土地利用方式对荒漠草地生物量分配及碳密度的影响

doi:10.7522/j.issn.1000-694X.2015.00045

摘要/Abstract

摘要：

草地生态系统群落生物量的分配模式对于研究生态系统碳储量和碳循环有着重要的意义。为了解内蒙古荒漠草地群落生物量垂直分配格局,从不同土地利用方式着手探讨群落生物量不同成层性分配规律并估算荒漠草地生物量碳密度。结果表明:(1)人工灌溉草地灌木层生物量明显高于放牧和原生草地,草本层生物量表现出灌溉草地>原生草地>放牧草地,而凋落物层表现出灌溉草地<放牧草地<原生草地,地上生物量集中在草本层(60%以上),地下0~10 cm生物量大于其他层生物量(P<0.05)。(2)灌木层生物量、草本层生物量、凋落物层间存在极显著的相关关系(P<0.0001);地下各层生物量之间存在极显著相关关系(P<0.0001);且灌溉草地与原生草地群落地上层生物量与地下层生物量之间存在显著相关关系(P<0.05),故可以建立生物量成层性分配模型。(3)生物量碳密度原生草地<放牧草地<灌溉草地。

关键词: 土地利用方式, 生物量, 成层性分配, 碳密度, 荒漠草地

Abstract:

The allocation of community biomass is highly meaningful in research of carbon storage and cycling in grassland ecosystems. Our objective is to characterize biomass allocation patterns of desert grassland by providing a detailed study of stratose allocation and carbon density in different land-use types. The results showed that manual irrigation sample area Shrubs layer biomass was significantly higher than the grazing and original grass. The biomass of grass layer showed that manual irrigation grassland was over original grassland and grazing grassland, and original grassland was greater than grazing grassland, which the biomass of litter layer was opposite. Above-ground stratose biomass concentrated on grass layer (more than 60%) and below-ground 0-10 cm layer biomass was significantly greater than other layer biomass (P<0.05). There were extremely significant correlations (P<0.0001) among grass layer, litter layer, Shrubs layer biomass, between each layer of below-ground biomass. And the biomass of above- and below-ground stratose biomass were also significantly correlated (P<0.05) in original ecology sample area and manual irrigation sample area. So we could establish biomass stratose distribution model. The mean biomass carbon density of manual irrigation grassland was over original grassland and grazing grassland, and original grassland was greater than grazing grassland.

Key words: land-use type, biomass, stratose allocation, carbon density, desert grassland

中图分类号:

Q948.1

刘文亭, 卫智军, 吕世杰, 孙世贤, 代景忠. 土地利用方式对荒漠草地生物量分配及碳密度的影响[J]. 中国沙漠, 2016, 36(3): 666-673.

Liu Wenting, Wei Zhijun, Lv Shijie, Sun Shixian, Dai Jingzhong. Estimation of Biomass Stratose Allocation and Carbon Density in Different Land-use Types in Stipa breviflora Desert Grassland[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(3): 666-673.

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