文献类型：期刊文献

中文题名：红锥树干径向水分亏缺对饱和水汽压差的时滞响应

英文题名：Time lag of stem water deficit in response to vapor pressure deficit of Castanopsis hystrix

作者：刘士玲[1,2,3] 杨保国[1] 郑路[1,2,3] 张培[1] 庞圣江[1] 陈琳[1,2,3] 闵惠琳[1,2,3] 舒韦维[1,2,3] 田祖为[1] 黄荣[1]

第一作者：刘士玲

机构：[1]中国林业科学研究院热带林业实验中心,广西崇左532600;[2]广西友谊关森林生态系统国家定位观测研究站,广西崇左532600;[3]崇左凭祥友谊关森林生态系统广西野外科学观测研究站,广西崇左532600

年份：2024

卷号：44

期号：9

起止页码：94-104

中文期刊名：中南林业科技大学学报

外文期刊名：Journal of Central South University of Forestry & Technology

收录：CSTPCD;;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项(CAFYBB2021MA002);广西自然科学基金(2019GXNSFBA245067)。

语种：中文

中文关键词：径向变化动态;径向变化记录仪;红锥;时滞效应;林木分化等级

外文关键词：radial variation dynamics;dendrometer;Castanopsis hystrix;time-lag effect;tree differentiation classes

分类号：S718.43

摘要：【目的】探索作为树干水分变化状况指标的树木水分亏缺(TWD)变化特征及其与饱和水汽压差(VPD)的关系,揭示径向变化对环境水分胁迫的响应特征,为合理指导红锥人工林经营提供科学依据和数据支持。【方法】利用径向变化记录仪记录不同分化等级红锥树干径向变化过程,同步监测环境因子,分析TWD对VPD的响应特征。【结果】不同分化等级红锥的TWD波动趋势相似,TWD随着VPD的变化而变化,但并不同步。小时尺度上,TWD和VPD显著正相关(r=0.488,r=0.489,r=0.512,P<0.01),划分失水期和复水期后,两个时期的TWD和VPD也显著正相关,且失水期的相关性增强(r=0.623,r=0.667,r=0.593,P<0.01)。日尺度上,无论是否划分失水期和复水期,二者均显著正相关,但相关性减弱。前后1天内的时滞响应分析结果显示,无论分化等级,TWD与VPD显著正相关(P<0.01);划分失水期和复水期后,在任何时间段考虑时滞响应时也均达到显著正相关,失水期的相关性强于复水期的相关性。未划分失水期和复水期时,不同分化等级红锥TWD对VPD响应滞后时间均为3 h。划分失水期和复水期后,失水期TWD对VPD响应滞后时间缩短,复水期TWD对VPD响应滞后时间延长。优势木、中等木和被压木复水期的滞后时间比失水期分别长3、4和5 h。VPD大幅度波动条件(VPD_(L))下,随着VPD的反复升降,TWD表现为失水-复水交替出现,变化的总体趋势是上升的;VPD小幅度波动条件(VPDs)下,TWD变化趋势较平缓,两种条件下TWD对VPD的响应均存在时滞。无论分化等级,VPD_(L)条件下TWD与VPD之间的相关性(r=0.550,r=0.553,r=0.584,P<0.01)均强于VPDs下的相关性(r=0.256,r=0.260,r=0.281,P<0.01)。VPDL条件下,考虑滞后时间后,无论是否划分失水期和复水期,不同分化等级红锥TWD与VPD之间的相关性均增强。VPDs条件下,复水期的相关性低于忽略时滞效应时的相关性。【结论】TWD对VPD的响应存在时滞效应,在失水期和复水期,TWD对VPD的响应特征不同,且在不同分化等级间存在差异;失水期和复水期的划分有助于研究TWD与VPD的相关性。
【Objective】Tree water deficit-induced stem shrinkage(TWD)is an indicator for tree water status.By studying the variation characteristics of TWD and its relationship with VPD,and revealing the response characteristics of radial change to environmental water stress,the scientific basis and data support for reasonable guidance of Castanopsis hystrix plantation management was provided.【Method】Dendrometer was used to continuously record the radial growth change process of C.hystrix,and the environmental factors were measured simultaneously.The main goal of this study was to analyze the response characteristics of TWD to VPD.【Result】The TWD fluctuation trend of different differentiation classes was similar,and TWD varied with VPD,but not synchronously.On the hourly scale,TWD and VPD were significantly positively correlated(r=0.488,r=0.489,r=0.512,P<0.01),and TWD and VPD were also significantly positively correlated after the water loss period and water recover period were divided.The correlation of water loss period was enhanced(r=0.623,r=0.667,r=0.593,P<0.01).On the daily scale,no matter whether water loss period and water recovery period were divided,the two were significantly positively correlated,but the correlation was weakened.The results of comparison of pearson’s correlation coefficients between TWD and VPD under the condition of considering the time delay effect within 1-day showed that TWD and VPD were significantly positively correlated(P<0.01)regardless of differentiation classes.After dividing the water loss period and the water recovery period,the correlation of the water loss period was stronger than that of the water recovery period.When the water loss period and the water recovery period were not divided,the variation of TWD lagged behind that of VPD to a certain extent,by about 3 h.After the water loss period and the water recovery period were divided,the time lag of TWD to VPD in the water loss period was shortened,and time lag of TWD to VPD in the water recovery period was lengthened.The time lag of dominant,intermediate,and suppressed trees during water recovery period was 3 h,4 h and 5 h,respectively,longer than that during the water loss period.Under VPD large fluctuation condition(VPD_(L)),with repeatedly rising and falling of VPD,TWD appeared as water loss and recovery alternately.Under VPD small fluctuation condition(VPDs),TWD changed slowly.The time lag of TWD to VPD was existed under both conditions.The correlation between TWD and VPD under VPDL was stronger(r=0.550,r=0.553,r=0.584,P<0.01)than that under VPDs(r=0.256,r=0.260,r=0.281,P<0.01),regardless of differentiation classes.Under VPD_(L),after considering the time lag,the correlation between TWD and VPD of different differentiation classes was enhanced regardless of whether the water loss period and the water recovery period were divided.Under VPDs,the correlation of water recovery period was lower than that when the time lag effect was ignored.【Conclusion】TWD has a time-lag effect in response to VPD.TWD has different response characteristics to VPD in the water loss period and water recovery period,and these relationships have differences among different tree differentiation classes.The division of water loss period and water recovery period is helpful to study the correlation between TWD and VPD.