陇东黄土高原沟壑区刺槐和油松人工林的生物量和碳密度及其分配规律

doi:10.11707/j.1001-7488.20150401

Abstract

Abstract:

【Objective】Based on data obtained from a survey of sample plots of Robinia pseudoacacia and Pinus tabulaeformis plantations in Loess gullies in eastern Gansu, the biomass, carbon concentration, carbon density and patterns of their distribution were analyzed, in order to provide the basic data for estimation of carbon benefits of the plantations in the area.【Method】12-year-old plantations of R. pseudoacacia and P. tabulaeformis in Loess gullies in eastern Gansu were measured through survey of sample plots and actual measurements of biomass, in order to study biomass production of different tree organs, shrub & grass layer and litter layer; carbon storage and its allocation in the layers of tree, shrub, grass, litter and soil.【Result】The mean carbon content in the tree layer of R. pseudoacacia plantation(468.44 g ·kg^-1)was less than that of P. tabulaeformis(512.77 g ·kg^-1). The carbon content among various tree organs of R.pseudoacacia varied from 458.00 g ·kg^-1 to 496.96 g ·kg^-1, in an order: stem > branch > leaf > root > bark. The carbon content among various tree organs of P.tabulaeformis ranged from 503.83 g ·kg^-1to 536.27 g ·kg^-1, in an order: stem > leaf > branch > bark > root. The mean carbon contents of R. pseudoacacia in different layers were: herb (390.52 g ·kg^-1), shrub (39 8.72 g ·kg^-1), litter (402.82 g ·kg^-1);The mean carbon contents of P. tabulaeformis in different layers were: herb (413.17 g ·kg^-1), shrub (436.85 g ·kg^-1), litter (414.03 g ·kg^-1). The carbon content in soil layer decreased with soil depth, and the carbon content was higher in surface soil layer (0-10 cm) than in the other layers;The mean carbon content in 0-50 cm soil layer of R. pseudoacacia (4.96 g ·kg^-1) was higher than that of P. tabulaeformis forests (4.45 g ·kg^-1). The total biomass of vegetation layer of R. pseudoacacia was 54.80 t ·hm^-2, of which Arbor layer, herb layer and shrub layer accounted for 95.88%, 2.65%, 1.46%; The total biomass of vegetation layer of P. tabulaeformis was 24.37 t ·hm^-2, of which arbor layer, herb layer, shrub layer accounted respectively for 93.43%, 5.17%, and 1.40%. The biomass and carbon density of the litter layer of R. pseudoacacia was 1.36 t ·hm^-2, 0.55 t ·hm^-2, accounting for 2.48%, 2.12% of the vegetation layer; The biomass and carbon density of P. tabulaeformis was 0.92 t ·hm^-2, 0.39 t ·hm^-2, accounting for 3.78%, 3.09% of the vegetation layer. The soil carbon density of R. pseudoacacia and P. tabulaeformis were 31.15 t ·hm^-2 and 24.35 t ·hm^-2. The carbon density was higher in the soil layer of 0-10 cm, accounting for 40.19% and 38.73%.And the carbon density of their ecosystem were 57.60 and 37.38 t ·hm^-2, and their distribution were: soil layer > vegetation > litter layer. 【Conclusion】The vegetation biomass of R. pseudoacacia and P. tabulaeformis was in the order: Arbor layer > herb layer > shrub layer, and the stem was the largest of the Arbor layer, accounting for 40.02%, 37.29%. Results indicated that most ecosystem carbon density of two plantations stored in soil and vegetation, carbon sequestration ability of R. pseudoacacia was higher compared to P. tabulaeformis plantation.

Key words: Robinia pseudoacacia plantation, Pinus tabulaeformis plantation, biomass, carbon density, loess gully region, eastern Gansu

CLC Number:

S718.5

Shen Jiapeng, Zhang Wenhui, Li Yanhua, He Jingfeng, Zhang Hui. Biomass and Carbon Density and Patterns of Their Distribution in the Plantations of Robinia pseudoacacia and Pinus tabulaeformis in Loess Gullies in Eastern Gansu[J]. Scientia Silvae Sinicae, 2015, 51(4): 1-7.

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Biomass and Carbon Density and Patterns of Their Distribution in the Plantations of Robinia pseudoacacia and Pinus tabulaeformis in Loess Gullies in Eastern Gansu

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