粤北石漠化灌丛坡地模拟降雨地表径流水中钙离子含量变化  

Calcium Ion Loss along with Runoff on Shrub Slopes in Rock Desertification Area of Northern Guangdong under Rainfall Simulation Experiment

作　　者：魏兴琥[1] 陆冠尧[1] 周红艳[2] 徐喜珍[2] 雷俐[2] 

机构地区：[1]佛山科学技术学院国土资源环境与旅游研究中心,广东佛山528000 [2]华南师范大学地理科学学院,广东广州510630

出　　处：《中国沙漠》2011年第5期1343-1347,共5页Journal of Desert Research

基　　金：国家自然科学基金项目(30870469;31170486)资助

摘　　要：通过模拟降雨试验,研究粤北地区不同石漠化程度的灌丛坡地地表径流水中钙离子含量的变化。结果表明,在不同雨强下,不同石漠化灌丛坡地地表径流量、地表径流水钙离子浓度和地表径流水钙离子总量随石漠化程度的加重呈逐渐上升后又降低的倒"U"型趋势;在同一雨强下,潜在、轻度和极重度石漠化坡地径流水钙离子流失量远低于中度和重度石漠化坡地;地表水中的钙离子流失总量和地表径流量、土层厚度、岩石裸露率均有较高的相关性,其中与地表径流量达到显著性相关。Calcium ion loss volumes with runoff for 30 minutes on shrub slopes in different rock desertification areas in northern Guangdong were observed in a rainfall simulation experiment.Results show that： under different simulated precipitation densities,the variation of runoff,calcium ion concentration and total calcium ion loss with runoff for 30 minutes over shrub slope in different degrees of rock desertification area like an inverted ＂U＂ type;under a specific rainfall intensity,the calcium ion loss on shrub slope in potential,slight and extremely severe rock desertification areas are much lower than on moderate and severe rock desertification areas.The calcium ion loss volume along with runoff on shrub slope is closely related with runoff,soil thickness and ratio of exposed rock,among which there is a significant correlation between calcium ion loss and runoff.

关 键 词：石漠化 钙离子 径流 粤北 

分 类 号：X144[环境科学与工程—环境科学] P342[天文地球—水文科学]