| 黄波罗不同根序的解剖结构及其功能异质性 |
| |
| 引用本文： | 卫星,刘颖,陈海波. 黄波罗不同根序的解剖结构及其功能异质性[J]. 植物生态学报, 2008, 32(6): 1238-1247. DOI: 10.3773/j.issn.1005-264x.2008.06.004 |
| |
| 作者姓名： | 卫星 刘颖 陈海波 |
| |
| 作者单位： | (1 东北林业大学林学院, 哈尔滨 150040); (2 伊春林业科学院, 黑龙江伊春 153000) |
| |
| 基金项目： | 黑龙江省自然科学基金，黑龙江省青年科学技术专项资金，东北林业大学校科研基金 |
| |
| 摘 要： | 细根是树木吸收水分养分的主要器官, 其生长与周转对森林生产力及生态系统物质循环具有重要的影响。为了更好地认识细根的结构特征与功能及其在根序中的分布, 采用石蜡切片方法对黄波罗(Phellodendron amurense) 1～5级根解剖结构(直径、皮层组织、通道细胞数目、维管束发育和菌根侵染等)进行了观察统计。研究表明: 细根直径、维管束直径以及维管束在根中所占的比例随根序增加而增加。1~3级根皮层层数、皮层薄壁细胞直径相近, 但总体呈减少趋势, 部分4级根有少量残留的皮层, 而成熟的5级根已经没有表皮及皮层组织。1~3级根具有通道细胞, 菌丝侵染率均较高; 4、5级根无通道细胞, 也无菌丝侵染。1、2级根是初生根, 无木栓层; 4、5级根是次生根, 具有完整的木栓层; 3级根中既有初生根, 也有次生根, 并逐渐形成木栓层。说明随根序升高, 细根吸收能力减弱, 输导能力增加, 抵御环境胁迫的能力增加, 有利于延长寿命。根据解剖结构、直径和根序的关系, 将黄波罗前3级根中直径小于0.8 mm、未形成连续木栓形成层、具有通道细胞的根定义为细根。
|
| 关 键 词： | 黄波罗 细根 根序 解剖结构 异质性 |
ANATOMICAL AND FUNCTIONAL HETEROGENEITY AMONG DIFFERENT ROOT ORDERS OF PHELLODENDRON AMURENSE |
| |
| WEI Xing,LIU Ying,CHEN Hai-Bo. ANATOMICAL AND FUNCTIONAL HETEROGENEITY AMONG DIFFERENT ROOT ORDERS OF PHELLODENDRON AMURENSE[J]. Acta Phytoecologica Sinica, 2008, 32(6): 1238-1247. DOI: 10.3773/j.issn.1005-264x.2008.06.004 |
| |
| Authors: | WEI Xing LIU Ying CHEN Hai-Bo |
| |
| Affiliation: | 1School of Forestry, Northeast Forestry University, Harbin 150040, China; 2Yichun Academy of Forestry Science, Yichun, Heilongjiang 153000, China |
| |
| Abstract: | Aims Fine roots are the primary organs for nutrient and water uptake in trees. The growth and turnover of fine roots significantly influence productivity and matter cycles in forest ecosystems. Our objective was to elucidate the basic structure, function and allocation of fine roots in Phellodendron amurense. Methods We made paraffin slices stained by safranin and fast green to observe anatomical structures (such as diameter, cortex, number of passage cells, development of vascular bundle, mycorrhizae of roots, etc.) of the first five orders of roots of P. amurense. Bright-light and fluorescence microscopes were used to observe and take photos. Important findings Root diameter (R), vascular bundle diameter (V) and V/R increased as root order increased. The thickness and layers of cortex were similar in the first three orders. Few cortical cells were in fourth-order roots and almost none in fifth-order roots. There were higher mycorrhizae infections in the first three order roots than the last two orders, and the later had almost no fungi. Primary growth occurred in all first- and second-order roots, and secondary growth occurred in all fourth and fifth order roots. Some third-order roots had only primary growth, but some had secondary growth with inconsecutive phellogen. All results suggested that the ability of roots to absorb nutrients and water decreased but transport ability and longevity increased as root orders increased. According to the relationships among anatomical characteristics, diameters and root orders, the fine roots of P. amurense should be involved in the first three orders at most; these have passage cells but lack successive phellogen and have diameters less than 0.8 mm. |
| |
| Keywords: | Phellodendron amurense fine root root order anatomical structure heterogeneity |
| 本文献已被 维普 万方数据 等数据库收录！ |
| 点击此处可从《植物生态学报》浏览原始摘要信息 |
|
点击此处可从《植物生态学报》下载免费的PDF全文 |
|
