林分类型及郁闭度对多花黄精根茎多糖含量的影响

Effect of Forest Types and Canopy Density on Polysaccharide Content of Polygonatum cyrtonema

为科学指导林下栽培多花黄精,开展不同林分类型（毛竹林、阔叶树林、杉木林、马尾松林）及不同郁闭度（0.2～0.4、0.4～0.6、0.6～0.8、0.8～0.9）对多花黄精根茎多糖含量影响的比较试验。结果表明：不同林分类型下多花黄精平均根茎多糖含量：毛竹林（13.8%）〉阔叶树林（13.7%）〉杉木林（13.3%）〉马尾松林（12.5%）。不同林分郁闭度多花黄精的平均根茎多糖含量以郁闭度0.4～0.6最高,达13.8%;郁闭度0.2～0.4和0.6～0.8次之,分别为11.7%和11.2%;郁闭度0.8～0.9最低,为9.8%。多花黄精根茎多糖含量以2年生最高,达16.1%;1年生根茎次之,为15.5%;种苗根茎最低,为11.4%。因此,提高多花黄精根茎多糖含量适宜的林分类型分别为郁闭度为0.4～0.6的毛竹林或阔叶树林。

In order to provide scientific guidance for cultivation of Polygonatum cyrtonema, effect of forest types and canopy density on the P. cyrtonema polysaccharide content was studied in the Yangxi Town ofSanming City, Fujian Province. Results showed that the root polysaccharide content of P. cyrtonema indifferent forest types ranked from high to low was moso bamboo forest（13.8%）, broad-leaved forest（13.7%）,Cunninghamia lanceolata forest（13.3%） and Pinus massoniana forest（12.5%）. The root polysaccharidecontent of P. cyrtonema with different canopy densities ranked from high to low was 0.4-0.6（13.8%）, 0.2-0.4（11.7%）, 0.6-0.8（11.2%） and 0.8-0.9（9.8%）. The root polysaccharide content of P. cyrtonema with differentgrowth years ranked from high to low was 2 years（16.1%）, 1 year（15.5%） and seedlings roots（11.4%）.Therefore, the suitable forest types to enhance polysaccharide contents of P. cyrtonema roots were mosobamboo forest or broad-leaved forest with canopy density of 0.4-0.6.