摘要
利用GIS在兰陵溪小流域内生成80 m网格进行规则布点采样,对退耕还林后的主要5种植被类型土壤的渗透指标进行测定和比较,分析其特征及影响因子。结果表明:(1)土壤渗透速率与土壤非毛管孔隙度成极显著的正相关关系,与土壤毛管孔隙度和总孔隙度成显著正相关关系。(2)不同退耕还林模式土壤的初渗速率和稳渗速率在0-5 cm层差异较大,而在5-10 cm层则没有显著性差异。(3)随着坡度的增加土壤的初渗速率先增加后降低,土壤稳渗速率则没有明显的变化规律。(4)土壤的初渗速率和稳渗速率都随着坡位的降低而减慢,其中0-5 cm层比5-10 cm层下降得更快,初渗速率比稳渗速率下降得更快。(5)Kostiakov模型对该文研究的土壤渗透速率的回归效果极显著,可以在类似条件的地区推广。研究结果可为三峡库区退耕还林的生态效益评价提供数据支持。
Soil samples were collected from an aligned grid of 80 m×80 m by GIS in Lanlingxi small watershed,the index of soil infiltration under different vegetation types were determined and compared,the results showed that：（1） The correlation between the soil water infiltration rates and non-capillary porosity was very significant positive,the correlation between the soil water infiltration rates and capillary porosity was significant positive,and the total porosity was the same.（2）There were significant differences among initial and stable water infiltration rate in different vegetations in layer 0-5 cm,and little difference in layer 5-10 cm.（3） The first soil water infiltration rates showed a single-hump curve with slope gradient,the tip appeared in 20～25°.（4） Initial and stable water infiltration rate both slowed down with decreasing altitude,water infiltration rate in layer 0-5 cm decreased faster than that in layer 5-10 cm,and initial water infiltration rate decreased faster than stable water infiltration rate with decreasing altitude.（5） The process of soil water infiltration could be simulated well by Kostiakov model,and it can be used for similar conditions in Three Gorges reservoir area.The results provided valuable information on evaluating the ecology service of conversion of cropland to forest in Three Gorges reservoir area.
出处
《水土保持学报》
CSCD
北大核心
2010年第3期199-202,共4页
Journal of Soil and Water Conservation
基金
国家"十一五"科技支撑计划资助项目(No.2006BAD03A1301
2006BAD03A0701)
中国林业科学研究院公益基金(CAFYBB2007010)
长江三峡库区(秭归)森林生态定位站
关键词
土壤渗透
退耕还林
非毛管孔隙度
三峡库区
soil infiltration
conversion of cropland to forest
non-capillary porosity
Three Gorges reservoir area
