摘要
揭示河北省生长季臭椿径向变化特征及驱动因子,对提高该地区林木不同时期水分利用效率和林木合理经营具有重要意义。利用树干径向变化记录仪连续监测臭椿生长季树干直径变化动态,同步监测树干液流与小气象因子,研究月尺度、日尺度臭椿树干直径的变化特征,分析其与树干液流及小气象因子的协同变化关系。结果表明:(1)5—9月臭椿树干直径的增长量为3246.856μm,生长主要集中在5月初至7月中旬,树干直径的日变化呈现周期性收缩与膨胀的变化规律,日最大变化量范围为6月>5月>7月>8月>9月;(2)树干直径变化与树干液流呈现负相关关系(P<0.01),且滞后于树干液流变化;(3)树干直径变化与太阳辐射、空气温湿度和饱和水汽压差呈显著相关关系(P<0.01),也存在时滞效应;(4)在降雨天气下,树干直径的日变化幅度小,但雨天后树干直径明显增加。生长季臭椿不同月份树干直径增长量和变化特征存在差异,树干液流、气象因子和降雨是树干直径变化的主要驱动因子。
[Background]The study of the relationship between tree growth and environmental factors is important to improve the water use efficiency of forest trees and the rational management of forest trees.Previous studies have mostly focused on the relationship between tree whorl and climate,which lacks continuity and completeness of observation.A stem radial change recorder can continuously record stem diameter growth and reversible moisture-related shrinkage and swelling within the stem,providing information on the tree s moisture relationships and stem diameter growth.[Methods]The Ailanthus altissima in Hebei was used as the experimental object,and the dynamic variations of stem diameter during the growing season(May 2021 to September 2021)of A.altissima was continuously monitored by means of a radial change recorder,and the sap flow and micrometeorological factors were simultaneously monitored,and the synergistic relationships between stem diameter and sap flow and micrometeorological factors were analyzed by correlation analysis method.[Results](1)The stem diameter of A.altissima increased by 3246.856μm from May to September,and the maximum diurnal variation range presented as June>May>July>August>September,the growth mainly concentrated from early May to mid-July.The diurnal variation of stem diameter showed the regular pattern of periodic contraction and expansion.(2)The variation of stem diameter and sap flow showed a negative correlation(P<0.01),and the variation of stem diameter lagged behind the sap flow for 150,120,90,30,and 30 min from May to September,respectively.(3)The variation of stem diameter also showed a negative correlation with solar radiation,air temperature and vapor pressure deficit,and a positive correlation with air humidity(P<0.01),and there was also time lag.The change in stem diameter lagged behind the change in solar radiation and ahead of the change in vapor pressure deficit.The time lags between stem diameter and each meteorological factor tended to increase as the month progressed.(4)U
作者
刘云洁
郭聪聪
姚丽芳
马长明
LIU Yunjie;GUO Congcong;YAO Lifang;MA Changming(School of Forestry,Hebei Agricultural University,071000,Baoding,Hebei,China;Hebei Provincial General Forestry and Grassland Technology Promotion Station,050000,Shijiazhuang,China;Hebei Mulan Weichang State-owned Forestry Field,067000,Chengde,Hebei,China)
出处
《中国水土保持科学》
CSCD
北大核心
2023年第4期53-59,共7页
Science of Soil and Water Conservation
基金
河北省乡村振兴技术创新专项“雄安新区上游太行山区典型退化林分修复技术研究”(22326806D)。
关键词
臭椿
树干直径变化
树干液流
环境因子
时滞
Ailanthus altissima
stem diameter variation
stem sap flow
environmental factors
time lag
