木荷林凋落物的归还动态及分解特性

通过对杭州常绿阔叶林中凋落物的定位观测研究表明,该系统中年均凋落物量为5.85t/hm2,其中以叶最多,占总量的79.5%,枝果较少,分别占7.1%和13.4%。归还动态呈双峰型,即4月和9月为2次高峰。凋落物的半分解时间为1.59a,分解动态呈指数衰减规律。凋落物的年养分归还量达223.69kg/hm2。木荷林中凋落物的现存量为7.47t/hm2。平均分解率为45.18%。林分中凋落物量还处于增长阶段。

Dynamics and Decomposition Characteristics of Litter of Evergreen Broad-Leaved Forest with Schimza Superba

Through the long-term plot study on the litter and its decomposition in the evergreen broad-leaved forest in Hangzhou for more than two years, it was resulted that the annual litter production was 5.85 t/hm~2, most of which was the fallen leave (79.5 percent) and the withered branches and fruits were far less (7.1 and 13.4 percent respectively). The dynamics of the fallen litter was shown as a curve of two-peak pattern which appeared in April and September each year. The half-life of the litter was 1.59 a. The decay rate of the litter attenuated as an exponential function. The annual amount of the nutrient returned to the ground through the litter was as large 223.69 kg/hm~2. The total current amount of the litter on the ground was 7.47 t/hm~2 .The decay rate in the first half of a year was 45.18%. The stand remained in the stage of litter increasing with time.