Growth and biomass carbon sequestration of young Eucalyptus grandis with fertilization
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摘要: 桉树Eucalyptus作为世界三大速生树种之一，广泛用于营造人工林，其中巨桉Eucalyptus grandis以生长速度快和经济效益好而成为目前栽培面积最大的一种桉树。以不施肥为对照，研究不同施肥水平（含氮、五氧化二磷和氧化钾各15%的复合肥0，90，180，270 g株－1）下巨桉的生长及生物固碳量。结果表明：施肥90 ～ 270 g株－1与不施肥条件下相比，巨桉地径、冠径、树高、整株生物量和根冠比分别增加16.3% ～ 38.3%，17.1% ～ 44.5%，15.8% ～ 45.5%，21.8% ～ 59.5%和2.1% ～ 5.8%，且地径、冠径、整株生物量以及生物固碳量都显著大于不施肥处理；施肥180 g株－1的地径和树高与270 g株－1和90 g株－1差异均不显著，但施肥270 g株－1均显著高于90 g株－1，施肥90 g株－1的树高与不施肥处理间的差异不显著；各施肥水平下的冠径之间存在显著性差异。地径、冠径和树高生长速度与施肥量呈极显著正相关关系（P＜0.01），且在7月和8月的生长速度相对较快。除施肥270 株－1外，其他施肥处理的根冠比与不施肥处理差异不显著，各施肥水平的整株生物量和生物固碳量之间均存在显著性差异。说明在试验地条件下0 ～ 270 g株－1肥料用量范围内增加施肥量有利于促进巨桉生长，提高生物量和生物固碳量以及根冠比。这对巨桉林的科学施肥管理以及缓解全球气候变化具有重要的作用。图4参36Abstract: Eucalyptus is one of three fast growing tree types used widely in tree plantations，and Eucalyptus grandis has the largest cultivated area of all species because of its fast growth and favorable economic opportunities. To determine the effects of fertilization on growth and biomass carbon sequestration of E. grandis，a compound fertilizer containing 15% N，15% P2O5，and 15% K2O was applied with different treatments of （in gstem－1） 0 （ck），90 （Ⅰ），180 （Ⅱ），and 270 （Ⅲ），and a correlation analysis was employed. Each treatment has three replicates and each was arranged in random blocks. The soil was a Purple soil with an average pH of 5.60，and contained soil organic matter 15.3 gkg-1，total soil N 1.23 gkg-1，available N 82.8 mgkg-1，available P 51.38 mgkg-1 and available K 61.45 mgkg-1 prior to the start of the pot experiment. Results showed that compared to the control，fertilization treatments Ⅰ，Ⅱ，and Ⅲ significantly （One-way ANOVA Duncan Multiply Test） increased the stem base （P ＜0.05，16.3% － 38.3%），crown width （P＜0.05，17.1% － 44.5%），tree height （P＜0.05，15.8% － 45.5%），biomass （P＜0.05，21.8% － 59.5%），and root-shoot （R/S） ratio （P＜0.05，2.1% － 5.8%）. For stem base and tree height，fertilized treatments Ⅲ were significant higher than Ⅰ，but no significant difference was observed between Ⅱ and Ⅲ or Ⅰ. Among fertilized treatments，crown width was significantly different （P＜0.05）. Growth of the stem base，crown width，and tree height were significantly and positively correlated with the amount of applied fertilizer （P＜0.01） and with growth faster in July and August than other months（June and September）. For R/S，Ⅲ was significantly greater than ck. Also，among different treatments，significant differences in biomass（P＜0.05） and biomass carbon sequestration（P＜0.05） were found. Thus，for scientific management and for global warming mitigation，fertilization （at the rate of 0 － 270 gstem-1） could be beneficial for promoting growth of E. grandis，and increasing biomass，biomass carbon sequestration，and root-shoot ratio（R/S）.［Ch，4 fig. 36 ref.］
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Key words:
- forest ecology /
- fertilization /
- Eucalyptus grandis /
- growth /
- biomass carbon sequestration
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2011.02.006
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