本文選題：增溫 + 氮素添加�。� 參考：《生態(tài)學雜志》2016年06期

【摘要】：氣候變暖和大氣氮沉降是全球變化的重要驅(qū)動因子。在草地生態(tài)系統(tǒng)中,氣溫升高和大氣氮沉降都會改變草地固碳(C)狀況,然而溫度增加和大氣氮沉降是如何影響生態(tài)系統(tǒng)碳交換目前還不明確。本研究旨在研究增溫和氮素添加對荒漠草原碳交換的影響。在短花針茅荒漠草原上采用2×2因素完全隨機區(qū)組的裂區(qū)設(shè)計,使用紅外輻射器來模擬氣候變暖并且使用添加氮肥的方法來模擬大氣氮沉降,在不同處理條件下測定生態(tài)系統(tǒng)凈碳交換(NEE)、生態(tài)系統(tǒng)呼吸(ER)和總生態(tài)系統(tǒng)生產(chǎn)力(GEP),分析了2013和2014年影響短花針茅荒漠草原生態(tài)系統(tǒng)C交換的因素,結(jié)果如下:(1)增溫使土壤溫度顯著增加了0.70℃(P0.001),土壤濕度顯著增加了7.58%(P0.001)。(2)增溫、氮素添加及其交互作用顯著增加了GEP和ER(P0.05),而對于NEE沒有顯著影響(P0.05)。(3)2013年GEP在8月初達到峰值,ER在8月末9月初達到峰值,NEE隨著GEP和ER的變化而波動;2014年GEP、ER和NEE均在8月末9月初達到峰值。(4)ER和GEP隨著大氣溫度升高和降水增加而增大,土壤溫度和土壤濕度也是影響生態(tài)系統(tǒng)C交換的重要因素。
[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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