Dominant factors
Any organisms cannot live without its biotic and abiotic elements
around. Their distribution range was determined with many factors, such
as climate, soil, topography, biology, history, human activity and so
on. A. annua was no exception. In our study, 19 bioclimatic
factors and altitude were prepared for distribution modeling. After
analyzing their correlations between each other, seven variables were
considered to build species distribution models for A. annua . Due
to their different basic theories and emphases, the same factors behaved
diversely. But BIO9 (mean temperature of driest quarter) occupied the
leading position in every models. This bioclimatic variable played an
important role in shaping the distribution of A. annua.