南京林业大学学报(自然科学版) ›› 2023, Vol. 47 ›› Issue (3): 225-233.doi: 10.12302/j.issn.1000-2006.202107035
收稿日期:
2021-07-24
修回日期:
2021-10-25
出版日期:
2023-05-30
发布日期:
2023-05-25
通讯作者:
宁卓
基金资助:
CHU Anting1(), NING Zhuo1,*(), YANG Hongqiang1,2
Received:
2021-07-24
Revised:
2021-10-25
Online:
2023-05-30
Published:
2023-05-25
Contact:
NING Zhuo
摘要:
【目的】在我国禁伐天然林的背景下,人工林的碳汇功能因为减缓气候变化方面的重要作用而备受关注。分析林业碳汇对我国人工林最优轮伐期的影响,为人工林碳汇经营的管理决策提供理论基础。【方法】以我国南方林区的杉木人工林和北方林区的落叶松人工林为研究对象,基于修正的Faustmann-Hartman模型,借助林木的生长模型和林业碳汇供给的计算模型,计算并比较不同经营目标下人工林的最优轮伐期和林地期望值。【结果】①无论树种和立地条件,将碳汇收益纳入经营目标都会增加林地期望值;②在碳价为35元/t、利率为5%时,将碳汇收益纳入林地经营目标,最优轮伐期有小于1 a的延长;只考虑碳汇收益时,人工林的碳汇收益随轮伐期的延长而增大;③碳价格在0~125元/t范围内变动时,杉木最优轮伐期有2~3 a的变动,落叶松最优轮伐期基本没有变化,最大林地期望值的变动均不明显。【结论】开展人工林的碳汇经营有利于林地投资。现有的经营强度和碳价格下,由于碳价格远远低于木材价格,将碳汇收益纳入林地经营目标时,林地经营者考虑的最优轮伐期不会有很大变化;只考虑碳汇收益时,以不砍伐森林的收益最大。碳价格在较低水平变动时,对人工林最优轮伐期的影响不显著。
中图分类号:
储安婷,宁卓,杨红强. 林业碳汇对人工林最优轮伐期的影响--以杉木和落叶松为例[J]. 南京林业大学学报(自然科学版), 2023, 47(3): 225-233.
CHU Anting, NING Zhuo, YANG Hongqiang. Effects of forest carbon sequestration on optimal rotation of plantations: a case study of Chinese fir and larch[J].Journal of Nanjing Forestry University (Natural Science Edition), 2023, 47(3): 225-233.DOI: 10.12302/j.issn.1000-2006.202107035.
表1
Discounted afforestation, harvesting and transportation costs of Chinese fir plantations under different site conditions in 2019单位:元/hm2"
立地条件 site conditions | 造林成本 reforestation cost | 采运成本 logging cost | 总成本 total cost | |||
---|---|---|---|---|---|---|
第1年 year 1 | 第2年 year 2 | 第3年 year 3 | 第4年 year 4 | 第T年 year T | ||
优等林地premium woodland | 11 913.84 | 2 202.41 | 2 129.38 | 1 765.88 | 138.21 | 16 604.18 |
中等林地medium woodland | 13 046.91 | 2 480.62 | 2 030.96 | 1 847.74 | 155.10 | 17 916.02 |
劣等林地inferior woodland | 13 654.39 | 4 899.78 | 2 835.87 | 1 675.44 | 171.39 | 21 234.54 |
表3
中国碳交易市场单日交易数据(2019年12月30日)"
碳交易市场 carbon trading market | 成交价/(元·t-1) transaction price | 成交量/t ttransaction volume |
---|---|---|
湖北Hubei | 27.31 | 143 655.0 |
上海Shanghai | 41.80 | 10 799.0 |
北京Beijing | 68.70 | 1 000.0 |
重庆Chongqing | 27.79 | 135 309.0 |
广东Guangdong | 28.01 | 105 160.0 |
天津Tianjin | 15.40 | 427.0 |
深圳Shenzhen | 7.85 | 0.5 |
福建Fujian | 14.00 | 0 |
表4
不同经营目标下杉木人工林的最优轮伐期和林地期望值"
立地条件 site conditions | 立地指数 SI | 情景1 section 1 | 情景3 section 3 | ||
---|---|---|---|---|---|
最优轮伐期/a optimal rotation period | 林地期望值/(元·hm-2) forest land expectation value | 最优轮伐期/a optimal rotation period | 林地期望值/(元·hm-2) forest land expectation value | ||
优等林地premium woodland | 16 | 18.23 | 83 020.65 | 18.61 | 84 057.95 |
中等林地medium woodland | 12 | 19.50 | 28 431.15 | 19.97 | 29 105.97 |
劣等林地inferior woodland | 8 | 23.04 | -6 367.84 | 23.58 | -6 014.15 |
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