摘要
研究高寒地区土壤饱和导水率分布特征及其影响因素可为评估脆弱生态系统水源涵养能力和构建区域水文模型提供参数。通过测定青海省东部南北样线24个样点(0—30 cm)土壤基本理化性质和饱和导水率(K_(s)),分析了不同土地利用方式下K_(s)分布特征及其影响因素。结果表明:K_(s)均值表现为林地(1.89 cm/h)>草地(1.62 cm/h)>农地(1.4110 cm/h),其中农地K_(s)(0.10~3.92 cm/h)随着土层深度增加逐渐减小,而林地(0.28~7.69 cm/h)和草地K_(s)(0.10~5.34 cm/h)随土层深度增加表现为先增加后减小。不同利用方式下K_(s)均与pH、容重、孔隙度、黏粒含量、有机质含量及饱和含水量显著相关(P<0.05)。利用多元回归分析获得了农地以总孔隙度、非毛管孔隙度和饱和含水量为输入因子的K_(s)传递函数,林地以毛管孔隙度和非毛管孔隙度为输入因子的K_(s)传递函数和草地以容重、非毛管孔隙度和饱和含水量为输入因子的K_(s)传递函数。研究结果可为其他高寒地区不同土地利用方式下K_(s)的模拟和预测提供参考。
The investigation of soil saturated hydraulic conductivity and its influencing factors in the alpine region is critical for evaluating water conservation capacity of the fragile ecosystem and constructing regional hydrological modeling.The distribution and influencing factors of soil saturated hydraulic conductivity(K_(s))under different land use patterns were studied by measuring soil physicochemical properties and K_(s) in the 0-30 cm soil layers along a north-south transect in the Eastern part of Qinghai Province.The results showed that the average value of K_(s) followed the decreasing order of forestland(1.89 cm/h)>grassland(1.62 cm/h)>farmland(1.41 cm/h).The K_(s) of farmland(0.10~3.92 cm/h)decreased gradually with the increasing of soil depth,while K_(s) of forestland(0.28~7.69 cm/h)and grass(0.10~5.34 cm/h)land increased first and then decreased with the increasing of soil depth.K_(s) was significantly correlated with soil physical and chemical properties such as pH,bulk density,porosity,clay content,organic matter content and saturated water content(P<0.05).The multiple regression analysis showed that the K_(s) pedo-transfer function equations of farmland was obtained using total porosity,non-capillary porosity and saturated water content as input parameters,the K_(s) pedo-transfer function equation of forestland was obtained by using capillary porosity and non-capillary porosity as input parameters,and the K_(s) pedo-transfer function equation of grassland was obtained by using bulk density,non-capillary porosity and saturated water content as input parameters.The results could provide reference for the simulation and prediction of K_(s) under different land use patterns in other alpine regions.
作者
王紫薇
邵明安
黄来明
裴艳武
李荣磊
WANG Ziwei;SHAO Ming’an;HUANG Laiming;PEI Yanwu;LI Ronglei(College of Natural Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100;Key Laboratory of Ecosystem Network Observation and Modeling,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101;State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Chinese Academy of Sciences,Yangling,Shaanxi 712100;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049)
出处
《水土保持学报》
CSCD
北大核心
2021年第3期150-155,共6页
Journal of Soil and Water Conservation
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0306)
中国科学院青年创新促进会会员项目(2019052)
中国科学院地理科学与资源研究所秉维优秀青年人才项目(2017RC203)
中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金项目(A314021402-2010)。
关键词
高寒地区
土地利用方式
饱和导水率
影响因素
土壤传递函数
alpine region
land use pattern
saturated hydraulic conductivity
influencing factors
pedo-transfer function equation
