 539-549"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Varieties of Plants α-Diversity and Biomass in Desert Grasslands Under the Precipitation Change and Climate Warming","authors":"Yi Zhang ,&nbsp;Jian-Ping Li ,&nbsp;Ying-Zhong Xie ,&nbsp;Xiao-Yan Li ,&nbsp;Xv Luo ,&nbsp;Xvmei Huang ,&nbsp;Yu-Tao Wang ,&nbsp;Jianfei Yv ,&nbsp;Xiaoqian Liang","doi":"10.1016/j.rama.2024.10.008","DOIUrl":"10.1016/j.rama.2024.10.008","url":null,"abstract":"<div><div>Plants <em>α-</em>diversity and biomass have a significant impact on global climate and environmental changes. The fluctuation of temperature and precipitation caused by climate change is a driving force for the dynamic change of plants <em>α-</em>diversity and biomass. Therefore, our study was conducted in the desert grassland of Ningxia, China (E 107.285, N 37.763), and involved an experiment with five levels of annual precipitation (33% [R33], 66% [R66], 100% [CK], 133% [R133], and 166% [R166]) and two temperature levels (inside and outside the open-top chamber [OTC]). Our objective was to determine how plants <em>α-</em>diversity in desert grasslands respond to changes in precipitation and warming. Our study suggests that aboveground living biomass (ALB) and root biomass (RB) of plants increased with precipitation increasing. Plants diversity, richness and evenness were improved from 0.1 to 0.2 under warming. TR33, TR66, TRCK, TR133, and TR166 all decreased plants <em>α-</em>diversity under the interaction of precipitation and warming, with TR33 and TR66 having a stronger effect on the correlation between community <em>α</em>-diversity indices than the other treatments. TR133 and TR166 increased ALB by nearly 20g/m² but decreased RB by nearly 15g/m². Our findings provide a reliable theoretical basis for the formulation of reasonable response strategies for desert steppe ecosystems.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 508-517"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Escaping the Browse Trap: Patterns of Natural Blue Oak Regeneration in Grazed Landscapes","authors":"Alex Palmerlee ,&nbsp;Kurt Vaughn ,&nbsp;Truman Young","doi":"10.1016/j.rama.2024.11.005","DOIUrl":"10.1016/j.rama.2024.11.005","url":null,"abstract":"<div><div>Blue oak, <em>Quercus douglasii</em>, are vital components of California's foothill ecosystems. Widespread oak recruitment failure has led to considerable restoration efforts, with mixed success. Natural regeneration is hindered at least in part by extensive cattle grazing, resulting in a troubling recruitment gap in many natural populations. Despite this, certain areas within ranches exhibit natural oak recruitment, suggesting the existence of conditions compatible with both grazing and oak regeneration. Understanding these conditions is essential for developing sustainable conservation and rangeland management practices. We conducted a comprehensive survey of 24 active cattle ranches across Northern California to identify factors influencing oak recruitment and to attempt to propose a range of optimal grazing pressures for natural blue oak recruitment. We found that rocky refugia with reduced grazing pressure were associated with greater oak recruitment. Low cattle presence, rockiness, low herbaceous cover, and high shade all significantly predicted oak recruitment sites. Tree-ring analysis revealed that saplings exhibited extremely variable growth rates, but slower under high grazing pressure, indicating the presence of a “browse trap,” from which saplings struggle to escape cattle browse. Achieving sustainable oak regeneration may require at least temporarily reducing grazing pressure or implementing other grazing strategies to facilitate oak recruitment and enable saplings to pass through the browse trap. Our results underscore the critical role of landscape conditions and cattle management in supporting oak recruitment refugia. These findings have practical implications for land management, highlighting the importance of balancing grazing practices with conservation efforts to ensure the long-term health and biodiversity of oak woodlands in California's Central Valley foothills.