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利用Li-8100土壤碳通量测量系统,研究了2013年4月—2014年3月浙江临安市毛竹人工林土壤呼吸、异养呼吸和自养呼吸速率的动态变化规律.结果表明:毛竹人工林土壤总呼吸速率、异养呼吸速率和自养呼吸速率均呈现出明显的季节变化特征,最高值出现在7月,最低值出现在1月,年平均值分别为2.93、1.92和1.01μmol CO2·m-2·s-1.毛竹林土壤总呼吸、异养呼吸和自养呼吸年累积CO2排放量分别为37.25、24.61和12.64 t CO2·hm-2·a-1.土壤呼吸各组分均与土壤5 cm温度呈显著指数相关,土壤总呼吸、异养呼吸和自养呼吸的温度敏感系数Q10值分别为2.05、1.95和2.34.土壤总呼吸速率、异养呼吸速率与土壤水溶性有机碳(WSOC)含量均呈显著相关,而自养呼吸与WSOC无显著相关性;土壤呼吸各组分与土壤含水量以及微生物生物量碳均无显著相关性.土壤温度是影响毛竹人工林土壤呼吸及其组分季节变化的主要驱动因子,土壤WSOC含量是影响土壤总呼吸和异养呼吸的重要环境因子.
Using Li-8100 soil carbon flux measurement system, the dynamic changes of soil respiration, heterotrophic respiration and autotrophic respiration of the Phyllostachys pubescens plantation in Lin’an City, Zhejiang Province from April 2013 to March 2014 were studied. The results showed that: The soil total respiration rate, heterotrophic respiration rate and autotrophic respiration rate showed obvious seasonal variation characteristics, the highest value appeared in July and the lowest value appeared in January, with annual average values of 2.93, 1.92 and 1.01 μmol · · · m-2 · s-1. The total annual CO2 emissions from soil respiration, heterotrophic respiration and autotrophic respiration were 37.25, 24.61 and 12.64 t CO2 · hm-2 · a-1, respectively And the temperature of 5 cm of soil were significantly exponential. The Q10 values of soil total respiration, heterotrophic respiration and autotrophic respiration were 2.05, 1.95 and 2.34, respectively. The total soil respiration rate, heterotrophic respiration rate and soil water-soluble organic carbon (WSOC), while there was no significant correlation between autotrophic respiration and WSOC. There was no significant correlation between soil respiration and soil moisture and microbial biomass carbon. Soil temperature influenced the soil respiration of the plantation Seasonal changes in its components Of the main driving factors, soil WSOC content is the impact of total soil respiration and heterotrophic respiration of the important environmental factors.