OALib Journal期刊
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华南热带森林两种林下植物氮磷比对氮磷添加的响应
DOI: 10.3724/SP.J.1145.2015.03014, PP. 919-925
Keywords: 华南,热带森林,氮磷添加,氮磷比,磷限制
Abstract:
基于华南热带次生林长达3年的氮(n)磷(p)添加实验,测定两种分布较广的林下乡土树种大青(cleroden-drumcyrtophyllum)和紫玉盘(uvariamicrocarpa)地上部(叶片和枝条)的n、p含量,试图阐明该热带森林的养分限制问题.结果显示:(1)两种植物的n、p含量差异极显著(p<0.001);同一植物中不同组织的n、p含量也存在差异;n、p添加对枝条的n、p含量影响最大,其次为新叶,对老叶的影响较小;(2)+n处理对大青和紫玉盘的n、p含量均无显著影响,但显著地降低了n:p(p=0.001),降低幅度分别为9%和50%;(3)+p处理对植物组织的n含量影响不显著,但极显著地提高了植物的p含量(p<0.001),分别提高了大青和紫玉盘p含量的54%和88%;+p处理极显著地降低了植物的n:p(p<0.001),其值分别为28%和60%;(4)+n或+p处理下,两种植物组织的p变化量与n:p变化量呈极显著负相关关系(p<0.001),可见植物p含量的变化是驱动n:p变化的主要因子.本研究表明,n、p添加对两种植物不同组织的n、p含量均有一定程度的影响,且+p处理的影响要大于+n处理,枝条比新叶、老叶对n、p添加的响应更敏感.因此,p素有效性可能是该热带地区植物生长的限制因子.
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