贵阳市木本植物春季物候对昼夜温度响应的差异  

Divergent Response of Spring Phenology of Woody Plants to Daytime and Nighttime Temperature in Guiyang City

作　　者：于海英 YU Haiying(College of Agroforestry Engineering and Planning,Tongren University,Tongren Guizhou 554300;Guizhou Provincial Key Laboratory for Biodiversity Conservation and Utilization in the Fanjing Mountain Region,Tongren University,Tongren Guizhou 554300)

机构地区：[1]铜仁学院农林工程与规划学院,贵州铜仁554300 [2]铜仁学院贵州省梵净山地区生物多样性保护与利用重点实验室,贵州铜仁554300

出　　处：《现代农业科技》2023年第10期107-115,共9页Modern Agricultural Science and Technology

基　　金：国家自然科学基金(32160287);贵州省普通高等学校科技拔尖人才支持计划项目(黔教合KY字[2017]088);贵州省科技计划项目(黔科合基础-ZK[2022]一般560);铜仁学院博士科研启动基金(trxyDH1617)。

摘　　要：为了探究贵阳市木本植物春季物候对昼夜(最高及最低)温度响应的差异,增进对亚热带植物物候对气候变化响应机制的理解,本研究采用相关分析、线性回归及t检验等方法,对贵阳市40余种木本植物展叶始期和始花期对最高气温、最低气温响应的相关时段及敏感度进行了分析。结果表明:贵阳市木本植物的展叶始期和始花期对最低气温响应的敏感度分别为-7.41 d/℃和-7.32 d/℃,显著高于对最高气温的敏感度(-4.06 d/℃和-4.45 d/℃),即温度上升1℃的情况下,最低气温使春季物候提前的天数平均比最高气温多3 d左右;始花期与其对最低温度的敏感度成显著负相关,说明始花期较早的植物对最低温度的敏感度较高;展叶始期和始花期对最低气温响应的相关时段平均值分别为73 d和86 d,均显著长于最高气温的47 d和64 d。In order to explore the difference in the response of spring phenology of woody plants to daytime(maximum)and nighttime(minimum)temperature in Guiyang,which could enhance the understanding of the response mechanism of plant phenology in subtropics to climate change,this study analyzed the temperature-relevant periods and sensitivity in relation to the response of leaf unfolding dates and first flowering dates of more than 40 woody plants to maximum temperature and minimum temperature in Guiyang City by using the methods of correlation analysis,linear regression and t test.The results showed that the sensitivity of two phenological dates to the minimum temperature(-7.41 d/℃and-7.32 d/℃)was much higher than that to the maximum temperature(-4.06 d/℃and-4.45 d/℃),which indicated that with an increase of 1℃in temperature,minimum temperature would advance spring phenology 3 days more than maximum temperature would do.In addition,there was a significantly negative correlation between the first flowering dates and its sensitivity to minimum temperature,indicating that plants with earlier flowering dates had higher sensitivity to minimum temperature.Average temperature-relevant periods in relation to the response of leaf unfolding and first flowering dates to minimum temperature(73 d and 86 d)were much longer than those to maximum temperature(47 d and 64 d).

关 键 词：木本植物 春季物候 展叶始期 始花期 最高气温 最低气温 温度相关时段 温度敏感度 贵州贵阳 

分 类 号：Q948.1[生物学—植物学]