氮素添加对贝加尔针茅草原温室气体通量的影响.pdf

2017,36(8):1640-1648
农业环境科学学报
2017年8月
Journal of Agro-environment Science
张金玲,李洁,越建宁,等.氮素添加对贝加尔针茅草原温室气体通量的影响农业环境科学学报,2017,36(8):1640-1(648
ZHANG Jin-ling, LI Jie, ZHAO Jian-ning, et al. Effeets of nitrogen addition on greenhouse gas Flux in a Stipa baicalensis rassland in Inner Mongolia J]. our
nal of Agro-hiniirnment Science, 2017. 36(8): 1640-1648
氮素添加对贝加尔针茅草原温室气体通量的影响
张金玲1,2,李洁,赵建宁,刘红梅,王宇3,杨殿林
农业部环境保护科研监测所,天津300191;2.沈阳农业大学园艺学院,沈阳110866:3.内蒙古呼伦贝尔市草原监督管理局,呼
伦贝尔021008)
摘要:为了研究氮沉降对内蒙古贝加尔针茅草原主要温室气体CO2、CH4和N2O通量的影响,试验通过施加NHNO以模拟氮沉
降增加,设置对照(OkgN?hm2,CK)、低氮(30kgN?hm2,N30)、中氮(50kgN?hm2,N50)和高氮(100kgN·hm2,N100)4个氮素添加
水平,于牧草生长季(6-10月)、采用静态箱一气相色普法测定了CO2CIHI和NO的通量。结果表明:贝加尔针茅草原是CO2和N2O
的源、CH2的汇,与对照相比,氮素添加处理(N30、N50和N100)在显著增加植物地上生物量的同时,增加了CO2和NAO的累计排放
量,并降低了CH4的累计吸收量,处理间全球增温潜势表现为NIO0>N3O>N50>CK、所以N50处理既能显著增加草原植物地上生物
量,又能够减缓全球増温澘势的増加。相关分析表明:3种温室气体排放通量与土壤温度、有机碳和NO-N含量均显著相关(
0.05),CO2和N2O排放通量与土壤含水率显著正相关(P0.05),CH2和N2O排放通量与土壤NIーN含量极显著相关(P<0.01)。
关键词:贝加尔针茅草原;氮素添加;温室气体;仝球增温潜势
中图分类号:X511文献标志码:A文章编号:1672-2043(2017)08-1640-09doi:10.16541ja-.2017-0030
Effects of nitrogen addition on greenhouse gas flux in a Stipa baicalensis grassland in Inner Mongolia
ZIANG Jin-ling . LI Jie, ZILAOJian-ning, LIU Hong-mei, WANG Yu, YANG Dian-lin
(1. Agro-environmenlal Prolcction Inslilulc, Minisry of Agricullure, Tianjin 300191, C: eparlmenl of Horlicullurc, Shenyang Agricul-
tural University, Shenyang 110866. China; 3. Hulun Buir Grassland upervision and Administration Bureau of Inner Mongolia. Hulunbeier
021008, China
Abstract: There is great significance in exploring the response of temperate meow steppes to global climate change. The dynamics of
greenhouse gas(C O, C H and N2 0)luxes are essential for such; thus, the response of a grassland ecosystem lo nitro n addition in a Sti
baicalensis grassland in Inner Mongolia was measured. Hour nitrogen addition levels of0(CK), 30(N30), 50(N5)) and 100(N100)kg
hm were used to determine the effects of nitrogen addition on greenhouse gas emissions during the growing season(June to October), usin
the methods of static chamber-box gas chromatography. We found that the Stipa baicalensis grassland was a source of CO2 and N2O, but a
sink for I. Nitrogen addition increased the above-ground biomass of the plants significantly and enhanced the emissions of CO and N20.
whcrcas il decreased he uplake of CHA. The global warming polenta of the realmenls followed lhc ordcr ol N100>\30>\50>CK.Thus,
N50 Irealmenl nol only significantly inereased Ih above- mound biomass, bul also reduced the incrcase of global warming potenlial. The
fluxes of CO, CH and N: 0 showed significant correlations with soil temperature, organic carbon and NO-N content(P<0.05). CO and
N 0 fluxes also showed significantly positive relations with soil moisture( P<0.05). In addition, I and N 0 fluxes had significant rela-
lionships with soil NH:-nconlenl(P<0.01
Keywords: Sti baicalensis grassland; nitrogen addition; greenhouse gas: global warming poential
收稿日期:2017-01-06
作者简介:张金玲(1990-)女,辽守正河人,硕士研究生,主要研究方向为草地资源与生谷。F.-mail;zhangjin_taeyang(163.com
通信作者:杨殿林F-mail:yangdianlin(@caas.cn
基金项目:国家白然科学基金项目(31170435)
Proiect supported: The National Natural Science Foundation of China(31170435)
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