| 农牧交错带草地生态系统N2O通量对短期氮、磷添加的响应 |
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| 引用本文： | 燕学东,陈晓鹏,郝杰,刁华杰,李红玉,董宽虎,王常慧.农牧交错带草地生态系统N2O通量对短期氮、磷添加的响应[J].草地学报,2022,30(12):3199-3206. |
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| 作者姓名： | 燕学东 陈晓鹏 郝杰 刁华杰 李红玉 董宽虎 王常慧 |
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| 作者单位： | 1. 山西农业大学草业学院, 山西 太谷 030801;2. 草地生态保护与乡土草种质创新山西省重点实验室, 山西 太谷 030801;3. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西 右玉 037200;4. 山西农业大学科研管理部, 山西 太谷 030801 |
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| 基金项目： | 山西农业大学高层次引进人才项目资助(2021XG008),国家重点研发计划(2017YFA0604802)和山西省重点实验室项目(202104010910017)资助 |
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| 摘 要： | 氮(N)、磷(P)是维持陆地生态系统生产力的重要营养元素，为探求磷添加和氮、磷的交互作用如何影响农牧交错带草地生态系统N2O通量及调控机制，本研究设置对照(CK)、氮添加(N：缓释尿素10g·m-2·a-1)、磷添加(P：磷酸二氢钙10g·m-2·a-1)以及氮、磷同时添加(NP)4个处理，通过静态暗箱-气相色谱法测定2018和2019年生长季N2O通量，通过结构方程模型等寻求氮、磷及其互作效应对N2O通量的影响。结果表明：氮添加显著降低了2018年生长季N2O排放，而磷添加显著降低了两年生长季N2O排放；氮、磷同时添加削弱了单独氮或磷添加对N2O排放的抑制作用；硝态氮、铵态氮和土壤含水量是N2O通量的主要影响因素。因此，氮、磷添加对农牧交错带草地N2O通量的影响存在显著的交互作用，并且受年际间温度和降水的调控，农牧交错带草地养分管理对N2O通量的影响应考虑降水格局的变化。
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| 关 键 词： | 养分添加 农牧交错带 N2O排放 温室气体 |
| 收稿时间： | 2022-06-05 |
Responses of N2O flux to short-term nitrogen and phosphorus addition in grassland ecosystem of agro-pastoral ecotone |
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| YAN Xue-dong,CHEN Xiao-peng,HAO Jie,DIAO Hua-jie,LI Hongyu,DONG Kuan-hu,WANG Chang-hui.Responses of N2O flux to short-term nitrogen and phosphorus addition in grassland ecosystem of agro-pastoral ecotone[J].Acta Agrestia Sinica,2022,30(12):3199-3206. |
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| Authors: | YAN Xue-dong CHEN Xiao-peng HAO Jie DIAO Hua-jie LI Hongyu DONG Kuan-hu WANG Chang-hui |
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| Institution: | 1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi 030801, China;2. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi 030801, China;3. Youyu Loess Plateau Grassland Ecosystem Research Station, Youyu, Shanxi 037200, China;4. Office of Research Administration, Shanxi Agricultural University, Taigu, Shanxi 030801, China |
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| Abstract: | Nitrogen (N) and phosphorus (P) are two important nutrients for maintaining the productivity of terrestrial ecosystems. To investigate how P addition and the interaction of N and P affect N2O flux and regulatory mechanisms of grassland ecosystems in agro-pastoral ecotone,four treatments (CK:control,N:nitrogen addition (N:urea 10 g·m-2·a-1),P:phosphorus addition (calcium dihydrogen phosphate 10 g·m-2·a-1),NP:(simultaneous addition of nitrogen and phosphorus) were set up in this study. The N2O flux were measured by static dark box-gas chromatography in the growing seasons of 2018 and 2019,and the effects of N,P,and their interaction on N2O fluxes were investigated by structural equation model (SEM). The results showed that N addition significantly reduced the N2O emission in the 2018 growing season,while P addition significantly reduced the N2O emission in both 2018 and 2019 growing seasons,and the simultaneous addition of N and P weakened the inhibitory effect of single nitrogen or phosphorus addition on N2O emission;NO-3-N,NH+4-N and soil moisture content were the main factors that affected N2O flux. In total,there was a significant interaction between N and P addition on N2O flux of grassland in the agro-pastoral ecotone,and it was regulated by interannual temperature and precipitation. The change of precipitation patterns should be considered in the study of the effect of nutrient management on N2O flux in the agro-pastoral ecotone. |
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| Keywords: | Nutrient addition Agro-pastoral ecotone N2O emission Greenhouse gases |
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