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Rates of Litter Decomposition and Soil Respiration in Relation to Soil Temperature and Water in Different-Aged Pinus massoniana Forests in the Three Gorges Reservoir Area China

机译：三峡库区不同年龄马尾松林凋落物分解和土壤呼吸速率与温度和水分的关系

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摘要

To better understand the soil carbon dynamics and cycling in terrestrial ecosystems in response to environmental changes, we studied soil respiration, litter decomposition, and their relations to soil temperature and soil water content for 18-months (Aug. 2010–Jan. 2012) in three different-aged Pinus massoniana forests in the Three Gorges Reservoir Area, China. Across the experimental period, the mean total soil respiration and litter respiration were 1.94 and 0.81, 2.00 and 0.60, 2.19 and 0.71 µmol CO2 m−2 s−1, and the litter dry mass remaining was 57.6%, 56.2% and 61.3% in the 20-, 30-, and 46-year-old forests, respectively. We found that the temporal variations of soil respiration and litter decomposition rates can be well explained by soil temperature at 5 cm depth. Both the total soil respiration and litter respiration were significantly positively correlated with the litter decomposition rates. The mean contribution of the litter respiration to the total soil respiration was 31.0%–45.9% for the three different-aged forests. The present study found that the total soil respiration was not significantly affected by forest age when P. masonniana stands exceed a certain age (e.g. >20 years old), but it increased significantly with increased soil temperature. Hence, forest management strategies need to protect the understory vegetation to limit soil warming, in order to reduce the CO2 emission under the currently rapid global warming. The contribution of litter decomposition to the total soil respiration varies across spatial and temporal scales. This indicates the need for separate consideration of soil and litter respiration when assessing the climate impacts on forest carbon cycling.
机译：为了更好地了解陆地生态系统中土壤碳动态和响应环境变化的循环，我们研究了18个月（2010年8月至2012年1月）中土壤呼吸，凋落物分解及其与土壤温度和土壤水分的关系。三峡库区三大不同年龄的马尾松林。在整个实验期间，土壤平均总呼吸和凋落物呼吸分别为1.94和0.81、2.00和0.60、2.19和0.71 µmol CO2 m −2 s −1 ，在20岁，30岁和46岁的森林中，枯枝落叶剩余量分别为57.6％，56.2％和61.3％。我们发现，土壤呼吸和凋落物分解速率的时间变化可以用5 cm深度的土壤温度很好地解释。土壤总呼吸和凋落物呼吸与凋落物分解率均呈显着正相关。在三种不同年龄的森林中，凋落物呼吸对土壤总呼吸的平均贡献为31.0％–45.9％。本研究发现，当马森假单胞菌超过一定年龄（例如> 20岁）时，总土壤呼吸不受森林年龄的显着影响，但随着土壤温度的升高而显着增加。因此，森林管理策略需要保护地下植被，以限制土壤变暖，以便在当前快速的全球变暖下减少二氧化碳的排放。凋落物分解对土壤总呼吸的贡献在空间和时间尺度上变化。这表明在评估气候对森林碳循环的影响时，需要分别考虑土壤和凋落物的呼吸作用。

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