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《Journal of Glaciology and Geocryology》 1981-03
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CHANGES OF GROUND WATER AT THE FORWARD FARMS OF DUNES IN SEASONAL FROZEN GROUND AREA AND THEIR INFLUENCE ON AGRICULTURE

Wang Jixin (Water conservancy society , Fuxin County , Liaonin9 Province)  
Due to specific natural conditions and seasonal freezing in the seasonal frozen ground area , the changes of ground water there at the forward farms of dunes are not only dependent on amount of precipitation , but there are also two peaks of ground water formed by rainwater seepage or freezing . The movement of ground water in a year could be divided into four stages : stage of falling due to inward sluicing , stage of rising due to infiltration , stage of falling due to drainage, and stage of rising due to emergence at freezing. And the peak at the freezing of ground water has a greater strength than that at rainwater infiltration . The redistribution of water and the rising of water in winter in the process of freezing cause the water content of soil reach a state of oversa-turation , thus the spring sowing must be carried out in the time when the frozen layer is thoroughly melted. Once heavy rain comes ahead of time , or early frost, low temperature and cold damage happen , drop in agricultural production would naturally follow . Rising of ground water would naturally impoverish the soil , causing secondary salinization of it . Realizing the requirement of ground water level restriction at different seasons and applying "blocking" "draining" or "regulating" measures through comprehensive engineering of underground drainage pipe , damage of waterlogging at the forward farms of dunes could be prevented .
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Chinese Journal Full-text Database 2 Hits
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【Co-references】
Chinese Journal Full-text Database 10 Hits
1 Ji Zixiu ( Nanjing Institute of Geography, Academia Sinica );THE MODERN PERIGLACIAL PROCESS IN THE CENTRAL PART OF TIAN SHAN[J];Journal of Glaciology and Geocryology;1980-03
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