| 摘要: |
| 为探究林龄和潮位对无瓣海桑 Sonneratia apetala 生态系统碳储量的影响, 文章以广东省珠海市淇
澳岛自然保护区的无瓣海桑人工林为研究对象, 选择滩涂、 高潮位无瓣海桑林 (2002 年种植, 18 a)、 低潮
位无瓣海桑林 (2002 年种植, 18 a)、 低潮位无瓣海桑林 (2008 年种植, 12 a), 分别测定生物量和
0~100 cm 土层土壤的有机碳含量、 氮磷硫含量、 微生物碳含量, 以及理化因子如 pH、 盐度、 容重。 结果表
明, 18 a 低潮位无瓣海桑植物生物量 ((297. 06 ± 18. 92) Mg ·hm
-2
)、 土壤碳储量 (( 184. 97 ± 2. 45)
Mg·hm
-2
) 和生态系统碳储量 ((312. 77±10. 59) Mg·hm
-2
) 均显著高于 12 a 低潮位无瓣海桑 (分别为
(210. 68±4. 80)、 (137. 86±10. 31) 和 (228. 49±12. 37) Mg·hm
-2
, P＜0. 05), 林龄的增加显著提高了植物
生物量以及土壤碳的碳氮比, 表明红树林源碳对土壤碳的贡献比例明显增大。 18 a 高潮位无瓣海桑的生态系
统碳储量 (347. 66±39. 46 Mg·hm
-2
) 显著高于 18 a 低潮位无瓣海桑 (P＜0. 05), 可能由于高潮位无瓣海
桑林经受低强度的潮汐作用以及较弱的微生物分解作用。 因此, 林龄和潮位对生态系统碳储量均有显著性影
响, 而无瓣海桑因其较低的碳氮比, 可能会不利于土壤碳的累积, 同时因无瓣海桑具有潜在的入侵风险, 不
适宜作为本土红树林退化区生态修复的工具种。 |
| 关键词: 无瓣海桑 红树林 碳储量 潮位 林龄 |
| DOI： |
| 分类号: |
| 基金项目:广东省林学会科技计划项目 (2021-GDFS-KJ-07), 广东省林业科技创新项目 ( 2024KJCX001), 省级温室气体清单编 制项目 (STQH-2021-050) |
|
| Comparison of Carbon Stock of Sonneratia apetala Ecosystem under Different Forest Ages and Tidal Levels |
|
HU Naxu1, FENG Jianxiang2,3, ZHAO Zhigang4, LI xiaomei5, Wei Long5
|
|
1.School of Eco-Environment Technology, Guangdong Industry Polytechnic;2.School of Marine Sciences, Sun Yat-sen University;3.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai);4.Guangzhou Institute of Forestry and Landscape Architecture / Guangzhou Collaborative Innovation Center on Science-tech of Ecology and landscape;5.Guangdong Academy Of Forestry
|
| Abstract: |
| To investigate the effects of forest age and tidal level on the carbon stock of Sonneratia apetala
ecosystem, the artificial forest of S. apetala in Qi′ao Island Nature Reserve of Zhuhai city, Guangdong province
was selected as the research object. The four sites were mudflat, high tidal level S. apetala forest ( planted in
2002, 18-year-old), low tidal level S. apetala forest (planted in 2002, 18-year-old), and low tidal level
S. apetala forest (planted in 2008, 12-year-old). The biomass, soil organic carbon content, nitrogen, phosphorus and sulfur contents, microbial carbon, and physical and chemical factors such as pH, salinity, and bulk
density of 0-100 cm were measured. The results showed that the plant biomass ((297. 06±18. 92) Mg·hm
-2
),
soil carbon stock ((184. 97±2. 45) Mg·hm
-2
), and ecosystem carbon stock ((312. 77±10. 59) Mg·hm
-2
)
of low tidal level S. apetala at 18-year-old were significantly higher than those of high tidal level S. apetala at
12-year-old ((210. 68±4. 80), (137. 86±10. 31) , and (228. 49±12. 37) Mg·hm
-2
) , respectively, P＜
0. 05) . The increase in forest age can significantly increase plant biomass and the contribution ratio of mangrove
source carbon to soil carbon. The ecosystem carbon stock ((347. 66±39. 46) Mg·hm
-2
) of S. apetala at the
18-year-old high tide level was significantly higher than that of S. apetala at the 18-year-old low tidal level
(P＜0. 05), which might be attributed to the low tidal erosion and microbial decomposition of S. apetala forest
at the high tidal level. Therefore, both forest age and tidal level have significant effects on ecosystem carbon
stock, while the S. apetela may not be conducive to the accumulation of soil carbon due to its low C ∶ N ratio.
Meanwhile, due to its potential invasive risk, the S. apetela is not suitable as a tool species for ecological restoration for degraded mangrove forests. |
| Key words: Sonneratia apetala mangrove carbon stock tidal level forest age |
