论文部分内容阅读
结果表明：杉木连栽引起林地肥力减退，土壤地力衰退程度与前茬林生长周期有关。头茬杉木林周期短（14a）的二耕土上连栽的杉木长势较好，头茬杉木林周期长（24a）的二耕土上连栽的杉木幼树长势极差。林地施肥后并没有促进杉木幼树恢复生长。原因在于杉木幼树根系受到土壤中有毒物质毒害，根系腐烂，不能从土壤中吸收养分。建议采取生物工程措施解决杉木连裁地力减退问题。
The results showed that continuous planting of Chinese fir led to the decline of soil fertility, and the degree of soil fertility decline was related to the growth period of the former continuous forest. Cunninghamia lanceolata growing on two cultivated cotyledons with short period of cedar forest (14a) grew well. The young cedar in continuous cropping on the second cotyledons with the first cedar period (24a) grew very poorly. Fertilization of woodland did not promote the restoration of young Chinese fir seedlings. The reason is that the roots of Chinese fir seedlings are poisoned by toxic substances in the soil and their roots rot and can not absorb nutrients from the soil. Bio-engineering measures are suggested to solve the problem of diminishing the productivity of Cunninghamia lanceolata.