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首页> 外文期刊>The Rangeland Journal >Ecological responses of Stipa steppe in Inner Mongolia to experimentally increased temperature and precipitation. 4: Carbon exchange
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Ecological responses of Stipa steppe in Inner Mongolia to experimentally increased temperature and precipitation. 4: Carbon exchange

机译：内蒙古斯普加斯潘本的生态反应，以实验增加温度和沉淀。 4：碳交换

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摘要

Aspects of carbon exchange were investigated in typical steppe east of Xilinhot city in Inner Mongolia. Four treatments with four replicates were imposed in a randomised block design: Control (C), warming (I), increased precipitation (P) and combined warming and increased precipitation (TP). Increased precipitation significantly increased both ecosystem respiration (ER) and soil respiration (SR) rates. Warming significantly reduced the ER rate but not the SR rate. The combination of increased precipitation and warming produced an intermediate response. The sensitivity of ER and SR to soil temperature and air temperature was assessed by calculating Q10 values: the increase in respiration for a 10 degrees C increase in temperature. Q10 was lowest under T and TP, and highest under P. Both ER and SR all had significantly positive correlation with soil moisture. Increased precipitation increased net ecosystem exchange and gross ecosystem productivity, whereas warming reduced them. The combination of warming and increased precipitation had an intermediate effect. Both net ecosystem exchange and gross ecosystem productivity were positively related to soil moisture and negatively related to soil and air temperature. These findings suggest that predicted climate change in this region, involving both increased precipitation and warmer temperatures, will increase the net ecosystem exchange in the Stipa steppe meaning that the ecosystem will fix more carbon.
机译：在内蒙古Xilinhot City东部的典型草原上研究了碳交换的各个方面。在随机嵌段设计中施加四种重复的四种处理：对照（​​C），升温（I），增加沉淀（P）和组合加热和沉淀（TP）。沉淀的增加显着增加了生态系统呼吸（ER）和土壤呼吸（SR）率。变暖显着降低了ER率但不是SR率。增加的降水和变暖的组合产生了中间反应。通过计算Q10值评估ER和Sr对土壤温度和空气温度的敏感性：呼吸升高10℃的温度增加。 Q10在T和TP下最低，并且在P.ER和Sr下的最高均与土壤湿度显着正相关。提高降水量增加净生态系统交易所和生态系统生产力，而升温减少。升温和沉淀的组合具有中间作用。净生态系统交易所和生态系统总生产率均与土壤水分呈正相关，与土壤和空气温度负相关。这些调查结果表明，预测该地区的气候变化，涉及增加降水和温暖的温度，将增加STIPA草原中的净生态系统交换，这意味着生态系统将修复更多碳。

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