以大兴安岭地区针阔混交低质林、山杨低质林、蒙古栎低质林、白桦低质林、阔叶混交低质林为研究对象，采用LI-8150多通道土壤呼吸自动测量系统测定了不同类型低质林土壤呼吸速率的日变化，并测定了观测点的土壤温度、湿度、理化性质以及枯落物。结果表明：不同类型低质林土壤呼吸速率差异显著，土壤呼吸速率白天均高于夜晚，1 d中最高值出现在12：00-14：00，最低值出现在23：00-03：00，土壤呼吸速率与土壤温度的关系适合指数模型（R2为0．73～0．82），土壤呼吸速率与土壤温度和土壤湿度呈显著的二次曲线关系（R2为0．61～0．85），土壤温湿度双因子复合模型能更好解释不同类型低质林土壤呼吸速率的差异。土壤呼吸速率与土壤总孔隙度、有机质质量分数存在显著的正相关性，与土壤pH值、氮质量分数及半分解枯落物蓄积量相关性也较高。%We measured the change of soil respiration rate by using soil respiration measurement LI-8150, and the soil tempera-ture, soil moisture, soil physical and chemical properties, litter in five typical low-quality forest stands including mixed co-nifer and broadleaved forest, Populus davidiana forest, Quercus mongolica forest, Betula platyphylla forest and broadleaved mixed forest in Daxing’ an Mountains.The soil respiration rates were significantly different between different types of low-quality forest.The soil respiration rates during the day were higher than that in the night, the highest rate occurred from 12:00 to 14:00, and the lowest rate occurred between 23:00 to 3:00.Exponential model was suitable to the relation be-tween soil respiration rate and soil temperature ( with R2 of 0.73-0.82) , soil respiration rate and soil moisture was quadrat-ic curve relationship ( with R of 0.61-0.85) , soil temperature and moisture complex double factor model could better ex-plain the differences of different types of low-quality forest soil respiration rate.There were significant positive correlations between soil respiration rate and soil total porosity, organic matter content, and there were higher correlations between soil respiration rate and soil pH, nitrogen content, and amount of semi-decomposed litter.
展开▼
