神农架林区华山松大小蠹危害风险分析

利用景观生态学的研究方法,以神农架林区华山松大小蠹Dendroctonus armandi为研究对象,从华山松Pinus armandii景观空间格局分析林区华山松大小蠹发生情况,并对林区各林场乡镇的风险程度进行分析。结果表明:华山松大小蠹发生与寄主华山松的面积分布占比、斑块密度呈正相关,相关系数R值分别为0.504和0.379;与华山松斑块个数、景观形状指数不相关。林区华山松面积占比最大的地区是温水林场,斑块密度最大的地区是红坪林场,因此温水林场和红坪林场华山松大小蠹危害风险最大,危害风险最低的是宋洛乡和红花朵林场。风险预测结果显示林区中部和西部的华山松斑块受侵害的风险最大。

Risk analysis of Dendroctonus armandi in Shennongjia Forestry District

The occurrence of Dendroctonus armandi and the risk level of each forest farm and town in Shennongjia Forestry District were analyzed from the landscape spatial pattern of Pinus armandii using research methods of landscape ecology.The results showed that the situation of D.armandi had positive correlation with the percentage of landscape type(PLAND)and patch density(PD)of P.armandii,with Pearson correlation coefficient R of 0.504 and 0.379,and had no correlation with number of patches(NP)and landscape shape index(LSI).The region with the biggest PLAND was Wenshui Forest Farm,and the region with the biggest PD was Hongping Forest Farm,thus the two regions had the highest risk,and the risk in Songluo Town and Honghuaduo Forest Farm were the lowest.The risk forecast results showed that P.armandii in the central and western part of Shennongjia Forestry District had the greatest possibility of being invaded.