论文部分内容阅读
采用静态箱-气相色谱法对浙江省临安市玲珑山风景区天然阔叶林和由天然阔叶林改造的杉木人工林的土壤呼吸进行1年的定位监测.结果表明:天然阔叶林和杉木人工林土壤CO2排放速率均呈现一致的季节性变化规律即夏秋季高、冬春季低;天然阔叶林和杉木人工林土壤CO2排放速率分别为20.0~111.3和4.1~118.6 mg C·m-2·h-1;天然阔叶林土壤CO2年累积排放通量(16.46 t CO2·hm-2·a-1)显著高于杉木人工林(11.99 t CO2·hm-2·a-1).天然阔叶林和杉木人工林土壤CO2排放速率与土壤含水量均没有显著相关性,而与5cm处土壤温度呈显著指数相关,Q10值分别为1.44和2.97;天然阔叶林土壤CO2排放速率与土壤水溶性碳(WSOC)含量无显著相关性,杉木人工林土壤CO2排放速率与WSOC含量呈显著相关.天然阔叶林转换为杉木人工林显著降低了土壤CO2排放,提高了土壤呼吸对环境因子的敏感性.
Using static box-gas chromatography (GC-MS), the soil respiration of natural broad-leaved forest in Linglong Mountain Scenic Area, Linyi City, Zhejiang Province and fir plantation rehabilitated by natural broad-leaved forest was monitored for one year. The results showed that natural broad-leaved forest and Chinese fir The CO2 emission rate of plantations showed consistent seasonal variation, ie high in summer and autumn and low in winter and spring. The soil CO2 emission rates in natural broad-leaved and Chinese fir plantations were 20.0-1111.3 and 4.1-118.6 mg C · m-2, respectively · H-1, and annual accumulated CO2 emission (16.46 t CO2 · hm-2 · a-1) in natural broad-leaved forest was significantly higher than that in Chinese fir plantation (11.99 t CO2 · hm-2 · a- There was no significant correlation between soil CO2 emission rate and soil water content in broadleaved forest and Chinese fir plantation, but significant exponential correlation with soil temperature at 5cm, Q10 values were 1.44 and 2.97 respectively. Soil CO2 emission rate in natural broad-leaved forest was similar to soil There was no significant correlation between WSOC content and WSOC content in Chinese fir plantations.The conversion of natural broad-leaved forests to Cunninghamia lanceolata plantation significantly reduced soil CO2 emissions and increased the effects of soil respiration on environmental factors Sensitivity.