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Estimation of soil respiration in a paddy ecosystem in the subtropical region of China

机译：中国亚热带稻田生态系统中土壤呼吸的估算

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摘要

Water vapor, energy exchange, and CO_2 flux were measured continuously from 2003 to 2005 using the eddy covariance technique in a paddy ecosystem in the subtropical region of China. The CO_2 fluxes at nighttime during fallow periods (from middle October to late April) were used to analyze the dynamics of soil respiration and its relationship with soil temperature, and to simulate the annual dynamics of soil respiration in paddy ecosystems. The variation of soil respiration showed a clear seasonal pattern. The soil respiration rates at night during the fallow periods were 52—398 mg·m~(-2)·h~(-1), and exponentially correlated (P ＜ 0.001) with soil temperatures at different depths of soil (5,10, and 20 cm), particularly the temperature measured at a depth of 5 cm. Based on the simulated exponential equations developed, annual average soil respiration rates and total soil respiration of paddy soil in the subtropical region of China were estimated to be 178.5—259.9 mg.m~(-2)·h~(-1) and 1.56—2.28 kg·m~(-2)·a~(-1), respectively. The simulation equations can be applied to evaluating soil respiration in paddy ecosystems during the rice-growing season.
机译：2003年至2005年，利用涡度协方差技术对中国亚热带稻田生态系统中的水汽，能量交换和CO_2通量进行了连续测量。休耕期（10月中旬至4月下旬）夜间CO_2通量用于分析土壤呼吸动力学及其与土壤温度的关系，并模拟稻田生态系统中土壤呼吸的年度动态。土壤呼吸变化表现出明显的季节格局。休耕期夜间土壤呼吸速率为52〜398 mg·m〜（-2）·h〜（-1），且与土壤不同深度的土壤温度呈指数相关（P ＜0.001）（5,10和20厘米），特别是在5厘米深度处测量的温度。根据建立的模拟指数方程，中国亚热带地区水稻土的年平均土壤呼吸速率和总土壤呼吸速率估计为178.5—259.9 mg.m〜（-2）·h〜（-1）和1.56分别为-2.28kg·m〜（-2）·a〜（-1）。该模拟方程可用于评估水稻生长期稻田生态系统中的土壤呼吸。

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