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林业科学 ›› 2019, Vol. 55 ›› Issue (8): 45-53.doi: 10.11707/j.1001-7488.20190806

• 论文与研究报告 • 上一篇    下一篇

雷州半岛尾巨桉旱季径向生长特征及其影响因素分析

王志超, 许宇星, 竹万宽, 杜阿朋   

  1. 国家林业和草原局桉树研究开发中心 广东湛江桉树林生态系统国家定位观测研究站 湛江 524022
  • 收稿日期:2018-08-15 修回日期:2018-12-18 发布日期:2019-09-05
  • 基金资助:
    “十三五”国家重点研发计划课题(2016YFD0600505;2016YFD0600504);广西创新驱动发展专项(桂科AA17204087);广东湛江桉树林生态系统国家定位观测研究站项目(2019132141)。

Radial Growth Characteristics and Influencing Factors of Eucalyptus urophylla×E. grandis in Leizhou Peninsula in Dry Season

Wang Zhichao, Xu Yuxing, Zhu Wankuan, Du Apeng   

  1. China Eucalypt Research Centre, National Forestry and Grassland Administration Guangdong Zhanjiang Eucalyptus Plantation Ecosystem Research Station Zhanjiang 524022
  • Received:2018-08-15 Revised:2018-12-18 Published:2019-09-05

摘要: [目的]量化认识旱季尾巨桉的径向生长动态及其影响因素,为提高桉树林的木材产量及其科学经营提供数据支持及理论指导。[方法]应用DC3型径向变化记录仪对5.5年生尾巨桉旱季径向生长进行连续监测,同步观测林内外各环境因子,分析旱季径向变化与各个因子之间的相关关系。[结果]受树干水分平衡因素的影响,旱季晴天尾巨桉的树干径向日变化呈现出规律的周期性波动,其日最大值出现在9:00—10:00,而最小值出现在16:00—18:00;雨天树干呈持续膨胀后保持不变,最大值较晴天晚约2 h。旱季尾巨桉树干径向累积增长为波动性上升过程,可分为相对稳定期、快速增长期及失水收缩期3个阶段。在整个旱季内,各个时期径向生长的主导影响因子不同,其中土壤含水量、土壤温度和大气温度是影响尾巨桉旱季径向生长的主要因素。[结论]土壤水分和温度是影响尾巨桉旱季径向生长的主要因素,若旱季能够通过采取提高土壤温度和土壤含水量(灌溉等)等有效的经营措施,将对尾巨桉树干的径向生长起到促进作用。

关键词: 径向变化, 尾巨桉, 旱季, 影响因素

Abstract: [Objective] Quantitative understanding of the radial growth dynamics of Eucalyptus urophylla×E. grandis in the dry season and the influencing factors can provide data support and theoretical guidance for improving the wood yield of eucalyptus forest and its scientific management.[Method]The radial growth of 5.5-year-old E. urophylla×E. grandis in dry season was studied using a DC3 radial change recorder (Ecomatik, Germany), and the environmental factors inside and outside the forest were simultaneously observed. The relationship between the radial variation in dry season and various environmental factors was analyzed.[Result] The results showed that, the radial diurnalvariation of stems in dry season showed regular period icfluctuation under the influence of factors affecting stem water balance. The daily maximum value appeared in the morning (9:00-10:00) and the minimum value appeared in the afternoon (16:00-18:00). The stems in rainy days continued to expand and then remained unchanged. The maximum value was about 2 hours later than that on sunny days. The radial cumulative growth of E. urophylla×E. grandis stems in dry season was a volatility rising process, which could be divided into three periods:relative stable period, rapid growth period and dehydration contraction period. During the whole dry season, the dominant environmental factors affecting stem radial growth were different in different periods. The soil water content and temperature (soil temperature and atmospheric temperature) were the most important factors limiting the growth of stems in the dry season.[Conclusion]The main influencing factors affecting stem radial growth of E. urophylla×E. grandis in the dry season were water and temperature. If appropriate measures such as increasing soil temperature and soil water content (irrigation, etc.) can be applied in the dry season, the growth of E. urophylla×E. grandis stems will promoted.

Key words: stem radial variation, Eucalyptus urophylla×E. grandis, dry season, influencing factor

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