|Table of Contents|

Ozone Uptake at the Canopy Level in Four Kinds of Sapling Based on Sap Flow Measurements

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年23
Page:
44-51
Research Field:
Publishing date:

Info

Title:
Ozone Uptake at the Canopy Level in Four Kinds of Sapling Based on Sap Flow Measurements
Author(s):
LI Shaoning1; 2; ZHANG Weining3; LU Shaowei1; 2; ZHAO Yunge1; 2; TAO Xueying4; ZHAO Na1; 2
(1.Beijing Academy of Forestry and Pomology Sciences,Beijing 100093；2.Yanshan Forest Ecosystem Research Station of Beijing,Beijing 100093；3.Hebei Academy of Fine Arts,Shijiazhuang,Hebei 050700；4.Forestry College,Shenyang Agricultural University,Shenyang,Liaoning 110866)
Keywords:
sap flow; environmental factors; sapling; ozone
PACS:
-
DOI:
10.11937/bfyy.20194977
Abstract:
Four common saplings,namely Sophora japonica，Koelreuteria paniculata，Salix babylonica and Robinia pseudoacacia were used as materials,based on sap flow measurements,the differences of ozone uptake by different tree canopy and their response to environmental factors were studied,in order to provide data reference for urban air quality improvement and tree cultivation and maintenance.The results showed that the daily mean value of atmospheric ozone concentration in summer was significantly higher than that in autumn,and the variation law was unimodal.The diurnal variation of ozone uptook by trees in summer was similar to that of sap flow,which was a single peak curve,but its start-up time was 3 hours later than sap flow.The maximum ozone absorption rate of Sophora japonica,Koelreuteria paniculata and Salix babylonica reached the maximum at 14:00,which were 1.50,0.80,2.41 nmol·m-2·s-1,respectively,while that of Robinia pseudoacacia was 0.84 nmol·m-2·s-1 at 12:00.The daily ozone accumulation of different tree species was Salix babylonica (0.073 mmol·m-2)>Sophora japonica (0.042 mmol·m-2)>Robinia pseudoacacia (0.025 mmol·m-2)>Koelreuteria paniculata (0.024 mmol·m-2).The correlation test and stepwise regression equation (R2 were above 0.65) showed that all environmental factors were significantly correlated with ozone absorption (P<0.01),and the air relative humidity was negatively correlated.The regression equation shows that the key factors of ozone absorption by trees were atmospheric ozone concentration,solar radiation and VPD.

References:

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Last Update: 2021-02-18