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伐桩在人工林生态系统地力维持、碳吸存、生物多样性保育、水土保持等方面具有十分重要的意义,但对其储量及其分解特征的研究并不多见。因此,该文作者基于马尾松(Pinus massoniana)人工林采伐档案,2013年7月以1999–2013年间采伐残留的伐桩为研究对象,调查了1–15年伐桩系统的木桩(SW)、树皮(B)、根桩(SR),以及不同径级根系(R1:0 mm<径级≤10mm;R2:10 mm<径级≤25 mm;R3:25 mm<径级≤100 mm;R4:径级>100 mm)的储量与分解特征。研究结果表明:马尾松人工林整个伐桩系统储量介于5–58 t·hm–2之间,根桩储量最大,木桩储量次之,树皮储量最小,根桩、木桩和树皮的储量均随着分解时间而降低。伐桩密度随分解时间而降低,但木桩、根桩和粗根径级均显著影响密度的变化。木桩、树皮和根桩的分解常数分别为0.061、0.027、0.036,R1、R2、R3、R4根系的分解常数分别为0.079、0.042、0.047、0.119。由此可见,马尾松人工林伐桩系统具有较高的储量,但分解较慢,且不同组分的降解速率具有显著差异。
Stump removal is of great importance in the conservation of plantation ecosystem, carbon sequestration, conservation of biodiversity, soil and water conservation, etc. However, researches on its reserves and its decomposition characteristics are rare. Therefore, based on the logging files of the Pinus massoniana plantations, the author studied the residual felling of stumps from 1999 to 2013 in July 2013, , Bark (B), root piles (SR) and root systems with different diameters (R1: 0 mm 100 mm) reserves and decomposition characteristics. The results showed that the storage capacity of Pinus massoniana plantation was between 5-58 t · hm-2, the storage of root pile was the largest, the storage of stump was the second, the storage of bark was the smallest, the root pile, stump and bark The reserves are reduced with the decomposition time. The pile densities decreased with the decomposition time, but the stakes, root piles and root diameter significantly affected the density change. The decomposition constants of wood pile, bark and root pile were 0.061, 0.027, 0.036, respectively. The decomposition constants of R1, R2, R3 and R4 roots were 0.079, 0.042, 0.047 and 0.119, respectively. Thus, the Pinus massoniana plantation logging system has a higher reserves, but the decomposition is slow, and the degradation rate of different components have significant differences.