关键词: 蔬菜地, 水稻田, 种植年限, 土壤养分, 养分变化规律

Abstract: [Objective] The objective of the study was to investigate soil nitrients in main vegetable bases of Xishuangbanna of Yunnan province, and to provide scientific theories for soil management of vegetable garden. [Method] The methods of field investigation and sampling were used in this study. [Results] ① In rice field, the values of soil pH and available nitrogen(N) declined smoothly with cultivation years but the indices of soil available phosphorus(P), available potassium(K) and organic matter(OM) increased. As a result, a balance tendency of soil nutrient appeared in rice field. ② In vegetable garden, the soil pH and OM decreased significantly with cultivation years. However, the contents of available N, P and K increased significantly. ③ The annual increase of available P was the most obvious, followed by available K and N in vegetable garden. This phenomenon resulted in a soil nutrient imbalance. [Conclusion] The content of soil organic matter decreased year by year but soil acidity, available N, P and K increased gradually in vegetable gardens, which could eventually lead to a imbalance of soil nutrient.

Key words: vegetable garden, rice field, cultivation years, soil nutrients, variation laws of soil nutrients