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Effects of Simulated NH_4^+ Deposition on CO_2 Fluxes in the Hulun Buir Meadow Steppe of Inner Mongolia,China
铵态氮沉降对内蒙古呼伦贝尔草地CO_2通量的影响（英文）作者机构：中国农业科学院农业环境与可持续发展研究所农业部农业环境重点实验室农业清洁流域创新团队北京100081 中国科学院地理科学与资源研究所生态系统网络观测与模拟院重点实验室北京100101 山东农业大学林学院泰安271018 中国农业科学院农业资源与农业区划研究所农业部农业信息重点实验室北京100081
出 版 物：《Journal of Resources and Ecology》 (资源与生态学报（英文版）)
年 卷 期：2015年第6卷第3期
页 面：129-138页
核心收录：
基 金：the National Natural Science Foundation of China(Grant No.31130009,31300375) the National Key Project of Scientific and Technical Supporting Program(Grant No.2013BAC03B03)
主 题：C02 fluxes N deposition N addition Inner Mongolia
摘 要：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 fluxes to simulated N deposition was studied in the growing season of 2008 and 2009 by static chamber and gas chromatograph techniques. Parallel to the flux 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 significant effect on NH4＋, but slightly increased NO3- in the later period. The HN treatment tended to increase CO2 fluxes in the two years, and LN treatment tended to decrease CO2 fluxes in 2008, and shifted to increase CO2 fluxes in later growing season of 2009. N addition significantly in- creased the aboveground biomass and root biomass. The correlation between CO2 fluxes and moisture or tempera- ture factors did not significantly change due to N addition, but N addition enhanced the moisture sensitivity of CO2 fluxes as well as the temperature sensitivity of CO2 fluxes. These results suggest that the increasing ammonium N deposition would be likely to stimulate CO2 fluxes in the meadow steppe of Inner Mongolia, China.
