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本文以海南岛甘什岭6种天然棕榈藤为研究对象,采用除趋势对应分析(DCA)与冗余分析(RDA)筛选了棕榈藤种群分布的主要生境因子,探究了种群密度随主要环境因子梯度的变化规律。结果表明:杖藤(Calamus rhabdocladus)和大白藤(C.faberii)种群密度最大,黄藤(Daemonorops jenkinsiana)和白藤(C.tetradactylus)次之,小钩叶藤(Plectocomia microstachys)和单叶省藤(C.simplicifolius)种群密度最小;影响棕榈藤分布的条件作用因子为5种,影响大小为全P>坡位>全N>坡形>岩石裸露率,排序轴中第一轴解释33.5%物种-生境相关性信息,4轴共解释73.7%的相关性信息;棕榈藤在5种生境梯度下呈现一定的差异性,白藤适宜于全P含量相对较高且岩石裸露率低的下位斜坡;大白藤适宜N、P含量相对较少且岩石裸露率低的中上位地段;单叶省藤适宜于N、P偏低的中位凹地,杖藤适宜于土壤全P和岩石裸露率低的凹地;黄藤适宜于全P偏低的岩石裸露偏高的中上位凹地;小钩叶藤幼苗适宜于N、P含量偏高的斜坡。综上所述,杖藤和黄藤对该地区生境的适应能力最强,全P、坡位、坡形、全N和岩石裸露率是影响该地区棕榈藤种群分布的主要因素,6种棕榈藤对生境响应不同,且幼苗期棕榈藤对生境的响应较其他生长期有明显差异。在棕榈藤天然更新资源保护和恢复过程中,针对不同种类和生长阶段采取相应措施有利于藤资源保存。
In this paper, six kinds of natural palm rattan (Brassica napus L.) in Hainan Island were studied. The main habitat factors of the population distribution of rattan (Brassica rapa) were screened by using DCA and RDA, and the relationship between population density and major environmental factors Gradient variation. The results showed that the population density of Calamus rhabdocladus and C.faberii was the largest, followed by the leaves of Daemonorops jenkinsiana and C.tetradactylus, Plectocomia microstachys, (C. simplicifolius) had the lowest population density. There were five conditions influencing the distribution of the rattan rattan in the order of P> Slope> N> Slope> bare rock. The first axis of the order axis explained 33.5% of the species - Habitat correlation information, 73.7% correlation information was explained by 4 axes; The rattan rattan showed certain difference under five kinds of habitat gradients, White rattan suitable for the lower ramps with relatively high total P content and low rock bareness; Large White rattan suitable for N, P content is relatively small and the rock bare low middle; Lotou rattan suitable for N, P low depression, cane is suitable for soil P and rock bare low depression; The yellow cane is suitable for the upper-middle depression where the whole p-low rock is exposed, and the small hooked cane vine is suitable for the slopes with high N and P contents. In summary, cane and yellow cane had the strongest adaptability to the habitats in the area. The total P, slope position, slope shape, total N and rock bareness rate were the main factors influencing the distribution of palm cane population in the area. The responses to habitats were different, and the responses of P. rapae seedlings to habitats were significantly different from those of other growth stages. In the natural regeneration of palm rattan resources protection and recovery process, for different types and stages of growth to take appropriate measures conducive to preservation of rattan resources.