干旱区研究最新文献

{"title":"Study on Plant Species Composition and Richness of the Mountain Coniferous Forests in Xinjiang","authors":"Li Li-ping","doi":"10.3724/sp.j.1148.2011.00040","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00040","url":null,"abstract":"After carrying out the survey of 122 plots at 11 locations in the Altay Mountains (Altay),Kunlun Mountains (KL in abbreviation,the same below),and northern and southern slopes of the Tianshan Mountains (NT and ST respectively) in Xinjiang,it is found that the plant species richness of coniferous forests in Altay is significantly higher than that in ST and KL; plant species richness of Picea schrenkiana forests is significantly lower than that of P. obovata forests. According to the Sorensen Index,the plant composition in ST and KL is similar,and it is also similar in Altay and NT; the plant composition in Larix sibirica forests and Picea obovata forests are similar,but that in Juniperus centrasiatica and J. jarkendensis forests is quite different from that in Pinus sibirica and Abies sibirica forests,L. sibirica forests and Picea obovata forests. Species richness decreases significantly with the increase of altitude and mean annual temperature (MAT) but increases significantly with the increase of latitudes in whole Xinjiang. Species richness decreases with the increase of total basal area (TBA) in Altay and KL. According to the GLM (General Linear Model),aspect of plots (ASP) affects significantly the plant species richness in whole Xinjiang. Forest type and TBA also affects significantly the plant species richness in north Xinjiang. While in south Xinjiang,the plant species richness is significantly affected by annual precipitation (AP),slope position (POS) and TBA.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69830632","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":"Analysis on Soil Moisture Content in the Middle Reaches of the Yellow River","authors":"Gao Yuan","doi":"10.3724/sp.j.1148.2011.00085","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00085","url":null,"abstract":"In this paper,the data of soil moisture content in the middle reaches of the Yellow River during the period of 1981-2002 were analyzed to find the horizontal and vertical distribution laws. Characteristics of interannual and inter-decadal change of soil moisture content were also analyzed. The results reveal that,horizontally,soil moisture content was approximately higher in the central part than that in the southwestern and southeastern parts of the study area. Vertical distribution of soil moisture content changed seasonally. Soil moisture content was sharply decreased from early spring to May,especially in topsoil,the time when soil became the driest was earlier for 3 ten-day periods than that in soil layer of 50-100 cm,and the upper soil layer was drier than the lower one. Moisture content in topsoil was sharply increased in rainy season,and it was higher than that in lower layer. Holistically,soil moisture content was in a decrease trend,and there was a 5-6-year periodic change in the study area during the period of 1981-1996. There was an abrupt change of soil moisture content around 1991 in the central-southern part. Soil moisture content and its interannual change extent were high before 1991,and then soil became drier and the interannual change extent was lower. The change of soil moisture content was the most remarkable in the central-southern part of the study area.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69830705","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":"Osmolyte Accumulation of Armeniaca vulgaris under Continuous Drought Stress","authors":"W. Lei","doi":"10.3724/sp.j.1148.2011.00126","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00126","url":null,"abstract":"In this paper,the osmotic regulation characteristics of 4 types of Armeniaca vulgaris seedlings under 80-day drought stress were studied. Drought stress treatment was applied to test the osmotic regulation characteristics of biennial seedlings of Armeniaca vulgaris f. aurantica L.,Wang et D. F. Cui and Armeniaca vulgaris f. glyeyosma L.,Wang et D. F. Cui,and the relative soil moisture content at depth of 15-20 cm,relative water content in leaves of A. vulgaris and the contents of Na+,K+,soluble protein,soluble sugar and proline were measured every 20 days. The results show that the relative soil moisture content at depth of 15-20 cm was decreased to slight drought stress (54%) after the seedlings were irrigated for 20 days,the relative water content in leaves was maintained higher than 80% except that in leaves of sweet kernel No.2. Under slight drought stress,K+ accumulation occurred in leaves of most wild apricots. Na+ accumulation occurred in leaves of all four types of wild apricot seedlings when the relative soil moisture content was decreased to the severe drought stress (47%-18%) after the seedlings were irrigated for 40-80 days. Soluble protein was relatively sensitive to drought stress,it was accumulated under slight to moderate drought stress,and such accumulation was possibly related to the drought-resistant capability of seedlings. Soluble sugar was also accumulated when drought stress was severer. Proline content was sharply increased under severe drought stress after the seedlings were irrigated for 60 days,but it was too low to contribute to osmotic regulation under hyperosmotic conditions,which suggests that the Proline accumulation is a symptom that the cells were injured under such drought stress.