不同天气条件下山杏树干液流速率对环境因子变化的响应  

Responses of Trunk Sap Flow of Armeniaca sibirica to Varied Environmental Factors in Different Weather Conditions

作　　者：韩新生[1,2] 许浩 安钰[1] 郭永忠[1] 董立国[1] 王月玲[1] 万海霞[1] 蔡进军[3] Han Xinsheng;Xu Hao;An Yu;Guo Yongzhong;Dong Liguo;Wang Yueling;Wan Haixia;Cai Jinjun(Institute of Forestry and Grassland Ecology,Ningxia Academy of Agriculture and Forestry Sciences/Ningxia Key Laboratory of Desertification Control and Soil and Water Conservation/Research Center for Ecological Restoration and Multi-functional Forestry,Yinchuan Ningxia 750002,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Institute of Agricultural Resources and Environment,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan Ningxia 750002,China)

机构地区：[1]宁夏农林科学院林业与草地生态研究所,宁夏防沙治沙与水土保持重点实验室,宁夏生态修复与多功能林业综合研究中心,宁夏银川750002 [2]中国水利水电科学研究院,北京100038 [3]宁夏农林科学院农业资源与环境研究所,宁夏银川750002

出　　处：《西南林业大学学报(自然科学)》2023年第6期54-64,共11页Journal of Southwest Forestry University:Natural Sciences

基　　金：宁夏农业高质量发展和生态保护科技创新示范课题(NGSB-2021-14-01,NGSB-2021-14-02,NGSB-2021-11-06)资助;宁夏重点研发计划(2021BEG03017,2020BCF01001)资助;IWHR基本科研业务费专项(SC0145B012021)资助;宁夏自然科学基金项目(2019AAC03148)资助;宁夏“青年科技人才托举工程”项目“宁南山区山杏树干液流密度及蒸腾量研究”资助。

摘　　要：以宁夏黄土丘陵区山杏为研究对象,于2019年生长季监测树干液流速率,同步观测环境因子包括气象因子、土壤水分及土壤温度等指标,分析不同天气条件下树干液流速率与气象、土壤因子之间的关系,并量化了环境因子对树干液流变化的贡献量。结果表明:在晴天,太阳辐射对树干液流变化的贡献量最大,占比为80.8%,饱和水汽压差和风速的贡献量较小,分别占2.7%和1.4%;在多云天气,太阳辐射、气温、土壤温度对树干液流变化的贡献量占比分别为44.9%、9.3%和13.7%;在雨天,太阳辐射对树干液流变化的贡献量占比为60.4%,饱和水汽压差的贡献量为4.7%。随着天气条件从晴天、多云、到雨天的转变,环境因子对树干液流变化的总贡献量依次降低,液流速率与大气相对湿度、饱和水汽压差的相关性逐步增大,与气温、土壤水分、土壤温度的相关性逐渐减小。在3类不同天气条件下,太阳辐射均是树干液流变化的主控气象因子,饱和水汽压差、气温、土壤温度、风速等居次。研究结果可为变化环境下细致刻画植被蒸腾对外界环境因子的响应特征及理解相关驱动机制提供参考。The sap flow rate of Armeniaca sibirica,environmental factors including meteorological factors,soil moisture,and soil temperature were monitored simultaneously in the growing season of 2019 in a loess hilly area of Ningxia.The relationships between the sap flow rate and environmental factors were analyzed under different weather conditions,and the contributions of each main environmental factor to the sap flow variation were quantified separately.The results showed that in sunny days,solar radiation was the greatest conctributor to the sap flow variation(80.8%),then were the saturation vapor pressure deficit(2.7%)and wind speed(1.4%).In cloudy days,solar radiation,air temperature and soil temperature contributed 44.9%,9.3%and 13.7%to the sap flow varation respectively.In rainy days,the contribution of solar radiation was 60.4%,and the saturation vapor pressure deficit was 4.7%.From sunny,cloudy,to rainy days,the total contribution of environmental factors to the sap flow variatoin decreased in turn,the correlation between sap flow rate and air relative humidity and saturation vapor pressure deficit gradually increased,and the correlation between sap flow rate and air temperature,soil moisture and soil temperature gradually decreased.Under the 3 weather conditions,solar radiation was the main meteorological factor controlling the sap flow variation,then were the saturation vapor pressure deficit,air temperature,soil temperature,and wind speed.The results provide a theoretical basis for a detailed characterization of vegetation transpiration response to environmental factors and a better understanding of relevant driving mechanisms.

关 键 词：树干液流 环境因子 天气条件 山杏 

分 类 号：S715.2[农业科学—林学]