黑河流域干旱生态系统红砂荒漠空间斑块结构及其生态适应策略（英文）

编号 zgly0001675837

文献类型 期刊论文

文献题名 黑河流域干旱生态系统红砂荒漠空间斑块结构及其生态适应策略（英文）

作者 李炜  李小雁  黄永梅  王佩  张赐成 

作者单位 StateKeyLaboratoryofEarthSurfaceProcessesandResourceEcology  BeijingNormalUniversity  SchoolofLandResources&UrbanandRuralPlanning  HebeiGEOUniversity  SchoolofNaturalResources  FacultyofGeographicalScience  BeijingNormalUniver 

母体文献 Journal of Geographical Sciences 

年卷期 2019年09期

年份 2019 

分类号 X171.1 

关键词 patchstructure  spatialpattern  precipitation  soilheterogeneity  Reaumuriasoongorica  HeiheRiverBasin 

文摘内容 In many arid ecosystems, vegetation frequently occurs in high-cover patches interspersed in a matrix of low plant cover. However, theoretical explanations for shrub patch pattern dynamics along climate gradients remain unclear on a large scale. This context aimed to assess the variance of the Reaumuria soongorica patch structure along the precipitation gradient and the factors that affect patch structure formation in the middle and lower Heihe River Basin(HRB). Field investigations on vegetation patterns and heterogeneity in soil properties were conducted during 2014 and 2015. The results showed that patch height, size and plant-to-patch distance were smaller in high precipitation habitats than in low precipitation sites. Climate, soil and vegetation explained 82.5% of the variance in patch structure. Spatially, R. soongorica shifted from a clumped to a random pattern on the landscape towards the MAP gradient, and heterogeneity in the surface soil properties(the ratio of biological soil crust(BSC) to bare gravels(BG)) determined the R. soongorica population distribution pattern in the middle and lower HRB. A conceptual model, which integrated water availability and plant facilitation and competition effects, was revealed that R. soongorica changed from a flexible water use strategy in high precipitation regions to a consistent water use strategy in low precipitation areas. Our study provides a comprehensive quantification of the variance in shrub patch structure along a precipitation gradient and may improve our understanding of vegetation pattern dynamics in the Gobi Desert under future climate change.