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69831103","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":"Field Experimental Study on Infiltration in Seasonal River Channels","authors":"Hao Peng","doi":"10.3724/sp.j.1148.2011.00074","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00074","url":null,"abstract":"In order to find the leaking laws of seasonal Dagu River in Shandong Province,some typical test sited were established in the upper and middle reaches of the Dagu River,and the field infiltration experiments were conduced based on the theory of water movement in vadose zone. Capacities of infiltration in riverbed in different vadose zones were studied. The results show that the infiltration process in the dry riverbed could be divided into two stages,i.e. the unstable infiltration and stable infiltration; the infiltration in the riverbed was affected by the hydraulic properties of vadose zone,and the infiltration rate in the upper reaches was higher than that in the middle reaches. The stable infiltration rates in the upper and middle reaches were 0.028 and 0.023 cm/s respectively. The process of unstable infiltration varied in a range of 1.5-2.0 hours,the proportion of infiltration was low in the total leakage,and it was gradually decreased with the time. Therefore,it is feasible to calculate the total leakage by using the stable infiltration rate in riverbed in flood season.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69830909","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 Evolution of Extreme Precipitation Events in Shaanxi Province during the Period 1961-2007","authors":"Hui Ying","doi":"10.3724/sp.j.1148.2011.00151","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00151","url":null,"abstract":"In this paper,the spatiotemporal change of annual extreme precipitation events is analyzed using the daily precipitation data observed by 78 meteorological stations in Shaanxi Province during the period 1961-2009. The results show that the threshold of extreme intensity precipitation varied in a range of 18.7-9.5 mm/d,and it decreased northward. The extreme precipitation events in the province occurred mainly in rainy season from May to September,especially during the period from July to September,their duration was mostly for one day,the extreme precipitation events with 2-day duration occurred mainly in the central-southern part of south Shaanxi Province,and those with 3-day duration were occasional. The change trend of annual extreme precipitation events in the province was not significant in recent 49 years,but the extreme precipitation events increased in summer. The EOF results reveal that there were 2 main spatial distribution patterns of frequency of extreme precipitation events in the province. The first one (EOF1) was that the high or low frequency of extreme precipitation events was accordant in whole province,and there were 22-year and quasi-8-year periodic changes. The second one (EOF2) was that the frequency of extreme precipitation events in the southeastern part was opposite to that in the northwestern part,and there were the 12-14-year and 2-3-year periodic changes.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69831133","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":"Study on Relationship between Height and DBH of Mountain Coniferous Forests in Xinjiang","authors":"Li Li-ping","doi":"10.3724/sp.j.1148.2011.00047","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00047","url":null,"abstract":"Growth of trees includes two dimensions,i.e. diameter and height. The height-diameter relationship is affected by climatic and topographic conditions as well as species properties. In this paper,the relationship between stem diameter at breast height (DBH) and stem height (H) of coniferous forests is analyzed based on 120 sample plots investigated from 11 locations in the Altay Mountains (Altay),Kunlun Mountains (KL in abbreviation,the same below),and northern and southern slopes of the Tianshan Mountains (NT and ST respectively) in Xinjiang. The potential heights (H*) of trees in each plot were estimated. The results show that the taper of coniferous forests in KL,calculated with DBH/H,is higher than that in other regions,and the potential height in KL is lower than that in Altay and NT. For different forests,the taper of Pinus sibirica,Abies sibirica and Picea obovata forests is lower than that of Larix sibirica and Juniperus forests. The taper of Picea schrenkiana forests is lower than that of Juniperus forests but higher than that of Picea obovata forests. The H* of Juniperus forests is lower than that of other forests. Taper increases with the increase of altitude but decreases with the increase of AP in whole Xinjiang. For different regions,taper increases but H* decreases with the increase of altitude in Altay and NT,but there is no notable change of taper and H* with the increase of altitude in ST and KL. For different forests,the taper and H* of L. sibirica and Picea schrenkiana forests increase and decrease significantly with the increase of altitude separately. The taper of Pinus sibirica and A. sibirica forests increases significantly with the increase of altitude. According to the GLM (General Linear Model) analysis,change of the height-diameter relationship with environmental factors is different from different regions and scales. Annual precipitation (AP),aspect of sample plots (ASP) and forest type are the most important variables to taper and H* in whole Xinjiang. ASP,slope position (POS) and mean annual temperature (MAT) are important in north Xinjiang,and ASP,AP and MAT are important in south Xinjiang.