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不同氮素形态对湿地小叶章氮吸收和N2O排放的影响
引用本文:付晓玲,倪红伟,刘赢男,王建波,王继丰. 不同氮素形态对湿地小叶章氮吸收和N2O排放的影响[J]. 中国农学通报, 2022, 38(11): 15-21. DOI: 10.11924/j.issn.1000-6850.casb2021-1224
作者姓名:付晓玲  倪红伟  刘赢男  王建波  王继丰
作者单位:1.黑龙江省科学院自然与生态研究所,哈尔滨150040;2.黑龙江省林业科学院,哈尔滨150081
基金项目:国家自然科学基金项目“基于15N示踪技术的三江平原小叶章湿地N2O排放对氮素形态的短期响应”(31700424);
摘    要:氮素生物地球化学循环和减缓温室气体排放已成为全球(气候)变化研究的热点问题,氮素有效性是调控全球变化反馈机制的重要因子。本研究以东北三江平原小叶章湿地为研究对象,采用15N示踪技术,通过野外原位控制实验,研究湿地植物小叶章对不同氮素形态(NH+4、NO-3、NH+4-NO-3)的吸收及小叶章N2O排放通量特征。结果表明:(1)不同氮素形态处理下,小叶章叶生物量表现为处理A>NA>N>CK;A处理,茎生物量最大,比对照提高了35.7%;NA处理,地下生物量显著高于A和CK(P<0.05);NA处理,根冠比最大,是对照的1.82倍。(2)不同氮素形态处理下,小叶章叶、茎、地上以及根氮含量显著高于对照(CK)(P<0.05),不同处理之间氮含量差异不显著(P<0.05)。(3)不同氮素形态处理下,小叶章叶、茎以及地上部分Ndff和15N含量均表现为处理A>N>NA>CK,并且各处理极显著高于对照(P<0.01),各处理之间达到显著差异(P<0.05)。(4)不同氮素形态处理下,处理N湿地N2O排放量最多,且显著高于处理A和处理NA(P<0.05),处理N、A、NA显著高于对照(CK)(P<0.05)。阐释了不同形态氮素在植物-土壤-大气系统中周转与分配策略,以及对N2O排放的影响,为湿地氮生物地球化学和温室气体排放研究提供基础数据。

关 键 词:三江平原  湿地  氮素形态  示踪技术  
收稿时间:2021-12-31

Effects of Different Nitrogen Forms on Nitrogen Uptake and N2O Emission of Calamagrostis angustifolia in Wetland
FU Xiaoling,NI Hongwei,LIU Yingnan,WANG Jianbo,WANG Jifeng. Effects of Different Nitrogen Forms on Nitrogen Uptake and N2O Emission of Calamagrostis angustifolia in Wetland[J]. Chinese Agricultural Science Bulletin, 2022, 38(11): 15-21. DOI: 10.11924/j.issn.1000-6850.casb2021-1224
Authors:FU Xiaoling  NI Hongwei  LIU Yingnan  WANG Jianbo  WANG Jifeng
Affiliation:1.Institute of Natural Resources and Ecology, Heilongjiang Academy of Sciences, Harbin 150040;2.Heilongjiang Academy of Forestry, Harbin 150081
Abstract:Nitrogen biogeochemical cycles and mitigation of greenhouse gas emission have become a hot topic in global climate change research. Nitrogen availability is an important factor in the feedback mechanism of global climate change regulation. This research used a small Calamagrostis angustifolia wetland in the Sanjiang Plain of northeast China as the research object and adopted 15N tracer technique to study the uptake of different nitrogen forms (NH4+, NO3-, NH+4-NO-3) by C. angustifolia and its N2O emission flux through field in situ control experiments. The results showed as follows. (1) Under different nitrogen forms, the biomass of C. angustifolia leaf showed: A>NA>N>CK; the stem biomass of treatment A was the largest, which was 35.7% higher than that of CK; the underground biomass of treatment NA was significantly higher than that of treatment A and CK (P<0.05); the root-shoot ratio of treatment NA was the largest, which was 1.82 times that of CK. (2) Under different nitrogen forms, the nitrogen contents in leaf, stem, aboveground part and root were significantly higher than those of CK (P<0.05), but there was no significant difference in nitrogen contents among different treatments (P<0.05). (3) Under different nitrogen forms, the contents of Ndff and 15N in leaf, stem and aboveground part showed: A>N>NA>CK, and each treatment had significantly higher content than that of CK (P<0.01), and there was a significant difference among all the treatments (P<0.05). (4) Under different nitrogen forms, the N2O emission was the highest in treatment N, significantly higher than that of treatment A and NA (P<0.05), and the N2O emission of treatment N, A and NA were significantly higher than that of CK (P<0.05). This study discussed the cycling and distribution strategies of different nitrogen forms in the plant-soil-atmosphere system, as well as their effects on N2O emission, it will provide basic data for the research on wetland nitrogen biogeochemistry and greenhouse gas emission.
Keywords:Sanjiang Plain  wetland  nitrogen forms  tracer technique  
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