CAJ | 학술논문

大气氮沉降可能会影响陆地生态系统的碳通量。本文主要目的是探讨在氮素缺乏的草地生态系统中，氮素添加是否会增加CO2通量。本研究于2008和2009生长季进行，采用静态箱-气相色谱法研究CO2通量对氮沉降增加的响应。结果表明，2年的氮素添加并没有显著影响土壤NH4+含量，NO3-含量只是在2009年生长季后期有所增加。高氮处理增加了CO2通量，而低氮处理在2008年抑制了CO2通量，2009年后期增加了CO2通量。而且氮素添加显著增加了地上生物量和根系的生物量。CO2通量与土壤水分、土壤温度的关系并没有因为氮素的添加而改变，但是氮素添加增加了CO2通量对土壤水分和土壤温度的敏感性。这些结果表明，在未来大气氮沉降增加的背景下，呼伦贝尔草甸草原CO2通量有可能会增加。
대기담침강가능회영향륙지생태계통적탄통량。본문주요목적시탐토재담소결핍적초지생태계통중，담소첨가시부회증가CO2통량。본연구우2008화2009생장계진행，채용정태상-기상색보법연구CO2통량대담침강증가적향응。결과표명，2년적담소첨가병몰유현저영향토양NH4+함량，NO3-함량지시재2009년생장계후기유소증가。고담처리증가료CO2통량，이저담처리재2008년억제료CO2통량，2009년후기증가료CO2통량。이차담소첨가현저증가료지상생물량화근계적생물량。CO2통량여토양수분、토양온도적관계병몰유인위담소적첨가이개변，단시담소첨가증가료CO2통량대토양수분화토양온도적민감성。저사결과표명，재미래대기담침강증가적배경하，호륜패이초전초원CO2통량유가능회증가。
Atmospheric nitrogen (N) deposition may affect carbon (C) sequestration in terrestrial ecosystem. The main objective of this paper was to test the hypothesis that N addition would increase CO2 emission in the N limited meadow steppe in Inner Mongolia, China. Response of CO2 lfuxes to simulated N deposition was studied in the growing season of 2008 and 2009 by static chamber and gas chromatograph techniques. Paralel to the lfux mea-surements, soil temperature, soil moisture, TOC, DOC, soil NH4+ and NO3- were measured at the same time. The results indicated that two-year N additions had no signiifcant effect on NH4+, but slightly increased NO3- in the later period. The HN treatment tended to increase CO2 lfuxes in the two years, and LN treatment tended to decrease CO2 lfuxes in 2008, and shifted to increase CO2 lfuxes in later growing season of 2009. N addition signiifcantly in-creased the aboveground biomass and root biomass. The correlation between CO2 lfuxes and moisture or tempera-ture factors did not signiifcantly change due to N addition, but N addition enhanced the moisture sensitivity of CO2 lfuxes as wel as the temperature sensitivity of CO2 lfuxes. These results suggest that the increasing ammonium N deposition would be likely to stimulate CO2 lfuxes in the meadow steppe of Inner Mongolia, China.