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中国农学通报

中国农学通报 ›› 2026, Vol. 42 ›› Issue (7): 70-76.doi: 10.11924/j.issn.1000-6850.casb2025-0901

• 林学·园艺·园林 • 上一篇    下一篇

修枝对桉树107无性系生长及碳汇效益的影响

李国龙1,2(), 陆钊华2, 姚洁玲3, 马留银1, 杨德明2, 徐建民2, 胡志康2, 张云东3, 熊珊2, 李光友2()   

  1. 1 福建农林大学， 福州 350002
    2 中国林业科学研究院热带林业研究所， 广州 510520
    3 普洱市卫国林业局， 云南宁洱 665100
  • 收稿日期:2025-11-03 修回日期:2026-03-18 出版日期:2026-04-15 发布日期:2026-04-15
  • 通讯作者:
    李光友，男，1970年出生，广东广州人，研究员，博士，从事林木遗传育种及栽培研究。通信地址：510520 广东省广州市天河区广汕一路 中国林业科学研究院热带林业研究所，Tel：028-87033632，E-mail：。
  • 作者简介:

    李国龙，男，2000年出生，甘肃定西人，硕士，从事林木遗传育种及栽培研究。E-mail：。

  • 基金资助:
    十四五重点研发“桉树多轮伐期生产力和地力维持技术”(2023YFD2201003)

Effect of Pruning on Growth and Carbon Sequestration Benefits of Eucalyptus 107 Clone

LI Guolong1,2(), LU Zhaohua2, YAO Jieling3, MA Liuyin1, YANG Deming2, XU Jianmin2, HU Zhikang2, ZHANG Yundong3, XIONG Shan2, LI Guangyou2()   

  1. 1 Fujian Agriculture and Forestry University, Fuzhou 350002
    2 Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou 510520
    3 Weiguo Forestry Bureau, Ning’er, Yunnan 665100
  • Received:2025-11-03 Revised:2026-03-18 Published:2026-04-15 Online:2026-04-15

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摘要：

探讨修枝强度对桉树107无性系人工林生长及生态功能的影响，为科学抚育管理提供理论依据和实践指导。采用随机完全区组设计，在云南省普洱市卫国林业局宁洱县小黑江基地设置4种修枝方式（不修枝、修除1/3树高以下分枝、修除1/2树高以下分枝、修除2/3树高以下分枝）。于修枝后1.5、2.5、5年对林分的树高、胸径、单株材积、保存率、单位面积蓄积量及连年生长量进行调查分析，并分析修枝对桉树根际土壤化学性质和碳汇功能的影响。结果表明：（1）保存率方面，修除1/2树高以下分枝在5年时保存率最高(83.75%)，修除2/3树高以下分枝保存率最低(73.75%)。（2）生长指标方面，1.5年时修除1/2树高以下分枝的树高(12.40 m)、胸径(10.69 cm)、单位面积蓄积量(46.956 m3/hm2)显著高于其他处理，2.5~5年修枝效应逐渐减弱，5年时各处理生长差异不显著。（3）土壤与碳汇方面，修枝可显著提升土壤有机质(33.476 g/kg)、全氮(1.060 g/kg)等养分含量，修除1/2树高以下分枝在1.5、2.5年固碳量(257.363、313.842 t/hm2)和制氧价值（10.295万、12.554万元/hm2）最高，5年时各处理差异缩小。研究认为，适度修枝（修掉1/2树高以下分枝）可短期提高桉树生长、保存率、土壤质量及碳汇功能，但长期效益趋同。建议根据林分发育阶段和培育目标，选择适宜修枝方式，以实现人工林的高效经营与生态效益平衡。

关键词: 桉树人工林, 修枝方式, 保存率, 生长性状, 碳汇, 土壤化学性质

Abstract:

This study aimed to investigate the effects of pruning intensity on the growth and ecological functions of Eucalyptus 107 clone plantations, providing theoretical and practical guidance for scientific silvicultural management. A randomized block design was implemented at the Xiaoheijiang Base in Ning’er County, Pu’er City, Yunnan Province, with four pruning treatments: no pruning (control), pruning branches below 1/3 of the tree height, pruning branches below 1/2 of the tree height, and remove branches below 2/3 tree height. Growth parameters, including tree height, diameter at breast height (DBH), individual tree volume, conservation rate, stand volume per unit area, and annual increment, were investigated at 1.5, 2.5, and 5 years after pruning. At the same time, the chemical properties (organic matter, total nitrogen, total phosphorus, total potassium) and carbon sequestration capacity of Eucalyptus rhizosphere soil were analyzed. The results showed that at 5 years, the preservation rate of pruning below 1/2 tree height was the highest (83.75%), and the preservation rate of pruning below 2/3 tree height was the lowest (73.75%); at 1.5 years, pruning below 1/2 tree height significantly enhanced tree height, DBH and stand volume per unit area, though these effects diminished as the plantation aged. Pruning improved soil nutrient content (organic matter, total nitrogen, phosphorus, potassium) and soil quality. The pruning below 1/2 tree height treatment exhibited the highest carbon sequestration and oxygen production values at 1.5 and 2.5 years, but differences among treatments narrowed by 5 years. Moderate pruning (removing branches below 1/2 tree height) can enhance short-term growth, conservation rates, soil quality, and carbon sequestration capacity, but long-term benefits converge across treatments. It is recommended to adopt pruning intensities tailored to stand developmental stages and management goals to balance efficient plantation operations with ecological benefits.

Key words: Eucalyptus plantation, pruning method, conservation rate, growth traits, carbon sink, soil chemical properties