摘要
为了了解沙地灌丛对于土壤动物是否存在聚集作用,于2008—2009年在科尔沁沙地调查了流动沙地小叶锦鸡儿和黄柳灌丛内外大型土壤动物的群落特征。结果表明:流动沙地灌丛内大型土壤动物类群数量、密度和Shannon多样性指数较灌丛外流沙地分别高125.0%～175.0%、52.8%～263.9%和34.6%～57.1%,显现出明显的"虫岛"效应,其中小叶锦鸡儿灌丛的"虫岛"效应大于黄柳灌丛;灌丛内外土壤优势动物类群虽然相同,并有少量共有类群,但灌丛下聚集了多个流沙裸地没有的大型土壤动物类群,群落功能群结构也发生明显改变;流动沙地灌丛的"虫岛"效应主要源于灌丛的小气候效应和肥岛效应,其降风滞尘、遮蔽暴晒、改善土壤质地和养分条件的作用是导致流动沙地灌丛"虫岛"效应形成的主要机理。
In 2008-2009, an investigation was conducted on the community charactenstlcs ot soil macro-fauna within and outside the Caragana microphylla and Salix gordejevii in Horqin Sand Land, aimed to understand whether the shrubs in mobile sand land could gather soil macro-fau- na. As compared with those outside the shrubs, the group number, individual density, and fauna within the shrubs were increased by 125 0% 175 0% , Shannon diversity of soil macro-fauna within the shrubs were increased by 125.0% -175.0% ,52.8% -263.9%, and 34.6% -57.1%, respectively, indicating that shrubs had obvious ＂bug island＂ effect in mobile sand land. C. microphylla had a greater ＂bug island＂ effect than S. gordeje^di. Within and outside the shrubs, there were the same dominant groups and a few com- mon groups of soil macro-fauna. However, many soil macro-faunal groups which couldn＇ t survive outside the shrubs appeared within the shrubs, and the functional group structure of the macro- fauna had obvious change. The ＂bug island＂ effect of the shrubs in mobile sand land mainly came from the microclimate effect and ＂fertile island＂ effect of shrubs, which reduced wind speed and detained dust, occluded hot sun, improved soil texture and soil moisture, and in- creased soil nutrient contents, being the main mechanisms of the shrubs in mobile sand land in gathering soil macro-fauna.
出处
《生态学杂志》
CAS
CSCD
北大核心
2012年第12期2990-2995,共6页
Chinese Journal of Ecology
基金
国家科技支撑项目(2011BACO7B02)
国家重点基础研究发展计划项目(2009CB421303)
国家自然科学基金项目(30972422)资助
关键词
科尔沁沙地
灌丛
大型土壤动物
虫岛效应
机制
Horqin Sand Land
shrubs
soil macro-fauna
bug island effect
mechanism.
