不同种群密度羊草生态场梯度及其变化特征  

Ecological field gradient of Anewolepidium chinense under different population densities and its dynamic characteristics

作　　者：王德利[1] 祝廷成[1] 

机构地区：[1]东北师范大学草地研究所

出　　处：《应用生态学报》1995年第1期29-33,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金

摘　　要：通过对植物个体与种群生态场定位实验研究，提出了生态场梯度的概念，并给出了植物与羊草个体生态场梯度的模型．植物生态场的场梯度是，生态场中生态势沿任意方向的变化率，记作：羊草地上部生态场（冠场）的梯度模型：羊草地下部生态场（根系场）的梯度模型：羊草生态场冠场梯度变化形式符合Ｒａｙｌｅｉｇｈ分布，在ｒ＝处有一个最大值；羊草根系生态场梯度变化形式是一种复合分布，在ｒ＝０与ｒ＝ａ处有两个最大值．羊草个体生态场梯度同羊草种群密度相关．Through a fixed case study on the ecological field of plant individuals and populations. theconcept of ecological field gradient is put forward, and the ecological field gradient modelsof plant and Anewolepidium chinense individuals are established. The variation forms ofA. chinense crown field gradient conform to the Rayleigh distribution, and there is onemaximum value at the point r=. The A. chinense root system field gradient variesin a complex distribution, and there are two maximum values at the points r=0 and r=a.The ecological field gradient of A. chinense individuals is related to its population density.

关 键 词：生态场 生态场梯度 生态势 羊草 种群密度 

分 类 号：S543.901[农业科学—作物学] S812