摘要
石羊河流域中下游位于干旱荒漠区,河岸带植被破坏、生物多样性下降,区域生态系统和生态过程受到严重影响。运用空间变化代替时间过程的方法,对石羊河流域中下游不同河段河岸带植被与土壤特征及两者相关性进行了研究。结果表明:石羊河中下游从常流水区、季节性流水区到常年断流区,随着河床的常年和季节性断流,植被与土壤逐渐退化。植被盖度、生物量和丰富度指数呈下降趋势,多样性指数呈上升趋势。不同河段的土壤理化特征差异性显著,河流断流对土壤产生了直接或间接影响;但是从季节性流水区到常年断流区表征土壤肥力和水分的指标均呈增大趋势,常年断流区土壤已经逐渐改善。植被盖度和生物量分别与土壤含水量、全氮,电导率有线性关系。修复该区的退化生态系统需要保证适宜的土壤含水量。
The study area is located at middle and lower reaches of Shiyang River in the arid desert area. With the destruction of riparian vegetation,the biological diversity declined,regional ecosystem and ecological process were affected seriously. According to investigation results of different types of riparian vegetation and soil features at middle and lower reaches of Shiyang River basin,taking spatial variation instead of time process,the results was drown as follows： Both the vegetation and soil of the areas were degraded gradually from wet to seasonal wet then to dry at middle and lower reaches of Shiyang River basin. The vegetation coverage,biomass and richness showed the downtrend,while the vegetation diversity showed an increasing tendency; the difference of soil physical and chemcial characteristics in different reaches were very remarkable,soil features were directly or indirectly influenced by river blanking. However,both soil moisture and soil fetility major indices showed an increasing tendency from seasonal wet to dry,soil in dry section has been gradually improved. There was linear relationship between vegetation coverage,biomass and soil moisture,total nitrogen and conductivity respectively. It needs to guarantee suitable soil moisture to restore the degraded ecosystem in study areas.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2014年第5期115-120,共6页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(31060080
41161006)
国家重点基础研究发展计划项目(2120CB723203)资助
关键词
石羊河中下游
植被
土壤特征
相关关系
middle and lower reaches of Shiyang River
riparian vegetation
soil properties
correlation
