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Comparing soil CO_2 emission in pine plantation and oak shrub: dynamics and correlations

机译：比较松树人工林和橡树灌木中土壤CO_2的排放：动力学和相关性

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摘要

The magnitude of soil CO_2 emission varying significantly among different vegetation types for plants could alter the microclimatic environment of soil. In a Pinus tabulaeformis plantation and an adjacent Quercus aliena var. acuteserrata shrub, which are located in a dry-hot valley region of Minjiang River in the Southwest of China, the daily soil CO_2 emission dynamics was measured in August 2004 and in May, July, and October 2005. The results showed that the soil CO_2 emission in the oak shrub was significantly higher than the pine plantation in each measurement period. Additionally, soil organic matter, microbial biomass carbon, and the leaf litter decomposition rate in the two vegetations differed significantly from each other. The variation of soil organic matter and microbial biomass carbon partially contributed to the evident difference in soil CO_2 emission. Moreover, the correlations between soil CO_2 emission, soil temperature, and soil water content were evaluated in this study. The soil temperature positively controlled soil CO_2 emission in the pine plantation and the oak shrub, while the soil water content negatively influenced soil CO_2 emission in the two vegetation types. However, the soil temperature and soil water content played varied roles in the different vegetation types. By the means of stepwise regression, the soil temperature more significantly influenced the dynamics of soil CO_2 emission for the plantation than the soil water content; oppositely, the soil water content was the more significant controlling factor for the shrub. Based on the exponent model between the soil CO_2 emission and soil temperature, the Q_(10) values were estimated, which was 1.7 in the pine plantation and 3.0 in the oak shrub. The former was lower than the global average level of 2.0, whereas the latter was higher than the global average level.
机译：不同植物类型的土壤CO_2排放量差异很大，可能改变土壤的微气候环境。在油松人工林和邻近的栎木无性系中。分布在中国西南Min江干热河谷地区的尖锐湿地灌丛，分别于2004年8月和2005年5月，7月和2005年10月测量了土壤每天的CO_2排放动态。结果表明，土壤CO_2在每个测量期间，橡木灌木丛中的排放量均显着高于松树种植园。此外，两种植被的土壤有机质，微生物生物量碳和枯枝落叶分解速率也存在显着差异。土壤有机质和微生物生物量碳的变化部分导致了土壤CO_2排放量的明显差异。此外，本研究还评估了土壤CO_2排放，土壤温度和土壤水分之间的相关性。土壤温度对松树人工林和橡树灌木林土壤CO_2的排放有积极的控制作用，而土壤水分对两种植被类型的土壤CO_2的排放有不利的影响。但是，土壤温度和含水量在不同的植被类型中起着不同的作用。通过逐步回归，土壤温度对土壤CO 2排放动态的影响远大于土壤水分。相反，土壤水分是灌木的重要控制因子。根据土壤CO_2排放与土壤温度之间的指数模型，估算出Q_（10）值，其中松树人工林为1.7，橡树灌木为3.0。前者低于全球平均水平2.0，而后者高于全球平均水平。

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