杉木连栽障碍的原因及其对策

综述了杉木连栽障碍的主要原因：一方面是由于连栽引起了杉木林地生态环境恶化，如炼山和全垦使得养分和水土流失，土壤物理和化学性质发生改变；另一方面是由于微生物区系的变化及土壤酶活性的改变使得次生代谢物质如酚类大量积累，使杉木产生自毒现象．针对这些原因，提出了相应的解决方法

Problem of Chinese Fir Continuous Planting: Its Causes and Solutions

S This paper synthetically analyzed the causes of the continuous planting problem of Cunninghamia lanceolata . The following two causes might be the most important ones.One was the ecosystem problem of the man made Chinese fir forest,i.e.,nutrient loss and soil erosion caused by control burning and thorough plowing,and the changes of the physical and chemical properties of soil,etc.The other was the changes of soil microorganisms,the decrease of enzyme activities,and the accumulation of the secondary metabolites,such as phenols,causing autotoxity.To resolve the problem,some solutions were also suggested in the paper.