植物生态学报 ›› 2016, Vol. 40 ›› Issue (5): 458-468.DOI: 10.17521/cjpe.2015.0313

• 研究论文 • 上一篇    下一篇

马尾松人工林伐桩储量与分解特征

汪沁1, 杨万勤1,2,*, 吴福忠1,2, 张健1,2, 谭波1,2, 张玺涛1   

  1. 1四川农业大学生态林业研究所, 长江上游林业生态工程省级重点实验室, 成都 611130
    2长江上游生态安全协同创新中心, 成都 611130
  • 出版日期:2016-05-10 发布日期:2016-05-25
  • 通讯作者: 杨万勤
  • 基金资助:
    国家“十二五”科技支撑计划(2011BAC- 09B05)、国家自然科学基金(31370628)、四川省杰出青年学术与技术带头人培育项目(2012JQ0008)和中国博士后科学基金(2013M540714和2012T50782)。

Characteristics of stump stock and decomposition in Pinus massoniana plantation

Qin WANG1, Wan-Qin YANG1,2,*, Fu-Zhong WU1,2, Jian ZHANG1,2, Bo TAN1,2, Xi-Tao ZHANG1   

  1. 1Sichuan Agricultural University Institute of Forestry & Ecology, Sichuan Provincial Key Laboratory of Forestry Ecological Engineering in the Upper Reaches of Yangtze River, Chengdu 611130, China

    2Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chengdu 611130
  • Online:2016-05-10 Published:2016-05-25
  • Contact: Wan-Qin YANG

摘要:

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≤10 mm; 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。

关键词: 马尾松人工林, 伐桩, 分解序列, 储量, 分解特征

Abstract: <i>Aims</i>

Stump plays crucial roles in maintaining soil fertility, sequestering carbon, nursing biodiversity, and conserving soil and water in plantation ecosystems. However, little is known about the decay of stump and the related roots in Pinus massoniana plantations. This study aims to explore the characteristics of stump stock and decomposition in the P. massoniana plantation.

<i>Methods</i>

Based on log file records of P. massoniana plantation from Laifu Forestry Management Institute in Yibin City of Sichuan Province, we established a chronosequence of decaying P. massoniana stumps from 1999 to 2013. We then investigated the stock and density of stump wood (SW), bark (B), stomp root (SR), and linked roots with different diameters (R1: 0 mm < diameter ≤10 mm; R2: 10 mm < diameter ≤25 mm; R3: 25 mm < diameter ≤100 mm; R4: diameter > 100 mm).

<i>Important findings</i>

In the investigated P. massoniana plantations, the stump stocks ranged from 5 to 58 t·hm-2, stocks in stump wood was the largest, in stump root as the second, and in bark was the smallest, which decreased with the decomposing time. Correspondingly, stump density decreased with decomposing time, while the changes in density varied with stump wood, stump root and roots with different diameters. The decomposition constants of stump wood, bark and stump root were estimated at 0.061, 0.027 and 0.036, respectively. The decomposition constants of roots were estimated to be 0.079 for R1, 0.042 for R2, 0.047 for R3 and 0.119 for R4, respectively. In conclusion, the P. massoniana plantation has a high stock, but decomposes slowly and the decomposition constant varies greatly with stump components in the P. massoniana plantation, which provides certain theoretical basis for the sustainable management of P. massoniana plantation in the region.

Key words: Pinus massoniana plantation, stump, decomposition sequence, stock, decomposition characteristics