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宁南黄土丘陵区不同植被措施的土壤水分特征
引用本文:杨永辉,赵世伟,刘娜娜,吴金水,苏静,徐洁.宁南黄土丘陵区不同植被措施的土壤水分特征[J].中国水土保持科学,2006,4(2):24-28.
作者姓名:杨永辉  赵世伟  刘娜娜  吴金水  苏静  徐洁
作者单位:1. 中国科学院,水利部,水土保持研究所,712100,陕西杨凌;中国科学院研究生院,100039,北京
2. 中国科学院,水利部,水土保持研究所,712100,陕西杨凌
3. 西北农林科技大学资源环境学院,712100,陕西杨凌
4. 中国科学院亚热带农业生态研究所,410125,长沙
5. 宁夏彭阳县水保站,756500,宁夏,彭阳
基金项目:国家科技攻关项目;中国科学院知识创新工程项目
摘    要: 为阐明宁南黄土丘陵区不同植被措施与土壤水分特征之间的关系,应用离心机法及定水头法分别测定土壤的水分特征曲线及土壤饱和导水率,研究该地区植被措施下土壤的水分特征。结果表明:土壤含水量与土壤水吸力之间的关系符合幂函数θ=aSb,且相关水平达极显著。参数a的大小与不同植被有一定的关系,且呈现出有规律的变化,苜蓿>沙棘>天然草>杏树>柠条>农田。土壤饱和导水率天然草与苜蓿最高,农田最低,沙棘、柠条等灌木林地居中。在同一吸力范围内,苜蓿的含水量最高,沙棘次之,天然草、柠条及杏树含水量基本相同,农田最低。在低吸力段土壤平均含水量为苜蓿>沙棘>农田>天然草>杏树>柠条,但除苜蓿及沙棘外,农田、天然草、杏树及柠条差异不大。在中吸力阶段,平均土壤含水量苜蓿>天然草>杏树,且苜蓿相对较高,随着土壤吸力的增大,土壤含水量差异逐渐缩小。凋萎含水量除苜蓿最大,其次为沙棘和天然草,柠条、杏树次之,农田最低。

关 键 词:黄土丘陵区  植被措施  土壤水分特征
收稿时间:2005-07-05
修稿时间:2005-11-10

Soil moisture characteristics of different vegetation measures in loess hilly region of southern Ningxia
Yang Yonghui,Zhao Shiwei,Liu Nana,Wu Jinshui,Su Jing,Xu Jie.Soil moisture characteristics of different vegetation measures in loess hilly region of southern Ningxia[J].Science of Soil and Water Conservation,2006,4(2):24-28.
Authors:Yang Yonghui  Zhao Shiwei  Liu Nana  Wu Jinshui  Su Jing  Xu Jie
Institution:1.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,712100,Yangling,Shaanxi;2.Graduate School of the Chinese Academy of Sciences,100039,Beijing;3.College of Resources and Environment of Northwest Sci-Tech University of Agriculture and Forestry,712100,Yangling,Shaanxi;4.The Institute of Subtropical Agriculture,Chinese Academy of Sciences,410125,Changsha;5.Pengyang county Bureau of Water Conservancy in Ningxia,756500,Pengyang,Ningxia:China
Abstract:In order to illustrate the relation between artificial vegetation and soil moisture characteristics in loess hilly region of Ningxia,the centrifugation method and invariable water height method were used for measuring the curve of soil moisture characteristics and saturated hydraulic conductivity of soil,and the soil moisture characteristics of sloping land in loess hilly region of southern Ningxia were studied.The results showed that there was high power function correlation between the soil moisture and the potential of soil water.The mathematical model was θ=aSb.The value a and different sloping land were ranged in order from higher ones to lower ones as follow: Medicago lupulina,Hippophae rhamnoides,Natural Grassland,Prunus armeniaca,Caragana korshinskii,farmland.Grassland,Shrubbery,Arbor Forest,cropland.Saturated hydraulic conductivity of Natural Grassland and Medicago lupulina were the highest than the others,and cropland was the lowest,and Grassland,Hippophae rhamnoides and Caragana korshinskii were middle.At the same soil water potential range,soil water content of Medicago lupulina was highest,Hippophae rhamnoides took second place,cropland was the lowest and others' were around the same.At the low potential range,the average soil water content,from high to low,was Medicago lupulina,Natural Grassland,Cropland,Natural Grassland,Prunus armeniaca,Caragana korshinskii.At the middling soil potential range,the order of average soil water content was Medicago lupulina > Natural Grassland > Prunus armeniaca,and with the soil suction increasing,soil water content changed little.Languishing soil water content of vegetations except Medicago lupulina was still highest,and cropland kept was lowest.
Keywords:loess hilly region  vegetation measures  soil moisture characteristics  
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