Effects of nitrogen addition on ecosystem-level carbon fluxes and water use efficiency are more dependent on early growing season precipitation than on annual precipitation in a semi-arid meadow steppe
Effects of nitrogen addition on ecosystem-level carbon fluxes and water use efficiency are more dependent on early growing season precipitation than on annual precipitation in a semi-arid meadow steppe
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在半干旱草甸草原中，氮添加对生态系统水平碳通量和水分利用效率的影响更多地取决于生长季早期降水量，而不是年降水量
DOI：
10.1016/j.agrformet.2023.109316
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发表时间：
2023-03
影响因子：
6.2
通讯作者：
Wei Sun
中科院分区：
文献类型：
--
作者：
Wenzheng Song;Raúl Ochoa-Hueso;Haiying Cui;Xuechen Yang;Mingcai Fan;Wei Sun
降水和人为氮（N）对生态系统碳（C）通量和植物水分利用效率（WUE）具有深远的影响，特别是在受N和水资源限制的半干旱盐碱化草地。为了更好地了解氮素和降水对C通量和植物WUE的影响机制，于2015年在以羊草（Leymus chinensis（Trin.）Tzvel.）中国东北。在2016-2019年期间，我们研究了氮的添加如何结合不同的年度和早期生长季节降水量来调节生态系统的碳通量。（NEE，生态系统CO2净交换; ER，生态系统呼吸; GEP，生态系统生产总值），植物WUE，包括从13 C组成推断的叶尺度长期内在WUE（iWUE）和生态系统尺度WUE（WG，WG= GEP/ET），以及相关的生物和土壤变量。我们发现：（i）N供应减少NEE和增加ER，GEP，WG在一个非线性模式;（ii）N添加增加iWUE，从而WG;和（iii）较高的早期生长季节降水，与年降水量相比，放大了N对NEE，ER，GEP，WG的影响，这表明N对NEE，ER，GEP，WG的影响更多地依赖于早期生长季节降水比年降水量。本研究提高了我们对未来全球C，N和全球气候变化形成的水动力学耦合机制的理解。
Precipitation and anthropogenic nitrogen (N) may have profound impacts on ecosystem carbon (C) fluxes and the plant water use efficiency (WUE), particularly in semi-arid salinized and alkalized grasslands that were limited by both N and water availability. To better understand the mechanism of N and precipitation effects on C fluxes and plant WUE, in 2015, we established a randomized block-design N addition experiment, including five N levels (0, 5, 10, 20, 40 g N m−2yr−1) in a meadow steppe (dominated byLeymus chinensis(Trin.) Tzvel.) of northeast China. Between 2016–2019, we investigated how N addition, combined with different amounts of annual and early growing season precipitation availability, modulated ecosystem C fluxes (NEE, net ecosystem CO2exchange; ER, ecosystem respiration; GEP, gross ecosystem production), plant WUE, including leaf-scale long-term intrinsic WUE (iWUE) inferred from13C composition and ecosystem-scale WUE (WG, WG= GEP/ET), as well as related biotic and edaphic variables. We found that: (i) N supply decreased NEE and increased ER, GEP, and WGin a nonlinear pattern; (ii) N addition increased iWUE and thus WG; and (iii) higher early growing season precipitation, in contrast to annual precipitation, magnified the effect of N on NEE, ER, GEP, and WG, suggesting that N effects on NEE, ER, GEP, and WGdepend more on early growing season precipitation than annual precipitation. The present study improves our understanding of the coupled mechanisms of future global C, N, and water dynamics shaped by global climate change.
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内蒙古草原生态系统碳通量和水分利用效率对氮添加的非线性响应
影响因子：
5.2
作者：
Tian Dashuan;Niu Shuli;Pan Qingmin;Ren Tingting;Chen Shiping;Bai Yongfei;Han Xingguo
通讯作者：
Han Xingguo
影响因子：
3.7
作者：
Wang Y;Jiang Q;Yang Z;Sun W;Wang D
通讯作者：
Wang D
影响因子：
4.8
作者：
Liting Liu;Chunsheng Hu;J. Olesen;Z. Ju;Xiying Zhang
通讯作者：
Liting Liu;Chunsheng Hu;J. Olesen;Z. Ju;Xiying Zhang
植物氮吸收驱动生产力对草原氮和水添加的响应
影响因子：
4.6
作者：
Lü XT;Dijkstra FA;Kong DL;Wang ZW;Han XG
通讯作者：
Han XG
影响因子：
64.8
作者：
Green, Julia K.;Seneviratne, Sonia I.;Gentine, Pierre
通讯作者：
Gentine, Pierre