林草植被驱动下的土壤导水能力变化研究

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• 英文论文题名：Study of Soil Hydraulic Conductivity Changes Driven by Forest and Grass Vegetation
• 论文作者：徐学选 ; 张少妮 ; 华瑞 ; 陈文媛
• 英文论文作者：Xu Xuxuan ; Zhang Shaoni ; Hua Rui ; Chen Wenyuan ; Institute of Soil and Water Conservation ; Northwest A&F University
• 年：2015
• 作者机构：西北农林科技大学水土保持研究所;
• 论文关键词：恢复年限 ; 林草地 ; 土壤导水能力 ; 大孔隙数量 ; 黄土区
• 英文论文关键词：restoration years ; forest grassland ; soil hydraulic conductivity ; the number of soil macropores ; Loess Area
• 会议召开时间：2015-09-01
• 会议录名称：2015海峡两岸水土保持学术研讨会论文集（下）
• 英文会议录名称：Proceedings of Cross-strait Symposium on Soil and Water Conservation 2015
• 语种：中文
• 分类号：S714
• 学会代码：OGSJ
• 会议名称：2015海峡两岸水土保持学术研讨会
• 会议地点：中国山西太原
• 主办单位：中国水土保持学会、台湾中华水土保持学会
• 学会名称：中国水土保持学会
• 页数：6
• 文件大小：1792k
• 原文格式：O
• 会议级别：全国

摘要

本文选择甘肃省泾川县官山林场为研究区域,以林场中退耕25年、15年和9年的林地、草地为样地,使用圆盘入渗仪野外测定结合土壤水分特征曲线法研究林草植被不同恢复年限下土壤导水能力差异及其影响因素,结果表明:林草地植被恢复年限越久,其根系形成的土壤大孔隙越发育、土壤导水能力越强;草地0-20cm层导水能力优于林地,在20cm以下林地逐渐优于草地,对于相同退耕年限,草地入渗速率>林地入渗速率,随着年限增加差异减小。林、草地土壤孔隙中的大孔隙对导水能力起到决定作用,其中>0.5mm的大孔隙对饱和入渗率的贡献率可达70.92~91.58%。表明植被恢复进程中土壤水分循环能力在增强,提升了植被涵养水源作用。
This study was set in Guan Shan Forest Farm in Jingchuan County Gansu Province,and were chosen the restoration forest lands and grasslands for 25 years,15 years and 9 years as sample plots.The discinfiltration instrument was used to study the differences of soil hydraulic conductivity under different restoration years and influencing factors.The results are shown as follows:The longer restoration years of forest lands and grassland is the better soil macropores formed by roots develop and the higher the soil hydraulic conductivity.The hydraulic conductivity of 0-20 cm layer,the grass is better than the forest,and below the 20 cm the forest is gradually better than grass.For the same year of restoration,the infiltration rate of grassland > the infiltration rate of woodland,the differences reduced with the year increased.Among the soil pores,the macropores have a decisive role in the soil hydraulic conductivity,and the contribution rate of the 0.5mm soil macropores to the saturated infiltration rate is 70.92~91.58%.It is indicated that the soil water cycling ability is enhanced in the process of vegetation restoration,meanwhile,the effect of vegetation conserving water is raised.

引文

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