| 变温环境对典型石灰土有机碳矿化的影响 |
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| 引用本文： | 王莲阁,高岩红,丁长欢,慈恩,谢德体.变温环境对典型石灰土有机碳矿化的影响[J].环境科学,2014,35(11):4291-4297. |
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| 作者姓名： | 王莲阁 高岩红 丁长欢 慈恩 谢德体 |
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| 作者单位： | 西南大学资源环境学院，重庆 400715; 重庆市三峡库区农业面源污染控制工程技术研究中心，重庆 400715 |
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| 基金项目： | 国家自然科学基金项目，中国科学院战略性先导科技专项，中央高校基本科研业务费专项，重庆市环境保护局环保科技项目 |
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| 摘 要： | 采用野外采样和室内培养试验,研究了不同土地利用类型(林地和旱地)下的石灰土表层土壤有机碳(SOC)矿化对变温环境的响应.两种供试土样分别采自贵州省普定县天龙山区域的典型林地和旱地的0~10 cm表层.在培养试验中,依据积温相同的原则,设置变温(范围:15~25℃,变温间隔12 h)和恒温(20℃)两个温度处理,培养时间为56 d.在整个培养期内,旱地石灰土变温处理的SOC累积矿化量(63.32 mg·kg-1)虽略低于恒温处理(63.96 mg·kg-1),但两者之间差异不显著,而森林石灰土变温处理的SOC累积矿化量(169.46 mg·kg-1)则显著低于恒温处理(209.52 mg·kg-1)(P<0.05),这表明不同土地利用类型的石灰土SOC矿化对变温环境的响应不同.受植被和土地利用类型的影响,森林石灰土和旱地石灰土表层的SOC含量和组成差异显著,这可能是导致其SOC矿化对变温环境响应差异的重要原因.另外,各温度处理中,土壤可溶性有机碳(DOC)含量与SOC日均矿化量之间均呈极显著正相关(P<0.01),表明制约土壤DOC生成是温度影响土壤有机碳矿化的一个重要途径.在培养过程中,土壤微生物量碳含量不能有效反映恒温和变温下的SOC矿化差异,结合矿化动力学分析可知,同恒温相比,变温虽然不能通过改变微生物数量来影响SOC矿化,但能通过改变微生物群落的总体活性来影响SOC矿化过程.
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| 关 键 词： | 土壤有机碳 矿化 温度 土地利用 可溶性有机碳 |
| 收稿时间： | 2014/4/15 0:00:00 |
| 修稿时间： | 2014/6/13 0:00:00 |
Effects of Variable Temperature on Organic Carbon Mineralization in Typical Limestone Soils |
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| WANG Lian-ge,GAO Yan-hong,DING Chang-huan,CI En and XIE De-ti.Effects of Variable Temperature on Organic Carbon Mineralization in Typical Limestone Soils[J].Chinese Journal of Environmental Science,2014,35(11):4291-4297. |
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| Authors: | WANG Lian-ge GAO Yan-hong DING Chang-huan CI En and XIE De-ti |
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| Institution: | 1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400715, China;1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400715, China;1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400715, China;1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400715, China;1. College of Resources and Environment, Southwest University, Chongqing 400715, China;2. Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area, Chongqing 400715, China |
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| Abstract: | |
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| Keywords: | soil organic carbon mineralization temperature land use dissolved organic carbon |
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