摘要
本研究采用野外调查和室内分析相结合的方法,研究了云南金沙江干热河谷区车桑子自然恢复种群的种群空间分布格局、种群密度、年龄结构以及车桑子的性别比例和生长速率等特征。结果表明:1车桑子种群随着树龄增加具有从聚集分布格局转变为均匀分布格局的趋势;2车桑子的年龄结构为一个金字塔形,为一个增长型种群,说明车桑子种群更新对该地区的干热气候具有较强适应性;3车桑子高生长速率和径向生长速率达到14.38和2.46 mm·a^(-1),萌蘖数达到5.37,具有速生性;4首次发现车桑子植株具有年际的性别转换现象。上述研究结果说明车桑子能够很好的适应干热河谷区的环境条件,是该地区植被恢复的优良材料。本研究还能为该地区车桑子种群的科学管理提供部分理论支撑。
In this paper,a combination of field survey and laboratory analysis methods was used,and the traits of native Dodonaea viscosa population of Yunnan Dry-Hot Valley,including spatial distribution pattern,population density,age structure,sex ratios and growth rates,et al. were studied. The results showed that（ i） along with age increasing,the spatial pattern of D. viscosa population changed from aggregated pattern into a uniform pattern,which suggested that D. viscosa individual faced a resource competition during its lifespan;（ ii） The age structure of D. viscosa population presented as a pyramid type,which suggested that D. viscosa could regenerate well under dry-hot climate;（ iii）Height growth rate and Radial growth rate of mature D. viscosa individual were 14. 38 cm · a- 1and 2. 46 mm · a- 1,average amount of sprouts per individual was 5. 37,suggested that D. viscosa could grow fast in Dry-hot Valley;（ iv） We also found a novelty that D. viscosa could finish sex reversal among annual dynamics. Our findings suggested that D. viscosa was a perfect material for vegetation restoration of Dry-hot Valleys,and it could be of important value in future management of D. viscosa population.
出处
《西南农业学报》
CSCD
北大核心
2016年第9期2234-2238,共5页
Southwest China Journal of Agricultural Sciences
基金
中国长江三峡集团公司资助项目(WDD/0225)
关键词
车桑子
种群密度
空间分布格局
性别转换
Dodonaea viscosa
Population density
Spatial distribution pattern
Sex reversal
