摘要
鄱阳湖沙山地区土地沙化属于南方荒漠化的一种典型类型,是在湖滨沙质阶地的基础上形成的,它既有别于北方的土地沙漠化,又区别于南方其它类型的荒漠化。基于野外调查的基础上对该地区土地沙化特征进行描述,同时从历史背景、当代气候特征以及鄱阳湖水位变化等几个方面对沙化的成因进行了分析。分析结果表明:(1)目前该地区土地沙化趋于变好态势;(2)历史上的海平面变化及气候特征成为鄱阳湖沙山形成的主要因素,而沙山又为该地区当代土地沙化提供了丰富的物质来源。(3)当代气候特征下,流水及固定风向的长期侵蚀为土地沙化提供了动力因素,而鄱阳湖水位的周期性变化,为土地沙化的物质循环提供了有利的环境。总的来说,鄱阳湖沙山地区的土地沙化是在历史地质地貌变迁、当代气候条件、湖泊变化以及人为活动等因素的共同作用下形成的独具特色的亚热带土地荒漠化。
The land desertification in the region of Poyang Lake is a typical type of desertification of South China, which occurs in historical sand terrace. It is different not only from desertification in north china, but also from other desertification types in South China. Based on field investigation, historical environment background, present climatic characteristics, and changes of Poyang Lake water level, the paper analyzes the characteristics and causes of desertification. Results are as follows. （1） The land desertification of the region tends to be ameliorated. （2） The sand hills formed from the historical sea level change and climate character- istics afford sand source for the sandy desertification. （3） Under the present climatic affection, water flow and strong wind provide power factors for sandy desertification and furthermore, the change of water level of Poyang Lake is conducive to sand cycle. Generally, the desertification of sand hills in Poyang Lake forms from historical geological feature change, present climate and water-level change, and human being activities and is a typical type of South China＇s desertification with regional characteristics.
出处
《水土保持通报》
CSCD
北大核心
2010年第2期159-163,共5页
Bulletin of Soil and Water Conservation
基金
国家科技支撑项目"沙化土地与水土流失区治理技术研究与示范"(2007BAC23B03)
关键词
鄱阳湖
土地沙化
沙山
成因
Poyang Lake
land desertification
sandy hill
cause
