Shao Kang, Gong Lu, He Xue-Min, Chen Wen-Jing, Zhang Xue-Ni, Zhu Hai-Qiang
College of Resources and Environmental Sciences, Xinjiang University, Urumqi 830046, China.
Key Laboratory of Oasis Ecological Ministry of Education, Urumqi 830046, China.
Huan Jing Ke Xue. 2020 Aug 8;41(8):3804-3810. doi: 10.13227/j.hjkx.202001091.
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 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·(m·s) in the double litter, control, no litter, no root, and no input treatments, respectively. Compared with the control treatment, the cumulative soil CO efflux increased by 402.65 g·m in the double litter treatment, whereas it decreased by 515.00, 354.73, and 967.15 g·m 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.
外源碳输入变化对森林土壤呼吸的影响为深入分析森林碳循环提供了依据。基于一项植物残体添加与去除控制实验，本研究调查了天山地区生长季期间五种不同碳输入处理（对照、双倍凋落物、无根、无凋落物、无输入）下土壤呼吸对碳输入变化的短期响应。结果表明，在整个观测期内，双倍凋落物、对照、无凋落物、无根和无输入处理的累积土壤呼吸速率分别为3.38、3.94、2.65、2.87和2.01 μmol·(m·s)。与对照处理相比，双倍凋落物处理的累积土壤CO₂通量增加了402.65 g·m，而无凋落物、无根和无输入处理的累积土壤CO₂通量分别减少了515.00、354.73和967.15 g·m。矿质土壤呼吸、凋落物呼吸和根系呼吸分别占土壤总呼吸速率的59.46%、21.49%和14.79%。主成分分析表明，土壤呼吸速率与土壤温度、土壤湿度、土壤总磷含量、pH值和土壤有机碳含量呈正相关，与土壤容重呈负相关，而土壤全氮含量、碳氮比和土壤电导率对土壤呼吸速率没有影响。
