雌雄异株植物山杨的气候响应差异  

Sexual differences in climatic response of dioecious Populus davidiana tree

作　　者：高露双[1] 赵秀海[1] 王晓明[1] 张春雨[1] 

机构地区：[1]北京林业大学森林资源与生态系统过程北京市重点实验室,北京100083

出　　处：《应用生态学报》2014年第7期1863-1869,共7页Chinese Journal of Applied Ecology

基　　金："十二五"国家科技支撑计划项目(2012BAC01B03);教育部新世纪优秀人才支持计划项目(NCET-12-0781);北京林业大学青年科技启动基金项目(blx2011004)资助

摘　　要：本文通过建立长白山阔叶红松林内雌雄异株植物山杨树轮宽度序列及标准化年表,分析不同气候条件下的生长差异及其与气候因子的关系,以期揭示性别因素对植株径向生长-气候因子关系的影响.结果表明:不同气候条件下雌雄植株年径向生长速率存在显著差异,对气候因子的响应也有所不同.1980年以前,山杨雌株年均生长速率显著高于雄株,雌株与生长季末低温、上年生长季末和当年生长季降水量呈显著负相关,山杨雄株则与当年生长季温度呈显著正相关.1980年(含)以后,温度明显上升,尤其是最低温度,植株生长速率出现下降趋势,雌株生长速率显著低于雄株;雌株对低温变化更敏感,与上年生长季末低温呈显著负相关、与春季低温呈显著正相关,雄株与低温的相关关系均未达到显著水平.低温对长白山地区山杨雌株生长具有重要影响,在降水基本保持不变的条件下,低温的上升将明显抑制山杨雌株的生长,而对雄株影响不显著.The tree-ring width series and standardized chronologies of Populus davidiana trees in broad-leaved and Korean pine forest in Changbai Mountains were developed separately for male and female trees. Their differential radial growth and their relationship with climatic conditions were an- alyzed to reveal the effect of gender on radial growth and their climatic responses. It was found that there was a significant differential growth pattern before and after climate change for dioecious trees. The differential responses of the females and males to climate were also observed. The radial incre- ment of female trees before 1980 was significantly higher than that of male trees, and the growth of female was negatively related with the monthly minimum temperature at the end of current growing season and precipitation in the previous and current growing season. The male was significantly pos- itively related with the current growing season temperature. After 1980, the monthly temperature significantly increased, especially the monthly minimum temperature. The increment of dioecious trees decreased. The annual radial growth rate of the female was significantly lower than that of the male. Compared with the male tree, the female was more sensitive to the monthly minimum temper- ature. The female was significantly positively related with the spring minimum temperature and sig- nificantly negatively with the minimum temperature at the end of previous growing season. There was no significant correlation between the male and monthly minimum temperature. The monthly minimum temperature had an important impact on female P. davidiana trees in Changbai Mountains. Under the condition of stable precipitation, the increase of minimum temperature would restrain the growth of females, but lightly influenced the males＇ growth.

关 键 词：山杨 雌雄异株 生长速率 气候响应 

分 类 号：Q948[生物学—植物学]