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Integrated diurnal soil respiration model during growing season of a typical temperate steppe: Effects of temperature, soil water content and biomass production？

作　　者：Jia BR, Zhou GS
影响因子：2.580？
刊物名称：Soil Biology & Biochemistry？
出版年份：
卷：41  期：4  页码：681-686？

论文摘要：

Soil respiration was measured with the enclosed chamber method in an ungrazed Leymus chinensis steppe during the growing seasons of 2001 and 2002. Soil respiration rate (R-s) was significantly influenced by air temperature (T) at the diurnal scale, and could be described by Van't Hoff's equation (R-s = R-10 exp(beta(T - 10))). At the seasonal scale, the normalized soil respiration rate at 10 degrees C (R-10) was mainly controlled by soil water content (R-2 = 0.717, P < 0.001), while the sensitivity of soil respiration to temperature (Q(10)) was partially affected by absolute growth rate (R-2 = 0.482. P = 0.004). Thus, soil respiration could be described as R-S = (20.015W - 84.085) (0.103AGR + 1.786)((T-10)/10) during the growing seasons, integrating soil water content (W) and absolute growth rate (AGR) into the temperature-dependent soil respiration equation. It was validated by the observed soil respiration rates in this study (R-2 = 0.890, P < 0.001) and observations from near-field experiment (R-2 = 0.687, P = 0.011). It implied that accurately evaluating annual soil respiration should include the effects of plant biomass production and other abiotic factors besides air temperature. (C) 2009 Elsevier Ltd. All rights reserved.
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