GSPAC water movement by greenhouse method in the extremely dry area
GSPAC water movement by greenhouse method in the extremely dry area
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发表时间：
2010
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通讯作者：
Li Hongshou;Wang Wanfu;Zhang Guobin;Zhang Zhengmo;Wang Xiaowei
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作者：
Li Hongshou;Wang Wanfu;Zhang Guobin;Zhang Zhengmo;Wang Xiaowei
在典型的极端干旱气候条件下，在戈壁莫高窟顶建造PVC大棚，连续235天抽取大棚膜上的冷凝水，通过监测土壤含水量，m-2·d-1，1地下水从地下水埋深超过200 m的极端干旱地区的温室土壤中向上运移并输出，经过长期的输出，土壤含水量不仅没有降低，反而明显高于治理前，通过对林内外土壤空气相对湿度、绝对湿度、温度等要素的监测，发现地下水继续运移的条件和机制是存在的，由此判断，在潜水埋藏较深的极端干旱地区，潜水是存在蒸发的，潜水是土壤水分的重要来源，通过土壤的“呼吸”作用，土壤盐分对土壤水分运动及其非均匀性的时空分布有重要影响，极端干旱的气候、地热和上层土壤温度变化是GSPAC水分运移和潜水蒸发的根本原因。
In typically and extremely dry climate condition,a PVC greenhouse-canopy was built on Mogao Grottoes' roof on a gobi.After 235 days' continuously extracting out of condensation water from the film of the greenhouse,and through monitoring soil water content,it was found that there were 2.1 g·m-2·d-1 groundwater being moved up and exported from the greenhouse soil in the extreme dry area where groundwater was more than 200 m deep.After long-term exporting water,the soil water content was not getting lower,instead,it was obviously higher than that before it being controlled and coved.From monitoring these elements,such as soil air RH,absolute humidity and temperature inside and outside the canopy,it was discovered that the condition and mechanism of groundwater continuing moving up was existed,and the possibilities of water inside the greenhouse coming from outside soil and atmosphere could be debarred.By these judgment,in the extremely dry areas where the phreatic water was buried deeply,its evaporation is existed.The phreatic water is soil moisture's important source.Through soil's "respiration",the moisture exchanging between soil and atmosphere is kept.Soil salinity has important effects on soil moisture movement and spatio-temporal distribution of its heterogeneity.The extremely dry climate,terrestrial heat and upper soil's temperature change are an ultimate reason why GSPAC's moisture transportation and phreatic water's evaporation are taken place.