摘要
为了研究夏季气温、土壤含水量等环境因素对桉树树干径向生长的影响,以海南省儋州的3年生桉树为研究对象,利用DD型树木径向变化记录仪对树干的径向日生长进行连续监测,同时记录土壤含水量、空气相对湿度、气温、大气水势、太阳辐射、饱和水汽压差等环境因子,分析桉树树干径向生长日变化特征对环境因子的响应.结果显示:桉树树干的径向生长呈明显的昼夜周期性变化规律,表现为白天收缩、夜间膨胀的波动过程,日最大值出现在07∶00左右,日最小值出现在16∶00左右.相关分析结果表明,桉树树干径向生长日变化与土壤含水量、空气相对湿度和大气水势呈正相关,与气温、太阳辐射、饱和水汽压差呈负相关,相关性具有高度统计学意义(P<0.01).主成分和偏相关分析结果表明,土壤含水量是影响桉树树干径向生长日变化的最主要环境因子.
In order to learn the influence of environmental factors on the diurnal variation in stem radial growth （SRG） of Eucalyptus robusta, the SRG of 3-year-old E. robusta in Danzhou of Hainan was monitored continuously by using dendrometer （ DD ）, the air temperature （Ta）, soil volumetric moisture content （ SMS ）, air relative humidity （ RH ） and atmospheric water potential （Фa）, solar radiation （TIR） and saturation vapor pressure difference （PVD）were recorded at the same time. The results showed that the SRG variation had a significant diurnal variation with daytime shrinking and nighttime swelling. The maximum value of SRG appeared at 07 ： 00, and the minimum occurred at 16 ： 00. The correlation analysis showed that the SRG was positively correlated with SMS, RH and Фa, and negatively correlated with Ta, TIR and PVD. Principal component and partial correlation analysis on environmental factors showed that the SMS was the main influential factor on SRG orE. robusta.
出处
《天津师范大学学报（自然科学版）》
CAS
2017年第6期31-36,共6页
Journal of Tianjin Normal University：Natural Science Edition
基金
国家自然科学基金资助项目(41361006
41172315)
天津市水资源与水环境重点实验室开放基金资助项目(52XS1201)
关键词
桉树
树干径向生长
日变化
环境因子
Eucalyptus robusta
stem radial growth
diurnal variation
environmental factor
