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收稿日期: 2009-01-15
录用日期: 2009-04-23
网络出版日期: 2010-07-01
Variation in net CO2 exchange, gross primary production and its affecting factors in the planted pasture ecosystem in Sanjiangyuan Region of the Qinghai-Tibetan Plateau of China
Received date: 2009-01-15
Accepted date: 2009-04-23
Online published: 2010-07-01
为了揭示三江源区垂穗披碱草(Elymus nutans)人工草地生态系统(100°26′-100°41′ E, 34°17′-34°25′ N, 海拔3 980 m)的净生态系统CO2交换(NEE), 该研究利用2006年涡度相关系统观测的数据分析了该人工草地的NEE, 总初级生产力(GPP)、生态系统呼吸(Reco)以及Reco/GPP的变化特征及其影响因子。CO2日最大吸收值为6.56 g CO2·m-2·d-1, 最大排放值为4.87 g CO2·m-2·d-1。GPP年总量为1 761 g CO2·m-2, 其中约90%以上被生态系统呼吸所消耗, CO2的年吸收量为111 g CO2·m-2。5月的Reco/GPP略高于生长季的其他月份, 为90%; 6月Reco/GPP比值最低, 为79%。生态系统的呼吸商(Q10)为4.81, 显著高于其他生态系统。该研究表明: 生长季的NEE主要受光量子通量密度(PPFD)、温度和饱和水汽压差(VPD)的影响, 生态系统呼吸则主要受土壤温度的控制。
关键词： 涡度相关; 总初级生产力; 净生态系统CO2交换; 人工草地; 青藏高原
吴力博, 古松, 赵亮, 徐世晓, 周华坤, 冯超, 徐维新, 李英年, 赵新全, 唐艳鸿 . 三江源地区人工草地的生态系统CO2净交换、总初级生产力及其影响因子[J]. 植物生态学报, 2010 , 34(7) : 770 -780 . DOI: 10.3773/j.issn.1005-264x.2010.07.002
Aims Our objective was to understand seasonal and diurnal variations in CO2 exchange of a grassland ecosystem by clarifying the carbon cycle and its affecting factors for a planted pasture ecosystem in the Sanjiangyuan Region of the Qinghai-Tibetan Plateau.
Methods We used the eddy covariance method to measure net ecosystem CO2 exchange (NEE) and environmental factors in the planted pasture (Elymus nutans) ecosystem in 2006.
Important findings Daily maximum uptake and release of CO2 were 6.56 and -4.87 g CO2·m-2·d-1, respectively. Maximum rates of NEE uptake and release were -0.35 and 0.22 mg CO2·m-2·s-1, respectively. Annual gross primary production (GPP) was 1 761 g CO2·m-2·a-1, of which more than 90% was consumed by ecosystem respiration (Reco). Annual NEE was -111 g CO2·m-2. In the growing season, maximum and minimum Reco/GPP values were 90% in May and 79% in June, respectively. The Q10 was 4.81, which is higher than in other ecosystems. The NEE was mostly influenced by photosynthetic photon flux density (PPFD), temperature and vapor pressure deficit (VPD). The Reco was mainly affected by soil temperature at 5 cm depth (Ts).
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