SUN Meimei,SONG Bianlan,SHI Weiyu,et al.Characteristics of Carbon Sink in Black Locust Plantation and Oak Natural Secondary Forest in Loess Hilly Region[J].Research of Soil and Water Conservation,2020,27(02):55-61.
黄土丘陵区刺槐、辽东栎林生态系统碳汇功能特征
- Title:
- Characteristics of Carbon Sink in Black Locust Plantation and Oak Natural Secondary Forest in Loess Hilly Region
- 文章编号:
- 1005-3409(2020)02-0055-07
- 分类号:
- S718.5
- 文献标志码:
- A
- 摘要:
- 保护自然植被和营造人工植被是黄土高原植被恢复的重要措施,为定量阐明该区域典型植被类型的生态服务功能,合理评估不同恢复植被措施的生态效益,选取了两种典型森林生态系统(刺槐人工林和辽东栎天然次生林),基于多年连续调查数据分析了其碳汇功能特征。采用以胸径和树高为基础变量的生物量方程估算了乔木层生物量; 采用样方收获法测算了灌木、草本和凋落物现存量; 依据两次样地调查的数据(间隔9年)和连续多年凋落物收集的数据,估算了两种森林生态系统的净初级生产力和固碳速率; 再结合对两种林地土壤CO2排放的监测与分析结果进一步估算了两种生态系统的碳汇功能。结果表明:刺槐林的生物量碳密度(67.63 t C/hm2)略低于辽东栎林(76.85 t C/hm2),林分内各组分碳密度仅在乔木叶部分差异显著。研究期间刺槐林和辽东栎林的生物量年均增长量分别为15.20,18.21 t/(hm2·a); 植被层年均固碳量分别为7.57,8.91 t C/(hm2·a)。因刺槐林地的土壤异养呼吸速率低于辽东栎林地,故其碳汇功能相对较高。
- Abstract:
- Protecting natural vegetation and establishing artificial vegetation are important measures for vegetation restoration in the Loess Plateau. To quantitatively evaluate the ecological services and benefits of different vegetation restoration measures in this area, we investigated the characteristics of carbon sink in two typical forest ecosystems, a plantation of black locust(Robinia pseudoacacia)and a natural secondary oak(Quercus liaotungensis)forest. The status of biomass carbon and its annually balance in the two forest ecosystems were estimated based on successive survey data for multiple years. Tree biomass including stems, branches, leaves, and roots was estimated by using the allometric biomass equations previously constructed based on diameter at breast height and tree height. Biomass of shrubs, herbs, and litter was estimated by harvesting small subplots. Biomass carbon sequestration rate and net primary productivity were calculated according to the data of twice plot surveys of nine-year interval and litter collections of successive years. In addition to the measurements and the projected results for soil CO2 emissions, the carbon sink functions of the two ecosystems were evaluated. The results showed that the biomass carbon density in black locust plantation(67.63 t C/hm2)was slightly lower than that in oak forest(76.85 t C/hm2), and the differences in carbon density of corresponding components between the two forest types were not statistically significant except for that in the tree leaves; the annual increments of biomass in black locust plantation and oak forest were 15.20 and 18.21 t/(hm2·a), respectively, and the annual carbon sequestration rates in the vegetation layer were about 7.57 and 8.91 t C/(hm2·a), respectively; meanwhile, as soil heterotrophic respiration rate in black locust plantation was lower than that in oak forest, the carbon sink function of black locust plantation was relatively higher.
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备注/Memo
收稿日期:2019-04-22 修回日期:2019-06-02 资助项目:国家重点研发计划项目(2017YFC0504601); 国家自然科学基金(41411140035,41171419) 第一作者:孙美美(1991—),女,河南洛阳人,博士研究生,研究方向为森林生态、流域生态与管理。E-mail:sunmeimei2014@126.com 通信作者:杜盛(1965—),男,内蒙古鄂尔多斯人,博士,研究员,主要从事森林生态、流域生态与管理研究。E-mail:shengdu@ms.iswc.ac.cn