皖西大别山区3种林分类型土壤呼吸变化规律研究

Characteristics of soil respiration of three forests in Dabieshan Mountains in Western Anhui

对安徽省亚热带山区杉木林、麻栎林、混交林3种林分类型土壤呼吸变化的研究结果表明:3种林分类型土壤的呼吸速率以秋季最大、冬季最小;土壤呼吸速率与20 cm高度处空气温度的相关性高于与150 cm处温度的相关性;土壤呼吸与5 cm土层温度呈正相关关系,其相关系数杉木林为0.550、麻栎林为0.503、混交林为0.561,均达到极显著水平。土壤呼吸速率与0～5 cm土层土壤有机质含量呈正相关关系,相关系数杉木林为0.853、麻栎林为0.925、混交林为0.963,均达到显著水平。

The purpose of this study was investigating the characteristics of soil respiration of three subtropical forests in Dabieshan Mountains, western Anhui. The results showed that, in autumn, the soil respiration rates in the three forests were the highest and in winter, were the lowest. The correlation between soil respiration rate and air temperature at 20cm above the ground was higher than at 150cm above the ground. The soil respirations were positively correlated with the temperature of soil in the depth of 5cm, and their coefficients were, respectively, 0.550 （p〈0.01）for Cunninghamia lanceolata, 0.503 （p〈0.01）for Quereus acutissima stands and 0.561 （p〈0.01）for the mixture of Cunninghamia lanceolata and Quercus acutissimao The soil respiration rate was positively correlated with 0-5cm layer of sawtooth oak forest, and their coefficients were, respectively, 0.853 （p〈0.05）for Cunninghamia lanceolata, 0.925 （p〈0.05）for Quercus acutissima stands and 0.963 （p〈0.05）for the mixture of Cunninghamia lanceolata and Quercus acutissima.