中国南方珠江三角洲地区沿城乡梯度的森林土壤中甲烷吸收情况
Methane uptake in forest soils along an urban-to-rural gradient in Pearl River Delta, South China.
作者信息
Zhang Wei, Wang Keya, Luo Yiqi, Fang Yunting, Yan Junhua, Zhang Tao, Zhu Xiaomin, Chen Hao, Wang Wantong, Mo Jiangming
机构信息
1] Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China [2] Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA.
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.
出版信息
Sci Rep. 2014 May 30;4:5120. doi: 10.1038/srep05120.
We investigated soil CH4 fluxes from six forests along an urban-to-rural gradient in Guangzhou City metropolitan area, South China. The most significant CH4 consumption was found in the rural site, followed by suburban, and then urban forest sites. The rates of CH4 uptake were significantly higher (by 38% and 44%, respectively for mixed forest and broadleaf forest) in the rural than in the urban forest site. The results indicate that soil water filled pore space (WFPS) is the primary factor for controlling CH4 consumption in subtropical forests. The reductions of soil CH4 uptake in urban forests were also influenced by the higher rates of atmospheric nitrogen (N) deposition and increases in soil nitrate (NO3(-)) and aluminum (Al(3+)) contents as a result of urbanization. Results from this work suggest that environmental changes associated with urbanization could decrease soil CH4 consumption in subtropical forests and potentially contribute to increase of atmospheric CH4 concentration.
我们对中国南方广州市大都市区沿城市到农村梯度的六个森林的土壤甲烷通量进行了调查。在农村地区发现了最显著的甲烷消耗，其次是郊区，然后是城市森林地区。农村地区的甲烷吸收速率显著高于城市森林地区（混交林和阔叶林分别高出38%和44%）。结果表明，土壤水分填充孔隙空间（WFPS）是控制亚热带森林甲烷消耗的主要因素。城市化导致的大气氮（N）沉降速率升高以及土壤硝酸盐（NO3(-)）和铝（Al(3+)）含量增加，也影响了城市森林土壤甲烷吸收的减少。这项工作的结果表明，与城市化相关的环境变化可能会降低亚热带森林土壤的甲烷消耗，并可能导致大气甲烷浓度升高。
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