Health evaluation of Populus euphratica forest in Dali Yabuyi Oasis in the hinterland of the desert
[Objective]The widespread degradation of Populous euphratica forests seriously threatens the ecological security of oases in arid zones.Therefore,mapping the health of P.euphratica forests is important for their sustainable management.[Method]The P.euphratica forests in Dali Yabuyi Oasis in the desert hinterland were taken as the object,and based on the field survey of 68 typical sample plots in the region,17 indexes were selected from the aspects of forest productivity,forest community structure and habitat factors,and the health evaluation index system and health evaluation model applicable to the P.euphratica forests in the region were constructed by using the principal component analysis and the cluster analysis method,the forest health indexes were calculated,and the health of the P.euphratica forests in the region was comprehensively evaluated.[Result](1)The overall forest health of oasis P.euphratica forests was poor,with 29.4％in an unhealthy state,33.8％in a medium-healthy state,30.9％in a sub-healthy state,and 5.9％in a healthy state.Groundwater burial depth,total nitrogen,depression,Simpson index,and Shannon-Wiener index were the main factors affecting forest health.(2)In the P.euphratica forests of Dali Yabuyi Oasis,the forest health index of deep groundwater burial depth is significantly lower than that of shallow and medium groundwater burial depth(P＜0.05),and the forest health level is relatively low.Shallow groundwater burial depths have relatively high levels of forest health.Overall,the forest health indices of different groundwater depths:shallow groundwater depth(0.65)＞medium groundwater depth(0.45)＞deep groundwater depth(0).(3)Among the P.euphratica forests in different regions of the oasis,the forest health index of the P.euphratica forests in the north is significantly lower than that in the center and south,and the forest health level is relatively low.Forest health is relatively high in the south.Overall,the forest health index showed an increasing trend from the north,center to the south,and the forest health index in different regions:south(0.61)＞center(0.58)＞north(-0.01).[Conclusion]The overall health level of P.euphratica forests in the oasis is poor,the shallower the water table is,the higher the health index of P.euphratica forests is,and the health index shows a decreasing trend from the south,the center to the north in different regions.[Ch,2 fig.2 tab.29 ref.]
forest health assessmentPopulus euphratica forestDali Yabuyi Oasisprincipal component analysis
万方数据
维普
