华南地区4种禾草的耐阴性比较研究

Effects of shade on characters of grasses in Guangzhou

对露籽草（Ottochloa nodosa）、中间型竹叶草（Oplismenus compositus var. owaterii）、弓果黍（Cyrtococcum patens）、沟叶结缕草（Zoysia matrella）4种林荫禾草持续180 d遮阴（遮阴率为96%）,测定他们的株型、生物量、密度、叶片枯黄率、叶绿素含量变化以及绿色盖度。结果表明,完全遮阴条件下,4种禾草植株增高、叶片增长并增宽;生物量和株丛密度降低;叶片枯黄率增高,枯黄叶片主要集中在地面0-5 cm处;叶绿素a和b含量增加,叶绿素a/b的值减少;沟叶结缕草、中间型竹叶草、弓果黍和露籽草的绿色盖度分别为0%、25%、40%和55%。

Plant＇s form,biomass,lawn coverage,density,leaves withered rate and Chlorophyll content were determined by continuing（6 months）over shading treatment（shade rate reached 96%）.The results demonstrated that the height,length and breadth of leaf were increased to a certain degree through shading treatment;the content of Chlorophyll a and Chlorophyll b in leaf was increased too,but the value of Chlorophyll a/b was decreased;the leaves withered rate was increased,and most of the dry leaves gather at 0～5 cm of the bottom;biomass and density were decreased.Zoysia matrella,Oplismenus compositus var.owaterii,Cyrtococcum patens A.Camus and Ottochloa nodosa still maintain a certain green coverage of 0%,25%,40% and 55% respectively.