中国西部地区耕地土壤盐渍化评估及发展趋势预测

本文对近50年来中国西部耕地土壤盐渍化发展变化做出评估，老耕地盐渍化在减轻，新垦耕地盐渍化在发展，总体处于动态平衡。盐渍化耕地的水盐动态变化，实现稳定脱盐的是局部，持续积盐的也是局部，大部分耕地是脱盐不稳定或脱盐积盐反复型，因而土壤盐渍化的潜在危害仍很大。根据土壤盐渍化与水利建设和灌溉水平之间的关系，以新疆为例，用类比法对今后发展变化作了预测，同时还研究了全球气候变化对土壤盐渍化的可能影响。

ASSESSMENT AND PREDICTION OF DEVELOPING TREND OF SOIL SALINIZATION OF THE CULTIVATED LAND IN WEST CHINA

This paper assesses the development and the change of soil salinization of the cultivated land in west China since recent 50 years. The results show that the degree of soil salinization is reducing in the old cultivated land but it is becoming more serious in the newly reclaimed cultivated land, and overall it is in a dynamic equilibrium. In the aspect of water salt dynamic change of the salinized cultivated land, local cultivated land has been steadily desalinized, the continuous salt accumulation occurs in local cultivated land, and most of the cultivated land is in an unsteady desalinization or a reversal of desalinization and salt accumulation. Therefore, the potential harmfulness of soil salinization is still heavy. According to the relationship between soil salinization, construction of irrigation works and irrigation level, a case study on forecast of the developing trend of soil salinization in Xinjiang is carried out by using analogism, and the possible impacts of global climate change to soil salinization are also researched.