内蒙古典型草原植物功能型对土壤甲烷吸收的影响
收稿日期: 2010-05-31
录用日期: 2010-11-12
网络出版日期: 2011-03-02
Plant functional type effects on methane uptake by soils in typical grasslands of Inner Mongolia
Received date: 2010-05-31
Accepted date: 2010-11-12
Online published: 2011-03-02
甲烷(CH4)是仅次于CO2的重要温室气体。内蒙古草原是欧亚温带草原的重要类型, 具有典型的生态地域代表性。该文以内蒙古温带典型草原为研究对象, 通过人工剔除植物种的方法来确定群落中的植物功能型, 并应用静态箱技术, 观测土壤CH4的吸收, 以理解植物功能型对土壤CH4吸收的影响。结果表明: 1)土壤CH4的吸收受温度和水分变化的影响, 具有明显的季节差异, 且与温度显著相关。2)在2008年和2009年所测的大部分月份中, 植物功能型的土壤CH4吸收量之间没有显著差异; 然而在植物生长旺季(8月), 不同植物功能型的土壤CH4吸收量之间存在显著差异, 多年生丛生禾草的土壤CH4吸收量最小。3)处理中一、二年生植物、多年生杂类草的存在能够增加土壤CH4的吸收量, 而处理中多年生根茎类禾草、多年生丛生禾草的存在对土壤CH4吸收的影响不大。这可能是因为, 植物功能型影响土壤的微生物代谢和环境因子, 进而影响土壤CH4吸收量。该试验说明, 在痕量气体层面上, 植物功能型组成在生态系统功能中具有重要作用, 特别是群落中的亚优势种和伴生种(一、二年生植物、多年生杂类草), 通过调控土壤微生物和环境因子, 对地-气的CH4交换产生重要影响。
刘伟, 王继明, 王智平 . 内蒙古典型草原植物功能型对土壤甲烷吸收的影响[J]. 植物生态学报, 2011 , 35(3) : 275 -283 . DOI: 10.3724/SP.J.1258.2011.00275
Aims Methane (CH4) is an important atmospheric trace gas contributing to global warming and atmospheric chemistry. Aerated soils are a biological sink for atmospheric CH4. Our objectives were to quantify CH4 uptake by soils in typical grasslands of Inner Mongolia and examine the effects of plant functional type on the uptake.
Methods We used static chamber sampling and gas chromatography measurement to examine the effects of four plant functional types (PFTs) ― perennial rhizome forbs (PR), perennial bunchgrass (PB), perennial forb (PF) and annuals and biennials (AB) ― on CH4 uptake by aerated soils.
Important findings CH4 uptake by soils showed seasonal change related to soil water content and temperature. Over most of observed periods in 2008 and 2009, there were no significant differences in soil CH4 uptake rates among the various PFTs. During rapid plant growth in August, however, there were significant differences in the soil CH4 uptake rates. The soil CH4 uptake rates were lower with PBs. AB and PF increased the uptake of CH4 by soils, while PR and PB had little influence. Soil physico-chemical factors such as temperature, water content and gas diffusion affect CH4 uptake. Differences in CH4 uptake rates by soils may be explained using these environmental factors affected by PFTs. With regard to trace gas, PFT has prominent effects on this ecosystem. Sub-dominant species and companion species (AB and PF), by regulating soil microbe and environmental factors, have important and irreplaceable roles on the uptake of CH4 by soils.
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