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Chinese Journal of Ecology
2016,35
(10)
2692-2698
五角槭根系的负激发效应降低了异养呼吸及其温度敏感性
作 者：
曲桂芳;徐文华;王会;彭勃;高德才;孙建飞;郑俊强;姜萍;白娥
单 位：
中国科学院沈阳应用生态研究所
关键词：
13C自然丰度;根际激发效应;土壤胞外酶活性;土壤呼吸;土壤有机碳分解;自养呼吸
摘 要：
土壤呼吸(Rs)由自养呼吸(Ra)和异养呼吸(Rh)组成,这两个组分温度敏感性的差异性存在较大争议,而根际激发效应对R_h呼吸速率及其温度敏感性(Q10)的影响导致这一问题更为复杂化。本研究采用~(13)C自然丰度法,将中国北方温带次生林的重要建群树种C_3植物五角槭种植于曾经连续23年种植玉米的C_4土壤中,以此区分R-a和R_h,并探讨R_a和R_h温度敏感性的差异性以及根际激发效应对R_h呼吸速率和Q_(10)的影响。结果表明:植物根系对R_h呼吸速率有负激发效应,并降低了R_h的温度敏感性;植树土壤的R_h比不植树土壤的无根异养呼吸(Rhf)降低了34.3%,R_h的Q_(10)值(1.51)也显著低于R_(hf)的Q_(10)值(2.07),而Ra的Q_(10)值(3.89)是R_h的Q_(10)值的2.5倍;因此,未来研究在区分R_a和R_h呼吸速率和温度敏感性时,应该考虑根际激发效应对R_h及其温度敏感性的影响,这对于精确评估和模型模拟气候变化背景下R_s的变化和响应具有重要意义。
译 名：
Negative priming effect of maple roots reduced heterotrophic respiration and its temperature sensitivity
作 者：
QU Gui-fang;XU Wen-hua;WANG Hui;PENG Bo;GAO De-cai;SUN Jian-fei;ZHENG Jun-qiang;JIANG Ping;BAI Edith;Institute of Applied Ecology,Chinese Academy of Sciences;University of Chinese Academy of Sciences;
关键词：
13C natural abundance;;rhizosphere priming effect;;soil extracellular enzyme activity;;soil respiration;;soil organic matter decomposition;;autotrophic respiration
摘 要：
Soil respiration( R_s) comprises autotrophic( R_a) and heterotrophic( R_h) respiration.The difference in temperature sensitivity( Q_(10)) between R_a and Rhis still under debate. Rhizosphere priming effect( RPE) plays an important role in affecting the temperature sensitivity of R_h,which makes the issue more complex. Here we used the ~(13)C natural abundance method by planting Acer mono( C_3 plant) in microcosms with maize soil( soil with cultivation of C_4 maize for23 years) to investigate the responses of R_a and Rhto temperature change and the role of RPE.An overall negative RPE was observed in the growing season,which reduced R_h and its Q_(10) value by 34.3% and 27.0%,respectively. The Q_(10) value of Ra( 3.89) was 2.5 times higher than that of R_h( 1.51). Our results highlight the importance of plant roots in regulating the response of Rsto temperature,which should be considered in models of soil respiration in the future.
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