基于MaxEnt模型的橡胶林下金花茶套种适宜区研究OA北大核心CSTPCD

To evaluate and select the suitable areas for Camellia chrysantha intercropping under rubber plantations in China,the generalized additive model(GAM),random forest model,and maximum entropy model(MaxEnt)were applied to simulate the potential suitable areas based on the historical distribution records of C.chrysantha and environmental data.By comparing with the existing distribution records of C.chrysantha,the area under curve(AUC)of the receiver operating characteristic curve(ROC),and the Kappa coefficient,the best models were selected.Then,by using image processing techniques and combi-ning the rubber plantation areas with the best model simulation results,potential planting areas for C.chrysantha under rubber forests in Yunnan,Guangdong,and Hainan provinces were ultimately obtained.The results showed that the MaxEnt model had a high overlap with the distribution records of C.chrysan-tha in China,and the area under the ROC curve(AUC)was greater than 0.9,with a Kappa coefficient greater than 0.8,which demonstrated that the prediction results of MaxEnt model were reliable.The main factors influencing the potential suitable distribution of C.chrysantha were mean annual temperature,ac-cumulated temperature,humidity during the driest season,and humidity index.The highly suitable zone of C.chrysantha under rubber forest was mainly distributed in Danzhou and Baisha County in Hainan Prov-ince,Gaozhou City in Guangdong Province,Mengla County and Hekou County in Yunnan Province.Among them,the areas with high suitability in Hainan,Guangdong and Yunnan Province were 209 200 hm2,25 900 hm2 and 151 100 hm2,respectively.The areas with medium suitability in Hainan,Guangdong and Yunnan were 257 100 hm2,11 300 hm2 and 237 800 hm2,respectively,which mainly distributed in Danzhou City,Gaozhou City and Jinghong City.The areas with low suitability took up a small proportion and were mainly distributed in Qionghai City and Wanning City in the east of Hainan Province and Gengma County and Cangyuan County in Yunnan,covering an area of 37 400 hm2 and 128 600 hm2 respectively.Through this study,the suitable areas and development potential of C.chrysantha intercropping under rubber forests are preliminarily indentified,which provide a basis for C.chrysantha intercropping under rubber forests,and also provide a new method for the screening of understory intercropping crops.