| 李艾蒙,李慧,裴久渤,谢柠桧,刘雨薇,汪景宽.玉米秸秆施用对棕壤有机碳激发效应及温度敏感性的影响[J].农业环境科学学报,2019,38(12):2788-2796. |
| 玉米秸秆施用对棕壤有机碳激发效应及温度敏感性的影响 |
| Effects of maize straw application on organic carbon's priming effect and temperature sensitivity in brown earth |
| 投稿时间：2019-07-09 |
| DOI：10.11654/jaes.2019-0767 |
| 中文关键词: 13C标记玉米秸秆 土壤有机碳 激发效应 温度敏感性 |
| 英文关键词: 13C-labeled maize straw soil organic carbon priming effect temperature sensitivity |
| 基金项目:国家重点研发计划子课题（2017YFD0200604）；国家自然科学基金项目（41807086，41671293）；辽宁省自然科学基金项目（20170540799）；沈阳农业大学博士启动基金项目（880416042，880416020） |
| 作者 | 单位 | E-mail | | 李艾蒙 | 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 | | | 李慧 | 沈阳农业大学林学院, 沈阳 110866 | | | 裴久渤 | 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 | peijiubo@syau.edu.cn | | 谢柠桧 | 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 | | | 刘雨薇 | 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 | | | 汪景宽 | 沈阳农业大学土地与环境学院, 土肥资源高效利用国家工程实验室, 农业部东北耕地保育重点实验室, 沈阳 110866 | |
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| 中文摘要: |
| 为了区分新加入玉米秸秆碳对原土壤有机碳激发效应及其温度敏感性的影响。本研究利用13C示踪方法，通过向高肥（连续施用腐熟猪厩肥30年，土壤有机碳含量17.03 g·kg-1）与低肥（连续30年不施肥处理，有机碳含量10.70 g·kg-1）棕壤中添加13C标记的玉米秸秆，在25℃（微生物适宜温度）和18℃（作物生长季平均温度）进行450 d的室内培养试验，定期测定CO2-C和CO2-13C，探讨玉米秸秆碳矿化对不同肥力棕壤有机碳激发效应及其温度敏感性的影响。高肥棕壤有机碳的累积矿化量较高，且温度升高增加了棕壤有机碳的累积矿化量；低肥棕壤有机碳激发效应程度随温度升高的变化大于高肥棕壤，表现出0~140 d正激发效应程度下降更快，140~360 d负激发效应程度持续时间更长，360 d后正激发效应程度呈逐渐增大的趋势，其中18℃累积激发效应程度大于25℃；总体上高肥和低肥棕壤有机碳矿化的温度敏感性均呈现随时间逐渐下降的趋势，而玉米秸秆添加显著减缓了它们的下降，并表现出0~140 d低肥棕壤有机碳矿化的温度敏感性高于高肥棕壤，之后低于高肥棕壤的趋势，原土壤有机碳矿化的温度敏感性呈现出较大的变化，表现为0~300 d低肥棕壤高于高肥，之后呈相反的趋势。土壤肥力（有机碳水平的差异）和环境温度交互影响着玉米秸秆碳的分解，引起了棕壤有机碳激发效应的差异变化，培养140 d和300 d是温度敏感性差异变化的重要时期。 |
| 英文摘要: |
| To distinguish the effects of maize straw carbon(C)on the priming effect(PE)of native soil organic carbon(SOC)and its temperature sensitivity, a laboratory 13C tracing incubation experiment was carried out for 450 days with Brown Earth at 25℃(microbial suitable temperature)and 18℃(average temperature at crop growing season). The CO2-C content and its 13C values were determined periodically after 13C-labeled maize straw was added to high-fertility Brown Earth(HF, continuous application of decomposed pig manure for 30 years)with SOC content of 17.03 g·kg-1, and low-fertility Brown Earth(LF, no fertilizer treatment for 30 years)with SOC content of 10.70 g·kg-1. The results showed that the accumulation of SOC in HF was higher, and higher temperature increased the cumulative mineralization of SOC. The relative PE of SOC with LF changed owing to the increase in temperature, showing a trend of relatively positive PE that quick declined from 0 to 140 days, longer duration of negative PE from 140 to 360 days, and slightly higher positive PE after 360 days. Meanwhile, the cumulative relative PE was higher at 18℃ than at 25℃. In general, the temperature sensitivity of SOC both in HF and LF decreased over time. The addition of maize straw could slow down the declining trend. The temperature sensitivity of SOC in LF was higher than in HF before 140 days; the trend reversed after 140 days. The temperature sensitivity from native SOC presented strong variations, which were higher in LF than in HF from 0 to 300 days; the trend reversed after 300 days. These results suggest that the decomposition of maize straw was influenced by soil fertility(different SOC levels)and environment temperature, resulting in variations in the PE of SOC. The incubation times of 140 days and 300 days should be the important time variations. |
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