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盐碱地一般是指盐土和碱土的统称。碱土中含有大量代换性钠,呈强碱性反应;盐土中含有大量可溶性盐类。我国有盐碱地面积3亿多亩,盐碱土分布于平原和盆地中,地形平坦、土层深厚、适宜机耕、具有潜在肥力,一经改良,就可成为可利用的土地资源。一、植树造林是生物改良盐碱土的有效措施1.降低地下水位地下水位过高是形成盐碱土的基本原因之一。利用林木根系不断从土壤中吸收大量水分,再通过枝叶的蒸腾作用散发到大气中去,起到了生物排水作用,降低了地下水位。
Saline soil generally refers to salt and alkaline earth collectively. Alkaline soil contains a large number of substitutional sodium, was a strong alkaline reaction; saline soil contains a large number of soluble salts. China has a saline-alkali land area of over 300 million mu. Saline-alkaline soil is distributed in the plains and basins. The terrain is flat and the soil is deep and suitable for tillage with potential fertility. Once it is improved, it can become an available land resource. First, afforestation is an effective measure to improve saline-alkali soil 1. To reduce the groundwater level Groundwater level is one of the basic reasons for the formation of saline-alkali soil. The use of forest roots constantly absorb large amounts of water from the soil, and then through the transpiration of leaves and leaves distributed to the atmosphere, played a biological drainage, reducing the water table.