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黄土丘陵区退耕地植被恢复过程中土壤入渗特征的变化
引用本文:勃海锋,刘国彬,王国梁.黄土丘陵区退耕地植被恢复过程中土壤入渗特征的变化[J].水土保持通报,2007,27(3):1-5,31.
作者姓名:勃海锋  刘国彬  王国梁
作者单位:1. 西北农林科技大学,陕西,杨凌,712100;中国科学院,水利部,水土保持研究所,陕西,杨凌,712100
2. 中国科学院,水利部,水土保持研究所,陕西,杨凌,712100
基金项目:国家科技支撑课题;中国科学院"西部之光"人才培养计划
摘    要:采用空间代替时间的方法,将黄土丘陵区1,4,8 a退耕地上的植物群落组成演替序列,并以当地较稳定的天然狼牙刺群落和人工柠条群落作对照,用圆盘入渗仪(Z—700)对上述群落下土壤稳定入渗过程和入渗特征进行了对比研究。(1)天然狼牙刺群落下土壤稳定入渗速率小于人工柠条群落下的稳定入渗速率,因为人工柠条群落生物量较高,植被对土壤的改善作用更大。(2)随着退耕年限的增加,土壤的平均入渗速率和饱和导水率也在增加,其中1,4,8 a退耕地上饱和导水率分别达到狼牙刺群落下的52%,74%和98%。稳定入渗率能够达到狼牙刺群落下的57%,88%和91%。说明随着退耕地上植被的恢复,土壤稳定入渗速率不断提高。(3)土壤的入渗特征受土壤理化性质影响很大。其中土壤孔隙度对土壤稳定入渗影响最大,因为随着退耕地植被的恢复,通过根系的穿插分割作用,以及根系死亡后形成的生物性大孔,使土壤中有效孔隙数量不断增加,土壤入渗性能得到提高。

关 键 词:黄土高原  植被恢复  入渗  饱和导水率
文章编号:1000-288X(2007)03-0001-05
收稿时间:2006/10/12 0:00:00
修稿时间:2006-10-122007-03-08

Changes of Infiltration Characteristics of Abandoned Cropland with Plant Restoration in Loess Hilly Region
BO Hai-feng,LIU Guo-bin and WANG Guo-liang.Changes of Infiltration Characteristics of Abandoned Cropland with Plant Restoration in Loess Hilly Region[J].Bulletin of Soil and Water Conservation,2007,27(3):1-5,31.
Authors:BO Hai-feng  LIU Guo-bin and WANG Guo-liang
Institution:Northwest Sci-Tech University of Agriculture & Forestory,Yangling,Shaanxi 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,China
Abstract:Based on the space-for-time method,the 1,4 and 8-year plant communities of abandoned cropland were selected to investigate infiltration process and characteristics using Disc infiltrometer(Z-700).One artificial community(Cargana korshinkii) and one natural community(Sophora davidii) were chosen as control.We found that:(1) stable infiltration rate under Sophora davidii communities was less than that under Cargana korshinkii communities.It may relate with soil perturbation and the higher root biomass of artificial Cargana korshinkii.(2) The average infiltration rate and saturated hydraulic conductivity of abandoned cropland were increased with theabandoned time.Soil saturated hydraulic conductivities(SHC) of 1,4 and 8-year abandoned croplands were 52%,74% and 98% of the SHC under nature Sophora davidii communities respectively,while stable infiltration rates of 1,4 and 8-year abandoned cropland were 57%,88% and 91%.It indicated that infiltration rate increased with plant restoration.(3) Soil infiltration characteristics were influenced by soil physical and chemical properties,such as soil porosity,bulk density,texture,compaction,moisture and organic matter content.With plant restoration,plant can generate a large amount of root.
Keywords:the Loess Plateau  plant restoration  infiltration  saturated hydraulic conductivity
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