应用生态学报2018，Vol.29Issue(3)：765-774,10.DOI:10.13287/j.1001-9332.201803.013
黄土丘陵区不同土地利用类型土壤水分变化特征
Characteristics of soil moisture variation in different land use types in the hilly region of the Loess Plateau,China
摘要
Abstract
Soil water availability is a key factor restricting the ecological construction and sustainable land use in the loess hilly region. It is of great theoretical and practical significance to understand the soil moisture status of different land use types for the vegetation restoration and the effective utilization of land resources in this area. In this study,EC-5 soil moisture sensors were used to continuously monitor the soil moisture content in the 0 - 160 cm soil profile in the slope cropland,terraced fields,jujube orchard,and grassland during the growing season (from May to October) in the Yuanzegou catchment on the Loess Plateau,to investigate soil moisture dynamics in these four typical land use types. The results showed that there were differences in seasonal variation,water storage characteristics,and vertical distribution of soil moisture under different land use types in both the normal precipitation (2014) and dry (2015) years. The terraced fields showed good water retention capacity in the dry year,with the average soil moisture content of 0-60 cm soil layer in the growing season being 2.6％,4.2％,and 1.8％ higher than that of the slope cropland,jujube orchard,and grassland (all P＜0.05) . The water storage of 0-160 cm soil profile was 43. 90,32. 08,and 18. 69 mm higher than that of slope cropland,jujube orchard,and grassland,respectively. In the normal precipitation year,the average soil moisture content of 0-60 cm soil layer in jujube orchard in the growing season was 2.9％,3.8％,and 4.5％ lower than that of slope cropland,terraced fields,and grassland,respectively (all P＜0.05) . In the dry year,the effective soil water storage of 0-160 cm soil profile in the jujube orchard accounted for 35.0％ of the total soil water storage. The grey relational grade between the soil moisture in the surface layer (0-20 cm) and soil moisture in the middle layer (20-100 cm) under different land use types was large,and the trend for the similarity degree of soil moisture variation followed terraced fields＞ grassland ＞ slope cropland ＞ jujube orchard. The slope cropland in this area could be transformed into terraced fields to improve the utilization of precipitation and promote the construction of ecological agriculture. Aiming at resolving the severe water shortage in the rain-fed jujube orchard for the sustainable development of jujube orchard in the loess hilly region,appropriate water management measures should be taken to reduce the water consumption of jujube trees and other inefficient water consumption.关键词
黄土丘陵区/土地利用/土壤水分/蓄水特征/垂直变化/灰色关联分析Key words
loess hilly region/land use/soil moisture/soil water storage characteristics/vertical variation/grey relational analysis引用本文复制引用
唐敏,赵西宁,高晓东,张超,吴普特..黄土丘陵区不同土地利用类型土壤水分变化特征[J].应用生态学报,2018,29(3):765-774,10.基金项目
本文由"十三五"国家重点研发计划项目(2016YFC0400204)和国家自然科学基金项目(41571506,41771316,51579212)资助 （2016YFC0400204）
