基于GIS和地统计学的低山茶园土壤肥力质量评价

Comprehensive evaluation of fertility quality in hilly tea plantation soils based on GIS and geostatistics

亚热带低山区是我国茶园的主要分布区域,研究其土壤肥力质量状况是茶园精准化和信息化管理的基础。利用地统计学、GIS以及多元统计分析相结合的方法,对蒙顶山茶园土壤肥力质量进行了定量化综合评价研究。结果表明:(1)蒙顶山茶园土壤肥力质量沿海拔高度垂直变化明显,大部分土壤肥力区沿蒙顶山阳坡面水平方向呈带状分布。土壤肥力较高的区域分布在山体的中上部,随着海拔高度的降低土壤肥力质量水平也逐渐降低。(2)蒙顶山茶园土壤肥力质量总体水平不高。区域内土壤各项肥力指标与优良茶园相比还存在差距,同时肥力质量偏低的区域所占面积较大:第四、五两级肥力区所占面积最大,占总面积的42.35%。肥力较低的后5级占总面积的近70%,而肥力最高的3级不到10%。(3)采用该方法进行土壤肥力质量评价能较客观地反映土壤肥力状况,为地统计研究成果实际运用提供了思路。

The subtropical low hill areas have the largest tea fields in China. Research on soil fertility is fundamental for accurate information management of the tea cuhivations. A co ensive evaluation of the soil fertility in Mengding Mountain was carried out with Geostatistics, GIS, and statistics methods. The Mengding Mountain is changing dramatically with the change of altitude. The study shows ： （ 1 ） The soil fertility quality of hill can also be divided into different sections delimited by their fertility level： the richest soils are located in the middle and top section of the hill; the poorest, at the bottom. In other words ： the higher the elevation, the richer the soil ; the lower the elevation the poorer the soil. （2） The overall fertility level in Mengding Mountain is not high. There is a difference between today＇ s Mengding fertility quality situation and the soil quality standards of good tea fields. In fact, most of Mengding Mountain has a low-grade quality soil. Indeed, the fourth and fifth grade soils cover 42.35% of the whole area. In contrast, the highest-grade soil accounts for less than 10%. （3） The application of this comprehensive method provides accurate and objective information on the soil fertility quality. It also gives a new practical approach to Geostatistics.