阳山洞冠梨水分利用特征及其对气象因子的响应  

Water Utilization Characteristics of Yangshan Pyrus communis and Its Response to Meteorological Factors

作　　者：欧阳余旋 史怀豫 谭宇萍 Ouyang Yuxuan;Shi Huaiyu;Tan Yuping(Maoming State-owned Houyuan Forest Farm,Maoming 525000,China)

机构地区：[1]茂名市国有厚元林场,广东茂名525000

出　　处：《防护林科技》2023年第5期33-36,57,共5页Protection Forest Science and Technology

摘　　要：为探明广东省阳山洞冠梨水分利用特征,利用热扩散探针式茎流仪连续测定其液流变化,同时结合气候因子,探究其液流变化与气候因子的相关性和响应规律。结果表明:洞冠梨树干液流变化具有明显昼(2.28~19.91 cm 3·cm^(-2)·min^(-1))夜(0~5.36cm 3·cm^(-2)·min^(-1))差异,生长季内晴天液流变化趋势大体呈双峰型,不同季节其液流变化趋势、峰值、启动时间有所差异。生长季内洞冠梨液流密度逐渐增加,在4月(8.36 cm 3·cm^(-2)·min^(-1))达到峰值后缓慢减少,其液流变化明显受到树木生长状况影响。洞冠梨液流与水汽压亏缺(V_(PD))、太阳辐射(R_(s))、大气温度(T_(a))呈极显著正相关(r分别为0.677、0.525和0.295),与空气相对湿度(R_(H))、日降雨总量(P)呈极显著负相关(r分别为-0.635和0.302),与风速(W)呈显著正相关(r=0.179),各气象因子间也具有较强的自相关性。影响洞冠梨树干液流变化的不是单一气象因子作用,而是多因子共同作用。冠梨树干液流对各气象因子的响应存在差异,且伴有时滞效应,时滞程度受树龄、季节、物候期等因素的影响。In order to explore the water utilization characteristics of Yangshan Pyrus communis in Guangdong Province,the stem flow meter of thermal diffusion probe type was used to continuously measure the liquid flow changes,and to explore the correlation and response law of the liquid flow change and climate factors combined with meteorological factors.The results showed as follows:there was significant difference between days(2.28-19.91 cm 3·cm^(-2)·min^(-1))and nights(0-5.36 cm^(3)·cm^(-2)·min^(-1))in liquid flow changes of Pyrus communis trunk;the trend of liquid flow in sunny days during the growing season was generally bimodal,and the variation trend,peak value and start time were different in different seasons.During the growing season,the flow density of Pyrus communis increased gradually and slowly decreased after the peak in April(8.36 cm 3·cm^(-2)·min^(-1)),and the liquid flow change was obviously affected by the growth of trees.The liquid flow of Pyrus communis had a significant positive correlation with water vapor pressure loss(V_(PD)),solar radiation(R s)and atmospheric temperature(T_(a))(r=0.677,0.525 and 0.295,respectively),a significant negative correlation with air relative humidity(R H)and total daily rainfall(P)(r=-0.635 and-0.302,respectively),a significant positive correlation with wind speed(W)(r=0.179),and strong autocorrelation among meteorological factors.It is not a single meteorological factor that affects liquid flow changes of Pyrus communis trunk,but multiple factors that function together.The response of liquid flow of Pyrus communis to various meteorological factors is different,accompanied by time delay effect,which is influenced by tree age,season and phenological period.

关 键 词：阳山洞冠梨 液流 气象因子 

分 类 号：S759.3[农业科学—森林经理学]