摘要
在土地荒漠化过程中,植被群落的变化是与土壤养分的空间变异密切相关的。本文以鄂尔多斯高原梁地退化草场为研究对象,采用地统计学的分析方法对本氏针茅群落和牛心朴子群落中小尺度土壤养分的空间变异规律进行了分析。结果表明,尽管在退化过程中没有灌木的侵入,但在两种典型群落中均存在着肥力岛的分布,其形成及发展的机制并非灌木侵入,而是由于植被覆盖的破坏导致土壤侵蚀加剧的结果,因此灌木的侵入并不能作为鄂尔多斯高原梁地草场退化的评价指标。同时也证明了多变量指标克里格法在土地养分状况的综合评价中应用的可行性。
During desertification processes, change of plant community is closely related to spatial variation of soil nutrients. This research, conducted in a degraded hilly rangeland in the Ordos Plateau, aims to investigate spatial variation of soil nutrients for Stipa bungeana and Cynanchum komarovii communities at small scale using geostatistics methods. Results show that in spite of absence of shrub encroachment, fertile islands are distributed in two typical communities. Their development is not resulted from shrub encroachment, but from accelerated soil erosion due to vegetation damage, Hence, shrub encroachment cannot be considered as an assessment indicator of rangeland degradation. Multiple variable indicator Kriging method is also proved to be an alterative for integrated evaluation of soil nutrients.
出处
《水土保持通报》
CSCD
北大核心
2007年第5期11-16,共6页
Bulletin of Soil and Water Conservation
基金
国家"十五"科技攻关项目(2005BA517A04)
国家自然科学基金(30571529
30671722)
关键词
多变量指标克里格法
梁地草场
土壤养分
肥力岛
荒漠化过程
multiple variable indicator Kriging （MVIK）
hilly rangeland
soil nutrients
desertification process
