Effects of soil moisture content on the mineralization of added 14C-labbelled straw and native soil organic carbon in upland soil
2006
Tang Guoyong, Tong Chengli, Su Yirong
中国人. 研究土壤含水量与土壤有机碳矿化的关系。标准培养条件（25℃，100%空气湿度）下，应用14C示踪技术研究了6个水分梯度下（30%、45%、60%、75%、90%和105%WHC，WHC为最大田间持水量）添加物料和旱地土壤有机碳的矿化特征。在100 d的培养期内，添加物料和土壤原有有机碳的累积矿化量随含水量的提高而增加，且与含水量呈极显著正线性相关关系。在105%WHC的处理中，添加物料和土壤有机碳的累积矿化量均最大，为146 andmicro;g/g和0.76 mg/g，是其它处理中添加物料和土壤有机碳矿化量的1.24～1.68和1.33～3.01倍。100 d内，添加物料的矿化率约20%～33%，土壤有机碳的矿化率约1.0%～3.1%。在30%～105%WHC的范围内，含水量对土壤原有有机碳矿化量的影响更明显，且渍水促进添加物料和旱地土壤有机碳的矿化。
显示更多 [+] 显示较少 [-]英语. Soil water plays a crucial role in the accumulation and mineralization of soil organic carbon (SOC). In laboratory, 14C-labelled rice straw was added into upland soil and incubated under 30%, 45%, 60%, 75%, 90% and 105% water holding capacity (WHC) at 25℃, 100% air humidity for 100 days. The accumulative mineralized amount of added organic materials (AOM) and native SOC both increased as moisture content increased from 30% to 105% WHC, and their relationships were positively linear correlation (n=6, R2 =0.9174, P0.001 and n
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