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以地处经济高速发展区的张家港市为例,进行了土壤肥力质量演变的系统评价。结果表明,采取基于综合评价与功能评价相结合的土壤质量评价方法,不但可以了解土壤肥力综合质量演变状况,而且还可以把握研究区土壤质量演变过程中存在的主要问题。综合评价结果显示,自1980年以来,经过24年的耕作,张家港市土壤质量呈现上升的动态演变趋势,雏形土二、三等地面积提高,四等地所占比例降低,人为土二等地面积提高,三、四等地比例降低,并出现一等地。功能性评价结果表明,肥力保证功能和大量养分供应功能的提高是雏形土质量提高的原因,而肥力保证功能的提高是人为土质量提高的主要原因,微量营养的变化对研究区土壤质量的提高贡献较小。雏形土较人为土具有更高的质量提高的余地。雏形土钾素的亏缺、人为土明显酸化和全磷的降低,以及两种土壤有效Cu的超标和有效Zn和B的短缺,是研究区土壤存在的主要问题。
Taking Zhangjiagang City located in a high-speed economic development zone as an example, a systematic evaluation of soil fertility quality evolution was carried out. The results show that adopting the method of soil quality evaluation based on the combination of comprehensive evaluation and functional evaluation can not only understand the evolution of integrated quality of soil fertility, but also grasp the main problems in the evolution of soil quality in the study area. The comprehensive evaluation shows that since 1980, after 24 years of tillage, the soil quality in Zhangjiagang City has shown a trend of dynamic evolution. The area of the second and third tiers of prototype soil has been raised, the proportion of the fourth grade land has been reduced, Area increased, the proportion of three, four and other lower, and there first class. The results of functional evaluation showed that the enhancement of fertility assurance function and large amount of nutrient supply function was the reason for the improvement of soil quality, while the improvement of fertility assurance was the main reason for the improvement of artificial soil quality. The change of micronutrients had an effect on the improvement of soil quality in the study area Contribution is smaller. Rudimentary soil is more man-made soil with higher quality room for improvement. The deficiency of soil potassium, the obvious acidification of man-made soil and the decrease of total phosphorus, as well as the excessive Cu available in both soils and the shortage of available Zn and B, were the main problems in soils in the study area.