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巨桉混交林不同树种C、N、P化学计量特征

陈亚梅,刘洋**,张健,杨万勤,纪托未   

  1. (四川农业大学生态林业研究所, 林业生态工程重点实验室, 长江上游生态安全协同创新中心, 成都 611130)
  • 出版日期:2015-08-10 发布日期:2015-08-10

Stoichiometric characteristics of carbon, nitrogen and phosphorus of different tree species in Eucalyptus grandis mixed plantation.

CHEN Ya-mei, LIU Yang**, ZHANG Jian, YANG Wan-qin, JI Tuo-wei   

  1. (Institute of Ecology and Forestry, Sichuan Agricultural University, Key Laboratory of Forestry Ecological Engineering in Sichuan Province, Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River, Chendu 611130, China)
  • Online:2015-08-10 Published:2015-08-10

摘要:

以巨桉人工混交林不同树种为研究对象,分析了巨桉及伴生树种红椿、台湾桤木、檫木的叶片、凋落叶和相应土壤的C、N、P化学计量特征。结果表明:不同树种叶片、凋落叶、土壤N∶P分别为6.7~9.7、8.6~9.7和1.6~4.0,C∶N分别为29.6~62.8、78.4~101.8和15.3~19.5,C∶P分别为279.9~459.3、639.0~795.9和24.9~77.6;4个树种中,檫木具有最高的C储存能力和N、P利用效率;伴生树种凋落叶的C∶N、C∶P低于巨桉,说明伴生树种凋落叶的可分解性更强,引入伴生树种会加快混交林的N、P循环速率;所有树种叶片N∶P<10,说明混交林4个树种较大程度上受N限制且巨桉受N限制的情况更突出,混交林中不同树种土壤N、P含量及化学计量特征具有显著的差异,引入伴生树种可改变巨桉人工林生态系统的养分循环;随着林龄的增加,伴生树种在巨桉人工林生态系统养分循环中的正效应会体现得更加明显。
 

关键词: 小粒咖啡, 遮荫, 产量, 亏缺灌溉, 水光耦合

Abstract:

We explored the C, N, P stoichiometry of fresh leaf, leaf litter and soil in Eucalyptus grandis mixed plantation of Toona ciliate, Alnus formosana, Sassafras tzumu and E. grandis. The results showed that the N∶P ratios of fresh leaf, leaf litter and soil ranged from 6.7 to 9.7, 8.6 to 9.7, 1.6 to 4.0, respectively. For the same components above, the C∶N ratios were 29.6 to 62.8, 78.4 to 101.8, 15.3 to 19.5, and the C∶P ratios ranged from 279.9 to 459.3, 639.0 to 795.9, 24.9 to 77.6, respectively. Among the four tree species, S. tzumu had the highest C storage capacity and N, P utilization efficiency. The leaf litter C∶N and C∶P of the three associated tree species were lower than that of E. grandis, suggesting that the leaf litter of the associated tree species was more easily decomposed and the associated trees may accelerate N, P cycling rates in the mixed forest. According to the fresh leaf N∶P <10, we found that E. grandis mixed plantation was considerably limited by N element, and E. grandis was limited more seriously. There were significant differences of soil N, P contents and C∶N∶P among different tree species, indicating that N, P cycling of Eucalyptus grandis plantation could be changed by the introduction of associated tree species. Moreover, the benefits of associated tree species in mixed plantation ecosystem will increase with forest age.

 

Key words: shading, yield, Coffea arabica, deficit irrigation, water and radiation coupling.