生态与农村环境学报2019，Vol.35Issue(2)：189-196,8.DOI:10.19741/j.issn.1673-4831.2017.0869
北京典型天气下的4种阔叶树种液流特征及其影响因素
Characteristics and Influencing Factors in Sap Flow of Four Broadleaved Tree Species for Typical Weather Conditions of Beijing
摘要
Abstract
To illustrate the differences in characteristics of sap flow of broadleaved species and their main influences in typical weather condition, sap flow rates of four broadleaved tree species were continuously monitored through the thermal dissipation probes (TDP) in plain areas of Beijing, combining simultaneous observations of environmental factors via automatic weather station, to explore the transpiration patterns of tree species and influencing environmental factors. The results show that diurnal variations in sap flow rates of 4 broadleaved species presented single-peak curves in sunny days, bimodel curves in cloudy days and multi-peaks curves in rainy days. The sap flow began at 6: 00 a. m. in sunny and cloudy days which were earlier than that in rainy days (06: 30 a.m.). The diurnal patterns of solar radiation were consistent with that in sap flow. There exist interactions among environmental factors. Particularly, there is a lag-effect in variations between solar radiation and temperature. Considering the influencing extent of environmental factors on sap flow, solar radiation, temperature, wind speed and water vapor pressure deficit (VPD) were significantly positively related with the sap flow rates of four tree species (P＜0.01), whereas there were remarkable negative correlationships between relative air humidity and sap flow rates (P＜0.01). Diurnal variations of environmental factors were not in synchrony with that of sap flow rates of tree species. Based on the principal component analysis, as the main influentors, air temperature and solar radiation were responsible for 74.37％ on variations of sap flow of tree species, while water vapor pressure deficit contributing 14.33％. Total monthly water consumptions of four tree species in July were ranked as Populus tomentosa (289. 23 kg)＞ Robinia pseudoacacia (235.04 kg)＞Sophora japonica (151.53 kg)＞ Koelreuteria paniculata (133.80 kg). The daily water consumption of above species had the same sequence with that of monthly water consumption mentioned above. The water consumptions of tree species in sunny days were observed higher than that in rainy days. The results of the study can provide a certain scientific basis for the comprehensive evaluation on ecological hydrological processes and determination on influencing factors of garden tree species in Beijing.关键词
阔叶树/树干液流/环境因子/典型天气Key words
broadleaved trees/sap flow/environmental factors/typical weather conditions分类
农业科技引用本文复制引用
李少宁,鲁绍伟,赵云阁,赵娜,陈波..北京典型天气下的4种阔叶树种液流特征及其影响因素[J].生态与农村环境学报,2019,35(2):189-196,8.基金项目
北京市农林科学院基金(QNJJ201532) （QNJJ201532）
北京市农林科学院科技创新能力建设资助项目(KJCX20160301,KJCX20150205,KJCX 20170601) （KJCX20160301,KJCX20150205,KJCX 20170601）
林业科技创新平台运行补助项目(2017-LYPT-DW-001) （2017-LYPT-DW-001）
科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(PXM2017_014207_000043) （PXM2017_014207_000043）
