摘要
[目的]探讨植被系统退化过程中土壤质量的变化及其对生态环境的影响。[方法]在贵州花江喀斯特地区,按照植被退化程度的不同,对森林、灌丛、荒草地3种类型分别进行采样,筛选适合的土壤质量指标对生态环境影响进行评价。[结果]随着喀斯特地区植被的退化,土壤pH值、有机质、氮、磷、钾养分含量出现不同程度的下降,土壤毛管孔度降低,土壤容重增加,土壤水分含量逐渐减少,土壤环境向旱生、贫瘠方向演变。以喀斯特植被演变过程中土壤有机质、有效氮、磷、钾养分、土壤物理性质等指标定量评判土壤质量退化对生态环境的影响程度,聚类分析结果表明,对生态环境的影响大致分为3个等级。[结论]植被退化度越高,土壤质量退化严重,对生态环境的影响越明显。
[Objective] The research aimed to discuss the changes of soil quality in the degeneration process of vegetation system and its effects on the ecolegical environment. [Method] According to the different vegetation degradation degree in Karst region of Huajiang in Guizhou province, samples were collected from 3 types of land including forest, shrub and waste grassland. The suitable soil quality index were screened out and its effects on the ecologicol environment was evaluated. [Result] With the vegetation degradation in Karst region, pH value, the nutrient contents of organic matter, N, P and K were decreased to different extent, soil capillary porosity was reduced, soil bulk density was increased, water content in soil was gradually decreased and the soil environment evolved towards the directions of drought and leanness. Such indexes as soil organic matter, the nutrients of available N, P and K, the physical properties of soil in the evolvement process of vegetations in Karst were used to evaluate the effect degree of soil quail .ty degradation on the ecological environment. The results of clustering analysis showed that the effects on the ecological environment were approximately classified into 3 grades. [ Conclusion] The higher the vegetation degree was and the more serious the degradation of soil quality was, the more obvious the effects on ,the ecological environment were.
出处
《安徽农业科学》
CAS
北大核心
2008年第9期3850-3852,共3页
Journal of Anhui Agricultural Sciences
基金
农业部环境保护科研监测所基本科研业务费专项资助(2007-AEPI-9)
关键词
喀斯特
植被退化
土壤质量
环境评价
Karst
Vegetation degeneration
Soil quality
Environmental impact evaluation
