三倍体毛白杨分枝格局对不同土壤供水水平的响应

doi:10.11707/j.1001-7488.20210315

Abstract

Abstract:

Objective: In this study, the effects of different irrigation quantity on the branching pattern and adaptability of biennial triploid Populus tomentosa plantation were investigated, in orderto provide theoretical basis for canopy management of triploid P. tomentosa plantation. Method: The branching patterns of 9 trees in a two-year-old triploid P. tomentosa plantation were measured under the sufficient drip irrigation, deficit drip irrigation and no irrigation treatment (CK). Result: The results showed that: 1) the average branch length and branching angle of the first-order branches of P. tomentosa were significantly affected by different irrigation quantity (P < 0.05). Under drip irrigation, the average branch length of the first-order branches was the longest (3.31 m) and the branching angle was the largest (59.81°). 2) The different treatments significantly affected branch diameter ratio (2∶1) (P < 0.05). The branch diameter ratio (2∶1) of control, full drip irrigation and deficit drip irrigation were 0.39, 0.51 and 0.39, respectively. 3) There were no significant differences inthe total branching rate and gradual branching rates of P. tomentosa among different treatments (P > 0.05). Under the conditions of sufficient drip irrigation, there were more new branches in the current year, and less new branches in CK treatment. Conclusion: In summary, the twig length, branching angle and branch diameter ratio of two-year-old P. tomentosa have strong plasticity and variability under different irrigation condition. When the soil moisture is sufficient, the number of branches of P. tomentosa increased, the first-order branches grow faster, the branching angle increased, and the overall branching rate was lower. The results of this study will be helpful to understand the branching pattern and the adaptive strategies of the poplar, and provide a theoretical basis for making the reasonable pruning measures.

Key words: Populus tomentosa, branching pattern, irrigation quantities, branch angle, bifurcation radio

CLC Number:

S718.3

Yaxiong Zhang,Ye Wang,Guangde Li,Doudou Li,Yuelin He,Benye Xi,Lijuan Sun. Response of Branching Pattern of Triploid Populus tomentosa to Variation Soil Water Regime[J]. Scientia Silvae Sinicae, 2021, 57(3): 145-151.

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处理 Treatments	样本数 Sample number	平均树高 Average height/cm	平均胸径 Average DBH/cm	平均枝下高 Average height under branch/cm
充分灌溉Full irrigation(FI)	3	6.85±0.72a	7.05±1.32a	1.78±0.23a
控水灌溉Control irrigation(CI)	3	6.79±0.46a	6.69±1.45a	1.75±0.15a
对照Control(CK)	3	5.50±0.56a	6.30±0.71a	1.67±0.11a

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Response of Branching Pattern of Triploid Populus tomentosa to Variation Soil Water Regime

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