Scale Expansion of Community Investigations and Integration of the Effects of Abiotic and Biotic Processes on Maintenance of Species Diversity

Table 4

The respective regression of species pool effect, 𝑙𝑛𝑌, from Yunnan flora region pool to flora subregion pools, on land area, climate, vegetation, and landform diversity in these subregion species pools, the multivariable regression, and HE.

Process impacting filter	Regression model^a	𝑛	𝑅^2	𝐹-value	𝑃 value
Land area (𝑥1, km^2)	𝑦=−0.147ln(𝑥1)+9.515	11	0.428	6.726	0.029
Climatic diversity (𝑥2)	𝑦=−0.344ln(x2)+9.389,	11	0.861	55.554	0.000
Vegetation diversity (𝑥3)	𝑦=−0.326ln(𝑥3)+9.887	11	0.522	9.841	0.012
Landform diversity (𝑥4)	𝑦=−0.215𝑥4+9.312	11	0.156	1.659	0.230
𝑥1, 𝑥2, 𝑥3	𝑦=9.549−0.002𝑥1−0.120𝑥2−0.004𝑥3	11	0.893	19.406	0.001

^a𝑦=ln𝑌, 𝑥 = process impacting filter. Climatic diversity, vegetation diversity, and landform diversity are indicated by the number of each type of climate, vegetation, and landform in an expanded community, that is, flora subregion. In multivariable regression model, landform diversity was excluded due to low 𝑅². HE (%) = (1 − 0.893) × 100 = 10.70.