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黄淮海平原地势低平、光热充足,降水年内年际分配不均,这里的农业生产长期受着旱、涝、盐碱、风等自然灾害的威胁。旱涝盐碱受区域性农田水分所支配和水盐运动的影响。黄淮海平原的农田水分状况属降水-蒸发型,常年参加该平原水分循环的水量中,七分来自当地降水,三分来自周围山区的客水;这些水分四分之三以蒸发的形式排出,四分之一由黄河、淮河、海河和滦河流入海洋。因此,要掌握黄淮海平原旱涝盐碱发生和发展趋势,制订趋利避害对策,必须首先研究和掌握农田水分平衡中的主要因素-降
Huanghuaihai Plain low level, sufficient light and heat, rainfall year-to-year distribution of uneven, where the long-term agricultural production by drought, waterlogging, saline, wind and other natural disasters. Drought / Flood Salinity is Controlled by Regional Farmland Moisture and Effects of Water and Salt Movement. Huanghuaihai Plain farmland water status is precipitation - evaporation type, perennial participation in the plain water cycle of water, seven from the local precipitation, one third from the surrounding mountain waters; these three-fourths of the water in the form of evaporation, A quarter of the Yellow River, Huaihe River, Haihe River and Luanhe into the ocean. Therefore, in order to grasp the occurrence and development trend of droughts, floods, salinity and alkalinity in the Huang-Huai-Hai Plain, and formulate the strategies of avoiding disadvantages, we must first study and master the main factors of the farmland moisture balance-