中文关键词雪岭云杉土壤呼吸土壤温度土壤湿度碳输入 英文关键词Picea schrenkianasoil respirationsoil temperaturesoil moisturecarbon input

作者	单位	E-mail
邵康	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046	shawkang@126.com
贡璐	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046	gonglu721@163.com
何学敏	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046
陈文静	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046
张雪妮	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046
朱海强	新疆大学资源与环境科学学院, 乌鲁木齐 830046 绿洲生态教育部重点实验室, 乌鲁木齐 830046

中文摘要 探究外源性碳输入改变对森林土壤呼吸的影响是深入解析森林碳循环的基础.本研究基于植物残体添加和去除控制实验，设置5种不同碳输入（对照组、双倍凋落物组、去根组、去凋落物组和去根去凋落物组）处理，研究了天山雪岭云杉林（Picea Schrenkiana）生长季土壤呼吸对碳输入改变的短期响应.结果表明，整个实验期间对照、双倍凋落物、去根、去凋和去根去凋处理土壤呼吸速率均值分别为3.38、3.94、2.65、2.87和2.01μmol·（m²·s）^-1；与对照处理相比，双倍凋落物处理使累计土壤呼吸通量增加402.65 g·m^-2，去根、去凋和去根去凋处理分别减少了515.00、354.73和967.15 g·m^-2，减少幅度为去根去凋 > 去根 > 去凋.整个实验期间相对于对照组，双倍凋落物处理下土壤呼吸速率平均增加20.35%，去凋、去根、去根去凋处理下土壤呼吸速率分别平均降低14.40%、20.78%和40.83%.土壤矿质呼吸、凋落物呼吸和根系呼吸对土壤总呼吸的相对贡献率由大至小依次为：土壤矿质呼吸（59.46%） > 根系呼吸（21.49%） > 凋落物呼吸（14.79%）.由主成分分析可知，土壤呼吸速率的变化与土壤温度、土壤湿度、全磷、pH值、土壤有机碳正相关，与土壤容重负相关，而全氮、碳氮比和土壤电导率对土壤呼吸速率影响不大. 英文摘要 The impact of exogenous carbon input changes on forest soil respiration provides the basis for an intensive analysis of the forest carbon cycle. Based on a plant residue addition and removal control experiment, this study investigated the short-term soil respiration response to carbon input changes of Picea schrenkiana on the Tianshan Mountains during their growing season with five different carbon input treatments:control, double litter, no root, no litter, and no input. The results revealed that, during the entire observation period, the cumulative soil respiration rates were 3.38, 3.94, 2.65, 2.87, and 2.01 μmol·(m²·s)^-1 in the double litter, control, no litter, no root, and no input treatments, respectively. Compared with the control treatment, the cumulative soil CO₂ efflux increased by 402.65 g·m^-2 in the double litter treatment, whereas it decreased by 515.00, 354.73, and 967.15 g·m^-2 in the no litter, no root, and no input treatments, respectively. The mineral soil respiration, litterfall respiration, and root respiration contributed 59.46%, 21.49%, and 14.79%, respectively, to the total soil respiration rate. PCA analysis revealed that the soil respiration rate was positively correlated with the soil temperature, soil moisture, soil total phosphorus content, pH, and soil organic carbon content, and negatively correlated with the soil bulk density, while the soil total nitrogen content, carbon nitrogen ratio, and soil electrical conductivity had no effect on the soil respiration rate.

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