杉木连栽对土壤物理性质的影响

在福建省南平市花岗岩母 林地上，应用生态系列法对不同栽植代数、不同立地待人接物不同林分年龄的系列杉林样地土壤的物理性质进行了研究。结果表明，杉木连栽对土壤容重和孔隙状况的影响主要在林分的中龄林时期。随着载植代数的增加，土壤容重趋于增加；对于幼林和成林，由于受整地、抚育和林下植被的恢复及枯枝落叶的分解，不同栽植代数对土壤孔隙状况的影响不甚明显；不同载植代数对土壤水分性能的影响主 表现在中龄林和成熟林时期。表层土壤的持水能力一般随栽植代数增加而下降，土壤的渗透性能超于降低，地位指数愈高，这种下降趋势愈明显。

Effects of Continuous Plantation of Chinese fir on Soil Physical Properties

The effects of different types of Chinese fir stand, including those with different rounds of continuous cropping, different ages and different site indexes in northern Fujian province were studied by means of ecological sequential comparison . The results revealed that physical properties of soil were greatly influenced by the continuous cropping of Chinese fir. Especially in the mid age stands, the soil volume weight increased, capillary, non capillary and total porosity of soil under the second and the third plantings decreased, compared with the first one. Soil permeability also became worse. For the young plantation, due to the influences of site preparation and tending, the effects of continuous cropping on soil physical properties were not as clear as those in the mid age stands.