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油松是我省的主要造林树种之一。全省共有油松人工林800余万亩,居人工林之首,且半数以上郁闭成林,为经营好这部分森林提供科学依据,我们结合油松人工林定量间伐试验,于1984年着手研究了油松人工林地上部分(干、枝、叶)的形态结构及生物量的变化规律,以评定林分的生产力,挖掘生产潜力,制定合理经营措施,促进林木生长。一、试验地概况本试验地选设在素称“油松之乡”的太岳山林区龙泉林场月则沟。东经约为112°30′,北纬36°54′,海拔1400米左右,无霜期120天左右,年平均气温8.6℃,7月份平均气温21.8℃,1月份平均气温-7.0℃,年降水量660毫米;土壤为沙壤土,土层厚度0.3—0.5米,PH∶8;植被主要为蒿类、羊胡草、醋柳、绣线菊、山刺梅等。坡向:北
Pinus tabulaeformis is one of the main afforestation species in our province. The province has a total of more than 800 acres of pine plantation, ranking first in plantation, and more than half of the closed forest, in order to manage this part of the forest to provide a scientific basis, we pine quantitative plantation quantitative thinning test, started in 1984 The morphological structure and biomass variation of aerial parts (stem, branch and leaf) of Pinus tabulaeformis plantation were studied in order to assess the productivity of the stands, tap the potential of production, establish reasonable management measures and promote the growth of trees. First, the test site Overview The test ground set in the known as “hometown of pine trees,” Taiyue Mountain Forest Longquan farm ditch. East longitude is about 112 ° 30 ’, latitude 36 ° 54’, elevation about 1400 meters, frost-free period is about 120 days, the annual average temperature is 8.6 ℃, the average temperature in July is 21.8 ℃, the average temperature in January is -7.0 ℃, the annual rainfall is 660mm ; The soil is sandy loam, the thickness of the soil layer is 0.3-0.5 meters, PH: 8; and the vegetation is mainly Artemisia, Aristolochia grass, vinegar willow, Spiraea, Sangthorn plum and so on. Aspect: North