首页|Effects and mechanism of freeze-thawing cycles on the soil N2O fluxes in the temperate semi-arid steppe
Effects and mechanism of freeze-thawing cycles on the soil N2O fluxes in the temperate semi-arid steppe
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High nitrous oxide (N2O) emissions during freeze-thawing period (FTP) have been observed in many different ecosystems.However,the knowledge about the dynamic of soil N2O emissions and its main driving mechanism during the freeze-thawing processes in grassland ecosystem is still limited.An in-situ experiment was conducted during the FTP on the sites with 0 and 15％ surplus of the average rainfall and two levels of N addition (0,10 g N/(m2·year)) during growing season (marked as W0N0,W15N0,W0N10,W15N10,respectively) to explore the effects of water and N background on soil N2O emissions during FTPs and the relationship between soil N2O emissions and environmental factors.The results indicated that water and N treatments conducted during growing season did not show significant effect on the N2O effiuxes of FTP,but the soil mineral N contents of W0N10 treatment were significantly higher than those of W0N0,W15N0,W15N10 treatments (p ＜ 0.05).The soil PLFA concentrations of microbial groups monitored during 2015 spring freeze-thawing period (2015S-FTP) were lower than those during winter freeze-thawing period of 2014 (2014W-FTP),while cumulative soil N2O emissions of 2015S-FTP were higher than those of 2014W-FTP.The correlations between soil N2O effluxes and most of the measured environmental factors were insignificant,multiple stepwise regression analysis indicated that the soil temperature,soil NH4+-N content and air temperature were the major environmental factors which significantly influenced the N2O effluxes during 2014W-FTP,and air temperature and soil water content were the significant influencing factors during 2015S-FTP.
Temperate semi-arid steppeNitrous oxideFreeze-thawing periodWater and nitrogen addition
Liqin Wang、Yuchun Qi、Yunshe Dong、Qin Peng、Shufang Guo、Yunlong He、Zhaolin Li
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Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
University of the Chinese Academy of Sciences, Beijing 100049, China
This work was supported by the National Natural Science Foundation of China
NETL
NSTL
万方数据
维普
