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不同产地苦楝苗期生长节律研究

Submit Time: 2021-12-19
Author: 蔡金峰 1* ; 郁万文 1 ; 汪贵斌 1 ; 曹福亮 1 ;
Institute: 1.南京林业大学南方现代林业协同创新中心南京210037;

Abstracts

苦楝在我国分布广泛,具有广泛的遗传变异。为进一步做好苦楝种源选择和良种选育工作, 该文对不同产地苦楝实生苗生长性状和各阶段的生长特点进行了比较分析,初步揭示了苦楝苗期生 长规律。研究以15 个产地的1 年生实生苗为试材,对苗高、地径、复叶生长及生物量积累等生长性 状进行了观测分析,并用Logistics 方程对生长节律进行了拟合。结果表明:(1)不同产地苦楝苗高、 地径生长差异均达显著水平,根生物量、茎生物量及复叶相关性状差异均达极显著性水平;(2)苗高 和地径生长均呈现慢-快-慢的S 型生长规律,且均存在2 次生长高峰,与苗高生长高峰出现时间相 比,地径生长高峰出现时间较晚;(3)Logistic 拟合方程的R2 为0.976~0.994,均达到极显著相关 水平,说明可以用Logistic 方程来拟合苦楝的生长节律;(4)地径速生期持续时间总体上较苗高速 生期持续时间长20~30 d,北方产地苗高和地径进入速生期和结束速生期的时间均早于南方产地, 速生期苗高和地径累积生长量均超过总生长量的60%;(5)各生长指标均与纬度呈负相关关系,苗高、 根生物量及复叶面积与经度呈正相关关系,其他指标与经度呈负相关关系。综上结果表明,苦楝为 全期生长型树种,各生长性状在产地间达显著差异水平,生长受纬度和经度双重控制,以纬度控制 为主。
[英文摘要]Melia azedarach is widely distributed in China and has a wide range of genetic variation. In order to study the growth characters of 1-year-old seedlings of M. azedarach from different seed sources, the growth characters of seedling height, ground diameter, compound leaf growth and biomass accumulation of M. azedarach seedlings from 15 seed sources were observed, and the growth rhythm was fitted by logistic equation. The results were as follows: (1) There were significant differences in seedling height, ground diameter, root biomass, stem biomass and compound leaf correlation between different habitats(P<0.05 or P<0.01). (2) The growth of seedling heights and ground diameters showed a slow-fast-slow growth pattern with type S. Compared with the emergence time of seedling height growth peak, the emergence time of ground diameter growth peak was later. (3) The R2 of logistic fitting equation was 0.976-0.994, which reached the highly significant correlation level, indicating that the growth rhythm of M. azedarach could be fitted by logistic equation. (4) According to theoretical calculation and practical observation, the duration of fast-growing stage of ground diameter was generally 20-30 d longer than that of high-speed growth stage of seedling. The time of seedling heights and ground diameters entering fast-growing stage and ending fast-growing stage in northern locality was earlier than that in southern locality. The cumulative growth of seedling height and ground diameter in fast-growing stage was more than 60% of the total growth.(5)All though traits were negatively correlated with latitude, seedling height, biomass of root and leaf area were positively correlated with longitude, the other traits were negatively correlated with longitude. In general, M. azadarach begongs to full-time growth type with significant differences in growth traits among seed sources. The growth was regulated by latitude and longitude, mainly by latitude .
Download Comment Cooperative journals:《广西植物》 Hits:3607 Downloads:271
Recommended references: 蔡金峰,郁万文,汪贵斌,曹福亮.(2021).不同产地苦楝苗期生长节律研究.广西植物.[ChinaXiv:202112.00139] (Click&Copy)
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[V1] 2021-12-19 21:30:36 chinaXiv:202112.00139V1 Download
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