1) community niche overlapping
群落普遍生态位重叠
2) general overlapping
普遍重叠
1.
There was not absolutely general overlapping amo.
应用Shannon-Weaver指数和Petraitis的方法,研究了山西翅果油树群落21个优势种群的生态位宽度和生态位普遍重叠和特定重叠,结果表明:翅果油树和黄刺玫的生态位宽度最大,这主要是由于它们具有广泛的适应性。
4) niche overlap
生态位重叠
1.
But there has been no clear correlation;Artemisia annua and Aneurolepidium chinense,Artemisia mongolia and Poa annua niche overlap between high on their .
(2)黄花蒿(Artemisia annua)与羊草(Aneurolepidium chinese),蒙古蒿(Artemisia mongolia)与早熟禾(Poa annua)之间的生态位重叠最高,说明它们对空间资源的利用效率比较高,能充分的利用资源。
2.
24 communities have been carried out and the niche breadths,niche overlaps,multi-interspecies association,and pair-interspecies association of 13 populations are obtained on the investigation.
选择了其扩散区域内的24个样地进行群落学调查,测定了群落中13个种群的生态位宽度、生态位重叠、多物种间总体关联性及成对物种间联结性,结果表明:①水盾草入侵沉水植物群落13个种群中,水盾草的生态位宽度最大,金鱼藻(Ceratophyllum demersum)、黑藻(Hydrilla verticillata)和苦草(Vallisneria natans)次之。
3.
In this paper,plant niche breadth and niche overlap were analyzed on oasis-desert ecotone in Fukang of Xinjiang,with 7 measurements.
对于生态位宽度和生态位重叠已有多种计测公式 ,这些公式的生态学合理性和应用上的可操作性 ,一直是生态学家关注的问题[1,7,9] 。
5) niche overlaps
生态位重叠
1.
The niche breadth,niche overlaps and niche similarity of 10 main trees species in the Mt.
以Levins和Shannon-Wiener生态位宽度和Pianka重叠指数对甘肃小陇山锐齿栎林的10个主要种群生态位宽度和生态位重叠及生态相似性进行了研究,分析了生态位宽度和生态位重叠的关系,揭示了各种群在群落中的功能地位及其生态适应性。
2.
The niche breadth,and niche overlaps of 10 main trees species in the Mountain Xiaolong in Gansu were measured using the formula proposed by Levins,Shannon-Wiener and Pianka.
以Levins和Shannon-Wiener生态位宽度及Pianka重叠指数为依据,将土壤有机质、土壤pH值、土壤全N分别作为反映各主要种群生长环境的资源轴,对小陇山锐齿栎林的10个主要种群生态位宽度和生态位重叠进行了研究。
3.
The niche characteristics of 17 dominant species of plant communities in Tianlong Mountains were analyzed, including the 40 quadrats were divided into 6 types of commnities by TWINSPAN,and the niche breadths and niche overlaps of main dominant species in the communities in Tianlong Mountains were measured by using Levins,Shannon-Wiener and Petraits s methods.
对天龙山植被的17个优势种群生态位进行了研究,首先用TWINSPAN与传统群落的分析方法,把40个样方分为6个群落类型,用Levins和Shannon-wiener生态位宽度和Petraitis生态位特定重叠指数测定群落中优势种群生态位宽度和生态位重叠,并分析其生态学意义。
6) niche overlapping
生态位重叠
1.
In order to find the vegetable niche pattern in arid and semi-arid grassland region,the niche breadth and niche overlapping in three different measures in Yanchi county of Nixia are measured by means of Levins niche breadth and Pianka niche overlapping indexes of enclosed grassland.
为了解干旱半干旱区草原植物生态位格局,运用Levins生态宽度指数及Pianka生态位重叠指数,对宁夏盐池人工封育草原3种不同措施下的植物生态位宽度及生态位重叠进行计量。
2.
Based on the niche theory,the manifestations of the niche overlapping in Balariver rural tourist area,southeast Guizhou Miao and Dong Autonomous Prefecture,were discussed.
在此理论基础上具体探讨黔东南苗族侗族自治州巴拉河乡村旅游区发展中存在的旅游地生态位重叠现象的主要表现,并针对由于生态位重叠而引发的恶性竞争问题提出促使巴拉河乡村旅游区协调发展的战略性建议。
3.
The niche breadth and niche overlapping in desertgrassland region fenced in Yanchi County,Ningxia Hui Autonomous Region were measured in 2002 and 2003 by mean of using Levins(1968) niche breadth and Pianka niche overlapping indexes.
运用Levins生态宽度指数及Pianka生态位重叠指数对宁夏盐池荒漠草原人工封育区2002年及2003年生态位宽度及生态位重叠进行计量。
补充资料：生态位优先假说
生态位优先假说
niche pre-emption hypothesis
生态位优先假说(niehe pre一emption hypo-thesis)以群落中物种相对重要值解释不同物种对环境资源占领情况的一种假说。相对重要值是指抽样所得某一物种的个体数、生物量或能量等值占所有物种个体数、生物量或能量总值的百分比。1965年美国惠特克(R.H.Whittaker)提出此假说。在生态位中，如垂直高度、时间分化、被捕食者的大小等都是群落中每个物种生存需要选择的特征，这许多生态位幅度(物种所能利用的环境资源幅度)特征组成了群落的n一维超维空间(h ypersPace)。每个群落的每个物种都占据了生态位超维空间中的一部分，就是物种的超体积(h ypervolume)，这些种的超体积中心都散布在生态位超维空间之内。这一假说假设生态位超维空间的大小，主要由优先占领生态位空间的某些竞争成功的物种所决定，而竞争力较弱的物种只能占领剩下来的部分。假设最重要的一个物种可能占据K部分的生态位空间，利用相应部分的群落资源，创造出相应部分的群落生产力，这个种就是群落的优势种‘见优势种)。第二个物种也能占据没有被第一个物种所占据的类似的生态位空间部分，第三个物种也占据了未被第一、二个物种所占领的相似的生态位空间部分，如此类推。由于假设每个物种的个体数与它所占领的生态位空间大小成比例(相对重要值)，故第一个物种个体数是第二个的几倍，……。则群落中各物种重要值的分布就成为一个几何级数: 吞=刀万八一K)n一‘二AC”一‘C二l一K式中”为从最重要到不重要顺序中的种的数目，C为某一物种的重要值与共同序列中前一物种重要值之比;A为群落优势种的重要值。如果用纵坐标上各个物种的个体数的对数值，与横坐标上相应物种的序列数值作图，则呈直线关系。本假说适用于环境条件较严酷，物种少、生境不重叠、优势种在个体数量或相对重要值上表现很突出的群落。 (周昌清)
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条