Radom Forest Model Analysis on Environment Factors of Phyllotreta striolata Occurrence in Brassica chinensis Field
The data of arthropod communities,plant center microclimate and plant canopy were surveyed on 10 samples in a 2 000 m2 field of Brassica chinensis with LAI-2000 plant canopy analyzer.On the basis of a primary CCA analysis to the related factors of this survey,a random forest model between the Phyllotreta striolata occurrence data and environment factors was established using R software.Moreover the ordinary analysis of these environment factors about Phyllotreta striolata occurring was carried out by this model.The result of random forest model analysis showed that there was an evident relationship between Phyllotreta striolata occurrence and microclimate information and corresponding distribution information of various arthropod.Furthermore MSR of this model's 9 independent variables was only 19.698 22.In addition the most important environment factors affecting this pest occurrence were temperature and RH％ of leaf center,LA1 and MTA of every leaf blade.The cumulative percentage of PCA Eigen value about these environment factors plus the natural enemy factor of Propylea japonica was 91.474 5％.In conclusion the distribution of Phyllotreta striolata at Brassica chinensis plant was restricted by the values of temperature and RH％ of leaf center,the shading degree of leaf blades brought by outdoor wind velocity,temperature and plant growth vigour.Therefore the influence of weather factors and crop growth indexes to Phyllotreta striolata distribution should be paid more attention in the comprehensive control and management of this insect.
Brassica chinensisPhyllotreta striolatarandom forest model
国家科技期刊平台
NSTL
万方数据
维普
