JOURNAL OF NATURAL RESOURCES ›› 2018, Vol. 33 ›› Issue (2): 185-194.doi: 10.11849/zrzyxb.20161402

• Resource Ecology •     Next Articles

Characteristics of Biomass Carbon Density of Degraded Natural Grassland and Artificial Grassland in the “Three-River Headwaters” Region

ZHANG Rui1, 2, 3, LI Fei3, WANG Yuan3, MA Li-na4, SANG Chao4, WANG Li4, GUO Rui-ying3, ZHAO Xue-yong1, SHANG Zhuan-huan3   

  1. 1. Naiman Desertification Research Station, Urat Desert-grassland Research Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. School of Life Sciences, State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University, Lanzhou 730000, China;
    4. State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
  • Received:2016-12-19 Revised:2017-03-11 Online:2018-02-23 Published:2018-02-23
  • Supported by:
    National Key Research and Development Projects of China, No. 2016YFC0501906National Natural Science Foundation of China, No. 41671508 and 41541003Qinghai Key R ɭ and Transformation Program, No. 2017-NK-149-2. ]

Abstract: Biomass carbon density is one of the important features of carbon sequestration ability in ecological system. To describe the characteristics of biomass carbon density in alpine grassland in the “Three-River Headwaters” region, above ground biomass, living root biomass, dead root biomass and their carbon content in black soil land and natural grassland were measured. The results showed that the aboveground biomass in black soil land was higher than the aboveground biomass in degraded artificial grassland and natural grassland; but the living root biomass and dead root biomass in black soil land were lower than the living root biomass in degraded artificial grassland and natural grassland. The total biomass carbon density in degraded artificial grassland, black soil land and natural grassland was 719.47, 706.57 and 2 233.09 g/m2, respectively. Grassland degradation not only changed ecosystem biomass allocation, but also changed the carbon density distribution in aboveground vegetation, living roots and dead roots. Root carbon density in degraded artificial grassland and natural grassland accounted for more than 90% of the total biomass carbon density, while the roots carbon density in black soil land accounted for 79.41%. The variation of carbon density in living roots was greater than those in aboveground vegetation and dead roots among three types of grassland, therefore, we initially considered that living roots carbon density may be a sensitive indicator of grassland degradation.

Key words: “Three-river Headwaters ”region, biomass carbon density, black soil land, degraded artificial grassland, natural grassland

CLC Number: 

  • S812