Health Evaluation of Forest Ecosystem in Bijie City
The health degree of forest ecosystem in Bijie City was analyzed in order to provide theoretical support for regional forestry development.In this study,forest sample land system was selected in Bijie City,and ecosystem health evaluation indexes were evalua-ted for forest types such as broadleaf mixed forest(A)Larch pure forest(B)coniferous mixed forest(C)Larch middle and young pure forest(D)broadleaf pure forest(E)artificial coniferous young forest(F)shrub forest(G).The relationship between soil physi-cal and chemical properties and forest health was analyzed.The results showed that the weight of Shannon-Wiener diversity index,Simpson diversity index,Pielou evenness index and Margalef species richness was 0.15 with no significant difference.The health grade of the mixed broad-leaved forest is A,mainly because of the complex structure of the natural forest system,the formation of a good bio-logical cycle among various elements,and the rich species diversity.Larch pure forest and coniferous mixed forest are planted in a wide range,their community hierarchy is complex,but the biodiversity is insufficient,so it needs to be properly tended.Pure broadleaf for-est,young artificial coniferous forest and shrub land belong to the sub-health and unhealthy state,the density is too large and the structure is single.The analysis of soil physical and chemical properties showed that there were significant correlations between total K content,soil water content,soil bulk density and forest health evaluation results(P<0.05).The results showed that the health of for-est ecosystem in Bijie City was good,the health of natural forest was better than that of plantation forest,and the proportion of near ma-ture forest and mature forest was higher.
NETL
NSTL
万方数据
