Spatial Distribution and Quality of Branches on Two Types of High-grafted Loquat Trees
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摘要:
目的 探讨高接枇杷两种树形的枝梢空间分布特点及质量差异,为高接换种丰产树形的培养提供依据。 方法 以高接换种后5年生多主枝自然圆头形和多主枝矮化开心形枇杷品种贵妃为试材,采用改进网格法进行分格定位,根据树高由下至上分为F1(树高0.0~100.0 cm)、F2(树高100.1~200.0 cm)、F3(树高200.1~300.0 cm)、F4(树高>300.0 cm)层,根据中心干距离远近设P1(内部,距离中心干0.0~100.0 cm)、P2(中部,距离中心干100.1~200.0 cm)、P3(外围,距离中心干>200. 0 cm)区。测量方格内代表性枝梢的长度、粗度、叶片数和枝角等,统计枝梢数、花穗数、枝梢抽穗率等。 结果 多主枝自然圆头形的树高、叶幕层厚、冠幅、枝梢数、花穗数、枝梢抽穗率、枝角、节间长度均大于多主枝矮化开心形;在水平方向上,两种树形的枝梢数、花穗数主要分布在P2区,其次P1区;在垂直方向上,多主枝自然圆头形枝梢主要分布在F2、F3层,多主枝矮化开心形主要在F2层。多主枝自然圆头形的枝梢抽穗率、枝梢长度、枝梢粗度均为F4>F3>F2层;F2层枝梢数、花穗数、枝梢粗度、枝角为P3>P1,F3层枝梢抽穗率、枝角、节间长度为P3> P1区。多主枝矮化开心形的枝梢数和花穗数为F2>F3层,枝梢长度、粗度为F3>F2层;F2和F3层叶片数、节间长度为P1>P3区,枝角为P3>P1区。 结论 两种树形的枝梢主要分布在次高层和次外层,多主枝矮化开心形的枝梢和花穗在冠层内分布更均匀,树冠内膛无枝梢或枝梢量少的低效或无效空间占比更少,为更高效树形。 Abstract:Objective Differences in spatial distribution and quality of branches between two types of high-grafted loquat trees were examined. Methods Using 5-year-old high-grafted and replanted naturally round head and dwarf open heart-shaped multiple main branch Guifei loquat trees, an improved grid method was applied to compartmentalize into F1, F2, F3, and F4 layers according to plant height measured from the bottom to the top, as well as P1, P2, and P3 zones according to distance from the central trunk for the experimentation. Length, thickness, number of the leaves and angle of representative branches in the target measurement grids were collected. Numbers of the branches, spikes and heading rates of the branches were counted. Results The plant height, curtain layer thickness, crown width, branch number, spike number, branch heading rate, branch angle, and internode distance of the natural round head trees were greater than those of the dwarf open heart-shaped counterparts. Horizontally, the number of branches and spikes of both types of Guifei loquat trees were mainly distributed in the P2, followed by the P1 zone. Vertically, the trees with a naturally round head were largely distributed in the F2 and F3 layers, while the dwarf trees with an open heart-shaped canopy were predominantly distributed in the F2 layer. The heading rate, length, and thickness of the round head-shaped branches were F4>F3>F2. The number, spikes, thickness, and angle of the branches in the F2 layer were P3>P1. The heading rate, branch angle, and internode distance in the F3 layer were P3>P1. The number of branches and spikes of the dwarf variety were F2>F3, while the length and thickness of the branches F3>F2. The number of leaves and internode distance in the F2 and F3 layers were P1>P3; but the branch angle, P3>P1. Conclusion The branches on the Guifei loquat trees of two differently shaped canopies grew in the sub-high and sub-outer layers of the plant. The branches and spikes on the canopy of the dwarf open heart-shaped trees were more evenly distributed and had less spaces that grew few or no branches in the inner chamber of the crown making the type of tree potentially more productive than the round head variety. -
Key words:
- Loquat /
- tree shape /
- branch count /
- branch quality /
- heading number
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图 2 两种树形冠层内枝梢和花穗的水平分布
A、B为多主枝自然圆头形;C、D为多主枝矮化开心形;X、Y轴数值为与主干距离。
Figure 2. Horizontal distribution of branches (left) and panicles (right) on canopies of two types of loquat tree
A、B: Naturally round head tree with multiple main branches;C、D: dwarf, open heart-shaped tree with multiple main branches;The X-axis and Y-axis value is the distance from the trunk.
