摘要
【目的】树木茎干木质部生长动态被认为是对环境变化敏感的指标之一,因此明确木质部年内形成过程对于阐明树木与气候的关系具有重要意义。【方法】利用微树芯技术,对茎干周期性采样(7~10 d),通过切片观察河南洛阳市4种环孔材树种楸树Catalpa bungei、樟树Cinnamomum camphora、白蜡Fraxinus chinensis和栾树Koelreuteria paniculata的木质部年内径向生长动态,并利用Gompertz模型对测量的木质部径向生长累积量进行拟合。【结果】①4个树种形成层活动时间集中在3月上旬至10中旬,其中楸树最短,为(189.0±14.6)d,樟树最长,为(216.0±17.4)d。②4个树种木质部形成动态相似,均呈S型生长曲线,在11月初完成径向生长,最大生长速率出现在5月中旬。但不同树种的年内径向生长量差异较大,其中白蜡最短,为(5807.0±2192.9)μm,楸树最长,为(8276.0±1744.2)μm。③气温可能是影响本地区树木径向生长的主要气候因子,气温和地表温度与树木径向生长均呈极显著正相关(P<0.01)。降水量只与樟树生长呈显著正相关(P<0.05),这可能是因为樟树的导管直径与导管面积均最小,对水分条件较敏感。【结论】洛阳市4个树种的径向生长都与气温呈极显著正相关,并且半环孔材樟树对气候因子的响应要强于其他3个环孔材树种。
[Objective]The radial growth dynamics of xylem is considered one of the indicators of sensitivity to environmental change.Investigating the xylem formation is crucial to elucidate the relationship between trees growth and the climate.[Method]Microcore sampling and paraffin sections technology were used to monitor the intra-annual growth dynamics of xylem formation.We collected the microcores of Catalpa bungei,Cinnamomum camphora,Fraxinus chinensis and Koelreuteria paniculata every 7−10 d,and Gompertz model was used to fit the modeled value of cumulative radial growth.[Result](1)Cambial activity began in early March and ended in mid-October.The duration of cambial activity was shortest for C.bungei[(189.0±14.6)d],and longest for C.camphora[(216.0±17.4)d].(2)Four species finished the xylem differentiation in early November,and their maximum growth rate occurred in the middle of May.However,the widths of cumulative radial growth showed great variations among four ring-porous species which were from(5807.0±2192.9)μm for F.chinensis to(8276.0±1744.2)μm for C.bungei.(3)Additionally,temperature may be the main climatic factor influence the radial growth in study area.Both air temperature and surface ground temperature had a significantly positive correlation on the xylem growth increment for four ring-porous wood species(P<0.01).The positive correlation between precipitation and xylem growth was only in C.camphora(P<0.05).It may explained by the smallest diameter and area of vessel of C.camphora,which led to the trees were more sensitive to precipitation.[Conclusion]The radial growth of the four tree species in the local area is highly significantly positively correlated with air temperature.The response of the C.camphora plants to climatic factors is stronger than the other three ring-porous porous tree species.
作者
徐军亮
候佳玉
毋彤
翟乐鑫
罗鹏飞
卫苗
章异平
XU Junliang;HOU Jiayu;WU Tong;ZHAI Lexin;LUO Pengfei;WEI Miao;ZHANG Yiping(College of Horticulture and Plant Protection,Henan University of Science and Technology,Luoyang 471000,Henan,China)
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2024年第6期1105-1113,共9页
Journal of Zhejiang A&F University
基金
国家自然科学基金资助项目(42271057,41401063)
国家留学基金资助项目(201808410575,201908410061)
大学生科研训练计划项目(2022508)
河南省留学人员科研择优资助项目(2024020)。
