文献类型：期刊文献

中文题名：广西红锥人工林径向生长的季节格局及其对气候因子的响应

英文题名：Seasonal stem radial growth of Castanopsis hystrix plantation and its response to climatic factors in Guangxi,China

作者：刘士玲[1,2] 杨保国[1] 郑路[1,2] 舒韦维[1,2] 闵惠琳[1,2] 张培[1] 李华[1,2] 杨坤[1,2] 周炳江[1] 田祖为[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,广西凭祥532600;[2]广西友谊关森林生态系统国家定位观测研究站,崇左凭祥友谊关森林生态系统广西野外科学观测研究站,广西凭祥532600

年份：2024

卷号：48

期号：8

起止页码：1021-1034

中文期刊名：植物生态学报

外文期刊名：Chinese Journal of Plant Ecology

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

基金：中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2021MA002);广西壮族自治区自然科学基金(2019GXNSFBA245067)。

语种：中文

中文关键词：径向变化动态;环境响应;树木水分亏缺;径向变化记录仪;红锥;亚热带

外文关键词：radial variation dynamics;environmental response;tree water deficit;dendrometer;Castanopsis hystrix;subtropics

分类号：Q948.112

摘要：树干径向生长量(GROrate)和水分亏缺量(TWD)是树木响应环境因子的重要表征,分别受不同环境因子的影响,对环境因子的响应也不同。研究径向变化动态及其对环境因子的响应关系,对了解树木生长和生理特性应对气候变化具有重要意义。该研究利用高分辨率径向变化记录仪,连续记录2018-2020年红锥(Castanopsis hystrix)树干径向变化过程,同步监测环境因子,分析GROrate和TWD的动态变化及其与环境因子的关系。结果表明:径向生长的开始时间为3月4日至4月1日,结束时间为9月23日至11月5日,最大生长速率的出现时间为5月31日至6月8日。生长季内红锥生长呈不连续性,实际生长天数占整个生长季长度的47.8%-74.1%。生长季越长,生长发生的天数越多。日尺度上,在主要生长期(4-9月)环境因子中空气相对湿度(RH)、降水量(P)、光合有效辐射(PAR)和饱和水汽压差(VPD)与GROrate的相关性最强,而TWD的环境相关性与GROrate类似,但方向相反。21天滑动相关结果显示,在3年生长季的绝大部分时间VPD、P和RH是影响红锥径向变化的关键因素。月尺度上,GROrate与月降雨事件高度同步,而TWD与干旱期同步。因此红锥径向变化主要响应水分相关的环境因子,这将有助于更好地预测气候变化下森林动态的生长响应。
Aims Growth-induced irreversible stem expansion(GROrate)and tree water deficit-induced stem shrinkage(TWD)reflect the responding characteristics of trees to environmental change,which are affected by different factors,so that their responses to environmental factors are different.Knowledge of radial growth dynamics and its response to environmental factors is crucial for understanding the tree growth and physiological characteristics to climate change.Methods Dendrometer was used to record the radial growth process of Castanopsis hystrix from 2018 to 2020,and climatic factors were measured simultaneously.The main goal of this study was to analyze GROrate and TWD dynamics and its relationship with environmental factors.Important findings The radial growth of C.hystrix began from March 4 to April 1,ended from September 23 to November 5,and the maximum growth rates occurred from May 31 to June 8.Within the growing period,growth was intermittent,and the actual growing days accounted for 47.8%-74.1%of the whole growing season.The longer the growing period,the more days with growth occurred.On the diurnal scale,the GROrate was positively related with relative humidity(RH),precipitation(P),photosynthetically active radiation(PAR)during the main growing period(April to September).However,the negative correlation was observed between TWD and above mentioned factors.The 21-day sliding correlation showed that vapor pressure deficit(VPD),P and RH were the key factors affecting radial growth of C.hystrix in most time of the growing season from 2018 to 2020.On the monthly scale,the GROrate was highly synchronized with the monthly rainfall events,while TWD was synchronized with the dry period.Taken together,these results showed that the radial changes of C.hystrix is primarily responsive to moisture-related environmental factors.This finding will help to better predict the growth response of forest dynamics under climate change.