Abstract:

Forests in mountainous regions of Beijing serve as a green protection belt which ensures the ecological safety of the capital if it is in a healthy condition. Based on data of a forest resource inventory and plot investigation, the health status of forests in mountainous regions of Beijing was assessed with multi-scale including forest stands, landscape and regional scale. Multi-level fuzzy synthetic evaluation method was involved in the assessment. Results showed that, on the regional scale, the whole forests in mountainous regions of Beijing were basically sub-healthy. On the landscape scale, 4 kinds were robust, 12 kinds were sub-healthy and 2 kinds were unhealthy among the total 18 forest landscape element types. On the forest stand scale, among total 30 164 plots, 12 226 ones were sub-healthy and their area accounted for 42.21% of the total mountainous regions of Beijing. In addition, 9 534 plots were either unhealthy or in disease, and their area accounted for 27.57% of the total area. Therefore, above results suggest that it is urgent and necessary to carry on forest health management to improve forest health grade in mountainous regions of Beijing.

Key words: forest health, fuzzy synthetically evaluation, multi-scale, mountainous area of Beijing