The nonwood forest industry plays an important role in local economic development and ecological environmental protection. In order to realize scientific planting of nonwood forest, N, P and K in soil at nonwood forest planting area at Maiji District of Tianshui were quantitatively analyzed and predicted, based on the surveyed data, zoning map, distribution map of nonwood forest, by diversity analysis, 3S technology and spatial interpolation methods. The results showed that N, P, K contents had more differences in soil of apple, grape, pepper, cherry, pear, peach, apricot, hawthorn, walnut, and persimmon planting areas, and their proportion was imbalance. N and P in soil had very weak spatial correlation, so the external factors had less effect. K in soil had a strong spatial correlation, so the external factors had more effect, so the external factors had more effects and main relation factor was high K content in ash. N, P and K fertilizers application had no uniform reference standards and had a large randomness.%经济林产业对于地方经济的发展和生态环境的保护具有重要作用.为了实现经济林木的科学种植,选择对经济林木种植影响较大的土壤中的N、P、K因子与区划图(即经济林分布图),结合少量的地面调查数据,借助于变异分析、3S技术和空间插值方法,对甘肃省天水市麦积区经济林种植区土壤中的N、P、K含量进行了定量分析和预测研究.结果表明:苹果、葡萄、花椒、樱桃、梨、桃、杏、山楂、核桃、柿子等不同种植区土壤中N、P、K的差异比较大,且其比例严重失调；土壤中N、P的空间相关性很弱,说明受外界因素的影响比较小;土壤中的K具有很强的空间相关性,说明受外界因素的影响比较大,这主要与草木灰中含钾量较高有关；麦积区经济林种植过程中N、P、K的施用还没有可以参照的统一的地方标准,随机性很大.
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