供氮水平对爬山虎(Parthenocissus tricuspidata Planch)生物量及养分分配的影响  

Effect of different nitrogen rates on Parthenocissus tricuspidata Planch seedling growth and nutrient distribution

作　　者：王忠强[1] 吴良欢[1] 刘婷婷[2] 褚有为 邵雪玲[1] 

机构地区：[1]浙江大学环境与资源学院环境修复与生态健康教育部重点实验室,杭州310029 [2]东北师范大学城市与环境科学学院,长春130024 [3]宁波市江北区农林水利局林特工作总站,浙江宁波315020

出　　处：《生态学报》2007年第8期3435-3441,共7页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30370838);宁波市科技合作计划资助项目(2005C100041)~~

摘　　要：爬山虎是典型的亚热带木本攀援植物,在垂直绿化、植被恢复和水土保持等方面的应用日益普遍,而营养元素对爬山虎生长的影响还缺乏研究,这不利于爬山虎的生长调控与合理应用。通过水培试验,对不同氮素水平(0、0.15、0.3、0.45、0.6、0.75g.L-1)条件下爬山虎幼苗生长、氮磷钾营养分配和利用状况作了研究。结果表明:供氮水平的提高能显著促进植株的生物量增加,并影响茎叶的生物量分配比例,供氮处理的叶生物量占总生物量的50%以上;供氮水平的提高能增加植株根、茎、叶的氮含量,对磷含量影响不显著,对茎叶中的钾含量有一定的稀释作用;叶片是主要的氮养分贮存器官,叶片氮累积量达到整个植株总氮累积量的60%以上;供氮水平的增加,降低了爬山虎的氮利用率,提高了磷钾的利用率。Parthenocissus tricuspidata Planch is a typical woody vine plant in subtropical area. It is planted widely for vertical surfaces landscaping, soil erosion control, and revegetation. However, little is known about the relationship between nutrient supply and Parthenocissus tricuspidata Planch growth. A hydroponic culture experiment was conducted to investigate the effects of different nitrogen rates （0, 0.15, 0.30, 0.45, 0.60, 0.75 g. L-I） on Parthenocissus tricuspidata Planch seedling growth, nutrient use efficiency, and nutrient distribution in different plant parts. Supplying high nitrogen to Parthenocissus tricuspidata Planch significantly increased plant biomass. Plant biomass allocation ratios among root, stem, and leaf were also affected by different nitrogen rates. For treatments supplied with nitrogen, leaf accounted for more than 50% of total plant biomass, while stem and root accounted for less than 40% and 10%, respectively. Increasing nitrogen rate increased nitrogen content in root, leaf, and stem, but did not have significant effect on phosphorus content. Supplying nitrogen to Parthenocissus tricuspidata Planch reduced potassium content in stem and leaf because of dilution effect, but the trend with increasing nitrogen rate was not obvious. Leaf was the main tissue for nitrogen accumulation, accounting for more than 60% of total accumulated nitrogen in plant. Higher nitrogen rates reduced nitrogen use efficiency, but increased phosphorus and potassium use efficiency by Parthenocissus tricuspidata Planch. The results indicated that nitrogen nutrition could significantly influence Parthenocissus tricuspidata Planch growth, nutrient use efficiency, and nutrient distribution in plant tissues.

关 键 词：爬山虎 氮素营养 生物量 养分分配 养分利用率 

分 类 号：Q948[生物学—植物学]