文峪河上游河岸林凋落物及其分解过程研究

通过凋落物定点收集调查和分解袋定点埋置实验,对文峪河上游山地溪流河岸带寒温性针阔叶混交林的年凋落量动态和凋落叶在不同环境中的分解进程进行了周年研究.结果表明,研究地区山地溪流河岸林在河岸带和溪流中的年凋落量分别为3.46和4.09 t·hm-2·a-1；河岸带和溪流凋落物中阔叶凋落量占优势,分别占40.55％和40.1...

Forest Litter and Its Decomposing Processes in Riparian Forests of the Upstream of Wenyu River

By onsite forest litter survey and buried decomposition bags, investigation and study were conducted on the seasonal litter amount dynamics and decomposing processes of forest litter in different environments in cold temperate mixed forests of riparian zones upstream Wenyu River in motane area. The annual litter production of motane riparian forests to the riparian zone and the river were 3.46 and 4.09 t·hm^-2·a^-1 respectively. Of the litter in both environments, the litter from broadleaves was dominant, accounting for 40.55% and 40.19% respectively, while the leaves from conifer and broadleaves accounted for 62.00% and 59.64% of total litter respectively and the branches and leaves accounted for 81.09% and 77.92% respectively. In the composition of litter, the highest litter amount was from broad leaves, then from needle leaves, branches, miscellany, flowers and fruits, barks and herbs subsequently. The annual litter dynamic curves of both environments had two peaks, with the highest amounts occurred from mid-September to mid-October, accounting for 73.46% and 76.92% of annual litter amounts respectively, and from April to June, accounting for 23.3% and 30.3% of annual amounts respectively. In the study area, the decomposition rate of leaf litter in waterbody was lower than those in subtropical forests, but higher than that in many temperate forests. The decomposition rate of leaf litter in waterbody, which was 0.712 9 with a half life of 0.97a, was faster than that in humus layer under riparian forests. Under riparian forests where are close to river banks, the decomposition rates on sun slopes were faster than that on shade slopes, while the decomposition rate and a half life were 0.531 9 and 1.30a for sun slopes and 0.433 7 and 1.60a for shade ones. At where far to river banks, the decomposition rates on sun slopes were slower than that on shade slopes, while the decomposition rate and a half life were 0.604 2 and 1.15a for shade slopes and 0.440 1 and 1.58a for sun ones.