杉木檫树混交林根系生理的初步研究

Physiological characteristics of Cunninghamia lanceolata and Sassafras tsumu roots in mixed forests and pure forests

采用蒽酮比色法、Warburg呼吸计法分别研究了杉木、檫树及其混交林吸收根的可溶性糖含量和呼吸速率 ;用愈创木酚法及双缩脲法测定了根系过氧化物酶活性、根系浸出液中蛋白质含量和电导率。结果表明 :①杉檫混交林根系的过氧化物酶活性都比对应的纯林小 ;②纯林杉木根系的浸出液电导率和浸出液蛋白质含量比混交林根系大 ,而檫树根系与杉木根系的结果相反 ;③混交林杉木根系的可溶性糖含量和呼吸速率则要明显大于纯林杉木 ,而混交林檫树根系的可溶性糖含量则要小于纯林 ,纯林檫树与混交林檫树根系的呼吸速率变化不大。表 1图 4参

The respiratory rate was determined by using Warburg’ respiratory instrument,and the soluble sugar,protein,conductivity rate and peroxidase activity were determined by using the usual chemical analysis methods.The results were as follows:①The peroxidase activities of roots in the mixed Cunninghamia lanceolata and Sassafras tsumu forest were lower than those in corresponding pure forest.②The protein contents and conductivity rate of the roots of Cunninghamia lanceolata in pure forest were higher than those in mixed forest,while those of the roots of Sassafras tsumu were contrary.③The soluble sugar content and respiratory rate of the roots in  Cunninghamia lanceolata mixed forest were much higher than those in pure forest,but the soluble sugar content of the roots of Sassafras tsumu in mixed forest was lower than that in pure forest.The difference of respiratory rate between Sassafras tsumu in pure forest and that in mixed forest was slight.