干旱区生态环境知识资源中心(Arid): 呼伦贝尔草原区CO

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	呼伦贝尔草原区CO_2源、汇及时空分布模拟研究
其他题名	Simulation of CO_2 source,sink,and flux temporal and spatial distributions in Hulun Buir grassland
	王伟 1; 方青青 1; 王国强 1; 李瑞敏 2; 薛宝林 1; 王红旗 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2018
卷号	38 期号:20 页码:7288-7299
中文摘要	近年来,随着全球气候变化和人为影响加剧,半干旱草地生态系统的碳循环受到剧烈影响.半干旱草原区域CO_2模拟研究主要集中于已有观测资料的地区,然而,观测资料缺乏的草原区CO_2通量模拟却鲜少有人研究.因此选择缺通量资料的呼伦贝尔草原地区为主要研究对象,并将VPRM模型应用于缺资料地区,模拟了该区域内2016年的NEE时空分布.结果表明:(1)在特旱年的气候条件下2016年全年都表现为微弱的碳源(全年NEE值为47.27 g C/m~2 ),且其变化趋势与降水和气温在年内变化趋势相近.(2)空间上,根据趋势来看NEE在空间分布由草原区向草甸区、森林区逐渐降低.基于植被分布情况,不同植被类型的区域碳排放顺序为:克氏针茅草原和大针茅草原>羊草草原>杂草草甸草原(以线叶菊等为主).(3)干旱胁迫是该地区表现为碳源的主要原因之一,而且降水与NEE表现出极显著的二次函数关系(R~2 = 0.938,P<0.001),说明了干旱气候条件下,随着月降水量的增加,草原生态系统出现碳源向碳汇转移的趋势.(4)地上生物量(AGB)与GPP和R_(eco)表现出了极显著的正相关关系(R~2分别为0.89和0.9,P<0.01),与NEE表现出了极显著的负相关关系(R~2 = 0.68,P<0.01),说明了草原的地上生物量增加能有效地降低二氧化碳排放.
英文摘要	In recent years,the carbon cycle has been severely affected by global change and human being in semi-arid grassland ecosystems. The simulation of carbon flux mainly focus on the regions where observation data are available. However,few studies paid attention to the simulation of carbon flux in the regions which paucity of observation data. Herein,Hulun Buir grassland,which is lack of observation data,was selected as the main study area. Additionally,the vegetation photosynthesis and respiration model ( VPRM) was used to simulate the spatial and temporal distribution of net ecosystem exchange ( NEE) in 2016. The results showed that: ( 1) In 2016,Hulun Buir grassland was a weak carbon source under the extreme drought conditions ( annual NEE value 47.27 g C/m~2 ),and the trend of daily NEE of t was similar to those of precipitation and temperature. ( 2) The spatial distribution of NEE gradually decreased from the grassland to the meadow and forest areas. Based on vegetation distribution,The region in different vegetation type were ordered by carbon emission as follow: Stipa krylovii and Stipa grandis steppes > Leymus meadows > forb meadows,( dominated by plants such as Filifolium sibiricum),( 3) Drought stress was one of the main reason for the region being a carbon source. There was a significant quadratic correlation between precipitation and NEE ( R~2 = 0.938,P<0.001). The results implied that the grassland ecosystem tends to shift from a carbon source to a carbon sink with the increase in precipitation under drought conditions. ( 4 ) Aboveground biomass ( AGB) showed a significant positive correlation with gross primary production ( GPP) and ecosystem respiration ( R_(eco) ) ( R~2 = 0.89 and 0.9,respectively,P < 0.01),and a significant negative correlation ( R~2 = 0.68,P<0.01) with NEE,indicating that above-ground biomass ( AGB) growth can effectively reduce carbon dioxide emissions in grassland ecosystems.
中文关键词	草地生态系统 ; 碳源/汇 ; 干旱气候 ; VPRM模型 ; 时空特征
英文关键词	grassland ecosystem carbon source /sink arid climate VPRM model temporal and spatial characteristics
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6371384
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238150
作者单位	1.北京师范大学水科学研究院, 北京 100875, 中国; 2.中国地质环境监测院, 北京 100081, 中国
推荐引用方式 GB/T 7714	王伟,方青青,王国强,等. 呼伦贝尔草原区CO_2源、汇及时空分布模拟研究[J]. 北京师范大学,2018,38(20):7288-7299.
APA	王伟,方青青,王国强,李瑞敏,薛宝林,&王红旗.(2018).呼伦贝尔草原区CO_2源、汇及时空分布模拟研究.生态学报,38(20),7288-7299.
MLA	王伟,et al."呼伦贝尔草原区CO_2源、汇及时空分布模拟研究".生态学报 38.20(2018):7288-7299.