Abstract: Methane (CH₄),as an important greenhouse gas,played an important role in the process of global change,small variations of CH₄ may lead to large changes in climate. There were many studies on the nitrogen (N) impact on CH₄ uptake,but fewer studies on the effects of phosphorus and interaction of nitrogen-phosphorus (N-P) on CH₄ uptake in dryland. In this review,we summarized the current status of the N,P effects and their interaction on CH₄ uptake in dryland,and identified out that the effect of N on CH₄ have already gone through three stages:first,uncertainty about the conclusions about that effect (inhibitory,enhancing,and neutral),followed by some primary mechanisms investigation (e.g.,environmental factors:temperature,moisture,pH,Eh,etc.),then the basic conclusion of the “low-promotion and high-inhibition” for N effect on CH₄ oxidation,and the insights into microbial driving mechanism on this phenomenon. It was also found out that the inhibitory effect of N on CH₄ uptake was mainly due to the competition between NH⁺₄ and CH₄. While P effect on CH₄ had been less studied and that effect remains uncertain. The interaction of N and P on CH₄ uptake was even less studied,especially whether the P would induce the change of N effect on CH₄ has not been studied yet. Based on the review of previous studies,the knowledge gaps about the effects of P and interaction of N and P on CH₄ in arid and semi-arid grassland ecosystem were identified,and the latest research progresses in the recent decades were briefly introduced and summarized up. It has been concluded the phosphorus deposit alleviate the N-suppression on CH₄ uptake in semi-arid grassland ecosystems,and that alleviative effect exists on global scales as well. Finally,the possible research directions and hot issues in this field were put forward for coming days.

Key words: N and P deposition, Competition, Microbes, Driving mechanisms

摘要： 甲烷的“源/汇”功能在全球变化过程中作用重要，其微小变化可能引起气候的巨变。关于氮对甲烷吸收影响的研究较多，而磷及氮磷交互对甲烷吸收的影响研究较少。本文综述氮、磷对旱地甲烷吸收影响的现状进展，发现氮对甲烷的影响大致经历三个阶段：最初是关于结论的不确定性(抑制、促进、中性)，其次是一些初级的宏观生态学影响机制的探讨(如环境因素温度、水分、pH值等)，之后便是基本定论的“低促高抑”的抑制竞争作用、以及这种现象发生的微生物学驱动机制探讨。而磷的作用是否会改变氮对甲烷影响的作用，还没有研究。在综述前人研究的基础上，得出该方向干旱半干旱草地生态系统的研究缺口(Knowledge gap)，并总结作者过去十几年在半干旱草地的最新研究进展：磷添加减缓半干旱草地生态系统氮对甲烷吸收的抑制作用。文中最后提出该领域未来可能的研究热点。

关键词: 氮磷沉降, 竞争作用, 微生物, 驱动机制