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硬覆盖对土壤水热传输及作物生长发育影响的试验研究 被引量:7
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作者 毛学森 曾江海 《生态学杂志》 CAS CSCD 北大核心 2000年第2期68-71,共4页
Effects of the concrete mulch on evaporation, transpiration, evaportranspiration, soil temperature, yield of cotton and corn,and water use efficiency were studied by field experiments. The results showed that the conc... Effects of the concrete mulch on evaporation, transpiration, evaportranspiration, soil temperature, yield of cotton and corn,and water use efficiency were studied by field experiments. The results showed that the concrete mulch cover effectively increased transpiration, yield and water use efficiency and greatly reduced soil evaporation loss and the amplitude of daily and seasonally soil temperature, water content variations. 展开更多
关键词 作物生长发育 覆盖保墒 水泥硬壳 土壤传输
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青藏高原那曲地区非均质土壤导温率的变化及土壤温度数值模拟 被引量:12
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作者 王可丽 程国栋 +1 位作者 江畅畅 牛富俊 《冰川冻土》 CSCD 北大核心 2007年第3期470-474,共5页
土壤中的热传输是地-气能量交换的组成部分,而非均质土壤导温率/导热率的获得是研究土壤热传输过程中的一个难点,是至今仍未很好解决的问题.分析了一维热传导方程在非均质土壤条件下的适用形式,利用青藏高原那曲站实测土壤温度资料,计... 土壤中的热传输是地-气能量交换的组成部分,而非均质土壤导温率/导热率的获得是研究土壤热传输过程中的一个难点,是至今仍未很好解决的问题.分析了一维热传导方程在非均质土壤条件下的适用形式,利用青藏高原那曲站实测土壤温度资料,计算了非均质土壤导温率,计算结果表明,土壤导温率有明显的随深度和季节的变化.利用考虑非均质土壤导温率参数的土壤温度数值模式,对那曲地区各层土壤温度的年变化进行了模拟试验,模拟结果显示,按冷季和暖季分别采用两组不同的土壤导温率,对土壤温度的年变化已有较好的模拟效果. 展开更多
关键词 青藏高原 土壤导温率 土壤温度 土壤热传输
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基于微波遥感参数估算区域蒸散发的方法研究 被引量:10
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作者 张堂堂 文军 +3 位作者 李振朝 田辉 刘蓉 席家驹 《高原气象》 CSCD 北大核心 2013年第6期1651-1657,共7页
利用主动微波遥感资料(ENVISAT/ASAR)估算的表层土壤湿度和光学遥感资料(EOS/MODIS)的地表温度信息,结合气象站常规观测的气象要素,利用土壤水热耦合及水分蒸发模型对黄土高原典型塬区进行了蒸散发量的估算。将估算的蒸散发量与实际观... 利用主动微波遥感资料(ENVISAT/ASAR)估算的表层土壤湿度和光学遥感资料(EOS/MODIS)的地表温度信息,结合气象站常规观测的气象要素,利用土壤水热耦合及水分蒸发模型对黄土高原典型塬区进行了蒸散发量的估算。将估算的蒸散发量与实际观测对比表明,两者之间绝对误差最大为117W·m-2,最小为0.6W·m-2,平均为24W·m-2。基于微波遥感参数估算蒸散发量的方法为估算区域蒸散发量提供了一种新的思路。 展开更多
关键词 微波遥感 土壤传输 区域蒸散发 黄土高原
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A soil water and heat transfer model including changes in soil frost and thaw fronts 被引量:5
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作者 WANG AiWen XIE ZhengHui +2 位作者 FENG XiaoBing TIAN XiangJun QIN PeiHua 《Science China Earth Sciences》 SCIE EI CAS 2014年第6期1325-1339,共15页
Freeze-thaw processes in soils,including changes in frost and thaw fronts(FTFs),are important physical processes.The movement of FTFs affects soil hydrothermal characteristics,as well as energy and water exchanges bet... Freeze-thaw processes in soils,including changes in frost and thaw fronts(FTFs),are important physical processes.The movement of FTFs affects soil hydrothermal characteristics,as well as energy and water exchanges between the land surface and the atmosphere and hydrothermal processes in the land surface.This paper reduces the issue of soil freezing and thawing to a multiple moving-boundary problem and develops a soil water and heat transfer model which considers the effects of FTF on soil hydrothermal processes.A local adaptive variable-grid method is used to discretize the model.Sensitivity tests based on the hierarchical structure of the Community Land Model(CLM)show that multiple FTFs can be continuously tracked,which overcomes the difficulties of isotherms that cannot simultaneously simulate multiple FTFs in the same soil layer.The local adaptive variable-grid method is stable and offers computational efficiency several times greater than the high-resolution case.The simulated FTF depths,soil temperatures,and soil moisture values fit well with the observed data,which further demonstrates the potential application of this simulation to the land-surface process model. 展开更多
关键词 soil frost and thaw fronts soil water and heat transfer model moving-boundary problems
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