摘要
西南喀斯特区域是特殊地质背景制约的脆弱生态带。论文以西南喀斯特地区典型生态系统不同退化/恢复阶段物质循环与植被恢复响应为主线,研究生态系统中的水分和养分过程,包括坡面降雨-入渗-产流-土壤水分再分布过程、土壤水分养分空间分异特征、微生物种群结构及其主要影响因素,初步揭示了"地下过程为主、地表过程为辅"的水土物质迁移规律与峰丛坡地土壤水分养分状况高于洼地的趋势;通过不同演替阶段、石漠化程度植被生态系统监测,初步揭示植被生态适应性与植物多样性的时空格局,提出发展草食畜牧业、构建农牧复合生态系统的替代型喀斯特区域生态重建发展模式。
Karst topography and carbonate rock related landscapes are considered very important yet fragile geomorphic features. In particular, ecosystems in karst regions are extremely sensitive to anthropogenic disturbances. For karst topographic features of southwest China this is especially true given the presence of highly developed tower karst, long history of human exploitation, and current high human population density. It is commonly agreed that the frequent human activities in this karst region have altered the water, and carbon budgets. Among the various consequences of human disturbance, rock desertification, the processes where areas formerly covered with vegetation and soil are converted to rocky / barren lands, is a very common process. The speed of rock desertification reach a high point during the 1980s resulting in the deterioration of the karst ecosystem and, subsequently, worsening local poverty levels. In this paper, the key issues of land use and ecological processes are discussed. Soil moisture plays an important role in plant growth and vegetation rehabilitation,and has a high temp-spatial heterogeneity. The characteristics of spatial distribution of soil moisture are largely dependent on land use types, topographic position, soil texture and others . different land use types may result in diferent patterns on nutrient loss and runof, dunes. The responses of soil improvement to vegetation restoration were also analysed. The innovative approach for improvement in both the restoration of degraded ecosystem s and regional sustainable development were discussed.
出处
《农业现代化研究》
CSCD
北大核心
2008年第6期641-645,共5页
Research of Agricultural Modernization
基金
中国科学院西部行动计划(编号:KZCX2-XB2-08)
国家科技支撑计划
