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niche theory
相关语句
  生态位理论
    APPLICATION OF THE ECOLOGICAL NICHE THEORY IN THE AGRICULTURAL DEVELOPMENT OF SANDY LAND
    生态位理论在沙地农业开发中的应用
短句来源
    The Relative Change in the Quantity of Cultivated Land Based on Niche Theory——A Case Study of Jiaozuo City
    基于生态位理论的耕地数量相对变化研究——以焦作市为例
短句来源
    Based on the review on the development processes of ecological niche theory and itsapplication in the establishmen t of ecological agriculture of China,the paper deals with the appllcationof ecological niche theory in the agricultural development of sandy land.
    在回顾生态位理论的产生、发展及其在我国生态农业建设中的应用基础上,总结了生态位理论在沙地农业开发中的应用。
短句来源
    This paper proposes the concepts of cultivated land ecounit and cultivated land niche,then expounds its chatacter and development law based on niche theory.
    以生态位理论为基础,提出了耕地生态元和耕地生态位的概念,并对耕地生态位的特征及其演替规律作了系统阐述。
短句来源
    The concepts of cultivated land ecounit and cultivated land niche are proposed based on niche theory.
    以生态位理论为基础,提出了耕地生态元和耕地生态位的概念。
短句来源
  生态位
    APPLICATION OF THE ECOLOGICAL NICHE THEORY IN THE AGRICULTURAL DEVELOPMENT OF SANDY LAND
    生态位理论在沙地农业开发中的应用
短句来源
    The Relative Change in the Quantity of Cultivated Land Based on Niche Theory——A Case Study of Jiaozuo City
    基于生态位理论的耕地数量相对变化研究——以焦作市为例
短句来源
    Based on the review on the development processes of ecological niche theory and itsapplication in the establishmen t of ecological agriculture of China,the paper deals with the appllcationof ecological niche theory in the agricultural development of sandy land.
    在回顾生态位理论的产生、发展及其在我国生态农业建设中的应用基础上,总结了生态位理论在沙地农业开发中的应用。
短句来源
    On the basis of the niche theory and the system boundary theory,in this paper we made up the model of land-use niche and took the Xishan City,Jiangsu Province as an example to quantitatively analyze interactive intensities in different land use types.
    在生态位势理论与系统边界理论的基础上,论文构建了土地利用经济生态位的模型,并以江苏省锡山市为例定量分析了不同土地利用类型相互作用的强度。
短句来源
    This paper proposes the concepts of cultivated land ecounit and cultivated land niche,then expounds its chatacter and development law based on niche theory.
    以生态位理论为基础,提出了耕地生态元和耕地生态位的概念,并对耕地生态位的特征及其演替规律作了系统阐述。
短句来源
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  niche theory
An ecological niche theory approach to the measurement of brand competition
      
The data are consistent with the fine-grained niche theory but difficult to reconcile with bottlenecks and genetic drift.
      
In this paper GF variation is viewed along structural niche axes, and related to classical niche theory; several corollaries of the theory are examined in the light of plant GF patterns.
      
When applying niche theory to plants, the mechanisms of competition are ill-defined and the assumption of bell-shaped response curves for species unrealistic.
      
A reformulation of the continuum concept is presented after considering the implications of the community/continuum controversy and current niche theory.
      
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Based on the review on the development processes of ecological niche theory and itsapplication in the establishmen t of ecological agriculture of China,the paper deals with the appllcationof ecological niche theory in the agricultural development of sandy land.Its main ways include:introducing the new ecological element;setting up high-benefit element;developing potential ecologicalniche;and directionally changing the basic ecologicaI niche.

在回顾生态位理论的产生、发展及其在我国生态农业建设中的应用基础上,总结了生态位理论在沙地农业开发中的应用。主要途径有:引进新的生态元、组装高效生态元、开拓潜在生态位、定向改变基础生态位。

Land use change is a self-organized behavior of conversion from low niche level to high level,including two aspects of its structure and intensity.Only under the control and con-cordance with land-use niche in different levels,the balance of its resource field can be kept in certain arable land maintenance.And this balance is the precondition to keep the dynamic bal-ance maintenance of total arable land.On the basis of the niche theory and the system boundary theory,in this paper we made up the...

