Soil Physicochemical Properties of Cultivated Land in Different Farming Years in Korqin Sand Land

Abstract

Naiman County is the typical area in Korqin sand land. Chose cultivated land in Naiman County, this article carried on comparative analysis for soil physicochemical properties of cultivated land in different farming years. This included change characteristics of soil physicochemical properties with different farming years in different slope positions (windward slope, sloping top and leeward slope) of cultivated land and quantitative analysis between farming years and soil physicochemical properties. The results showed that: (1) there were different changes in soil texture in different slope positions of cultivated land in different farming years: at first 15 years, in the windward slope, the soil texture emerged good trend year by year, but after 30 years of farming, the soil texture get significantly worse. In the sloping top and leeward slope, the soil texture was changed for the better trend along with the increase of farming years. (2)There were different changes in soil nutrients in different slope positions of cultivated land during different farming years: in the windward slope, farmed from 3 years to 15 years, upward trend showed among the most nutrients and until 30 years, it obviously reduced and drop back to level of the 3 years; There was a rising trend in the leeward part of the nutrients; sloping top was between the middle and more indicators decline in nutrient content than that of increasing. (3) There was relationship between the farming years and soil physicochemical properties: the effects on soil texture was higher than the soil nutrients and correlation between different slope positions was different: in the windward slope, farming years correlated positively with sand and available P and a negative correlation was found between farming years and other indicators. In the sloping top, farming years correlated negatively with sand, total N, total K, alkaline N and available P, correlated positively with other indicators. In the leeward slope, farming years correlated negatively only with sand and total K, correlated positively with all of other indicators.