植物生态学报 ›› 2010, Vol. 34 ›› Issue (11): 1336-1343.DOI: 10.3773/j.issn.1005-264x.2010.11.011
收稿日期:
2010-03-08
接受日期:
2010-07-05
出版日期:
2010-03-08
发布日期:
2010-10-31
通讯作者:
王政权
作者简介:
(E-mail: wzqsilv@mail.nefu.edu.cn)
LIU Ying, GU Jia-Cun, WEI Xing, XU Yang, WANG Zheng-Quan*()
Received:
2010-03-08
Accepted:
2010-07-05
Online:
2010-03-08
Published:
2010-10-31
Contact:
WANG Zheng-Quan
摘要:
树木根系中1级根在养分和水分吸收方面发挥着重要作用。研究1级根的形态结构与功能的联系, 对了解1级根的生理功能和寿命, 以及森林生态系统碳和养分的循环具有重要的理论意义。但是, 1级根在根系统中, 因着生的位置不同, 可能表现出不同的生理生态功能。该研究以胡桃楸(Juglans mandshurica)、黄波罗(Phellodendron amurense)和水曲柳(Fraxinus mandshurica)人工林根系的1级根为研究对象, 研究了不同着生位置的1级根的形态、解剖结构和组织化学特征。将1级根按着生位置的不同分成3类: Ar类根为2级根上的1级根; Br类根为2级-4级根的根尖; Cr类根为3级-5级根上的1级根。结果表明: 不同着生位置的1级根, 形态、解剖结构和组织化学方面都具有高度的异质性。3类1级根中, Ar类根数量多、根长较短、直径细, N含量高, 皮层比例高、维根比低, 主要由二原型原生木质部的根组成; Br类和Cr类根数量较少、单根较长、直径粗, N含量低, 皮层比例低、维根比高, 主要由多原型原生木质部的根组成。研究结果对了解不同着生位置的1级根的吸收功能和寿命具有重要的理论意义。
刘颖, 谷加存, 卫星, 许旸, 王政权. 树木不同着生位置1级根的形态、解剖结构和氮 含量. 植物生态学报, 2010, 34(11): 1336-1343. DOI: 10.3773/j.issn.1005-264x.2010.11.011
LIU Ying, GU Jia-Cun, WEI Xing, XU Yang, WANG Zheng-Quan. Variations of morphology, anatomical structure and nitrogen content among first-order roots in different positions along branch orders in tree species. Chinese Journal of Plant Ecology, 2010, 34(11): 1336-1343. DOI: 10.3773/j.issn.1005-264x.2010.11.011
树种 Species | Ar | Br | Cr | Total | |||
---|---|---|---|---|---|---|---|
数量 Number | 百分比 (%) Percentage | 数量 Number | 百分比 (%) Percentage | 数量 Number | 百分比 (%) Percentage | 数量 Number | |
胡桃楸 Juglans mandshurica | 224 ± 17 | 72 | 59 ± 5 | 19 | 31 ± 3 | 9 | 314 ± 21 |
黄波罗 Phellodendron amurense | 22 ± 2 | 39 | 14 ± 1 | 25 | 21 ± 2 | 36 | 57 ± 5 |
水曲柳 Fraxinus mandshurica | 188 ± 15 | 56 | 62 ± 6 | 19 | 83 ± 7 | 25 | 333 ± 24 |
表1 胡桃楸、黄波罗和水曲柳不同位置1级根的数量及比例
Table 1 Root numbers and proportion of 1st-order roots in different positions in Juglans mandshurica, Phellodendron amurense and Fraxinus mandshurica trees
树种 Species | Ar | Br | Cr | Total | |||
---|---|---|---|---|---|---|---|
数量 Number | 百分比 (%) Percentage | 数量 Number | 百分比 (%) Percentage | 数量 Number | 百分比 (%) Percentage | 数量 Number | |
胡桃楸 Juglans mandshurica | 224 ± 17 | 72 | 59 ± 5 | 19 | 31 ± 3 | 9 | 314 ± 21 |
黄波罗 Phellodendron amurense | 22 ± 2 | 39 | 14 ± 1 | 25 | 21 ± 2 | 36 | 57 ± 5 |
水曲柳 Fraxinus mandshurica | 188 ± 15 | 56 | 62 ± 6 | 19 | 83 ± 7 | 25 | 333 ± 24 |
图1 胡桃楸(Juma)、黄波罗(Pham)和水曲柳(Frma)不同位置1级根的平均直径(A)和平均长度(B) (平均值±标准误差)。Ar、Br、Cr, 同表1。柱状图上a、b、c表示树种之内的差异显著性, p < 0.05。
Fig. 1 Mean root diameter (A) and mean root length (B) of 1st-order roots in different positions in Juglans mandshurica (Juma), Phellodendron amurense (Pham) and Fraxinus mandshurica (Frma) trees (mean ± SE). Ar, Br, Cr, see Table 1. Within each panel, mean values sharing different letters (a, b, c) indicate significantly differences within species at p < 0.05 level.
图2 胡桃楸(Juma)、黄波罗(Pham)和水曲柳(Frma)不同位置1级根的解剖特征。A, 维管束直径。B, 维根比。C, 皮层厚度。D, 皮层比例。E, 菌根侵染率。Ar、Br、Cr, 同表1。柱状图上的a和b表示树种之内的差异显著性, p < 0.05。
Fig. 2 Anatomical traits of 1st-order roots in different positions in Juglans mandshurica (Juma), Phellodendron amurense (Pham) and Fraxinus mandshurica (Frma) trees. A, Stele diameter. B, Ratio of stele diameter to root diameter. C, Cortical thickness. D, Cortical proportion. E, Mycorrhizal colonization. Ar, Br, Cr, see Table 1. Within each panel, mean values sharing different letters (a, b) indicate significantly differences within species at p < 0.05 level.
图3 胡桃楸(A)、黄波罗(B)和水曲柳(C)不同位置1级根原生木质部的类型和比例。Ar、Br、Cr, 同表1。
Fig. 3 Protoxylem type and proportion of 1st-order roots in different positions in Juglans mandshurica (A), Phellodendron amurense (B) and Fraxinus mandshurica (C) trees. Ar, Br, Cr, see Table 1.
图4 胡桃楸(Juma)、黄波罗(Pham)和水曲柳(Frma)不同位置1级根的氮含量。Ar、Br、Cr, 同表1。柱状图上的a和b表示树种之内的差异显著性, p < 0.05。
Fig. 4 Root N content of 1st-order roots in different positions in Juglans mandshurica (Juma), Phellodendron amurense (Pham) and Fraxinus mandshurica (Frma) trees. Ar, Br, Cr, see Table 1. Within each panel, mean values sharing different letters (a, b) indicate significantly differences within species at p < 0.05 level.
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