Understory vegetation management affected greenhouse gas emissions and labile organic carbon pools in an intensively managed Chinese chestnut plantation
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- 作者：Jiaojiao Zhang (1) (2)
Yongfu Li (1) (2)
Scott X. Chang (3)
Peikun Jiang (1) (2)
Guomo Zhou (1) (2)
Juan Liu (1) (2)
Jiasen Wu (1) (2)
Zhenming Shen (4) - 关键词：Castanea mollissima ; Greenhouse gas (GHG) emission ; Labile organic C pools ; Understory management ; Soil nutrient
- 刊名：Plant and Soil
- 出版年：2014
- 出版时间：March 2014
- 年：2014
- 卷：376
- 期：1-2
- 页码：363-375
- 全文大小：482 KB
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Yongfu Li (1) (2)
Scott X. Chang (3)
Peikun Jiang (1) (2)
Guomo Zhou (1) (2)
Juan Liu (1) (2)
Jiasen Wu (1) (2)
Zhenming Shen (4)
1. Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, Zhejiang A & F University, Lin’an, 311300, China
2. The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin’an, 311300, China
3. Department of Renewable Resources, University of Alberta, 442 Earth Sciences Building, Edmonton, AB, T6G 2E3, Canada
4. Forest Technology Service General Station of Lin’an City, Lin’an, 311300, China - ISSN：1573-5036
文摘
Background and aims The impact of understory vegetation control or replacement with selected plant species, which are common forest plantation management practices, on soil C pool and greenhouse gas (GHG, including CO2, CH4 and N2O) emissions are poorly understood. The objective of this paper was to investigate the effects of understory vegetation management on the dynamics of soil GHG emissions and labile C pools in an intensively managed Chinese chestnut (Castanea mollissima Blume) plantation in subtropical China. Methods A 12-month field experiment was conducted to study the dynamics of soil labile C pools and GHG emissions in a Chinese chestnut plantation under four different understory management practices: control (Control), understory removal (UR), replacement of understory vegetation with Medicago sativa L. (MS), and replacement with Lolium perenne L. (LP). Soil GHG emissions were determined using the static chamber/GC technique. Results Understory management did not change the seasonal pattern of soil GHG emissions; however, as compared with the Control, the UR treatment increased soil CO2 and N2O emissions and CH4 uptake, and the MS and LP treatments increased CO2 and N2O emissions and reduced CH4 uptake (P-lt;-.05 for all treatment effects, same below). The total global warming potential (GWP) of GHG emissions in the Control, UR, MS, and LP treatments were 36.56, 39.40, 42.36, and 42.99?Mg CO2 equivalent (CO2-e) ha??year?, respectively, with CO2 emission accounting for more than 95?% of total GWP regardless of the understory management treatment. The MS and LP treatments increased soil organic C (SOC), total N (TN), soil water soluble organic C (WSOC) and microbial biomass C (MBC), while the UR treatment decreased SOC, TN and NO3 ?/sup>-N but had no effect on WSOC and MBC. Soil GHG emissions were correlated with soil temperature and WSOC across the treatments, but had no relationship with soil moisture content and MBC. Conclusions Although replacing competitive understory vegetation with legume or less competitive non-legume species increased soil GHG emissions and total GWP, such treatments also increased soil C and N pools and are therefore beneficial for increasing soil C storage, maintaining soil fertility, and enhancing the productivity of Chinese chestnut plantations.