疏勒河源区含砂砾石土壤水热实验  

Hydraulic and thermal experiment of soil with gravel in the source region of Shule River

作　　者：何玉洁 宜树华[2,3] 陈建军 秦彧 HE Yujie;YI Shuhua;CHEN Jianjun;QIN Yu(Chinese llrsrarch Academy of Environmental Scieru rs,100012,Beijing,China;Nantong University,226007,Nantong.Jiiingsu,China;Northwest Institute of Eco-Environmen and Resources,Chinese Academy of Sciences,730000,Lanzhou,China;College of Geomatics and Geoinformation,Guilin University of Technology,541004,Guilin,China)

机构地区：[1]中国环境科学研究院,北京100012 [2]南通大学,江苏南通226007 [3]中国科学院西北生态环境资源研究院,兰州730000 [4]桂林理工大学测绘地理信息学院,广西桂林541004

出　　处：《中国水土保持科学》2019年第3期48-56,共9页Science of Soil and Water Conservation

基　　金：国家重点基础研究发展计划(973计划)“冻土对气候变化响应机制”(2010CB951402);国家自然科学基金“全球变化背景下青藏高原多年冻土退化对高寒草地的影响研究”(41271089)

摘　　要：对疏勒河源区的翻耕补播地、围栏封育地和围栏外草地这3种砂砾石含量不同的草地为研究对象,对其饱和导水率、冻融状态下的导热率进行测定,分析了饱和导水率、导热率与不同样地、土层深度、及土壤物理性质的关系。结果表明:1)3种样地不同土层的砂砾石含量有较大差异,翻耕补播地100~160 cm砂砾石含量达到73%。2)土壤饱和导水率和导热率随着样地类型和土层深度的不同而变化,疏勒河源区上游高寒草地饱和导水率和导热率具有空间异质性。3)砂砾石含量对饱和导水率和导热率有显著影响,今后的研究中需考虑砂砾石对土壤水热属性的影响。[Background]The Qinghai-Tibetan Plateau( QTP) is sensitive to climate change and human disturbance. There is large amount of gravel in the soil of the QTP due to the weak chemical and biological processes. However,few attentions have been paid to the thermal and hydraulic properties of soil with gravel. Gravel in soil affects soil composition,water content,soil bulk density,soil thermal conductivity and other soil properties. The study on hydrothermal properties of gravel was few. The widely used parameterization schemes of soil water and thermal properties only considers the sandy,silt and clay soil,the understanding of the importance of gravel is not enough. [Methods]According to the different content of gravel in soil,three types of grassland were selected as the research object. In each type,three plots were selected,totally 9 plots. A 1. 6 m deep soil profile was dug in each plot. Each profile was divided into four layers,namely: 0-20,20-40,60-100,and 100-160 cm. Soil samples were taken from each soil layer and brought to the laboratory. The saturated hydraulic conductivity of soil samples was measured by constant-head permeameter and variable-head permeameter in the laboratory. The thermal conductivity of soil samples in the study area was analyzed by thermal characteristic analyzer( KD2 Pro,DECAGON,USA). The relationship between saturated hydraulic conductivity,thermal conductivity and gravel content was analyzed by origin software. and the significance was tested by SPSS.[Results]The saturated hydraulic conductivity increases sharply when the content of gravel is more than60%. The saturated hydraulic conductivity reaches 1. 5 cm/s when the content of gravel reaches 80%.Saturated hydraulic conductivity of tillage and supplementary sowing land increases with the increase of gravel content. For all soil layers,the thermal conductivity is basically the same under two conditions when the soil moisture is zero. The thermal conductivity of frozen soil is lower than that of unfrozen soil.With the increase of soil

关 键 词：饱和导水率 导热率 砂砾石 疏勒河源区 

分 类 号：S151[农业科学—土壤学]