河北塞罕坝樟子松人工林生长及碳储量的变化

doi:10.17521/cjpe.2017.0060

摘要/Abstract

摘要：

樟子松(Pinus sylvestris var. mongolica)作为华北地区重要的造林树种, 其生长及固碳特征的研究对樟子松人工林经营有着重要的意义。该文通过2006-2016年10年的定点观测, 研究河北省塞罕坝林场樟子松人工林的生长和固碳特征。结果表明: 10年间樟子松人工林胸径年增长4.19%, 树高年增长1.97%; 林木死亡率8.39%。该林分2006年和2016年的碳储量分别为59.04和109.64 t?hm^-2, 即10年间固碳量为50.6 t?hm^-2, 固碳年平均增长8.57%。不同径级的林木固碳能力有差异, 0-10 cm径级的林木总株数占39.1%, 但固碳量仅占8.3%; 10-20 cm径级的林木株数占59.2%, 固碳量占比达87.1%。结果显示樟子松人工林具有较大的固碳潜力, 未来评估林分生态效益与固碳潜力时, 应充分考虑林分的结构特征。

关键词: 樟子松人工林, 生长特征, 径级结构, 碳储量

Abstract:

Aims Pinus sylvestris var. mongolica is one of the main afforestation tree species in North China. It is important to study the characters of growth and carbon (C) sequestration, which can provide scientific basis for the sustainable management. Therefore, our study aims at quantifying the growth characters and C sequestration in these middle-aged plantations, and to investigate the effect of diameter at breast height (DBH) on those dynamics. Methods We selected a middle-aged P. sylvestris var. mongolica plantation as our permanent experimental plot, which is located in Saihanba, Hebei Province, China. DBH and height of all stands in this plot were measured in 2006 and 2016. Based on the anatomical trees and allometric equation, we calculated C density and sequestration from 2006 to 2016. We also analyzed C sequestration in different DBH groups in the study area. Important findings Our results showed that the carbon sink of those middle-age (age between 28 and 38 years old) plantation would be enhanced in future, and there were differences in characters of growth and C sequestration among DBH groups. The decadal increment rate of DBH and height were 4.19% and 1.97%, and the increment rate was the lowest in the 0-10 cm DBH class. The mortality rate of the plantation was 8.39%, with 7.82% mortality occurred in 0-10 cm tree size class. The forest stands biomass carbon stocks in 2006 and 2016 were 59.04 and 109.64 t?hm^-2, respectively, and almost 87.1% of the carbon stocks were in the middle DBH-class, even though the number of trees only accounted for nearly 59.2%. The small class’s number of trees accounted for 39.1%, while the carbon stocks accounted for 8.3%. Our results also demonstrate that forests in Saihanba would continue to act as a carbon sink in the coming years. The variations among DBH groups highlights that the diameter class should be taken into consideration while assess the ecological efficiency and carbon sequestration capacity in a certain area.

Key words: Pinus sylvestris var. mongolica plantation, growth character, diameter class, carbon sequestration

邢娟, 郑成洋, 冯婵莹, 曾发旭. 河北塞罕坝樟子松人工林生长及碳储量的变化. 植物生态学报, 2017, 41(8): 840-849. DOI: 10.17521/cjpe.2017.0060

Juan XING, Cheng-Yang ZHENG, Chan-Ying FENG, Fa-Xu ZENG. Change of growth characters and carbon stocks in plantations of Pinus sylvestris var. mongolica in Saihanba, Hebei, China. Chinese Journal of Plant Ecology, 2017, 41(8): 840-849. DOI: 10.17521/cjpe.2017.0060

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https://www.plant-ecology.com/CN/Y2017/V41/I8/840

图/表 8

参考文献 43

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树种 Species	器官 Organ	生物量方程 Formulate for biomass
樟子松	树干 Stem	W = 0.039 × (D²H)^0.888
Pinus sylvestris var. mongolica	树枝 Branch	W = 0. 047 × (D²H)^0.705
	树叶 Foliage	W = 0.075 × (D²H)^0.404
	树根 Root	W = 0.012 × (D²H)^0.873
落叶松	树干 Stem	W = 0.065 × (D²H)⁰⁷⁹³
Larix principis-rupprechtii	树枝 Branch	W = 0.052 × (D²H)^0.679
	树叶 Foliage	W = 0.139 × (D²H)^0.457
	树根 Root	W = 0.023 × (D²H)^0.75

树种 Species	器官 Organ	生物量方程 Formulate for biomass
樟子松	树干 Stem	W = 0.039 × (D²H)^0.888
Pinus sylvestris var. mongolica	树枝 Branch	W = 0. 047 × (D²H)^0.705
	树叶 Foliage	W = 0.075 × (D²H)^0.404
	树根 Root	W = 0.012 × (D²H)^0.873
落叶松	树干 Stem	W = 0.065 × (D²H)⁰⁷⁹³
Larix principis-rupprechtii	树枝 Branch	W = 0.052 × (D²H)^0.679
	树叶 Foliage	W = 0.139 × (D²H)^0.457
	树根 Root	W = 0.023 × (D²H)^0.75

树种 Species	2006年			2016年			年均增幅 Annual increment rate (%)
树种 Species	密度 Density (stems?hm^-2)	胸径 DBH (cm)	树高 Tree height (m)	密度 Density (stems?hm^-2)	胸径 DBH (cm)	树高 Tree height (m)	胸径 DBH	树高 Tree height (m)
樟子松 Pinus sylvestris var. mongolica	2 900	10.95 ± 3.53	8.74 ± 1.54	2 625	15.56 ± 6.29	10.62 ± 2.22	4.21	2.15
落叶松 Larix principis-rupprechtii	669	12.29 ± 4.34	9.49 ± 2.08	650	17.18 ± 6.54	10.67 ± 2.66	3.98	1.24
林分 Stand	3 569	11.19 ± 3.73	8.88 ± 1.68	3 275	15.88 ± 6.37	10.63 ± 2.37	4.19	1.97

树种 Species	2006年			2016年			年均增幅 Annual increment rate (%)
树种 Species	密度 Density (stems?hm^-2)	胸径 DBH (cm)	树高 Tree height (m)	密度 Density (stems?hm^-2)	胸径 DBH (cm)	树高 Tree height (m)	胸径 DBH	树高 Tree height (m)
樟子松 Pinus sylvestris var. mongolica	2 900	10.95 ± 3.53	8.74 ± 1.54	2 625	15.56 ± 6.29	10.62 ± 2.22	4.21	2.15
落叶松 Larix principis-rupprechtii	669	12.29 ± 4.34	9.49 ± 2.08	650	17.18 ± 6.54	10.67 ± 2.66	3.98	1.24
林分 Stand	3 569	11.19 ± 3.73	8.88 ± 1.68	3 275	15.88 ± 6.37	10.63 ± 2.37	4.19	1.97

树种 Species	年份 Year	胸径 DBH (cm)		树高 Tree height (m)
树种 Species	年份 Year	总生长量 Total increment	年生长量 Annual increment	总生长量 Total increment	年生长量 Annual increment
樟子松 Pinus sylvestris var. mongolica	2006	10.95	0.456	8.74	0.257
樟子松 Pinus sylvestris var. mongolica	2016	15.56	0.458	10.62	0.312
落叶松 Larix principis- rupprechtii	2006	12.29	0.512	9.49	0.279
落叶松 Larix principis- rupprechtii	2016	17.18	0.505	10.67	0.314
林分 Stand	2006	11.19	0.466	8.88	0.261
林分 Stand	2016	15.88	0.467	10.63	0.313