杉木-深山含笑混交林及其纯林乔木层的净生产力研究

Net Productivity of Cunninghamia lanceolata and Michelia maudiae in Mixed and Pure Stand

采用树干解析法与样地调查,2015年对15年生杉木Cunninghamia lanceolata深山含笑Michelia maudiae混交林及其纯林的乔木层净生产力进行研究。结果表明,乔木层生物量深山含笑纯林(43.26 t·hm(-2))>杉木-深山含笑混交林(32.63 t·hm(-2))>杉木纯林(28.75 t·hm(-2)),且混交林单株树干生物量的积累均高于纯林;乔木层净生产力杉木-深山含笑混交林(5.63 t·hm(-2)·a(-1))>深山含笑纯林(4.12 t·hm(-2)·a(-1))>杉木纯林(3.75 t·hm(-2)·a(-1));年凋落物量杉木-深山含笑混交林(3.30 t·hm(-2)·a(-1))>深山含笑纯林(2.94 t·hm(-2)·a(-1)>杉木纯林(2.61 t·hm(-2)·a(-1))。表明杉木-深山含笑混交林比杉木纯林更有利于林分光合产物的积累,增加养分归还量,有利于林分养分循环利用。

Determinations were conducted on biomass,net productivity and litter of14-year Cunninghamia lanceolata and Michelia maudiae in mixed stand and their pure stand in2015by stem analysis and sample plot survey.The results demonstrated that biomass at tree layer of pure M.maudiae stand was higher than that of mixed stand and pure C.lanceolata stand,and single trunk biomass of two species in mixed stand was higher than that in their pure stand.Net productivity at tree layer was ordered by pure M.maudiae stand>mixed stand>pure C.lanceolata stand,and the annual amount of litterfall was mixed stand>M.maudiae stand>pure C.lanceolata stand.It concluded that mixed stand had advantages of more photosynthetic product,better soil nutrient circling.