Comparison of litterfall and nutrients return properties of primary and secon-dary forest ecosystems, the karst region of Northwest Guangxi
Litterfall was the important component of forest ecosystems, and the availability of soil nutrients depends on how much the litterfall nutrients return. The research of litterfall biomass and nutrients return rate was most valuable for us to realize the nutri-ents cycle in the discontinuous soil layer region, karst area of China. This paper investigated the yearly total litterfall biomass, litter-fall composition and monthly dynamic, nutrients return rates and dynamics of 3 primary forests comparing to 3 secondary forests. Results find that, leaf litter composes about 80% of the total litteffall biomass in both primary and secondary forests, and even more. Total yearly litteffail of Round-fruited Dye-tree, Large-leaved Distylium and Wing-hackberry primary forests was 2 342.16, 4 057.99 and 1 834.36 kg·hm~(-2), respectively, and was 3 192.82, 3 284.26, 2469.90 kg·hm~(-2), respectively in three secondary forests of Round-leaved Tallow-tree, Chinese Alangium and Negundo Chaste-tree. Total litterfall mass of secondary forests was larger than those of the primary forests except for Large-leaved Distylium. The nutrients return monthly dynamic fits the litterfall dynamic well, the primary forests was "U" shape from Nov. 2007 to Nov. 2008, while the secondary forest was "W" pattern. Nutrients return rates and quantity of C, N, K, P showed the order of C>N>K>P both in three primary and three secondary forests, and the nutrients return rate and quantity of C, N, P in secondary forests were faster and larger than those of primary forests.
国家科技期刊平台
NSTL
万方数据
维普
