Flow dynamics in vadose zones with and without vegetation in an arid region
Flow dynamics in vadose zones with and without vegetation in an arid region
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干旱地区有植被和无植被的包气带的流动动力学
DOI：
10.1016/j.advwatres.2017.03.011
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发表时间：
2017-08
期刊：
影响因子：
--
通讯作者：
Jet-Chau Wen
中科院分区：
文献类型：
--
作者：
Wenke Wang;Zaiyong Zhang;Tian-chyi Jim Yeh;Gang Qiao;Wenmin Wang;Lei Duan;Shao-Yang Huang;Jet-Chau Wen
通过野外试验，研究了干旱区厚层包气带中的水流动力学特征。详细的压力头剖面沿着深度为8米，地下水位，土壤水分含量在表面，空气温度和降水量进行了观察超过一年的时间跨度。时间跨度上的时间和空间变化的压力头和水力梯度阐明了空气温度，降水，土壤分层，植被的生长，在包气带的流动动力学的作用。动态包括冻结和融化的表层土壤，渗透，蒸散，水分分布，地下水补给。估计水力梯度的基础上观察到的压头表明，植被影响流动动力学，即使在3米以下的土地表面在其生长季节。在包气带的压力头分布在时间跨度被发现相关以及与土壤分层或异质性。在此基础上，估算了该地区陆-气界面通量、植物吸水速率，并讨论了温度、降水、蒸发、植物生长、土壤分层（非均匀性）等季节变化与包气带水流动力学的关系。
Flow dynamics in a thick vadose zone in an arid region, China was investigated using a field experiment at plots with bare soils and vegetated soils. Detailed pressure head profile along a depth of 8 m, groundwater level, soil moisture content at surface, air temperature, and precipitation were observed over one year's time span. The temporal and spatial variations of pressure heads and hydraulic gradients over the time span elucidate the role of air temperature, precipitation, and soil stratification, the growth of vegetation, on the flow dynamics in the vadose zone. The dynamics includes freezing and thawing of surface soils, infiltration, evapotranspiration, distribution of moisture, and groundwater recharge. Estimated hydraulic gradients based on the observed pressure heads suggest that vegetation affected flow dynamics even at 3 m below land surface during its growth seasons. The pressure head distributions at the vadose zone over the time span were found correlated well with soil stratification or heterogeneity. Afterward, we estimated the land-atmosphere interface flux, water uptake rate by the plants, and we then discussed the relationship between seasonal variation of temperature, precipitation, evaporation, plant growth, soil stratification (heterogeneity) and the flow dynamics in the vadose zone of the region.
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DOI：
10.1017/cbo9781139879323
发表时间：
2015-07
期刊：
--
影响因子：
--
作者：
T. Yeh;R. Khaleel;K. Carroll
通讯作者：
T. Yeh;R. Khaleel;K. Carroll
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影响因子：
4.6
作者：
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DOI：
10.1111/gwat.12420
发表时间：
2016-05
期刊：
Ground Water
影响因子：
--
作者：
M. Cardiff
通讯作者：
M. Cardiff
影响因子：
4.7
作者：
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通讯作者：
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影响因子：
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作者：
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