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Stem increment sensor DRL26C

Company: EMS Brno
Catalog#: DRL26C
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Forest GPP Calculation Using Sap Flow and Water Use Efficiency Measurements
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2017-04-20
[Abstract]  This is a protocol to evaluate gross primary productivity (GPP) of a forest stand based on the measurements of tree’s sap flow (SF), 13C derived water use efficiency (WUE), and meteorological (met) data. GPP was calculated from WUE and stomatal conductance (gs), the later obtained from SF up-scaled from sampled trees to stand level on a daily time-scale and met data. WUE is obtained from 13C measurements in dated tree-ring wood and/or foliage samples. This protocol is based on the recently published study of Klein et al., 2016. [摘要]  这是一个根据树木流量(SF),超临界流量(WUE)和气象(met)的测量结果来评估林分总生产力(GPP)的方案,数据。从WUE和气孔导度(g s )计算GPP,后者是从日常时间尺度上从抽样树到定级的SF升高得到的,并且满足数据。 WUE是从日期的树木木材和/或树叶样品中的 13 C测量获得的。该协议基于最近发表的Klein等人的研究,2016年。

森林通过CO 2同化和呼吸以及通过影响CO 2浓度浓度在地球气候中对陆地碳循环发挥重要作用(Luyssaert et al。 2007; Bonan,2008; Canadell和Raupach,2008; Reichstein等人,2013)。总生产力(GPP),植物通过光合作用的碳吸收,是一般土地生物圈和特别是粮食生产中有机物质的最终来源。
 生态系统规模中的GPP主要是利用涡度协方差(EC)技术得出的,因为EC测量的净生态系统CO 2 交换(NEE)和每日推测的生态系统呼吸(Re)之间的差异, 。后者通过根据对温度和土壤湿度的响应的经验方程,将测量的夜间NEE(其等于生态系统呼吸,Re)推广到白天获得(Aubinet等人,2000; Baldocchi,2003; Reichstein等人,2005; ...

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