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 561-567"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Digestion on Germination of Native Grasses of the Southern Great Plains","authors":"Shaelyn T. Rainey,&nbsp;Caitlyn E. Cooper-Norris,&nbsp;Katherine A. Pearson,&nbsp;Aaron B. Norris","doi":"10.1016/j.rama.2024.09.009","DOIUrl":"10.1016/j.rama.2024.09.009","url":null,"abstract":"<div><div>Rehabilitating rangelands through native plantings can be an expensive and risky endeavor that requires extended time periods with low success rates. Economical methods of seed dispersal through ruminant ingestion have been tested unsuccessfully in the Northern Great Plains, but this approach has not been evaluated in depth in the Southern High Plains. Scarification during digestive processes could potentially improve the germinability of native grass species possessing low germination rates and assist in approving plant establishment. To determine how various digestive phases affect seed germinability, we evaluated how simulated digestion affected germination parameters for sideoats grama (<em>Bouteloua curtipendula</em> [Michx.] Torr.), buffalograss (<em>Bouteloua dactyloides</em> [Nutt.] J.T. Columbus), blue grama (<em>Bouteloua gracilis</em> [Willd. ex Kunth] Lag. ex Griffiths), silver bluestem (<em>Bothriochloa laguroides</em> [DC.] Herter), green sprangletop (<em>Leptochloa dubia</em> [Kunth] Nees), and plains bristlegrass (<em>Setaria leucopila</em> [Scribn. &amp; Merr.] K. Schum<em>.</em>). Seeds were incubated in either 1) rumen fluid for 48 h, 2) acid-pepsin solution for 2 h, or 3) rumen fluid for 48 h, followed by acid-pepsin solution for 2 h. Statistical procedures were performed for all germination parameters using general linear mixed models. Only buffalograss demonstrated the ability to survive the full digestive process, having greater germination than all other species exposed to the rumen fermentation and acid-pepsin treatment (<em>P</em> ≤ 0.05). Acid-pepsin treatment maintained or increased germination relative to the control for all species (<em>P</em> ≤ 0.001). Depending on the species, digestive treatments altered the germination profile relative to the nondigested control. Results from this study indicate that seed dispersal via ruminants is not an effective option for most of the species tested, with only buffalograss being a potential candidate. In contrast, endozoochory by monogastric species may increase the success of seed establishment; however, this could support the migration of noxious or invasive species that can greatly alter vegetative communities.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 568-575"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153790","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nutritional potential of native shrub species for cattle feeding in northeastern Peru","authors":"Lorenzo Culqui ,&nbsp;Ángel Fernando Huaman-Pilco ,&nbsp;Lily Juarez-Contreras ,&nbsp;Carmen N. Vigo ,&nbsp;Malluri Goñas ,&nbsp;Elí Pariente-Mondragón ,&nbsp;Jorge L. Maicelo-Quintana ,&nbsp;Manuel Oliva-Cruz","doi":"10.1016/j.rama.2024.11.004","DOIUrl":"10.1016/j.rama.2024.11.004","url":null,"abstract":"<div><div>In Peru, natural grasses and shrubs are the primary sources of cattle feed; however, the nutritional quality of shrub species used as forage is generally still being determined. Therefore, this research aimed to identify the main native shrub species and the nutritional potential of each species for cattle feeding in Amazonas, Peru. The shrubs were selected through surveys of cattle farmers in the region, and each species' bromatological characteristics were determined. In fact, twenty-one species from 14 families were identified as the main shrubs used for cattle feed. Among them, the Asteraceae family reported the highest number of species (6). The percentage of total protein was higher than 18% in 10 plant species, while the percentage of digestibility exceeded 60% in 19 species. Principal component analysis (PCA) revealed that the first two dimensions explained 60.7% of the total variability, with digestibility, neutral detergent fiber, acid detergent fiber, and protein being the most influential factors. In addition, cluster analysis grouped the species into four groups differentiated by their nutritional characteristics, providing a solid basis for selecting forage species according to their qualities. <em>Myriocarpa stipitata</em> (Urticaceae) presented the highest percentages of total protein (30.3%) and digestibility (89.2%), being the shrub species with the greatest potential for cattle feeding in northeastern Peru.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 600-608"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Can Changing Livestock Structure Serve as a Climate Adaptation Strategy? Evidence From the Mongolian Plateau","authors":"Zhipeng Huang ,&nbsp;Yi Huang ,&nbsp;Yan Zhang ,&nbsp;Jingqi Wang ,&nbsp;Gang Xu","doi":"10.1016/j.rama.2024.10.005","DOIUrl":"10.1016/j.rama.2024.10.005","url":null,"abstract":"<div><div>The vulnerability of grassland ecosystems in the Mongolian Plateau has increased due to climate change and human intervention, and thus herdsmen must adopt additional livelihood adaptation strategies. In this study, we determined the impact of the livestock structure, that is, the proportion of sheep and goats in the livestock population, on