炼山后杉木幼林地土壤肥力动态研究

本文通过连续四年定位研究,结果表明:炼山后一段时期内（几个月至一年）,林地土壤肥力和土温得到短期提高,但土壤全N和有机质因高温挥发而有所降低;随后因炼山林地裸露,水土流失加剧,土壤肥力各指标呈逐年下降趋势;至第四年又表现出回升趋势。说明炼山一方面加快杉木人工林生态系统的养分循环,另一方面又干扰和破坏生态系统的养分循环的格局。

Studies on the Dynamic of Soil Fertility in Young Chinese Fir plantation after Controlled Burning

In this paper, it is reported that the fixed position observation for four years in succession after controlled burning showed that the soil fertility and soil temperature were improved in short period(several months to one year), but the organic material and the overall nitrogen of soil were a bit declined because of volatilization caused by high temperature, then the fertility was yearly declined with the increase in the amount of water, soil and nutrient lost; and that in the fourth year, soil fertility of forest land had a resum-ing tendency again, indicating that controlled burning could, on one hand, speed up nutrient circulations of Chinese fir plantation ecosystem, but would, on the other, interfere with and destroy nutrient circulations' pattern of ecosyst-em.