基于树干液流技术对杨树冠层吸收臭氧特征的分析  

Uptake Characteristic of Ozone on Poplar Canopy by Sap Flow Techniques

作　　者：陈波[1] 鲁绍伟[1] 李少宁[1] 

机构地区：[1]北京市农林科学院林业果树研究所,北京100093

出　　处：《东北林业大学学报》2015年第1期72-79,共8页Journal of Northeast Forestry University

基　　金：北京市优秀人才培养资助个人项目(2012D002020000003)

摘　　要：基于树干液流的技术方法,在自然状态下对杨树（Populus spp.）臭氧吸收特征进行了研究。结果表明：臭氧质量浓度日变化呈单峰型,其变化范围为25.5~175.0μg·m-3;臭氧吸收速率（FO3）和臭氧吸收导度（GO3）日变化均为单峰型;FO3均值为（78.22±39.45）nmol·m-2·s-1,GO3均值为（127.60±64.35）mmol·m-2·s-1;环境因子水汽压亏缺（D）、太阳辐射（Rs）和风速对FO3和GO3的响应,导致臭氧吸收通量相对较高,D对更高的GO3和FO3更敏感,随着D增加臭氧吸收减少,Rs在达到50 W·m-2时GO3和FO3也有所降低;臭氧质量浓度抑制树木蒸腾,影响液流密度的变化;臭氧质量浓度超过临界水平引起树木相应的响应,杨树AOT40为72.02 mg·m-3·h-1,远超过对树木危害的臭氧质量浓度的临界水平10.71 mg·m-3·h-1,说明了杨树的高臭氧风险,树干液流技术适用于计算植物的臭氧吸收量。By sap flow,we studied the ozone uptake characteristics of poplar under natural conditions. The ozone concentration diurnal variation was single peak type with the change of 25.5-175.0 μg·m-3. The ozone uptake rate（ FO3） and conductance（ GO3） of diurnal variation were unimodal. The average of FO3 was 78.22±39.45 nmol·m-2·s-1,the average of GO3 was 127.60± 64. 35 mmol·m-2·s-1. The environmental factors,vapor pressure deficit（ D）,solar radiation（ Rs） and wind speed of FO3 and GO3response led to ozone uptake flux relatively high,D of higher GO3 and FO3were more sensitive.With the increase of D the ozone uptake decreased,as well as with the decrease of Rsat 50 W·m-2GO3 and FO3. The ozone concentration inhibited transpiration,and changed sap flow density. When the ozone concentration exceeded the critical level induced by the corresponding response of trees,poplar AOT40 was 72.02 mg·m-3·h,far more than the critical level of ozone concentration trees against 10.71 mg·m-3·h,and poplar was with the ozone risk.

关 键 词：杨树 树干液流 冠层 臭氧吸收 

分 类 号：S715.4[农业科学—林学]