参考文献是为撰写或编辑论文和著作而引用的有关文献信息资源 m是专著 j是期刊 c是会议论文 d是学位论文 p是专利 s是标准 db是数据库 ol是指联机网络 db/ol是联机网上数据库. Pielou的计算方法是 j = \frac {h} {ln (s)} h：就是上面计算的shannon指数 s：生态群落的物种丰富度（the total number of species） j (a) = 1;
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