土壤水分对植物生长发育、土壤形成、热量平衡、坡面迳流、潜水变化,溶质迁移等都有影响,与农、林、水利、道路工程有密切关系,为了认识和控制土壤水分,必须知道它的消、长规律。农田水量平衡是一定时段内水分加入、移出或贮存于一段土体中的情况。短时段内的水量平衡资料,对掌握土壤水对植物的可给量和有效度,因而对农田的合理供水灌溉,尤有实用价值,本文主要针对这一方面落笔。 Soil moisture has an impact on plant growth and development, soil formation, heat balance, slope flow, submerged changes, solute transport, etc., and is closely related to agriculture, forestry, water conservancy and road engineering. In order to understand and control soil moisture, it is necessary to know Its elimination, long rules. Farmland water balance is a period of time to join, remove or store moisture in a section of soil. Short-period water balance data, to grasp the amount of soil water available to the plant and the validity, and thus the rational irrigation of farmland, especially of practical value, this paper is mainly aimed at this aspect.