生态学报2017，Vol.37Issue(1)：277-285,9.DOI:10.5846/stxb201607221492
若尔盖沙化草地恢复过程中土壤特性及水源涵养功能
Changes in water conservation and soil physicochemical properties during the recovery of desertified grassland in Zoigê, China
摘要
Abstract
The restoration and reconstruction of desertified grassland has been continually initiated by the central government of China since 1995,and the ecological benefits of grassland restoration gained attention both home and abroad.In particular,the water conservation function of grassland is regarded as the primary indicator of the ecosystem's restoration and is one of the most important grassland ecosystem services.Changes in water conservation are related to the water cycle and global climate change.The present study investigates the moisture and physicochemical properties of desertified grassland soil over several years (managed sample plot in 1995,2007,2009,2010,and 2011;non-managed sample plot in 2012;and normal grazing area in 2012) in Zoigê County,using both field investigation and experiments to analyze the dynamics of water conservation and its determinants.During the recovery process,1) Soil texture had changed that tight sandy soil was gradually converted to sandy loam,water conservation and fertilizer preservation capacity were increased,and bulk soil density decreased from 1.7 g/cm3 in the non-managed area to 1.3 g/cm3 in the normal grazing area.2) Soil pH value decreased from 7.6 to 6.7 with the duration of management,and according to the classification of soil pH,the soil was neutral soil which was suitable for vegetation growth.Meanwhile,soil organic matter of the treatment areas was far lower than that of the normal grazing area,although the organic matter exhibited an upward trend.3) Soil moisture exhibited a V-shaped trend that the content decreased in the early stage of management and the content of managed area in 2009 was lowest for only 6.8％.But in the late stage of management,the content increased from 6.8％ to 12.1％ in the managed area in 1995,in which the grassland had been restored and water conservation got improvement.4) Correlation analysis indicated that soil moisture was significantly correlated with organic matter content,soil texture,pH,biomass,and soil carbon content,although the relationship between soil moisture and pH was negative.5) As the duration of treatment increased,the soil degradation index decreased,and the soil conditions improved greatly.关键词
若尔盖草地/草地沙化/土壤理化性质/水源涵养Key words
Zoigê grassland/desertification/soil physicochemical properties/water conservation引用本文复制引用
税伟,白剑平,简小枚,祁新华,苏正安,陈勇,蔡应君..若尔盖沙化草地恢复过程中土壤特性及水源涵养功能[J].生态学报,2017,37(1):277-285,9.基金项目
美国国家地理科研基金资助项目(9336-13) （9336-13）
国家自然科学基金资助项目(41401313) （41401313）
四川省教育厅自然科学重点项目资助项目(12ZA273) （12ZA273）
福州大学人才基金(510211) （510211）
