Soil surface CO2 flux in a Minnesota peatland
Soil surface CO2 flux in a Minnesota peatland
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明尼苏达泥炭地土壤表面二氧化碳通量
DOI：
10.1007/bf00000425
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
S. Verma
中科院分区：
文献类型：
--
作者：
Joon Kim;S. Verma
1991年6~10月，对明尼苏达州中北部泥炭地中凹陷和丘陵微生境的土壤表面CO2通量进行了测定。采用封闭式红外气体交换系统测量土壤CO2通量。丘陵的CO2释放速率(9.8±3.5g m−2d−1，[Mean±SE])始终高于丘陵(5.4±2.9g m−2d−1)(包括苔藓暗呼吸的贡献，可能占总测量通量的10-20%)。土壤CO2通量强烈依赖于温度(Q10≈3.7.7)，并与地下水位深度的变化呈线性关系。以泥炭温度和地下水位为自变量的经验乘法模型解释了CO2通量数据中约81%的方差。利用测量泥炭温度和估计凹陷/丘陵微地形分布(相对于地下水位高度)的经验模型，计算了“站点平均”CO2的日释放速率。在这6个月期间(5-10月)，该生态系统释放的土壤CO2总量约为1340g CO2m−2。
Soil surface CO2flux was measured in hollow and hummock microhabitats in a peatland in north central Minnesota from June to October in 1991. We used a closed infrared gas exchange system to measure soil CO2flux. The rates of CO2evolution from hummocks (9.8 ± 3.5 g m−2d−1, [mean ± SE]) were consistently higher than those from hollows (5.4 ± 2.9 g m−2d−1) (the hummock values included the contribution of moss dark respiration, which may account for 10–20% of the total measured flux). The soil CO2flux was strongly temperature-dependent (Q10≈ 3.7) and appeared to be linearly related to changes in water table depth. An empirical multiplicative model, using peat temperature and water table depth as independent variables, explained about 81% of the variance in the CO2flux data. Using the empirical model with measurements of peat temperature and estimates of hollow/hummock microtopographic distribution (relative to water table elevation), daily rates of “site-averaged” CO2evolution were calculated. For the six-month period (May–October), the total soil CO2released from this ecosystem was estimated to be about 1340 g CO2m−2.