黄土高原丘陵沟壑区退耕生态系统土壤水分动态变化规律研究  

Dynamic Changes of Soil Moisure on the Recultivated Ecosystem in the Loess Hilly-Gully Region

作　　者：李婧[1] 李占斌[1] 李鹏[1] 陈磊[1] 

机构地区：[1]西安理工大学西北水资源与环境生态教育部重点实验室,西安710048

出　　处：《水土保持研究》2009年第5期153-156,共4页Research of Soil and Water Conservation

基　　金：教育部博士学科点专项科研基金(20060700004)

摘　　要：采用时间代替空间的方法研究黄土高原丘陵沟壑区退耕地生态系统的水分动态变化规律,结果表明,随着退耕年限的增长,自然恢复条件下的退耕坡地土壤水分含量先增大,后逐渐稳定,人工干预条件下耕层含水量较多,40-160cm层减少,200cm含水量约为4%,且随着退耕年限增加而减少,接近凋萎系数4%,300cm以下土壤含水量则比较稳定,维持在9%～12%;退耕40a的阴坡立地恢复效果最好,阳坡立地的深层土壤水分亏缺严重。相比之下,早期的人工干预措施效果较为明显,随着退耕年限的增加,自然恢复则逐渐占据优势。The changing dynamics of soil moisure were studied, on the returning farmland to forest ecosystem in the loess hilly--gully region. It showed that, the soil moisure increased at first and then reached a plateau under the condition of nature recovery with the vegetation restoration years growth. It owns much water in topsoil layer, soil moisure is 4% in the deepth of 200 cm, close to wilting coefficient, and then stabilized under the 300 cm deepth, about 9%-12%, of the artificially accelerated ecological restoration. There was a serious deficiency of deep soil moisure in the sunny slope, and the shady slope is better than sunny slope when the years of returning farmland to forest ecosystem over 40 years. In contrast, the effect of artificial accelerated ecological restoration is obviously in the early years, then the nature restoration hold advantage with the increase years.

关 键 词：退耕地 坡向 恢复方式 土壤含水量 

分 类 号：X152.7[环境科学与工程—环境科学] X171.1