亚热带六种天然林树种细根养分异质性
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湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地,湿润亚热带山地生态国家重点实验室培育基地

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福建省海西杰出青年人才基金项目(2010J06009);福建省高校杰出青年科研人才培育计划项目(JA10057);福建省自然科学基金项目(2009J01122)


Nutrient heterogeneity in fine roots of six subtropical natural tree species
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State Key Laboratory of Humid Subtropical Mountain Ecology,State Key Laboratory of Humid Subtropical Mountain Ecology,State Key Laboratory of Humid Subtropical Mountain Ecology,State Key Laboratory of Humid Subtropical Mountain Ecology,State Key Laboratory of Humid Subtropical Mountain Ecology,State Key Laboratory of Humid Subtropical Mountain Ecology

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    摘要:

    以福建省建瓯市万木林自然保护区常绿阔叶林6种优势树种为研究对象,分析其1-5级细根养分特征及其与细根形态特征和叶片养分的关系。结果发现:除沉水樟细根C含量表现为随序级升高而增加外,其余5种树种均没有明显变化规律;6种树种N、P含量基本表现为随序级升高而降低,C/N随序级升高而增加;但N/P随序级升高均没有明显变化规律。单因素方差分析发现:树种对C、N、P含量和C/N、N/P具有极显著影响(P<0.01),序级对6种树种N、P含量和C/N有极显著或显著影响(P<0.01, P<0.05),对C含量和N/P影响并不显著(P>0.05);双因素方差分析发现:树种和序级的交互作用对C、N、P含量和C/N有极显著或显著的影响(P<0.01, P<0.05),对N/P影响不显著(P>0.05)。相关性分析表明:在较高级根中C、N含量之间呈现相关性,在较低级根中N、P含量呈现相关性,同时C/N、N/P的变化均主要由N含量变化决定;6种树种细根比根长和N、P含量、C/N有极显著相关性(P<0.01),而与C含量和N/P相关性并不明显。一级根的N、P含量和N/P相比于整个细根更接近于叶片,但一级根与叶片N、P、N/P之间并没有显著的相关性(P>0.05)。

    Abstract:

    Fine roots, commonly defined as roots <2 mm in diameter, are often treated as a homogeneous mass compartment. However, this approach ignores the distinct branching structure of fine root systems, roots of different branch orders play different roles in belowground carbon and nutrient cycling. To date, it is remarkable how little we know about the chemical properties in fine root and the correlation between fine root and leaf in chemical properties, especially in subtropical evergreen broadleaved forest. So, in this study, intact fine root segments and leaves of six dominant tree species (Cinnamomum micranthum; Tsoongiodendron odorum Chun; Cinnamomum chekiangense; Castanopsis fabri; Altingia gracilipes; and Castanopsis carlesii) were sampled in an evergreen broadleaved forest located at the Wanmulin Nature Reserve, Jian'ou, Fujian province. We focused on: (1) the relationship between branch order and root nutrient concentrations; (2) the correlation between the chemical and morphological traits of fine root and between the chemical traits of root and leaf; (3) the effect of root order and tree species on root chemical traits. For Cinnamomum micranthum, C content increased as root order increased, while there was no distinct trend for the other five species. There was a negative relationship between root branch order and N and P concentration, and a positive relationship between root branch order and C/N ratios for the six tree species, while the N/P ratios had no distinct pattern with branch order. The one-way ANOVA demonstrated that tree species had significant effect on C、N、P concentration, C/N ratio, and N/P ratio (P<0.01). Though root order had significant or marked effect on N、P concentration and C/N ratio (P<0.01, P<0.05), it had no significant effect on C concentration and N/P ratio (P>0.05) for the six tree species. The two-way ANOVA showed that tree species ×root order interaction had significant or marked effect on C、N、P concentration and C/N ratio (P<0.01, P<0.05), while it had no effect on N/P ratio (P>0.05). The analysis of correlation revealed that variation in C/N ratio was determined by N concentration in the lower root order and by C concentration in the highest root order, and the variation in N/P ratio was determined by N concentration. Among tree species, C concentration was coupled with N concentration in the higher root order and the N concentration coupled with P concentration in the lower root order. Specific root length was correlated with N and P concentrations as well as C/N ratio (P<0.01), but had no significant correlation with C concentration and N/P ratio for the six tree species. The comparison among first root order, bulk fine root and leaf for the six tree species indicated that, while there was no significant correlation, N、P concentration and N/P ratio of the first root order were more similar to those of leaf than those of bulk fine root. It concludes that there was large heterogeneity in nutrient traits among different root orders for these subtropical evergreen broadleaved species, especially N and P concentrations, and the root tip to some extent can serve as an analogue to leaf with regard to nutrient traits.

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熊德成,黄锦学,杨智杰,卢正立,陈光水,杨玉盛,谢锦升.亚热带六种天然林树种细根养分异质性.生态学报,2012,32(14):4343~4351

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