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69830779","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":"Distribution Patterns of the Species Richness of Plants and Animals in Xinjiang,China","authors":"Tang Zhi-yao","doi":"10.3724/sp.j.1148.2011.00001","DOIUrl":"https://doi.org/10.3724/sp.j.1148.2011.00001","url":null,"abstract":"There are 3 637 wild vascular plants,425 birds and 154 mammals in Xinjiang. In this study,a database of the distribution of all the plants,birds and mammals in Xinjiang was compiled,the distribution maps of the species richness of plants and animals were charted,the relations between these species were analyzed,and distribution hotspots of the species richness were obtained. The results revealed that the species richness in the northern and western parts of Xinjiang was higher than that in the southern and eastern parts. There were positive correlations of the richness among the vascular plants,halophytes,ephemeral plants,endemic plants and key protective plants,and there were also positive correlation between the richness of vascular plants and that of birds and mammals. Hotspots of different taxonomic groups were incongruent. Hotspots of vascular plants were distributed in the western part of the Altay Mountains,the western and central parts of the Tianshan Mountains,and the mountains in the west Junggar Basin; those of birds extended as far as the east Tianshan Mountains and the southern slope of the west Tianshan Mountains; and those of mammals were distributed only in the Altay Mountains and the west Tianshan Mountains. Altogether only 8.9% of the hotspots were shared by all the three groups. Current nature reserve networks cover the most of these hotspots. However,the Shawan-Manas region is an important conservation gap for biodiversity in Xinjiang.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69830209","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":"Analysis on Groundwater Based on Environmental Isotopes in the Longdong Basin: Analysis on Groundwater Based on Environmental Isotopes in the Longdong Basin","authors":"Xin-biao Liu, Bin Zhou, Yu Wei","doi":"10.3724/SP.J.1148.2009.00804","DOIUrl":"https://doi.org/10.3724/SP.J.1148.2009.00804","url":null,"abstract":"","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"26 1","pages":"804-810"},"PeriodicalIF":0.0,"publicationDate":"2010-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69826152","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":"Effects of Phosphorus Application on Phosphorus Adsorption and Desorption of Cotton Field Soil at Different Growing Stages: Effects of Phosphorus Application on Phosphorus Adsorption and Desorption of Cotton Field Soil at Different Growing Stages","authors":"Bo-lang Chen, Jian-dong Sheng, Pingan Jiang, Yong-gang Liu","doi":"10.3724/SP.J.1148.2009.00811","DOIUrl":"https://doi.org/10.3724/SP.J.1148.2009.00811","url":null,"abstract":"","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"26 1","pages":"811-818"},"PeriodicalIF":0.0,"publicationDate":"2010-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69826218","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":"Analysis on grey correlation degree of soil moisture content under different land use types in a wind-blown sand area.","authors":"Chen Lin, W. Lei, Zhang Qing-xia, Song Nai-ping","doi":"10.3724/SP.J.1148.2009.00840","DOIUrl":"https://doi.org/10.3724/SP.J.1148.2009.00840","url":null,"abstract":"In this paper,the grey correlation analysis is used to analyze the vertical and monthly dynamic change of soil moisture content under 4 land use types in a wind-blown sand area in Yanchi County,Ningxia Hui Autonomous Region of China.The results show that the vertical change of soil moisture content under different land use types are quite different,the similarity of soil moisture content in the middle layer(30～70 cm in depth) and the deeper layer(70～100 cm) is high,with an order of Caragana korshinskii land natural grassland Glycyrrhiza sp.land Medicago sativa land.The grey correlation degree of soil moisture content between the top layer(0～30 cm in depth) and the deeper layer(70～100 cm) was the lowest,and the difference of soil moisture content is the highest.In Glycyrrhiza sp.land,the grey correlation degree of soil moisture content and similarity of soil moisture content change are higher during the period from August to October,however it is quite different in July;in Caragana korshinskii land,the grey correlation degree is the lowest in September,and it increases gradually in other months;however,it fluctuates strongly in the change trend of high-low-high-low in Medicago sativa land and natural grassland.The method of grey correlation analysis can be used to ideally identify the similarity or dissimilarity of soil moisture content change under different land use types.","PeriodicalId":8385,"journal":{"name":"干旱区研究","volume":"99 1","pages":"840-845"},"PeriodicalIF":0.0,"publicationDate":"2010-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69826231","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}