三倍体毛白杨不同有机残体分解及氮磷释放特征

doi:10.11707/j.1001-7488.20140401

Abstract

Abstract:

In order to understand the decomposition rate and nutrient dynamic of different organic residues of triploid Populus tomentoza, and to find out feasible ways for maintaining and improving long-term soil productivity, litterbag method was used to investigate the decomposition rate and macro nutrients(N, P) release of leaf litter, fine branch litter(Ø≤5 mm), fine root litter(Ø≤2 mm) and bark litter for 357 days. By the end of experiment, decomposition rates of fine root litter, leaf litter, bark litter and fine branch litter were 42.5%, 30.5%, 26.0%, and 20.9%, respectively and were significantly different (P<0.001) among different organic residues. The decomposition process of the 4 residues fitted well to Olson equation, with values of correlation efficient square ranging from 0.96 and 0.98. According to Olson equation, annual decomposition rates of different residues were significantly different, from 42.88% for fine root litter, 31.74% for leaf litter, 26.25% for bark litter, to 20.54% for fine branch litter. Enrichment of N, P in remains was observed in the 4 residues, but the duration and amplitude of enrichment were different for different residues. Enrichment amplitude of N was 11.6%, 127.2%, 122.6%, 126.7% and of P was 105.9%, 172.9%, 123.0%, 163.9%, respectively for fine root litter, leaf litter, bark litter and fine branch litter. The duration of N enrichment was 205d, 239d, 297d, 265d, respectively for fine root litter, leaf litter, bark litter and fine branch litter. The duration of N enrichment for bark litter was the longest. The duration of P enrichment was 205d, 205d, 265d and 239d, respectively for fine root litter, leaf litter, bark litter and fine branch litter. The duration of P enrichment for fine branch litter was the longest. The maximum of N, P release was from fine root litter, secondly from leaf litter, the minimum from bark litter and fine branch litter. These results indicated that different residues had different characters in nutrient release and needed to employ proper measures to promote decomposition and nutrient release, especially for bark litter and fine branch litter due to their lower decomposition rate and longer nutrient enrichment.

Key words: triploid Populus tomentosa, leaf litter, fine root, bark, branch, site productivity

CLC Number:

S718.5

Song Yueqin, Xie Zongqiang, Zhai Mingpu, Jia Liming. Mass Losses and Nitrogen and Phosphorous Dynamics during the Decomposition of Different Organic Residues of Triploid Populus tomentosa[J]. Scientia Silvae Sinicae, 2014, 50(4): 1-7.

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Mass Losses and Nitrogen and Phosphorous Dynamics during the Decomposition of Different Organic Residues of Triploid Populus tomentosa

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