江西井冈蜜柚种植区果园土壤肥力现状及区域分布特征.

This study aims to explore the current situation of the regional distribution and fertility of soil in Jinggang pomelo planting area in Jiangxi Province. The topsoil（0~20 cm），subtopsoil（20~40 cm）and subsoil（40~60 cm）were collected from 110 main orchards of Jinggang pomelo in Jiangxi Province. The study carried out a systematic analysis of 12 soil fertility indexes including soil pH，organic matter and nutrient content using the ArcGIS technology，correlation analysis，and principal component analysis. The results showed that pH and contents of organic matter，alkali hydrolyzed nitrogen，available phosphorus，available potassium，available zinc，and exchangeable magnesium in the topsoil of the orchard were 4.00~7.38，7.85~32.71 g·kg-1 ，45.50~318.50 mg·kg-1 ，1.99~146.11 mg·kg-1 ，26.96~306.08mg·kg-1 ，0.36~16.47 mg·kg-1 ，and 15.00~219.63 mg·kg-1 ，respectively. The contents of available copper and exchangeable calcium were lower than 7.91 mg·kg-1 and 658.88 mg·kg-1 ，respectively. Soil fertility index decreased with the increase in soil depth. Overall，the pH of topsoil was higher in the middle of the planting area and lower around，while the content of available phosphorus showed an opposite trend. The content of organic matter of topsoil in the planting area was higher in the west and lower in the east，and the content of trace elements was less in the south than that in the north. Correlation analysis showed that there was a significantly positive correlation between topsoil pH and exchangeable magnesium content，and a significantly positive correlation between exchangeable magnesium content and exchangeable calcium，available zinc，total phosphorus，and available potassium. Principal component analysis showed that the contents of soil exchangeable calcium，exchangeable magnesium，alkali hydrolyzed nitrogen，and available zinc were the dominant factors influencing soil fertility variation in the planting area. The fertility and regional distribution of orchard soil in Jinggang pomelo planting area in Jiangxi Province were quite different. Improving the acid soil，supplementing medium trace elements are conducive to upgrading soil fertility. [ABSTRACT FROM AUTHOR]