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[1]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.

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Characteristics of Carbon Sink in Black Locust Plantation and Oak Natural Secondary Forest in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 27 Number of periods: 2020 02 Page number: 55-61 Column: Public date: 2020-03-30

Title:: Characteristics of Carbon Sink in Black Locust Plantation and Oak Natural Secondary Forest in Loess Hilly Region

Author(s):: SUN Meimei¹, SONG Bianlan², SHI Weiyu³, YAMANAKA Norikazu⁴, LI Guoqing², DU Sheng²; (1.College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling, Shaanxi 712100, China; 3.School of Geographical Science, Southwest University, Chongqing 400715, China; 4.Arid Land Research Center, Tottori University, Tottori 680—0001, Japan)

Keywords:: loess hilly region; net primary productivity; carbon sequestration rate; carbon sink

CLC:: S718.5

DOI:: -

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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Last Update: 2020-02-25