| 不同通量计算方法对静态箱法测定农田N2O排放通量的影响 |
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| 引用本文： | 石书静,高志岭.不同通量计算方法对静态箱法测定农田N2O排放通量的影响[J].农业环境保护,2012(10):2060-2065. |
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| 作者姓名： | 石书静 高志岭 |
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| 作者单位： | 河北农业大学资源与环境科学学院,河北保定071001 |
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| 基金项目： | 国家自然科学基金（41075105） |
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| 摘 要： | 通过观测冬小麦拔节期施肥后1周内N2O排放,研究了采用静态箱技术时,线性回归（LR）、Quad回归和HM计算方法对N2O排放通量的影响,同时分析了施肥（Nc）和不施肥（CK）对N2O气体交换的影响。结果表明：通过LR、Quad和HM方法处理相同数据得到的N2O排放通量及其特征确实存在较大的差异,由3种方法得到的通量变异系数最高可达到71%;未采用TFU技术校正前,3种计算方法之间的变异系数平均为29%,而校正后则降低到13%;同时还发现,这3种技术均在一定程度上低估了N2O的排放通量,与校正后的排放通量相比,施肥处理中LR、Quad和HM的N2O排放通量分别偏低了14%～31%、5%～48%和3%～62%,对照则分别偏低了14.9%～16.0%、15.5%～35.2%和8.4%～57.2%。因此,采用TUF校正方法不仅可定量分析不同计算方法之间的差异,同时也降低了N2O排放通量的误差。
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| 关 键 词： | 静态箱 冬小麦 排放通量 N2O |
Impact of Different Flux-Calculation Methods on the N_2O Fluxes from Cropland Measured with Static Chamber Technique |
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| SHI Shu-jing,GAO Zhi-ling.Impact of Different Flux-Calculation Methods on the N_2O Fluxes from Cropland Measured with Static Chamber Technique[J].Agro-Environmental Protection,2012(10):2060-2065. |
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| Authors: | SHI Shu-jing GAO Zhi-ling |
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| Institution: | (College of Resources and Environmental Sciences,Agricultural University of Hebei,Baoding 071001,China) |
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| Abstract: | Static chamber techniques have been used widely in characterizing N2O fluxes from arable lands.However,it is still open to question due to the inherent underestimation of fluxes,which have caused large difficulty in reducing the uncertainty associated with the N2O inventory and mitigation practices.In this study,the impact of LR,Quad and HM calculation techniques on the N2O fluxes were examined through measuring N2O fluxes from winter wheat soil with static chamber technique in one week after the N fertilization at shooting stage,and the impacts of N fertilization on N2O fluxes were examined as well.It was found that large variance among the N2O fluxes and patterns obtained with different calculation techniques were observed when using the same dataset,and the greatest coefficient of variation（C.V.）was up to 71%;in comparison with the C.V.of 29% before the correction,it was reduced to be 13% after the performance of TFU technique;it was also obtained that the N2O fluxes were all underestimated,where the underestimation of N2O fluxes by the LR,Quad and HM methods were 14%～31%,5%～48% and 3%～62% for the N fertilized soil,and 14.9%～16.0%,15.5%～35.2% and 8.4%～57.2% for the unfertilized soil,respectively.Therefore,the performance of the TUF technique has a great potential to minimize the difference of N2O fluxes calculated with different techniques and reduce the uncertainty associated with N2O fluxes,and such technique should be incorporated into the protocols of N2O quantification in the future. |
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| Keywords: | static chamber technique winter wheat flux N2O |
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