Site specific and regional estimates of methane uptake by tropical rainforest soils in north eastern Australia
Site specific and regional estimates of methane uptake by tropical rainforest soils in north eastern Australia
复制标题
澳大利亚东北部热带雨林土壤甲烷吸收的具体地点和区域估计
DOI：
10.1007/s11104-008-9545-0
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发表时间：
2008
期刊：
影响因子：
4.9
通讯作者：
K. Butterbach‐Bahl
中科院分区：
文献类型：
--
作者：
R. Kiese;S. Wochele;K. Butterbach‐Bahl
采用实验室、野外和模拟模型相结合的方法研究了澳大利亚昆士兰州东北部雨林土壤的甲烷通量。在有氧实验室培养中，土壤表层0.1 m处的CH 4吸收量（-2.5至-7.3 μg CH 4 kg-1 SDW day-1）比厌氧条件下的CH 4产生量高出约一个数量级。最高的CH 4吸收，以及潜在的CH 4生产被发现在最上层的富C土壤层。从三个对比雨林网站的详细测量确定的土壤作为大气CH 4汇的功能。在一个低地雨林站点连续15个月的测量表明，CH 4吸收的季节性主要是由土壤水分的变化，而不是温度的变化。最大的CH 4吸收量（109 μg CH 4 m−2 h−1）出现在旱季条件下，而在雨季，CH 4吸收量大幅下降，接近于零。基于我们的实验室实验和已发表的文献，我们开发了一个半经验的CH 4模块的地球化学模型ForestDNDCtropica。在几个地点的测试表明，我们的建模方法的鲁棒性与平均模拟值的观测值的12%以内。为了估计区域CH 4吸收雨林土壤在该地区的“湿热带”，昆士兰州，澳大利亚，我们联系CH 4吸收和生产算法的区域GIS数据库。我们估计，昆士兰州东北部的低地和山地雨林土壤是CH 4的净汇，1996年7月至1997年6月期间的平均吸收速率为-2.89 kg CH 4 ha-1年-1。
Methane flux from rainforest soils in northeast Queensland, Australia, was investigated using a combination of laboratory, field and simulation modelling. In aerobic laboratory incubations, CH4 uptake in the top 0.1 m of the soil (−2.5 to −7.3 μg CH4 kg−1 SDW day−1) is approximately one order of magnitude higher than CH4 production under anaerobic conditions. The highest CH4 uptake, as well as potential CH4 production is found in the uppermost C rich soil layers. Detailed measurements from three contrasting rainforest sites identified the soils to be functioning as sinks for atmospheric CH4. Fifteen months continuous measurement at one of the lowland rainforest sites showed that the seasonality of CH4 uptake was mainly driven by changes in soil moisture rather than by temperature changes. Maximum CH4 uptake (109 μg CH4 m−2 h−1) was observed during dry season conditions, whereas during the wet season, CH4 uptake decreased significantly to near zero. Based on our laboratory experiments and on published literature we developed a semi-empirical CH4 module for the biogeochemical model ForestDNDCtropica. Tests at several sites showed the robustness of our modelling approach with mean simulated values within 12% of observed values. To estimate regional CH4 uptake by rainforest soils in the region of the ‘Wet Tropics’, Queensland, Australia, we linked CH4 uptake and production algorithms to a regional GIS database. We estimated that the lowland and montane rainforest soils in northeast Queensland, Australia, were a net sink for CH4 with a mean uptake rate of −2.89 kg CH4 ha−1 year−1 during July 1996 to June 1997 period.
影响因子：
5
作者：
Liu, Chunyan;Holst, Jirko;Zheng, Xunhua
通讯作者：
Zheng, Xunhua