红壳竹与美竹的空间竞争关系研究  

Spatial Competitive Relationship Between Phyllostachys iridescens and Phyllostachys mannii

作　　者：郑轶文 戴长志 苏小飞 张鑫 周默言 时培建 ZHENG Yi-wen;DAI Chang-zhi;SU Xiao-fei;ZHANG Xin;ZHOU Mo-yan;SHI Pei-jian(Bamboo Research Institute,College of Science,Nanjing Forestry University,Nanjing Jiangsu 210037,P.R.China)

机构地区：[1]南京林业大学理学院竹类研究所,江苏南京210037

出　　处：《西部林业科学》2022年第4期54-61,共8页Journal of West China Forestry Science

基　　金：国家自然科学基金青年基金项目(31400348)。

摘　　要：分布在同一区域亲缘关系较近的植物往往存在空间竞争,为了减少竞争的激烈程度,植物可以通过空间生态位分化以实现共存。以红壳竹和美竹为研究对象,计算特定类型概率的核估计式和执行蒙特-卡罗模拟来检验两种竹子是否存在空间生态位分离,并使用交互类型K函数对其空间关联性进行分析,选用幂函数和beta sigmoid函数分别描述红壳竹与美竹出笋量和时间的关系。结果显示:两种竹子新笋在空间分布上存在显著的隔离,且在给定的空间尺度上(0.2~0.5 m)呈现空间互斥关系。在调查的时间内,红壳竹竹笋呈幂函数增长模式,而美竹竹笋则呈受抑制性的sigmoid增长模式。根据研究结果预测,在给定的研究区域内美竹很可能会排挤掉,红壳竹成为单一优势物种。There usually exists the spatial competition between the two species of plants that are closely related in taxon.To reduce the extent of competition,the plants can coexist in a certain period by spatial niche differentiation.The spatial distributions of the two species of bamboo plants(Phyllostachys iridescens and Phyllostachys mannii)at the Nanjing Forestry University campus were investigated to examine whether the two closely related species exhibit a spatial segregation.The type-specific probabilities for the two species were calculated by a kernel estimation method and the Monte-Carlo simulation was also used to test the significance of the spatial segregation.The spatial correlation between the two species was explored by using the cross-type K function.We used the exponential and beta sigmoid functions to describe the number of shoots versus time relationship for P.iridescens and P.mannii,respectively.The results showed that there is a significant spatial segregation between the two bamboo species,and there is a spatial repulsion between the two species of shoots.The exponential function fit the shooting number vs.time data of P.iridescens well,whereas the beta sigmoid function fit the number of shoots vs.time data of P.mannii well,which shows a resource-constrained growth pattern.From a long-term prediction,P.iridescens tends to exclude P.mannii in the current study region because of a stronger competitive ability.

关 键 词：红壳竹 美竹 交互类型的K函数 蒙特-卡罗检验 生态位分化 特定类型概率 

分 类 号：S795[农业科学—林木遗传育种] S718.5[农业科学—林学]