摘要
根据已有研究和野外考察获得的资料,对若尔盖草原沙化原因进行分析。结果表明:地质的变迁,河流频繁改道,母岩形成的土壤含沙量高,为该地区草原沙化提供了大的自然环境背景;气候干暖化为若尔盖高原土地沙化创造了条件;地表径流造成表土层流失,沙层裸露,风力的驱动作用,促进沙流蔓延,积沙及以沙丘的形成和移动等一系列沙化过程的发生、发展;疏干沼泽、扩大牧场,极大地加速了若尔盖湿地由沼泽→半沼泽→草甸→草原→沙漠化发展方向演变;不合理管理与过牧、超限度利用是导致草地沙化最主要的原因;若尔盖草原沙化过程不是一个单纯的自然过程,而是一个自然与经济、社会相关联,而以人为活动为诱导因素所引起的土地沙化过程,是自然因素和人为因素共同作用下,由自然过程和人为加速过程彼此叠加并相互反馈的结果。
Based on previous studies and data collected during field investigation, analyze the causes of grassland desertification in Ruoergai plateau. The results showed that the geological changes, frequent river diversion, rock becoming high sediment concentration in soil, providing a great backdrop for the region＇s grassland desertification of Ruoergai; Dry and warm climate create the conditions for desertification of Ruoergai; Runoff caused the loss of topsoil, sand layer is exposed, wind-driven role, promoting the spread of sand flow occurs accumulated sand and dune formation and move to a series of desertification process development; Dewatering swamps, pastures expanded greatly accelerated the evolution of Ruoergai marsh wetlands → semi-swamp → meadow → grassland →desertification development;Overgrazing and irrational management,and use of ultra-limits is the cause of most of the grassland desertification; Ruoergai grassland desertification process is not a simple natural process, but a natural and economic, social association, and human-induced activities caused by factors desertification process, which is the natural and human factors work together by natural processes and anthropogenic acceleration feedback superimposed on each other and each other＇s results.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2015年第3期100-106,共7页
Journal of Central South University of Forestry & Technology
基金
国家科技支撑计划"西南生态安全屏障决策体系"(2011BAC09B08-07)
关键词
土地沙化
驱动因子
自然因素
人为因素
若尔盖高原
land desertification
driving factors
natural factors
hman Factors
Ruoergai Plateau
