水土保持通报2017，Vol.37Issue(5)：10-15,6.DOI:10.13961/j.cnki.stbctb.2017.05.002
毛乌素沙地东南缘沙漠化过程中植被的退化和稳定性
Vegetation Degradation and Its Stability in Desertification at Southeastern Edge of Mu Us Sandy Land
摘要
Abstract
[Objective] To analyze the mechanisms of vegetation degradation and stability maintenance during the process of desertification at the southeastern edge of Mu Us sandy land,and to provide scientific basis for the repairing and controlling of desertification.[Methods] The methods of field investigation,field sampling,indoor assay and statistical analysis were integrated to analyze the change of vegetation characteristics during desertification in the study area.[Results] The results of functional and structural characteristics showed that the vegetation coverage,density,richness and Simpson diversity index reduced;The aboveground biomass increased first and then decreased.The changing regularity of organic matter was not obvious,while the total nitrogen content decreased and C/N increased.Vegetation characteristics changed suddenly in the mild desertification stage which was the key stage for desertification repairing.Furthermore,the quantitative measurement of vegetation stability showed that the stability index decreased in the process of desertification,stable and basically stable in non-desertification stage and potential desertification stage,unstable in other stages.[Conclusion] The vegetation degrades and the stability indexes decrease with desertification deepens.Therefore,maintain the virtuous circle of plant-soil system is the key of vegetation restoration and desertification control.关键词
毛乌素沙地/植被退化/植被稳定性/定量测度Key words
Mu Us sandy land/vegetation degradation/vegetation stability/quantitative measurement分类
天文与地球科学引用本文复制引用
杨梅焕,曹明明,朱志梅..毛乌素沙地东南缘沙漠化过程中植被的退化和稳定性[J].水土保持通报,2017,37(5):10-15,6.基金项目
国家自然科学基金项目“陕北沙漠化逆转过程中土壤—植被反馈机制及植被演替效应研究”(41501571) （41501571）
陕西省自然科学基础研究项目“陕北沙漠化逆转过程中土壤植被反馈机制研究”(2015JQ4110) （2015JQ4110）
陕西省教育厅专项科学研究项目“陕北生态脆弱区沙漠化驱动力定量化研究”(14JK1479) （14JK1479）
