| 岩溶峰丛洼地不同环境水土流失差异及防治研究——以广西果化岩溶生态研究基地为例 |
| |
| 关键词:water and soil loss soil leakage karst peak-cluster depression land use karst ecological Guangxi |
| 基金项目:国家科技支撑计划课题(编号: 2011BAC09B02)；国土资源部公益性行业专项(编号: 201211086-01-02)；水利部公益性行业专项(编号: 201101019)；广西科技开发项目(编号: 桂科攻1140002-3-1) |
|
| 摘要点击次数: 4493 |
| 全文下载次数: 2213 |
| 摘要: |
| The Difference in Soil Erosion in Different Environments of Karst Peak-cluster Depression and the Study of Soil Erosion Prevention: A Case Study of Guohua Karst Ecological Experimental Site, Guangxi |
| In the special karst ground water system, there exist different processes and features of water and soil loss in karst mountains. Especilly in karst peak cluster depression, much more water and soil are lost from the leakage of karst fissures than from the surface flow. Some monitoring stations of water and soil loss were built in Guohua karst ecological experimental site, Pingguo County, Guangxi, with the purpose of investigating the difference between the surface soil erosion and the soil leakage in different environments of the karst peak-cluster depression. The monitoring results reveal the most remarkable differences in different geomorphologic positions. From peak, paddle, hill slope, hill foot to the bottom of depression, the mean annual soil leakage loss moduli are 49.09 t/(km2?a), 212.06 t/(km2?a), 727.71 t/(km2?a), 1104.03 t/(km2?a) and 909.11 t/(km2?a) respectively, which possess 92.43%, 96.24%, 78.57%, 70.88% and 38.68% of the total mean soil loss moduli in the points respectively. There are five kinds of main land uses in the karst peak-cluster depression, i.e., slope farmland, young secondary forest, kuding tea garden, grass land, and brush and grass land. In the slope farmland, thare is not only the biggest soil erosion modulus but also a annual increase tendancy. The soil erosion modulus has an annual decrease tendancy in the other four lands, and the lowest value is in the grass land. Therefore, the prevention of soil erosion should be based on different measures in different geomorphologic positons of the peak cluster depression. In the peak, the water source forest should be mainly developed. In the hill slope, the attention should be paid to the eco-prodution and the decrease of the soil leakage. And in the depression, the water drainage system should be the key engineering. With the harnessing of rocky desertification and the rehabilitation of the ecology in Guohua karst ecological experimental site, the mean water and soil loss modulus of the karst peak cluster depression decreased by about 65% from 2003 to 2010. |
| LUO Wei-qun,ZHANG Hui-xu,JIANG Zhong-cheng,JIN Ke-mo,LI Yan-qing,WANG Zhi-guang.2014.The Difference in Soil Erosion in Different Environments of Karst Peak-cluster Depression and the Study of Soil Erosion Prevention: A Case Study of Guohua Karst Ecological Experimental Site, Guangxi[J].Acta Geoscientica Sinica,35(4):473-480. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|