Soil moisture as a predictor of methane uptake by temperate forest soils
Soil moisture as a predictor of methane uptake by temperate forest soils
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DOI：
10.1139/x94-233
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发表时间：
1994-09
影响因子：
2.2
通讯作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
中科院分区：
文献类型：
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作者：
M. Castro;J. Melillo;P. Steudler;Jon W. Chapman
我们进行了土壤水分调控实验，在红松（Pinusresinosa Ait.）种植园在哈佛森林（彼得舍姆，马萨诸塞州）1992年8月和1993年5月。为了控制土壤水分，我们在1平方米的地块中添加了10厘米的地下水，并允许土壤干燥至其预处理含水量。我们测量了甲烷（CH 4）通量，土壤水分和温度之前和之后的水添加。土壤中的控制和浇水地块通常汇大气CH 4。对照土壤的平均消耗率为0.12至0.17 mg CH 4-C·m−2·h−1。浇水土壤的甲烷消耗率范围为0至0.12 mg CH 4-C·m−2·h−1，与矿物土壤上部10 cm的含水量呈负相关。土壤含水量和CH 4消耗量之间的线性回归解释了78%的变异性（CH 4消耗量= 0.00175（孔隙水填充百分比）-0.1957）。使用这种经验关系，我们预测了CH 4消耗的土壤在其他三个位置，即…
We conducted soil moisture manipulation experiments in a red pine (Pinusresinosa Ait.) plantation at the Harvard Forest (Petersham, Mass.) in August 1992 and May 1993. To manipulate soil moisture, we added 10 cm of groundwater to 1-m2 plots and allowed the soils to dry down to their pretreatment moisture contents. We measured methane (CH4) flux, soil moisture, and temperature prior to and after the water addition. Soils in both the control and watered plots were usually sinks for atmospheric CH4. Average consumption rates by control soils ranged from 0.12 to 0.17 mg CH4-C•m−2•h−1. Methane consumption rates by watered soils ranged from 0 to 0.12 mg CH4-C•m−2•h−1 and were inversely related to the moisture content of the upper 10 cm of mineral soil. Linear regression between soil moisture and CH4 consumption explained 78% of the variability (CH4 consumption = 0.001 75 (percent water filled pore space)–0.1957). Using this empirical relationship, we predicted CH4 consumption by soils at three other locations i...