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标林是以林类为优势种和建群种形成的混交林和纯林，在其树种组成中陈类可占到8成以上，主要为栓皮标、麻标、锐齿标、倾栋等。标林是陕西省的地带性植被类型，分布广，面积大，在陕南2300m以下的山区，标林的面积与蓄积占所有林分总和的40％～SO％[1,3]，而在中、低山区则高达
The superscript forest is a mixed forest and a pure forest with forest species as the dominant species and species-building species. Chen species can account for more than 80% of the tree species, mainly including cotyledons, hemp, sharp teeth, . The target forest is a type of zonal vegetation in Shaanxi Province. It is widely distributed and large in area. In the mountainous area below 2300 m in southern Shaanxi, the area and accumulation of the target forest account for 40% ~ 50% of the total forest stand [1, 3] Middle and low mountains are as high as