1989年开始,迁西县林业局从燕山地区片麻岩土壤母质层风化层较厚的现实出发,在全县研究并推广了山地栗园炮震扩穴技术。调查结果表明,采用此项技术,可使栗园活土层增加0.9米,促进土壤风化进程,有利养分的分解;可提高山地栗园土壤含水量5.6%,一般每炮穴较震前多蓄水1.48吨,降低土壤侵蚀量107%;增加了树体根系活动范 Starting from 1989, Qianxi County Forestry Bureau proceeded from the fact that the thickening layer of the soil parent material of gneiss in Yanshan area was thick. The survey results show that using this technology can increase the soil layer in the chestnut garden by 0.9 m, promote the weathering process of soil and promote the decomposition of nutrients; improve the water chestnut soil moisture content of 5.6%; generally, 1.48 tons of water, reducing the amount of soil erosion 107%; increased tree roots activity range