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Nitrous oxide emissions following seasonal freeze-thaw events from arable soils in Northeast China

文献类型： 外文期刊

作者： Chen Zhe 1 ; Yang Shi-qi 1 ; Zhang Ai-ping 1 ; Jing Xin 3 ; Song Wei-min 4 ; Mi Zhao-rong 5 ; Zhang Qing-wen 1 ; Wang Wen 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Minist Agr, Key Lab Agroenvironm, Beijing 100081, Peoples R China

2.Qinghai Normal Univ, Sch Life Sci, Xining 810008, Qinghai, Peoples R China

3.Peking Univ, Coll Urban & Environm Sci, Minist Educ, Key Lab Earth Surface Proc,Dept Ecol, Beijing 100871, Peoples R China

4.Tsinghua Univ, Ctr Earth Syst Sci, Beijing 100084, Peoples R China

5.Chinese Acad Agr Sci, Farmland Irrigat Res Inst, X

关键词： N2O;non-growing season;nitrogen biogeochemical cycling;soil moisture;snow cover;structural equation model

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2018 年 17 卷 1 期

页码：

收录情况： SCI

摘要： Seasonal soil freeze-thaw events may enhance soil nitrogen transformation and thus stimulate nitrous oxide (N2O) emissions in cold regions. However, the mechanisms of soil N2O emission during the freeze-thaw cycling in the field remain unclear. We evaluated N2O emissions and soil biotic and abiotic factors in maize and paddy fields over 20 months in Northeast China, and the structural equation model (SEM) was used to determine which factors affected N2O production during non-growing season. Our results verified that the seasonal freeze-thaw cycles mitigated the available soil nitrogen and carbon limitation during spring thawing period, but simultaneously increased the gaseous N2O-N losses at the annual time scale under field condition. The N2O-N cumulative losses during the non-growing season amounted to 0.71 and 0.55 kg N ha(-1) for the paddy and maize fields, respectively, and contributed to 66 and 18% of the annual total. The highest emission rates (199.2-257.4 mu g m(-2) h(-1)) were observed during soil thawing for both fields, but we did not observe an emission peak during soil freezing in early winter. Although the pulses of N2O emission in spring were short-lived (18 d), it resulted in approximately 80% of the non-growing season N2O-N loss. The N2O burst during the spring thawing was triggered by the combined impact of high soil moisture, flush available nitrogen and carbon, and rapid recovery of microbial biomass. SEM analysis indicated that the soil moisture, available substrates including NH4+ and dissolved organic carbon (DOC), and microbial biomass nitrogen (MBN) explained 32, 36, 16 and 51% of the N2O flux variation, respectively, during the non-growing season. Our results suggested that N2O emission during the spring thawing make a vital contribution of the annual nitrogen budget, and the vast seasonally frozen and snow-covered croplands will have high potential to exert a positive feedback on climate change considering the sensitive response of nitrogen biogeochemical cycling to the freeze-thaw disturbance.

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