在黄陵县北部山区进行了不同封山育林技术措施对林地灌木种类、林木生长量、蓄积量及生物量等影响研究,结果显示,封山育林5年后,灌木种类增加了忍冬、鼠李和悬勾子;灌木数量增加645株（丛）·hm-2,覆盖度提高了35%,达85%以上;封育林地油松、侧柏的生物量分别为106.5t·hm-2和76.5t·hm-2,分别提高了48.8%和35.3%,封育区沙棘分别与油松、侧柏的混交林蓄积量是150.0m3·hm-2和29.2m3·hm-2,较未封育区增长了67.4%和56.9%;封育后林木生长快,枝下高度增加,林分质量提高。%Influence of mountain closure measures was studied with respect to shrub species, growth volume, stock volume and biomass. The result showed that five-year＇s mountain closure increased the shrub species and quantity, with shrub quantity increased by 645 plants/ hm2 , coverage increased by 35% ,reaching 85 % ; increased the biomass of Pinus Tabulaeformis Cart. and Platycladus orientalis by respectively 106.5 t/ hm2 and 76.5 t/hm2 , that is 48.8% and 35.3% over the original. Hippophae forest mixed with Pinus Tabulaefor- mis Carr. and Platycladus orientalis respectively have the stock volume increased by 150 m3/hm2 and 29.2 m3/hm2 , that is 67.4% and 56.9% over the forests before closure.
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