资源与生态学报

资源与生态学报 ›› 2012, Vol. 3 ›› Issue (1): 16-19.DOI: 10.5814/j.issn.1674-764x.2012.01.003

• 论文 • 上一篇    下一篇

土壤中氮碳间相互作用对全球碳循环的影响

Siegfried FLEISCHER   

  1. 瑞典哈尔姆斯塔德大学 Rydberg实验室, 瑞典, 哈尔姆斯塔德 823信箱
  • 收稿日期:2011-11-25 修回日期:2011-11-30 出版日期:2012-03-30 发布日期:2012-03-30
  • 通讯作者: Siegfried FLEISCHER. Email: Siegfried.Fleischer@hh.se

Interaction between N and C in Soil Has Consequences for Global Carbon Cycling

Siegfried FLEISCHER   

  1. Rydberg Laboratory, Halmstad University, P.O. Box 823, S-301. 18 Halmstad, Sweden
  • Received:2011-11-25 Revised:2011-11-30 Online:2012-03-30 Published:2012-03-30

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被引次数

7

摘要： 氮循环中的能量产生过程构成与全球碳循环间的重要关联。例如,氮投入土壤,一开始导致CO2排放降低。这一众所周知的效应被理解为土壤呼吸作用受到阻碍或延缓。然而,当把冗余考虑在内便知,氮投入并不使最初得到的CO2最低排放量保持不变,而是逐渐导致排放增加。土壤中硝化作用对CO2消耗过程的特异性抑制,加上铵冗余投入或乙炔作用,往往导致额外的CO2排放量。这种总自养性呼吸(GHR)与CO2净排放(NHR)之间的差就是土壤内CO2汇。土壤呼吸作用单纯由NHR产生的CO2排放量(通常情况)来决定会导致对土壤系统的曲解,特别是在氮沉降量高的地区。因此,必须重新考虑温暖区域土壤呼吸作用的“适应环境”问题。可能也需要质疑氮投入带来的“呼吸抑制”概念。无视这些过程,包括上述氮驱动下的土壤内CO2汇过程,也许会有碍于采取足够的措施来对抗气候变化。

关键词: 土壤呼吸, 碳汇, CO2排放, 温度反应, 气候变化, 氮投入

Abstract: Energy-yielding processes in the N-cycle form important links with the global C-cycle. One example is demonstrated with the supply of nitrogen to soils, initially resulting in lowered CO2 emissions. This well known effect has mostly been interpreted as hampered or delayed soil respiration. When added in surplus, however, nitrogen supply does not stabilize the minimum emissions initially obtained, but gradually results in increased CO2 emissions. Specific inhibition of the CO2 consuming process nitrification in soils, with surplus ammonium supply or with acetylene, mostly results in additional CO2 emissions. The difference between this disclosed gross heterotrophic respiration (GHR) and the net CO2 emission (NHR) is the result of a within-soil CO2-sink. Soil respiration solely determined as CO2 emitted as NHR (the common situation) therefore may lead to misinterpretations of the function of the soil system, especially in areas with high N-deposition. As a consequence, the interpreted’acclimation’ of the soil respiration response in a warmer world should be reconsidered. The concept of respiration inhibition by nitrogen supply may also be questioned. Disregard of these processes, including the indicated N-driven within-soil CO2-sink, may prevent adequate measures counteracting climate change.

Key words: soil respiration, carbon sink, CO2 emissions, temperature response, climate change, N-supply