grassland coverage on the Mongolian Plateau (Mongolia and the Nei Mongolia Autonomous Region of China). By applying a fixed effect model and mediating effects model to a unique combination of statistical and remote sensing data for 20 border provinces/banners from 2007 to 2016, we found that a higher proportion of sheep and goats led to grassland degradation, and the grassland type (i.e., whether among the top 50% in terms of the Normalized Difference Vegetation Index) could alleviate the negative impact of a high proportion of sheep or goats on grassland coverage. The results obtained by the mediating effects model showed that the primary industry gross domestic product (GDP) had a masking effect, where it could mitigate the negative influence of sheep or goats on grassland coverage. Regional heterogeneous analysis did not provide significant results for Mongolia due to its relatively stable livestock structure, but the livestock structure in Nei Mongolia had a greater negative impact on grassland coverage, thereby further indicating that a decrease in the proportion of sheep and goats had a greater ecological benefit.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 518-529"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predictors of ranchers’ Protection Behaviors in the Use of Pastures Through Protection Motivation Theory","authors":"Mahnaz Barani Bayranvand ,&nbsp;Mehdi Rahimian ,&nbsp;Moslem Savari ,&nbsp;Homa Molavi ,&nbsp;Rezvan Ghanbari Movahed","doi":"10.1016/j.rama.2024.11.001","DOIUrl":"10.1016/j.rama.2024.11.001","url":null,"abstract":"<div><div>The food security of many countries depends on effective pasture management. The behavior of ranchers, as direct users of pastures, is considered a key factor in pasture conservation. The aim of this research is to analyze the conservation behavior of Iranian ranchers in relation to pasture exploitation using Protection Motivation Theory (PMT). The results indicate that the expected hypotheses were confirmed, except for the effect of the response cost variable on protective behavior. The variables of perceived vulnerability, perceived severity, response effectiveness, and self-efficacy accounted for 63.9% of pastoralists’ protective behavior toward pasture exploitation. This research demonstrates that PMT is a valuable tool for investigating the conservation behavior of Iranian ranchers. One of the key outcomes of this research is the development of recommendations for policymakers to promote pasture conservation among ranchers.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 576-587"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal Climate Effects in Sagebrush-Steppe Plant Community Production","authors":"Merilynn C. Schantz ,&nbsp;Stuart P. Hardegree ,&nbsp;Jon D. Bates ,&nbsp;Jeremy J. James ,&nbsp;Kirk W. Davies ,&nbsp;Roger L. Sheley","doi":"10.1016/j.rama.2024.08.028","DOIUrl":"10.1016/j.rama.2024.08.028","url":null,"abstract":"<div><div>Accurate models and forecasts of plant production are a critical need of stakeholders across the Great Basin for making decisions about seasonal livestock management in a region that is increasingly impacted by wildfires, invasive species and yearly variability in seasonal climate. High quality and spatiotemporally complete gridded climate forecasts are now available through the Climate Prediction Center (CPC) and North American Multi-Model Ensemble (NMME) programs, but these forecasts are limited to monthly precipitation and temperature parameters. A necessary first step to creating plant production forecasts is to quantify the spatiotemporal relationships between plant production and these basic climate inputs. The objective of this study was to quantify how seasonal precipitation and temperature affected plant production among the plant species <em>Poa secunda</em> and the functional groups of perennial grasses, perennial forbs, annual grasses, and annual forbs within five ecological states in the Great Basin Sagebrush Steppe over a 10-year period. In general, cooler and wetter spring conditions and cooler summer temperatures in the preceding year were the strongest drivers of plant production across most ecological states and within plant functional groups. These differences were, however, dependent on the given ecological state and plant functional group. These findings indicate that plant production forecasting is feasible for this ecosystem during the growing season when using the climate metrics provided by the CPC and NMME program.</div></div>","PeriodicalId":49634,"journal":{"name":"Rangeland Ecology & Management","volume":"98 ","pages":"Pages 620-628"},"PeriodicalIF":2.4,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143153921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}