图 4 两种树形冠层内不同部位枝梢(左图)和花穗(右图)分布情况
A、B为多主枝自然圆头形;C、D多主枝矮化开心形;X、Y轴数值为与主干距离。
Figure 4. Distribution of branches (left) and panicles (right) in parts of canopies of two types of loquat tree
A、B: Naturally round head tree with multiple main branches;C、D: Dwarf, open heart-shaped tree with multiple main branches;The X-axis and Y-axis value is the distance from the trunk.
表 1 贵妃枇杷两种树形的树体生长量比较
Table 1. Growth of two types of loquat tree
项目Item 多主枝自然圆头形
Naturally round head tree
with multiple main branches多主枝矮化开心形
Dwarf, open heart-shaped
tree with multiple main branches树高 Tree height/cm 355.67±25.11aA 253.07±2.65bB 冠幅 Crown diameter Canopy/cm 500.67±47.16×447.67±61.17aA 427.67±33.56×356.33±31.82bB 树况 Tree condition 叶幕层厚 Thickness of canopy layers/cm 303.21±19.97aA 187.39±12.50bB 枝梢数 Number of branches 191.26±26.51aA 139.38±24.54bB 花穗数 Number of flower spikes 146.27±8.33aA 97.06±11.71bB 枝梢抽穗率 Flowering branch rate/% 76.65±14.57aA 69.60±9.54bA 长度 Length/cm 38.89±3.93bA 45.24±3.29aA 粗度 Diameter/mm 10.95±0.82bB 12.04±0.94aA 枝梢 Branch tip 叶片数 leave number 23.44±3.06bB 29.29±2.32aA 枝角 Branch/° 40.46±6.03aA 30.58±3.68bB 节间长度 Internode length/cm 1.79±0.17aA 1.58±0.14bA 粗长比 Shoot length/diameter ratio 0.28±0.01aA 0.26±0.01bA 同一列中大写字母表示0.01显著水平差异、小写字母表示0.05显著水平差异。下同。
In the same column, majuscule indicate a significant level difference of 0.01 and lowercase letters indicate a significant level difference of 0.05. The same below.表 2 两种树形枝梢性状的水平分布特点
Table 2. Horizontal distribution of branch traits on two types of loquat tree
树形
Tree shape水平分区
Horizontal partitioning枝梢长度
Shoot length/cm枝梢粗度
Shoot thickness/ mm叶片数
Number of blades/leaf节间长度
Internode length/cm枝角
Branch/°多主枝自然圆头形
Naturally round head tree
with multiple main branchesP1 39.70±3.96bc 11.78±0.95ab 24.00±2.00bc 1.64±0.14a 30.24±1.53a P2 36.74±3.12c 11.22±0.85ab 21.58±1.98c 1.70±0.14a 38.88±3.65a P3 30.82±6.43d 10.86±0.86b 20.83±2.64c 1.53±0.11a 46.08±2.90a 多主枝矮化开心形
Dwarf, open heart-shaped
tree with multiple main branchesP1 47.78± 1.30a 12.38±0.63a 30.50±1.29a 1.58±0.03a 31.35±2.95a P2 42.60±5.35ab 12.51±0.92a 28.33±1.87ab 1.50±0.15a 38.21±5.92a 多主枝矮化开心形P3区无枝梢。
Multi-main branch dwarfing open-center P3 area without branch tip.表 3 两种树形枝梢质量的垂直分布特点
Table 3. Vertical distribution of branch traits on two types of loquat tree
树形
Tree shape层级
Vertical hierarchy枝梢长度
Shoot length/cm枝梢粗度
Shoot thickness/mm叶片数
Number of blades/leaf节间长度
Internode length/cm枝角
Branch/°多主枝自然圆头形
Naturally round head tree
with multiple main branchesF4 48.49±5.03a 12.88±0.28a 26.3±1.32a 1.85±0.09a 31.27±3.96ab F3 33.13±3.51c 11.38±0.44b 21.68±2.27b 1.54±0.10b 35.12±3.85ab F2 32.06±3.69c 10.45±0.47c 19.96±1.15b 1.69±0.10ab 42.84±5.02a 多主枝矮化开心形
Dwarf, open heart-shaped tree
with multiple main branchesF3 46.44±6.74a 12.80±1.03a 30.20±2.83a 1.53±0.14b 28.97±4.02b F2 40.70±3.57b 11.36±0.27b 26.87±0.92a 1.51±0.12b 40.02±7.14ab 多主枝矮化开心形F4层无枝梢。
Multi-main branch dwarfed open-center F4 layer without branch tip. -
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