| 土壤水分和植物残体对紫色水稻土有机碳矿化的影响 |
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| 引用本文： | 张薇,王子芳,王辉,郑杰炳,鲍金星,高明.土壤水分和植物残体对紫色水稻土有机碳矿化的影响[J].植物营养与肥料学报,2007,13(6):1013-1019. |
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| 作者姓名： | 张薇 王子芳 王辉 郑杰炳 鲍金星 高明 |
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| 作者单位： | 1.西南大学资源环境学院 重庆400716; |
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| 基金项目： | 国家自然科学基金;重庆市自然科学基金 |
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| 摘 要： | 采用为期62.d的实验室恒温(281)℃培养方法,研究了土壤水分和植物残体对紫色水稻土有机碳矿化的影响。结果表明,紫色水稻土有机碳矿化速率在培养30.d后基本达到稳定,好气条件下土壤有机碳累积矿化量高于淹水条件,且差异达到极显著水平。用一级动力学方程对植物残体的矿化速率进行拟合表明,好气条件下,植物残体的分解速率常数(k值)大小顺序为蚕豆秸秆玉米秸秆水稻秸秆,而淹水条件则为水稻秸秆蚕豆秸秆玉米秸秆。水分状况和植物残体化学组分的差异影响紫色水稻土中有机碳的动态变化,最终导致碳累积矿化量差异。
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| 关 键 词： | 矿化 植物残体 土壤水分 紫色水稻土 有机碳 |
| 文章编号： | 1008-505X（2007）06-1013-07 |
| 收稿时间： | 2006-11-08 |
| 修稿时间： | 2007-01-22 |
Organic carbon mineralization affected by water content and plant residues in purple paddy soil |
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| ZHANG Wei,WANG Zi-fang,WANG Hui,ZHENG Jie-bing,BAO Jin-xing,GAO Ming.Organic carbon mineralization affected by water content and plant residues in purple paddy soil[J].Plant Nutrition and Fertilizer Science,2007,13(6):1013-1019. |
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| Authors: | ZHANG Wei WANG Zi-fang WANG Hui ZHENG Jie-bing BAO Jin-xing GAO Ming |
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| Affiliation: | 1.College of Resources and Environment;Southwest Agricultural University;Chongqing 400716;China; |
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| Abstract: | Water content and plant residues play crucial roles in the accumulation and mineralization of soil organic carbon(SOC),and thus affect C mineralization and nutrient availability in paddy field ecosystems.In this paper,we evaluated the combined impacts of soil water content and plant residues on C mineralization in the purple paddy soil,using laboratory incubations at constant temperature(28±1)℃ for 62 days.Results showed that the mineralization rate of organic C in the purple paddy soil reached a steady level after 30 d incubation.The accumulative evolution amount of CO2-C in the aerobic treatments was significantly higher than those in the submergence treatments(P<0.01).The kinetic rate of plant residues mineralization could be quantitatively described by the firstorder kinetics equation.The decomposition rate constants(k) of plant residues was in the order of faba bean(Vicia faba) residues > maize(Zea mays) residues > rice(Oryza sativa) resides in the aerobic treatments,and rice resides > faba bean residues > maize residues in the submergence treatments.In summary,soil water content and chemical composition of plant residues significantly affect C dynamics,and thus affect accumulative mineralized amount of CO2-C. |
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| Keywords: | mineralization plant residues soil water content purple paddy soil organic carbon |
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