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首页> 外文期刊>Environmental Pollution >Quantifying ozone uptake at the canopy level of spruce, pine and larch trees at the alpine timberline: an approach based on sap flow measurement
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Quantifying ozone uptake at the canopy level of spruce, pine and larch trees at the alpine timberline: an approach based on sap flow measurement

机译：量化高山林线云杉，松树和落叶松树冠层的臭氧吸收量：一种基于树液流量测量的方法

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摘要

Micro-climatic and ambient ozone data were combined with measurements of sap flow through tree trunks in order to estimate whole-tree ozone uptake of adult Norway spruce (Picea abies), cembran pine (Pinus cembra), and European larch (Larix decidua) trees. Sap flow was monitored by means of the heat balance approach in two trees of each species during the growing season of 1998. In trees making up the stand canopy, the ozone uptake by evergreen foliages was significantly higher than by deciduous ones, when scaled to the ground area. However, if expressed per unit of whole-tree foliage area, ozone flux through the stomata into the needle mesophyll was 1.09, 1.18 and 1.40 nmol m~(-2) s~(-1) in Picea abies, Pinus cembra and Larix decidua, respectively. These fluxes are consistent with findings from measurements of needle gas exchange, published from the same species at the study site. It is concluded that the sap flow-based approach offers an inexpensive, spatially and temporally integrating way for estimating ozone uptake at the whole-tree and stand level, intrinsicly covering the effect of boundary layers on ozone flux.
机译：将微气候和周围的臭氧数据与树干树干液流的测量结果相结合，以估计成年挪威云杉（Picea abies），松柏（Pinus cembra）和欧洲落叶松（Larix decidua）树的整棵树对臭氧的吸收。在1998年的生长季节中，通过热平衡方法对每种树种的两棵树进行汁液流量监测。在构成标准林冠的树中，常绿乔木的落叶对臭氧的吸收显着高于落叶乔木。地面区域。但是，如果以每整棵树的叶面积表示，则在云杉，松树和落叶松中通过气孔进入针叶肉的臭氧通量为1.09、1.18和1.40 nmol m〜（-2）s〜（-1）。 ， 分别。这些通量与研究地点相同物种发表的针状气体交换测量结果一致。结论是，基于树液流动的方法提供了一种廉价，时空整合的方法来估算整棵树和林分一级的臭氧吸收，本质上涵盖了边界层对臭氧通量的影响。

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