Land use change is a self-organized behavior of conversion from low niche level to high level,including two aspects of its structure and intensity.Only under the control and con-cordance with land-use niche in different levels,the balance of its resource field can be kept in certain arable land maintenance.And this balance is the precondition to keep the dynamic bal-ance maintenance of total arable land.On the basis of the niche theory and the system boundary theory,in this paper we made up the model of land-use niche and took the Xishan City,Jiangsu Province as an example to quantitatively analyze interactive intensities in different land use types.The study shows that the cropland loses easily because the niche difference between non-a-gricultural land and agricultural land is big and the urbanization process gets fast.At last we dis-cussed an approach to set up mechanisms of cropland conservation using the resource flow field theory.At present level,it is more significant that land use niche is as a new method in LUCC studies.

土地利用变化包括土地利用结构和土地利用强度两个方面,是土地利用类型从低生态位层次向高生态位转变的自组织行为。对不同层次的土地利用生态位进行控制与协调,才能实现一定耕地保有量下土地利用资源场的均衡。而这种均衡正是耕地总量动态平衡得以实现的前提。在生态位势理论与系统边界理论的基础上,论文构建了土地利用经济生态位的模型,并以江苏省锡山市为例定量分析了不同土地利用类型相互作用的强度。研究显示,经济发达区非农用地与农用地生态位差较大,城市化进程加快,使耕地更易损失。从资源流动的场论分析角度,探讨了建立耕地保护机制的途径和方法。在目前的水平上,把土地利用生态位作为土地利用/覆被研究中的一种新方法论更有意义。

Niche theory is an important theory of ecology.This paper proposes the concepts of cultivated land ecounit and cultivated land niche,then expounds its chatacter and development law based on niche theory.The mathematical model of cultivated land quantity niche quotient is constructed,which can measure the relative change in the quantity of cultivated land.This paper analyses the temporal-spatial-dynamic features of the relative change in the quantity of cultivated land in Jiaozuo City during 1998~2004...

Niche theory is an important theory of ecology.This paper proposes the concepts of cultivated land ecounit and cultivated land niche,then expounds its chatacter and development law based on niche theory.The mathematical model of cultivated land quantity niche quotient is constructed,which can measure the relative change in the quantity of cultivated land.This paper analyses the temporal-spatial-dynamic features of the relative change in the quantity of cultivated land in Jiaozuo City during 1998~2004 by the mathematical model of cultivated land quantity niche quotient.The results are as follows:(1) The cultivated land quantity niche quotient minishes year after year in Jiaozuo City,which indicates that the expansion-reduction-degree of cultivated land quantity niche of Jiaozuo City is less than that of Henan province.That is to say,the reduction speed in the quantity of cultivated land in Jiaozuo City is bigger than that of Henan province every year.(2) The cultivated land quantity niche quotient of every subarea in Jiaozuo City have three situations including increasing,reduction and fluctuation,which indicates that the otherness is much bigger among subareas in Jiaozuo City.

生态位理论是生态学重要的基础理论之一。以生态位理论为基础,提出了耕地生态元和耕地生态位的概念,并对耕地生态位的特征及其演替规律作了系统阐述。在此基础上,构建了用以量度区域耕地数量相对变化的数学模型———耕地数量生态位熵数学模型,并运用该模型对焦作市1998~2004年期间耕地数量的相对变化时空动态特征进行了分析。结果表明:(1)焦作市耕地数量生态位熵逐年减小,表明焦作市各年耕地数量生态位扩充压缩度均小于河南省耕地数量生态位扩充压缩度,即焦作市各年耕地数量减少速度均大于河南省耕地数量减少速度。(2)焦作各县(市、区)耕地数量生态位熵存在扩大、减少和波动3种情形,表明焦作各县(市、区)耕地数量变化差异性较大。

 
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