日照茶树种植区土壤pH值及养分的变化

在GIS支持下,通过对日照市茶树种植区1982年和2003年土壤养分的对比分析,探讨了茶树种植对土壤养分的影响.2003年在研究区采集104个土壤剖面点,对土壤的主要养分进行了分析.在ARCGIS下进行Kriging插值形成各养分分布图,然后对照1982年第2次土壤普查结果进行各养分的差值分析.结果显示,茶树种植20a,土壤全N、有效P、速效K有增加的趋势,且明显高于非茶树种植区.土壤有机质基本不变或略有下降,但茶树种植区高于非种植区.全市土壤pH值有下降趋势,但茶树种植区下降较大,幅度在0.83～1.98之间.

Change of pH value and nutrient of soil in Rizhao tea-planting

This paper aims to report the authors' comparison and analysis of the change of the main soil nutrient ingredients (total N, available P, available K, and the organic matters concerned) and pH value of 1982 and 2003 based on GIS. Through our analysis, it has been found the obvious influence of the tea planting on soil quality change. In accordance with the 104 profiles of the soil collected by the authors in 2003 and by using the Kriging method, it was found that, in comparison with the second soil survey in 1982, tea-tree planting is favorable for the improvement of the main soil nutrients. Based on the ARCGIS soil nutrient distribution map, the following results have been established that planting the tea tree can obviously improve soil quality and land fertility, thus being favorable for the soil-fertility cultivation. After over 20 years' tea planting, the content of total N, available P and available K with the tea planting areas proves to have increased as compare with non-tea planting areas. However, The organic content in the tea-planting pots remains un changed or slightly decreased, though it proves still higher than the non-tea planting pots. At the same time, the soil pH has decreased apparently and turned up to be acidated, especially in some old tea planting areas, the rate of such decrease is worked out within the range from 0.84 to 1.98.