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呼伦贝尔草原区CO2源、汇及时空分布模拟研究
引用本文:王伟,方青青,王国强,李瑞敏,薛宝林,王红旗.呼伦贝尔草原区CO2源、汇及时空分布模拟研究[J].生态学报,2018,38(20):7288-7299.
作者姓名:王伟  方青青  王国强  李瑞敏  薛宝林  王红旗
作者单位:北京师范大学水科学研究院;中国地质环境监测院;西安交通大学叶轮机械研究...;西安;大连工业大学纺织与材料工...;中国农业科学院草原研究所...;(1.中国科学院电子学研...;1西安交通大学人居环境与...;南京;710049;1.;华中科技大学
基金项目:西安交通大学叶轮机械研究...;西安;大连工业大学纺织与材料工...;中国农业科学院草原研究所...;(1.中国科学院电子学研...;1西安交通大学人居环境与...;南京;710049;1.;华中科技大学
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 gC/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,P0.001),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Reco表现出了极显著的正相关关系(R~2分别为0.89和0.9,P0.01),与NEE表现出了极显著的负相关关系(R~2=0.68,P0.01),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。

关 键 词:草地生态系统  碳源/汇  干旱气候  VPRM模型  时空特征
收稿时间:2017/9/9 0:00:00
修稿时间:2018/5/2 0:00:00

Simulation of CO2 source, sink, and flux temporal and spatial distributions in Hulun Buir grassland
WANG Wei,FANG Qingqing,WANG Guoqiang,LI Ruimin,XUE Baolin and WANG Hongqi.Simulation of CO2 source, sink, and flux temporal and spatial distributions in Hulun Buir grassland[J].Acta Ecologica Sinica,2018,38(20):7288-7299.
Authors:WANG Wei  FANG Qingqing  WANG Guoqiang  LI Ruimin  XUE Baolin and WANG Hongqi
Institution:College of Water Sciences, Beijing Normal University, Beijing 100875, China,College of Water Sciences, Beijing Normal University, Beijing 100875, China,College of Water Sciences, Beijing Normal University, Beijing 100875, China,China Institute of Geo-environmental Monitoring, Beijing 100081, China,College of Water Sciences, Beijing Normal University, Beijing 100875, China and College of Water Sciences, Beijing Normal University, Beijing 100875, China
Abstract: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/m2), 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 (R2=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 (Reco) (R2=0.89 and 0.9, respectively, P < 0.01), and a significant negative correlation (R2=0.68, P < 0.01) with NEE, indicating that above-ground biomass (AGB) growth can effectively reduce carbon dioxide emissions in grassland ecosystems.
Keywords:grassland ecosystem  carbon source/sink  arid climate  VPRM model  temporal and spatial characteristics
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