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黄土高原农田水量平衡研究 预览 被引量:26

Study on Field Water Balance of Loess Plateau
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摘要 黄土高原由北向南顺序分布有沙壤带、轻壤带、中壤带和重壤带;2m土层最大持水容量约相当于各自所处地区的年降水量;2m土层有效持水容量约相当于各自作物耗水量的70%以上。 The sand,light,medium,and heavy loam are distributed over Ioess Plateau from northto south,The maximum water capacity in 2m sod depth approximately equals to the annual precipi-tation of each region ,and the maximum available water capacity is over 70%of water consumptionof crop in each region. In Loess Plateau,the main water resource is precipitation,and main waterexpenditure is evaporation and plant transpiration. The gigantic soil reservoir can receive all of rain-fall and reserve it within soil zone of plant absorption. About 70%一80%of water is used in evapo-transpiration during growth peried. and about 20%一30%is wasted due to soil evaporation duringnon-growth peried. The water consumption(Millet,Potato)in northern region is ahout 300mm,andin the southern regin(winter wheat,spring corn)is ahaut 450mm。Rainy season is the most vio-lent season for bare soil evaporation. In northern region the evaporation amount accounts for 90%ofrainfall in rainy season,and in southern region accounts for 63%。The depth of water redistributionin soil varies from 1.0m to 2.5m from north to south,and the soil depth of water use by plant ismaiuly within 2m。
作者 李开元 李玉山 Li Kaiyuan Li Yushan(Northwestrn Institute of Soil and Water Conservation,Chinese Academy of Sciences &Ministry of Water Resources,Yangling,Shaanxi,712100)
出处 《水土保持学报》 CSCD 北大核心 1995年第2期 39-44,共6页 Journal of Soil and Water Conservation
基金 国家重点实验室基金
关键词 黄土高原 水量平衡 土壤水分 农田 Loess Plateau water balance soil water
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参考文献4

  • 1李开元,中国科学院西北水土保持研究所集刊,1991年,13期 被引量:1
  • 2李玉山,黄土高原农业与土壤,1989年 被引量:1
  • 3李玉山,中国科学院西北水土保持研究所集刊,1985年,2期 被引量:1
  • 4杨文治,土壤学报,1981年,18卷,1期 被引量:1

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