添加葡萄糖对不同深度红壤碳矿化及其温度敏感性的影响
发布时间:2018-05-22 10:52
本文选题:土层深度 + 土壤碳矿化速率 ; 参考:《土壤通报》2017年05期
【摘要】:土壤碳矿化速率及温度敏感性是研究陆地生态系统碳循环的重要指标,以往研究多集中在表层土壤,但不同深度土壤属性及碳质量具有显著的差异。以亚热带马尾松/木荷人工混交林红壤为研究对象,选择0~10 cm、10~30 cm、30~60 cm和60~100 cm四种深度土壤,设置葡萄糖添加(G+)和空白对照(CK)两组处理,进行周期性变温(4、14、22和30℃)培养,并利用自主研发设备测定第1、3、7、14、21和28天5~30℃模拟昼夜周期性变温条件下的土壤碳矿化速率,研究添加葡萄糖对不同红壤碳矿化速率及其温度敏感性(Q10)的影响。结果表明:无葡萄糖添加时,随着土壤深度和培养时间增加,土壤碳矿化速率显著降低,但Q10无显著差别,培养后期底物供给不足限制了土壤碳矿化速率。葡萄糖添加后,随着土壤深度增加,土壤碳矿化速率及Q10均显著增加,浅层土壤响应较快,深层土壤响应慢但增幅更大。培养末期深层土壤碳矿化速率甚至高于表层土壤。不同深度土壤微生物含量及其群落结构组成是土壤碳矿化速率及其Q10响应差异的主要影响因素。
[Abstract]:Soil carbon mineralization rate and temperature sensitivity are important indexes to study the carbon cycle in terrestrial ecosystem. In the past, most of the studies focused on the surface soil, but there were significant differences in soil properties and carbon quality among different depths. The red soil of artificial mixed forest of Pinus massoniana and Schima superba was used as the research object. Four kinds of soil depth, 0 ~ 10 cm ~ (10 cm) ~ (10 ~ (30) cm ~ (-1) ~ (30) cm ~ (-1) and 60 ~ (100) cm) were selected, and two groups of treatments (glucose + G) and blank control group (CK) were used to culture the soil with periodic variation of temperature (4 ~ (14) ~ (22) and 30 鈩,
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