Potential Habitat of Pinus armandii in Yunnan Province Based on MaxEnt model
Based on 535 distribution points of Pinus armandii and 33 environmental variables,the maxi-mum entropy model(MaxEnt)and ArcGIS software were used to model the potential habitat of Pinus ar-mandii and the main environmental variables affecting its distribution,and the model accuracy was veri-fied by the receiver operating characteristic curve.The results showed that the AUC value of the ten-fold cross-validation of the Pinus armandii's MaxEnt model was 0.832,with a standard deviation of±0.019,indicating that the model simulated better and had a high degree of stability.The main environmental var-iables affecting the potential habitat of Pinus armandii were annual mean temperature,mean diurnal range,temperature seasonality,precipitation of warmest quarter,precipitation of coldest quarter and soil pH,among which mean annual temperature was the most important environmental variable affecting the potential distribution of Pinus armandii,with a suitable interval ranging from 6.6 to 14.8℃.The poten-tially habitat areas of Pinus armandii in Yunnan were mainly distributed in northeast Yunnan,central Yunnan and northwest Yunnan.The areas of high,medium and low habitat areas in Yunnan were 65596,40 142 and 46154 km2 respectively.The largest area of high and medium habitat was in Qujing City,the largest area of low habitat was in Deqen Prefecture,and there was no Pinus armandii habitat in Xishuangbanna Prefecture.
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