长白山阔叶红松林生态价位分级与生态系统经营对策

Eco-value level classification and ecosystem management strategy of broad-leaved Korean pine forest in Changbai Mountain

引入生态价位概念 ,以长白山阔叶红松林为对象 ,采用层次分析法进行了生态价位划分 .长白山阔叶红松林的生态系统价值评价综合指数由物理环境因素、群落结构组成、干扰状况 3方面 8个指标构成 ,包括坡度、土层厚度、土壤母质稳定性、结构盖度指数、物种多样性指数、更新力指数、优势种寿命和干扰度 .采用层次分析法取得相应指标的系数 ;根据综合评价指数分布范围划分了 3个生态价位类型 ,即低生态价位 ,综合指数 1～ 1.874 ;中生态价位 ,综合指数 1.874～ 2 .74 9;高生态价位 ,综合指数 2 .74 9～3.6 2 3;对典型样地进行了生态价位分级 ,分析了各个生态价位类型森林的主要特征 ,据此提出了相应的生态系统管理对策 ,即高生态价位阔叶红松林采用封禁保护型自然经营 ,中生态价位阔叶红松林采用生态修复型半自然经营 。

To realize the sustainable management of forest ecosystems,we should explicitly clarify the types and differences of the ecosystem services provided by different ecosystems under different conditions,with rethinking about the value of forest ecosystems; then solid management strategies and measurements will be enacted and applied to achieve the objects. The broad leaved Korean pine forest (BLKPF) in Changbai Mountain is a unique and important forest type in China,owing to its many important ecosystem services such as preventing soil erosion,regulating climates,nutrient cycling,providing wood and non timber forest products,etc. This paper is a preliminary study on the management strategy of BLKPF on the basis of analyzing the characters of the ecosystems and the relative importance of services they provided in this region. Based on the latest research of ecosystem services of BLKPF in Changbai Mountain,an idea of eco value level (EVL) was introduced,and accordingly,management strategies were summarized by adopting the advanced theories in ecosystem management science and by analyzing field survey data.EVL means the relative amount of the value of ecosystem services provided by certain ecosystem,which can indicate the difference between services in given objects. The EVL classification of BLKPF implies the relative amount of the eco value of different ecosystems including virgin forest,secondary forest,forest with human disturbance,and man made forest in the clear cutting sites. Analytical Hierarchical Processing method was used to formulate the equation for EVL index. Eight factors,namely,slope,soil depth,stability of soil maternal material,coverage of above ground canopy,species diversity,regeneration rate of the stand,life span of dominant tree species,and intensity of human disturbance were chosen to build the formula. These factors belonged to three aspects affecting ecosystem services including the physical environment,community,and disturbance regime,and their selection and scaling were based on the previous studies on the BLKPF. The equation of EVL index ( EI ) was expressed as: EI=0.542A 1+0.171A 2+0.072A 3+0.067B 1+0.043B 2+0.014B 3+0.010B 4+0.081C 1. According to the range of EI ,ecosystems were classified into three types: low EVL type with EI from 1.000 to 1.874,medium EVL type with EI 1.874～2.749,and high EVL type with EI 2.749～3.623.Typical plots were surveyed and scaled with EI ,and the predominant characters of each EVL type were summarized. Most forests of high EVL type were those in sites at high risk of soil erosion and hard to recover after disrupted.Forests of medium EVL type were those with worse community structure and composition,and were disturbed by human activities in relative steep sites. Forests of low EVL type were those in plane site with serious disruption or some young man made stands. Based on the analyses of the characters of these three types,different management strategies were put forward. For high EVL type forest,strictly protection is most important to maintain the forest in natural succession and its eco services. For medium EVL type forest,the key points of management are restoring their health and vigor by regulating their composition and structure in a semi natural way. For low EVL type forest,some area could be used to extensive exploration for economic benefits,and the rests should be reconstructed towards the original stand in composition and structure,based on the ‘shadow ecosystem’ in a close to nature way to promote the capacity of providing more eco services.