食物链的一种计数法

A COUNTING METHOD ON FOOD CHAINS

群落食物网常用有向图直观表示，食物网映射矩阵的引入给出了食物网的一种代数表示，本文通过食物网映射矩阵的乘法运算给出了食物网中，物种ｉ到物种ｊ的ｋ级食物链个数的简单计数法。它尤其适合复杂食物网中食物链的计数，是用矩阵方法进行食物链研究的一个先例，具有重要的方法论意义。

The community food webs are usually represented in vector graph.Another algebraic representation is given by the food web mapping matrix.In this paper,Using the matrix multiplication,we gives a simple counting method on the number of k grade food chains from species i to species j in a food web.The counting method is very effective applied to a complex food web.