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[1]陈瑶,王法明,莫其锋,等.氮磷添加对华南热带森林尾叶桉木质残体分解和养分动态的影响[J].应用与环境生物学报,2015,21(04):743-753.[doi:10.3724/SP.J.1145.2015.01056]
 CHEN Yao,WANG Faming,MO Qifeng,et al.Effects of nitrogen and phosphorus additions on woody debris decomposition in a secondary tropical forest of South China[J].Chinese Journal of Applied & Environmental Biology,2015,21(04):743-753.[doi:10.3724/SP.J.1145.2015.01056]
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氮磷添加对华南热带森林尾叶桉木质残体分解和养分动态的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
21卷
期数:
2015年04期
页码:
743-753
栏目:
研究论文
出版日期:
2015-08-25

文章信息/Info

Title:
Effects of nitrogen and phosphorus additions on woody debris decomposition in a secondary tropical forest of South China
作者:
陈瑶 王法明 莫其锋 李钦禄 邹碧 李应文 李晓波 吴靖滔 李志安
1中国科学院华南植物园,退化生态系统植被恢复与管理重点实验室 广州 510650 2中国科学院大学 北京 100049 3广东茂名市小良水土保持试验推广站 茂名 525029
Author(s):
CHEN Yao WANG Faming MO Qifeng LI Qinlu ZOU Bi LI YingwenLI Xiaobo WU Jingtao LI Zhi’an
1Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China 2University of Chinese Academy of Sciences, Beijing 100049, China 3Xiaoliang Research Station for Water and Soil Conservation, Maoming 525029, China
关键词:
尾叶桉氮沉降磷限制木质残体分解速率有机碳
Keywords:
Eucalyptus urophylla nitrogen deposition phosphorus limitation woody debris decomposition rate organic carbon
分类号:
S718.554.2
DOI:
10.3724/SP.J.1145.2015.01056
文献标志码:
A
摘要:
木质残体(Woody debris,WD)是森林生态系统中一个重要的碳库和营养源,在全球变暖、氮(N)沉降日益严重的今天,研究N、磷(P)沉降影响WD分解的反应机制对于应对环境变化具有重要意义. 以小良热带阔叶林尾叶桉(Eucalyptus urophylla)WD为研究对象,人工模拟N和P添加对尾叶桉WD分解速率及养分释放的影响. 结果表明:与对照相比,N添加使WD分解速率常数k降低了11%,而P添加显著提高分解速率常数k(P = 0.027),上升幅度为6%. 这表明,富N缺P的热带森林,P的可利用性限制了WD分解速率,P限制有利于WD中碳的固存. N添加、P添加改变了尾叶桉WD分解过程中N元素的迁移模式,与对照相比,两种处理均使N元素迁移方式由直接释放改变为淋溶—富集—释放,而对分解过程中P元素的迁移模式有不同影响,N添加使P元素的迁移方式由直接释放改变为淋溶—富集—释放,P添加使P元素的迁移方式改变为富集—释放. 分解过程中质量残留率与分解过程中C/N比、C/P比呈显著负相关(P < 0.01). 可见,N、P沉降的增加对WD分解速率和养分释放模式有不同的效应.
Abstract:
Woody debris (WD) is an important structural component of many forest ecosystems and plays a key role in carbon sequestration. Despite the large amounts of carbon stored in WD, little attention is paid to its decomposition, which is critical to mitigating climate change, including the chronically elevated atmospheric nitrogen and phosphorus deposition. This study aimed to understand the factors controlling organic matter decomposition in tropical forests. We conducted a factorial fertilization experiment in a tropical forest in South China to investigate the influence of nitrogen (N) and phosphorus (P) availability on WD decomposition using branch segments (5 cm in diameter) of Eucalyptus urophylla in plots fertilized with +N, +P, +NP, and controls. The results showed that nitrogen addition had negative (-11%) effect on E. urophylla WD decomposition, whereas phosphorus addition had positive (+6%) effect. Two-way ANOVA showed that P addition statistically increased WD decomposition rate constants (P = 0.027), indicating that P inputs stimulate WD decomposition and enhance C release. Compared to the control, in the early period of decomposition, N addition promoted N and P release by leaching, while at the middle of decomposition, N addition significantly increased the N and P content remainings (> 100%) but decreased them (< 100%) at the end of decomposition. We observed significant accumulation of P in P addition plots in the early period of decomposition, while at the end of decomposition, all treatments had the similar P content remaining (< 100% for all). Moreover, through the decomposition, WD mass remaining had a significantly negative relationship with both C:N ratio and C:P ratio. Our results indicated that decomposition of WD is primarily constrained by P availability in the tropical forest.

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备注/Memo

备注/Memo:
广东省林业科技创新专项基金项目(2012KJCX013-02,2014KJCX021-03)、国家自然科学基金项目(31300419)和国家重点基础研究发展计划项目(2011CB403204)资助 Supported by the Forestry Sci-tech Innovation Foundation of Guangdong Province (2012KJCX013-02, 2014KJCX021-03), the National Natural Science Foundation of China (31300419) and the State Key Basic R & D Program of China (2011CB403204)
更新日期/Last Update: 2015-08-25