摘要
土壤流失是石漠化最基本的过程之一。本文采用广东省阳山县江英镇实验小区的观测资料,分析粤北岩溶山区不同土地利用类型的侵蚀差异。结果表明,裸地表层的养分流失速度很快,其侵蚀量是无人为扰动的原始草坡的60余倍,耕地的侵蚀量平均也达到原始草坡的15倍左右。有植被覆盖的原始草坡地和耕地的侵蚀量均与次降水量的相关性更高,而裸地的侵蚀量与连续30分钟最大雨强的相关性高,这一观测结果表明地表植被抵御短期强降水侵蚀土壤的效果明显。
The most essential process of karst rocky desertification is soil loss. In this article, based on the observation data from the sample plots in Jiangying town, Yangshan county, the differences of erosion under different land use are analyzed in north Guangdong province karst area. The results show that the nutrient loss is fastest on bare A-horizon with the speed of nutrient loss 60 times higher than that on untouched natural grassland, and that the speed of nutrient loss on farmland about 15 times higher than that on untouched natural grassland. It also shows that the soil erosive quantity on untouched natural grassland and corpland is most related to single rainfall, but the erosive quantity on bare-land is more related to the maximum intensity of continuous rainfall in 30 minutes. The above-mentioned results indicate that vegetation can effectively protect land from soil erosion by short-term strong rainfall.
出处
《中国岩溶》
CAS
CSCD
北大核心
2006年第4期280-284,共5页
Carsologica Sinica
基金
国家自然科学基金项目(编号:30471421)
关键词
石漠化
土壤侵蚀
岩溶山区
粤北
Karst rocky desertification
Soil erosion
Karst mountain
North Guangdong province
