文献类型：期刊文献

中文题名：核桃冠层温度与冠气温差变化特征及其对环境因素的响应

英文题名：Temporal Variation Characteristics of Walnut Canopy Temperature and Canopy-air Temperature Difference and Their Response to Environmental Factors

作者：毛炼[1,2] 杨滢[3] 何子奇[1,2] 陆森[1,2] 刘琳奇[3] 张劲松[1,2] 王宝庆[4]

第一作者：毛炼

机构：[1]林木资源高效生产全国重点实验室,国家林业和草原局林木培育重点实验室,中国林业科学研究院林业研究所,北京100091;[2]南京林业大学南方现代林业协同创新中心,江苏南京210037;[3]江西省林业科学院,江西南昌城市生态系统定位观测研究站,南昌市城市森林生态重点实验室,江西南昌330013;[4]阿克苏森林生态国家观测研究站,新疆阿克苏843000

年份：2025

卷号：38

期号：1

起止页码：50-60

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：;北大核心:【北大核心2023】；

基金：新疆维吾尔自治区“揭榜挂帅”项目;江西省自然科学基金(20242BAB20260);江西省林业科学院基础研究与人才科研专项(2024520801)。

语种：中文

中文关键词：冠层温度;冠气温差;环境因子;时滞效应

外文关键词：canopy temperature;canopy-air temperature difference;environmental factors;time lag

分类号：S715;S716

摘要：[目的]研究核桃冠层温度与冠气温差变化特征以及与环境因子之间的关系,为基于热指数诊断核桃水分状况提供理论依据。[方法]以新疆阿克苏地区核桃果园为研究对象,连续同步观测核桃冠层温度与环境参数,定期测定核桃叶片蒸腾速率,分析核桃冠层温度与冠气温差的变化特征,确定冠层表面能量分量对冠层温度的影响,探讨冠层温度与冠气温差对环境因子的响应机制。[结果]核桃冠层温度与冠气温差均呈现单峰变化趋势,但冠层温度变化与空气温度变化之间存在时间滞后效应。水分充足条件下,净辐射、蒸腾潜热以及对流换热在冠层表面能量平衡中的占比分别为54.60%~55.42%、40.56%~45.11%以及-0.53%~4.84%之间,最大可使冠层温度变化11.12、7.22以及1.65℃。冠层温度与冠气温差对环境条件的响应存在差异,核桃冠层温度与空气温度的相关性最好,而冠气温差与太阳辐射的相关性最佳,核桃冠气温差对土壤水分变化的敏感性相对于冠层温度更强。风速对冠层温度与冠气温差均存在一定影响。[结论]使用热指数诊断核桃果园水分状况是可行的,未来在构建核桃无水分胁迫基线与无蒸腾基线时,需考虑太阳辐射与风速对冠气温差的影响;同时,在使用热指数诊断核桃水分状况时,需考虑冠层温度与空气温度之间的时滞效应。
[Objective]The canopy temperature and canopy-air temperature difference are important parameters for determining plant water status and are affected by environmental conditions.Analyzing the canopy temperature and canopy-air temperature difference dynamics and their relationships with environmental factors are important to provide a theoretical basis for the water status determination of walnut orchard through a thermal index method.[Method]The research was performed in a walnut orchard in Aksu,Xinjiang.Measurements of canopy temperature,environmental parameters,and transpiration rate were continuously and synchronically conducted.The variation characteristics of walnut canopy temperature and canopy-air temperature difference were analyzed.Then the influences of canopy surface energy components on canopy temperature were determined,and the responses of canopy temperature and canopy-air temperature difference to environmental factors were studied.[Results]The diurnal variation curves of walnut canopy temperature and canopy-air temperature difference were both unimodal,and a time lag existed between the canopy-temperature dynamic and the air-temperature dynamic.Under well-watered conditions,the proportions of net radiation,latent heat of transpiration and convective heat transfer in the energy balance of canopy surface were 54.60%to 55.42%,40.56%to 45.11%,and-0.53%to 4.84%,respectively,which can change the canopy temperature by maximum 11.12、7.22、and 1.65℃,respectively.The responses of canopy temperature and canopy-air temperature difference to external environmental conditions were different.The canopy temperature had the strongest correlation with air temperature,while the relevance between the canopy-air temperature difference and solar radiation was the highest.Compared to the canopy temperature,canopy-air temperature difference was more sensitive to the changes in the soil water content.Moreover,wind speed also affected both canopy temperature and canopy-air temperature difference.[Conclusion]It is feasible to use thermal index to track the water status of walnut orchards.During the establishment of non-water stress baseline or non-transpiration baseline in future,the effects of solar radiation and wind speed on the canopy-air temperature difference should be considered.Meanwhile,the effect of the time lag between canopy temperature and air temperature also should be taken into account when using thermal index to track the water status of walnut orchards.