在气候变暖的背景下,土壤有机碳分解温度敏感性(Q10)的研究主要集中在表层土壤,而深层土壤有机碳分解特征及其控制因子还未得到充分的认识,这将会明显增加陆地生态系统土壤碳库—气候反馈的强度和方向预测的不确定性。
图1.不同海拔和土层间Q10值的分布,Q10-cum,基于128天累积培养呼吸计算;Q10-q,基于累积消耗碳组分0-0.1%、0.2-0.3%、0.4-0.5%计算;Q10-k基于模型模拟快库、慢库、惰库计算。
表1.海拔和土层对不同Q10的影响
研究结果发现不同海拔和不同土层土壤有机碳的化学稳定性和物理化学稳定性都存在显著差异。高海拔地区(海拔3600米以上的冷杉林和高山草甸)土壤有机碳的化学抗性高于低海拔地区。土壤有机碳分解的Q10受土壤深度和海拔高度的显著影响。而深度对Q10的影响远小于海拔梯度对Q10的影响。高海拔地区土壤有机碳矿化的温度敏感性高于低海拔地区。
图2.随机森林模型明确气候因素、土壤理化性质、化学组分和物理保护对Q10-q的影响
土壤有机碳的化学性质在土壤有机碳矿化温度敏感性的变异中起主要解释作用,其中有机碳疏水性、累积矿化碳组分和烷基碳/氧烷基碳比率为重要性前三的土壤有机碳化学性质;土壤有机碳物理保护作用次之。
图3.气候、土壤理化性质、化学组分和物理保护对Q10的影响
UPGRADED!
可进行恒温或变温培养设定;
温度控制波动优于±0.05℃;
平均升降温速率不小于1°C/min;
150ml样品瓶适配25位样品盘;
具有CO2预降低的双回路设计;
一体化设计,内置CO2 H2O模块;
可以外接浓度和同位素分析仪等。
02 PRI-8800 实验设计
03 PRI-8800相关文献信息
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