Posts

CONTINUE READING

这里以一个湿地物种组成的数据为例来看物种组成和环境条件之间的关系。数据包含植物组成和湿地水环境化学组成。 library(vegan) ## Loading required package: permute ## Loading required package: lattice ## This is vegan 2.4-4 chem <-

CONTINUE READING

主成分分析是线性非限制性排序方法。主成分分析的轴是基于特征值(变量解释程度)而排序的。 主成分分析相关function简介: \(\color{red}{\text{rda()}}\) 源于vegan包

CONTINUE READING

引子 什么是排序?为啥要排序?咋排? 群落学数据一般是多维数据,例如群落中物种组成。某一个物种在某一个群落中的多度作为变量,其在不同群落中多度的

CONTINUE READING

1 RDA

2 PCA

3 NMDS:

CONTINUE READING

Tomato plants can detect an imminent animal attack Sunny day at the garden, Lady plant tomato is busy with eating the CO2 in the atmosphere but did not pay much attention to the Mr. Snail is getting close. However, there is already a signal transfer from the soil to the Lady plant tomato and calling: the snail is coming, even before any touched occurs from the snail! This story comes from a recently published paper ( Oecologia) from ecologist John Orrock of the University of Wisconsin–Madison.

CONTINUE READING

Useful notes about markdown

CONTINUE READING