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一、盐渍化耕地的地下水临界深度问题 地下水临界深度与排水标准无疑是两回事情。前者基本是自然现象,后者则是根据生产的需要和临界深度的制约而人为的标准。但的确有时两者混淆不清,应该予以明确。 地下水临界深度一向是研究盐渍化形成原因和盐渍化防治措施的重要课题之一。通常认为,从理论上讲,地下水临界深度是地下水毛细管上升高度加作物根系活动层的厚度,或认为地下水最大蒸发深度即土壤不积盐的地下水埋深,即所谓“极限埋深”。这个深度实
First, the critical depth of salinized arable land groundwater The critical depth of groundwater and drainage standards is undoubtedly two different things. The former is basically a natural phenomenon, while the latter is a man-made standard based on the needs of production and the critical depth. But sometimes the two are confused and should be clarified. The critical depth of groundwater has always been one of the important topics for studying the causes of salinization and the prevention and treatment of salinization. Theoretically speaking, the critical depth of groundwater is theoretically the capillary rise of groundwater plus the thickness of the active layer of crop roots, or the groundwater depth, which is the maximum evaporation depth of groundwater, that is, the soil does not accumulate salt, the so-called “limit depth.” This depth is real