宁南山区草地植被恢复方式对土壤饱和导水率的影响  

Effects of grassland vegetation restoration on soil saturated hydraulic conductivity in mountain area of southern Ningxia

作　　者：张扬[1,2] 赵世伟[1] 华娟[1,3] 

机构地区：[1]中国科学院水利部水土保持研究所,陕西杨凌712100 [2]陕西省地产开发服务总公司,西安710075 [3]中国科学院研究生院,北京100049

出　　处：《中国水土保持科学》2009年第5期100-104,共5页Science of Soil and Water Conservation

基　　金：国家"十一五"科技支撑计划课题"半干旱黄土丘陵区退化生态系统综合管理技术与模式"(2006BCA010A07);国家"十一五"科技支撑计划课题"宽谷丘陵区农牧综合开发模式与示范"(2006BAD09B08)

摘　　要：为评价宁南山区草地植被不同恢复方式对土壤入渗性能的影响,以不同植被群落的饱和导水率为研究对象,采用逐步回归研究退耕农地、禁牧荒地、封育草地导水率的变化及影响因子,并探讨了其作用机制。结果表明：3种植被恢复方式均有利于0-40 cm土壤饱和导水性能提高;各土层土壤饱和导水率均随植被恢复而不断提高,0-5 cm土层改善作用最为明显;农地退耕序列和荒地禁牧序列5-40 cm土层、封育草地序列0-40 cm土层土壤饱和导水率随土层深度下降而降低;影响土壤饱和导水率的因子为土壤有机质因子和土壤结构因子;3种植被恢复方式土壤有机质质量分数与Ks均呈显著的线性相关关系,在该区域有机质质量分数越高,Ks增加越快;土壤有机质积累是土壤饱和导水率提高的根本动力。因此,草地封育更利于提高使该地区土壤导水性能提高,促进生态恢复。Studying on soil saturated hydraulic conductivity （Ks） characteristics of different measurements for vegetation restoration in mountain area of southern Ningxia will provide scientific basis for evaluating different measurements for vegetation restoration and discussing mechanism. There measurements for vegetation restoration were beneficial to improve Ks. Ks on 0 - 5 cm were improved most obviously. Values of Ks quickly reduced with depth under different communities. Ks was directly affected by soil organic matter（SOM） and capillary porosity. There was linear correlation between SOM and Ks in three measurements for vegetation restoration. The higher the content of SOM, the faster Ks increase. The accumulation of SOM was driving force for Ks. So enclosed meadows was the best measure for improvement of Ks and eclolgical restoration.

关 键 词：植被恢复 土壤饱和导水率 土壤有机质 土壤结构 宁南山区 

分 类 号：S152.75[农业科学—土壤学] S812[农业科学—农业基础科学]