宽窄行栽植下毛白杨不同方位树干液流的差异  

Azimuthal variation in sap flux density of Populus tomentosa under wide and narrow row planting scheme

作　　者：刘洋[1] 王烨 王斐 邸楠[1] 李全明 于凌霄 邓坦 于召斌 席本野[1] 李广德[6] 贾黎明[1] LIU Yang;WANG Ye;WANG Fei;DI Nan;LI Quanming;YU Lingxiao;DENG Tan;YU Zhaobin;XI Benye;LI Guangde;JIA Liming(Ministry of Education Key Laboratory of Silviculture and Conservation,Beijing Forestry University,Beijing 100083,China;Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration,Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China;Liaocheng Forestry Bureau,Liaocheng 252000,Shandong,China;Daxing forestry station,Beijing 102600,China;Henan Provincial Institute of Forest Inventory and Planning,Zhengzhou 450045,Henan,China;Faculty of Agriculture,Forestry and Medicine,The Open University of China,Beijing 100039,China)

机构地区：[1]北京林业大学省部共建森林培育与保护教育部重点实验室,北京100083 [2]中国林业科学研究院林业研究所国家林业局林木培育重点实验室,北京100091 [3]聊城市林业局,山东聊城252000 [4]北京市大兴林业工作站,北京102600 [5]河南省林业调查规划院,河南郑州450045 [6]国家开放大学农林医药教学部,北京100039

出　　处：《中南林业科技大学学报》2018年第10期95-105,共11页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(31670625;31400532);国家重点研发计划课题(2016YFD0600403);"十二五"国家科技支撑计划资助(2015BAD09B02)

摘　　要：毛白杨Populus tomentosa是我国北方主要速生用材树种,在华北地区多采用宽窄行模式栽植。该模式下,不均匀的生长空间可能会引起不同方位树干液流速率(F_d)的差异,从而影响对林木蒸腾耗水的准确估计。为探究宽窄行栽植下毛白杨不同方位F_d的变异特征及其与气象因子的变化关系,采用热扩散式液流探针和自动气象站,对9株不同胸径样树4个方位(东、南、西、北)的F_d及林地气象因子进行监测和分析。结果表明:所有样树不同方位的F_d均具有显著差异,平均变异系数(CV)为15.1%±9.2%。其中,西方位为优势方位,其F_d显著大于或与其他方位无差异,而其它三个方位F_d大小次序无明显规律。各方位F_d在不同气象条件下均具有相同的日变化趋势,且下午(12:00—24:00)的F_d显著高于上午(0:00—12:00)。林木各方位F_d受光合有效辐射(PAR)影响强烈,多重回归分析结果表明PAR几乎为各方位F_d的主要驱动因子,而水汽压亏缺(VPD)和空气温度(T_a)仅在个别方位对F_d具有一定驱动作用。不同方位F_d的CV和相对偏差(RD)与PAR、VPD不具有显著相关关系,表明F_d的方位差异并未受气象因子影响。综上,在研究宽窄行栽植模式下林木蒸腾耗水时,方位间F_d差异不能忽视;在液流探针数量有限的情况下,对每株样树随机选取一个方位进行F_d测定可能会获得更精确的林木蒸腾量估计。As one of the main fast-growing tree species in northern China,Populus tomentosa is widely planted using wide and narrow row planting scheme in North China.Under this planting scheme,the uneven growth space may cause differences in the sap flux density(Fd)in different directions of the trunk,which subsequently affects the accurate estimation of the stand transpiration.Our study aimed to investigate the characteristics of Fd values in different directions and their relationship with meteorological factors in a P.tomentosa plantation under the wide and narrow row planting scheme.The Fd in four directions(east,south,west,north)of 9 sample trees with different diameters were monitored using a set of thermal dissipation probes,and the stand meteorological factors were measured by a automatic weather station.The results showed that Fd in different directions had significant differences for all sample trees,and the mean coefficient of variation(CV)of azimuthal Fd was 15.1%±9.2%.West has the highest Fd value,which was significantly greater or had no difference with Fd in other directions,while the order of Fd in other three directions had no obvious regularity.The azimuthal Fd had the similar daily variation under different weather conditions,and the mean Fd in the afternoon(12:00-24:00)is significantly higher than that in the morning(0:00-12:00).Fd was strongly affected by photosynthetically active radiation(PAR)in all directions.Multiple regression analysis results showed that PAR was almost the main driving factor for Fd in all directions,while vapor pressure deficit(VPD)and air temperature(Ta)only affected in several directions.There was no significant correlation between CV,relative deviation(RD)of azimuthal Fd and PAR,VPD.This indicated that the azimuthal variation of Fd was not influenced by meteorological factors.Therefore,the azimuthal variation of Fd should not be neglected when estimating the stand transpiration under the wide and narrow row planting scheme.And randomly selecting one direction of each sample

关 键 词：液流速率 方位差异 宽窄行 毛白杨 

分 类 号：S792.117[农业科学—林木遗传育种]