Dynamics on humic acid and fulvic acid in the stump systems with different log years in the Pinus massoniana plantations

doi:10.7523/j.issn.2095-6134.2017.04.015

Abstract

Abstract: The turnover of humic acid (HA) and fulvic acid (FA) during stump humification plays crucial roles in sequestering carbon and maintaining soil fertility in plantation ecosystems, but little related information has been available. A field experiment was conducted in Masson pine (P. massoniana) plantations in Sichuan Basin. The decaying stumps were sampled based on the local log file records from 1999 to 2013, and the stump system was further divided into stump wood (SW), stump root (SR), bark (B), and linked roots (Rn) with different diameters. After 15-year decomposition, HA concentration and HA/FA in the stump system increased significantly, while the stocks of HA and FA and FA concentration in the stump system decreased significantly. The stocks of HA and FA in the stump system ranged from 1 688.35 to 4 434.99 kg·hm^-2 and from 822.86 to 6 159.29 kg·hm^-2, respectively, in the Masson pine plantation. SR had higher HA and FA stocks than SW and B. Moreover, the roots with larger diameter had higher HA and FA stocks than those with smaller diameters. In conclusion the stump system in the Masson pine plantation has high stocks of HA and FA and the humification degree increases in decaying process. The results provide basic information for understanding the processes of coarse wood debris decomposition and carbon sequestration in the plantations.

Key words: Pinus massoniana plantations, stump systems, humic acid, fulvic acid, HA/FA

CLC Number:

ZHOU Jiao, YANG Wanqin, WU Fuzhong, TAN Bo, DUAN Fei, LIU Hui. Dynamics on humic acid and fulvic acid in the stump systems with different log years in the Pinus massoniana plantations[J]. , 2017, 34(4): 521-528.

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