CAJ | 학술논문

本研究以内蒙古呼伦贝尔草甸草原为研究对象,通过室内模拟实验与野外观测实验相结合,分析不同土层、放牧与封育、长期与短期冻融、不同冻融频率与冻融温差强度对草地土壤N2O产生与排放的影响.结果表明：冻融期间,从地表到下层15cm土壤N2O的产生速率随深度的增加而逐渐减少,N2O的产生主要来源于0~9cm的表层土壤；冻融期间温差相同的情况下,冻融次数越多,N2O的产生速率越小；N2O的产生速率随着温差的变小而减少；冻融期间封育样地的N2O排放量大于放牧样地,且封育样地的N2O排放量占全年排放总量的25.09%,大于放牧样地(12.38%),但从观测年排放总量看,放牧却促进了草地N2O源的功能；草地春融期间的N2O排放量是整个冻融期N2O排放量的最大贡献者.
본연구이내몽고호륜패이초전초원위연구대상,통과실내모의실험여야외관측실험상결합,분석불동토층、방목여봉육、장기여단기동융、불동동융빈솔여동융온차강도대초지토양N2O산생여배방적영향.결과표명：동융기간,종지표도하층15cm토양N2O적산생속솔수심도적증가이축점감소,N2O적산생주요래원우0~9cm적표층토양；동융기간온차상동적정황하,동융차수월다,N2O적산생속솔월소；N2O적산생속솔수착온차적변소이감소；동융기간봉육양지적N2O배방량대우방목양지,차봉육양지적N2O배방량점전년배방총량적25.09%,대우방목양지(12.38%),단종관측년배방총량간,방목각촉진료초지N2O원적공능；초지춘융기간적N2O배방량시정개동융기N2O배방량적최대공헌자.
In this paper we combined the laboratory simulation tests with field experiments of greenhouse gas fluxes, and analyzed the effects of different soil layers, grazing and fencing, long-term and short-term freezing-thawing, different frequency and intensity of freezing-thawing on soil N2O production rate and emission flux in Hulunbuir meadow grassland in Inner Mongolia. During freezing and thawing, the N2O productions mainly came from topsoil of 0to 9cm depth, and gradually reduced from the surface down to depth of 15cm soil. The N2O emissions decreased with lowing temperature differences. Under the situation of the same temperature differences, the N2O emissions decreased with increasing freezing-thawing frequencies. During the freezing-thawing cycle, N2O fluxes of fenced plot were greater than that of grazing plot, contributing to 25.09%of annual N2O emissions, while the contribution is about 12.38%for grazing plot. However from the annual time scale, the grazing increased the annual total N2O emissions. Early spring thawing was the largest contributors to the N2O emission during the whole period of freezing-thawing cycles.