北京林业大学学报Issue(7)：1-8,8.DOI:10.13332/j.1000--1522.20140012
不同优势等级杨树人工林吸收臭氧特征
Ozone uptake characteristics in different dominance hierarchies of poplar plantation
摘要
Abstract
The ozone uptake characteristics of poplar under natural conditions in different dominance hierarchies were studied based on sap flow methods. The results showed that: the diurnal variation of ozone concentration was of single peak type, with the value ranging between 25.5 and 175.0μg/m3;the tendency of its variation was consistent with that of temperature;the diurnal variations of the ozone uptake rate ( FO3 ) and canopy ozone conductance ( GO3 ) in different tree shape levels were of unimodal type;the change of FO3 followed an order of depressed tree (43.24 nmol/(m2·s)) > middle tree (29.77 nmol/( m2·s) ) > dominant tree (24.56 nmol/( m2·s) ) , while the value of GO3 ranked as the dominant tree (101.59 mmol/( m2·s) ) > depressed tree (92.92 mmol/( m2·s) ) > middle tree (81.60 mmol/( m2· s)). The mean value of FO3 was (32.52±7.87) nmol/(m2·s), while that of GO3 was (92.04±8.18) mmol/(m2·s) in different tree shape levels. The effects of Rs, VPD and t on GO3 and FO3 were in an order of dominant tree > depressed tree > middle tree. Peak concentrations of ozone lagged behind the peak value of sap flow density, and over-high ozone concentration would inhibit transpiration. There was a good consistency between the changes of atmospheric ozone concentration and sap flow density, and sap flow technique is suitable for the calculation of ozone uptake of plants.关键词
优势等级/杨树/臭氧吸收/冠层导度Key words
dominance hierarchy/poplar/ozone uptake/canopy conductance分类
农业科技引用本文复制引用
..不同优势等级杨树人工林吸收臭氧特征[J].北京林业大学学报,2015,(7):1-8,8.基金项目
第一作者:陈波,研究实习员。主要研究方向:水土保持。 Email:zhyechb2010@163. com，地址:100093北京市海淀区香山瑞王坟甲12号北京市农林科学院林业果树研究所312室。 （）
