北京市低山区水土保持林评价与分级

Evaluation and Classification on Forest for Soil and Water Conservation in Low Mountain Area of Beijing City

以北京低山区同龄油松(Pinus tabulaeformis)林、侧柏(Platycladus orientalis)林、刺槐(Robinia pseudoacacia)林和栎类(Ouercus liaotungensis)林为研究对象,设置32个30m×30m标准样地,结合当地实际情况,运用数理统计方法及专家咨询法筛选出三级共12个评价指标,构建水土保持林评价指标体系,建立评价综合模型,计算林分综合评价指数,并对各林分进行了评价。将水土保持林分为四级:一级水土保持林,综合评价值S≥8;二级水土保持林,综合评价值5≤S<8;三级水土保持林,综合评价值2≤S<5;四级水土保持林,综合评价值S<2。探讨了不同级别的水土保持生长状况及立地特征,并提出了合理的改造措施。

Taking Pinus tabulaeformis,Platycladus orientalis,Robinia pseudoacacia and Ouercus liaotungensis forests in the same period in the Beijing low mountain area as a case,this paper studied evaluation on health conditions of different tree species and different standing forests for soil and water conservation.Through the construction of the evaluation system,the establishment of a comprehensive evaluation model,calculation of the stand comprehensive evaluation index,different forest stands were evaluated.Then the soil and water conservation forest was divided into four classes： the first class forests for soil and water conservation with comprehensive evaluation value of S≥8;the second class with 5≤S〈8;the third class with 2≤S〈5;the fourth class with S〈2.Then growth conditions and site characteristics of the different types of forest for soil and water conservation was discussed,and a reasonable improvement measures was proposed.