杉木连栽林地土壤特征和回心土造林更新技术研究

Study on Soil Poperties in Chinese-Fir Repeated plantation and Forestation Regeneration Technique in Bed Soil

杉木连栽与头裁土壤的研究表明，连栽引起土壤物理性状变差，土壤有机质、Ｎ、Ｐ、Ｋ养分含量下降，土壤微生物数量减少，酶活性和呼吸强度下降。经盆栽试验、连栽造林试验表明，不利于杉木连栽生长的限制因子集中在表土层，采用回心土造林技术，杉木生长量和保存率显著提高。

Study on soil properties in Chinese- fir Repeated plantation and in the first cultivation standshowed that cultivation without rotation could cause change of soil Physical properties,decrease of organicmatter N. P. K content in soil, reduction of microbe, decrease of enzyme activity and breathing intensity.Experiment on pot culture and cultivation without rotation demonstrated that limiting factors for growth ofcultivation without rotation were in the pedosphere, therefore, forestion in bed soil could increase evidentlygrowth of Chiners fir.