模拟增温和氮素添加对荒漠草原生态系统碳交换的影响

发布时间：2018-04-21 11:11

  本文选题：增温 + 氮素添加　； 参考：《生态学杂志》2016年06期

【摘要】：气候变暖和大气氮沉降是全球变化的重要驱动因子。在草地生态系统中,气温升高和大气氮沉降都会改变草地固碳(C)状况,然而温度增加和大气氮沉降是如何影响生态系统碳交换目前还不明确。本研究旨在研究增温和氮素添加对荒漠草原碳交换的影响。在短花针茅荒漠草原上采用2×2因素完全随机区组的裂区设计,使用红外辐射器来模拟气候变暖并且使用添加氮肥的方法来模拟大气氮沉降,在不同处理条件下测定生态系统净碳交换(NEE)、生态系统呼吸(ER)和总生态系统生产力(GEP),分析了2013和2014年影响短花针茅荒漠草原生态系统C交换的因素,结果如下:(1)增温使土壤温度显著增加了0.70℃(P0.001),土壤湿度显著增加了7.58%(P0.001)。(2)增温、氮素添加及其交互作用显著增加了GEP和ER(P0.05),而对于NEE没有显著影响(P0.05)。(3)2013年GEP在8月初达到峰值,ER在8月末9月初达到峰值,NEE随着GEP和ER的变化而波动;2014年GEP、ER和NEE均在8月末9月初达到峰值。(4)ER和GEP随着大气温度升高和降水增加而增大,土壤温度和土壤湿度也是影响生态系统C交换的重要因素。
[Abstract]:Climate warming and atmospheric nitrogen deposition are important drivers of global change. In grassland ecosystem, the increase of temperature and the deposition of atmospheric nitrogen will change the carbon sequestration of grassland. However, it is not clear how the increase of temperature and atmospheric nitrogen deposition affect the carbon exchange of ecosystem. The purpose of this study was to study the effects of warming and nitrogen addition on carbon exchange in desert steppe. In the desert steppe of Stipa breviflora, the split zone design of 2 脳 2 factor complete random block was adopted. The infrared radiator was used to simulate global warming and nitrogen fertilizer was added to simulate atmospheric nitrogen deposition. Net carbon exchange (NEEN), ecosystem respiration (ERE) and total ecosystem productivity (GEP) were measured under different treatment conditions. The factors affecting ecosystem C exchange in Stipa breviflora desert steppe in 2013 and 2014 were analyzed. The results were as follows: (1) the temperature of the soil increased significantly by 0.70 鈩，

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