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Quantifying Components of Soil Respiration and Their Response to Abiotic Factors in Two Typical Subtropical Forest Stands Southwest China

机译：西南两种典型亚热带林分土壤呼吸的定量组成及其对非生物因子的响应

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Separating the components of soil respiration and understanding the roles of abiotic factors at a temporal scale among different forest types are critical issues in forest ecosystem carbon cycling. This study quantified the proportions of autotrophic (R A) and heterotrophic (R H) in total soil (R T) respiration using trenching and litter removal. Field studies were conducted in two typical subtropical forest stands (broadleaf and needle leaf mixed forest; bamboo forest) at Jinyun Mountain, near the Three Georges Reservoir in southwest China, during the growing season (Apr.–Sep.) from 2010 to 2012. The effects of air temperature (AT), soil temperature (ST) and soil moisture (SM) at 6cm depth, solar radiation (SR), pH on components of soil respiration were analyzed. Results show that: 1) SR, AT, and ST exhibited a similar temporal trend. The observed abiotic factors showed slight interannual variability for the two forest stands. 2) The contributions of R H and R A to R T for broadleaf and needle leaf mixed forest were 73.25% and 26.75%, respectively, while those for bamboo forest were 89.02% and 10.98%, respectively; soil respiration peaked from June to July. In both stands, CO2 released from the decomposition of soil organic matter (SOM), the strongest contributor to R T, accounted for over 63% of R H. 3) AT and ST were significantly positively correlated with R T and its components (p<0.05), and were major factors affecting soil respiration. 4) Components of soil respiration were significantly different between two forest stands (p<0.05), indicating that vegetation types played a role in soil respiration and its components.
机译：分离土壤呼吸的成分并了解不同森林类型在时间尺度上非生物因子的作用是森林生态系统碳循环的关键问题。这项研究使用挖沟和清除垃圾的方法量化了自养（R A）和异养（R H）在整个土壤（R T）呼吸中的比例。在2010年至2012年的生长季节（4月至9月），在中国西南三乔治水库附近的Jin云山，对两个典型的亚热带森林林分（阔叶和针叶混交林；竹林）进行了田野研究。分析了6cm深度的气温（AT），土壤温度（ST）和土壤水分（SM），太阳辐射（SR），pH对土壤呼吸成分的影响。结果表明：1）SR，AT和ST表现出相似的时间趋势。观察到的非生物因子显示两个林分的年际变化很小。 2）阔叶和针叶混交林的R H和RA对RT的贡献分别为73.25％和26.75％，而竹林的R H和RA对R T的贡献分别为89.02％和10.98％；土壤呼吸在6月至7月达到峰值。在两个林分中，从土壤有机质（SOM）分解中释放出的CO2是RT的最强贡献，占R H的63％以上。3）AT和ST与RT及其组分显着正相关（p <0.05） ），是影响土壤呼吸的主要因素。 4）两个林分之间土壤呼吸的组成差异显着（p <0.05），表明植被类型在土壤呼吸及其组成中起着重要作用。

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