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卢婵江,温远光,周晓果,朱宏光,莫继有,左花,严理,兰俊.不同轮伐期对巨尾桉人工林碳固存的影响[J].广西科学,2018,25(2):149-157. [点击复制]
- LU Chanjiang,WEN Yuanguang,ZHOU Xiaoguo,ZHU Hongguang,MO Jiyou,ZUO Hua,YAN Li,LAN Jun.Effects of Rotation Length on Carbon Sequestration in Eucalyptus grandis×E.urophylla Plantations[J].Guangxi Sciences,2018,25(2):149-157. [点击复制]
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| 不同轮伐期对巨尾桉人工林碳固存的影响 |
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卢婵江1, 温远光1, 周晓果1, 朱宏光1, 莫继有2, 左花1, 严理1, 兰俊2
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| (1.广西大学林学院, 广西森林生态与保育重点实验室培育基地, 广西南宁 530004;2.广西国有东门林场, 广西扶绥 532100) |
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| 摘要: |
| [目的]深入探讨不同轮伐期对巨尾桉人工林碳固存的影响,为从应对全球气候变化的视角确定合理轮伐期提供理论依据。[方法]以轮伐期为短(7 a)、中(13 a)和长周期(21 a)的巨尾桉人工林为研究对象,通过对不同轮伐期桉树林分生物量、碳固存、年平均固碳量的分析,揭示不同轮伐期对桉树林分碳固存的影响。[结果]巨尾桉人工林的生物量碳随着轮伐期的延长而逐渐增加,由7 a轮伐期的(75.81±5.12) t·C/hm2增至13 a轮伐期的(180.11±19.97) t·C/hm2以及21 a轮伐期的(192.08±16.50) t·C/hm2,方差分析表明,13 a和21 a轮伐期的总生物量碳显著高于7 a轮伐期,而13 a和21 a轮伐期之间的差异不显著。巨尾桉人工林土壤有机碳随轮伐期延长而显著降低,由7 a轮伐期的(89.99±0.35) t·C/hm2、13 a轮伐期的(85.42±0.76) t·C/hm2下降到21 a轮伐期的(74.64±0.24) t·C/hm2。7~13 a仍是巨尾桉人工林固碳能力迅速增长期,年平均总生物量碳由7 a时的10.78 t·C/(hm2·a)迅速提高到13 a的19.54 t·C/(hm2·a),增长81%;21 a时巨尾桉人工林进入固碳能力下降期,年平均总生物量碳降至3.78 t·C/(hm2·a),固碳能力只是13 a的19.34%。[结论]在南亚热带,巨尾桉人工林的最佳轮伐期确定在13 a左右较为适宜,这与经济效益的最大化一致。 |
| 关键词: 巨尾桉人工林 轮伐期 生物量碳 土壤有机碳 碳固存 |
| DOI：10.13656/j.cnki.gxkx.20180427.003 |
| 投稿时间：2018-01-29 |
| 基金项目:国家自然科学基金项目(31460121),广西高等学校重大科研项目(201201ZD001),广西森林生态与保育重点实验室培育基地开放课题(QZKFKT2017-01),广西林业厅科研项目(桂林科字[2009]第八号)和广西研究生教育创新计划项目(YCBZ2015016)资助 |
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| Effects of Rotation Length on Carbon Sequestration in Eucalyptus grandis×E.urophylla Plantations |
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LU Chanjiang1, WEN Yuanguang1, ZHOU Xiaoguo1, ZHU Hongguang1, MO Jiyou2, ZUO Hua1, YAN Li1, LAN Jun2
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| (1.Guangxi Key Laboratory of Forest Ecology and Conservation, Forestry College, Guangxi University, Nanning, Guangxi, 530004, China;2.Dongmen State Forest Farm of Guangxi, Fusui, Guangxi, 532100, China) |
| Abstract: |
| [Objective] The objective of this in-depth study was to provide theoretical foundation for confirming rational rotation length from the perspective of coping with global climate changes by investigating the effects of rotation length on carbon sequestration in Eucalyptus grandis×E.urophylla plantations.[Methods] The short-term (7 a), medium (13 a), and long (21 a) rotations of Eucalyptus grandis×E.urophylla plantations were studied.Through the analysis of biomass, carbon sequestration, and annual average carbon sequestration of E.grandis×E.urophylla plantations in different rotations, the effects of different rotations on carbon sequestration of E.grandis×E.urophylla plantations were revealed.[Results] With the extension of the rotation period, the biomass carbon sequestration of E.grandis×E.urophylla plantations sustainably increased.The biomass carbon sequestration increased from (75.81±5.12) t·C/hm2 in 7 a to (180.11±19.97) t·C/hm2 in 13 a, and slightly increased to (192.08±16.50) t·C/hm2 in 21 a.Results of ANOVA showed that the total biomass carbon sequestration of the 13 a and 21 a rotations were significantly higher than the 7 a rotation, while the difference between the 13 a and 21 a rotations was not significant.The soil organic carbon sequestration in the Eucalyptus grandis×E.urophylla plantations decreased significantly with the extension of the rotation period.The soil organic carbon sequestration decreased from (89.99±0.35) t·C/hm2 in 7 a and (85.42±0.76) t·C/hm2 in 13 a to (74.64±0.24) t·C/hm2 in 21 a.7~13 a was still a period of rapid growth of carbon sequestration capacity of Eucalyptus grandis×E.urophylla plantations, and the annual average total biomass carbon rapidly increased from 10.78 t·C/(hm2·a) in 7 a to 19.54 t·C/(hm2·a) in 13 a, which increased 81%.In 21 a, the Eucalyptus grandis×E.urophylla plantations entered a period of decline in carbon sequestration capacity, the annual average total biomass carbon fell to 3.78 t·C/(hm2·a), and the carbon sequestration capacity was only 19.34% of 13 a.[Conclusion] In the South Asian subtropics, the rotation period of the Eucalyptus grandis×E.urophylla plantations was determined to be appropriate around 13 years, This was accordance with the maximum of economic benefits. |
| Key words: Eucalyptus grandis×E.urophylla plantations rotation biomass carbon sequestration soil organic carbon carbon sequestration |
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