Estimation of Aboveground Biomass of Different Degraded Alpine Grassland Based on Vegetation Coverage and Height

doi:10.7522/j.issn.1000-694X.2018.00126

Journal of Desert Research ›› 2019, Vol. 39 ›› Issue (5): 127-134.DOI: 10.7522/j.issn.1000-694X.2018.00126

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Estimation of Aboveground Biomass of Different Degraded Alpine Grassland Based on Vegetation Coverage and Height

Lai Chimin^1,2, Lai Riwen¹, Xue Xian², Li Chengyang^2,3, You Quangang², Huang Cuihua², Peng Fei²

1. College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350000, China;
2. Key Laboratory of Desert and Desertification, Northwest Institute of Ecology and Environmental Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-07-20 Revised:2018-10-18 Online:2019-09-29 Published:2019-09-29

Abstract

Abstract: Due to climate change and irrational human activities, severe degradation of the alpine grassland on the Tibetan Plateau has occurred since the 1980s.Aboveground biomass is one of the most intuitive indicators of grassland degradation. Vegetation coverage and height are commonly used to estimate grassland biomass, but it is unclear whether the relationship between coverage and height and aboveground biomass will maintain after degradation, which affects the accuracy of the estimation of degraded grassland biomass. The relationship between vegetation coverage and height, and the aboveground biomass of alpine meadow and alpine steppe in the central and northeastern Tibetan Plateau under different degraded were studied by multiple regression analysis. Our results show that:(1)aboveground biomass had no significant difference between alpine meadow and alpine steppe (P>0.05) in different degradation stages. (2) As the degree of degradation changes, the effects of vegetation cover and height on aboveground biomass also change. Aboveground biomass was mainly affected by vegetation height in the non-degraded stage and was mainly affected by vegetation coverage after degradation. (3)The aboveground biomass estimated with different models at various degradation stages is closer to the measured value than the biomass estimated by an overall model either in the alpine meadow or alpine steppe. Our results indicate that the estimation of aboveground biomass should be conducted for each degradation level rather than estimating the aboveground biomass using a general model for all levels.

Key words: alpine grassland, vegetation characteristics, aboveground biomass, regression model, degradation

CLC Number:

Q948

Lai Chimin, Lai Riwen, Xue Xian, Li Chengyang, You Quangang, Huang Cuihua, Peng Fei. Estimation of Aboveground Biomass of Different Degraded Alpine Grassland Based on Vegetation Coverage and Height[J]. Journal of Desert Research, 2019, 39(5): 127-134.

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Estimation of Aboveground Biomass of Different Degraded Alpine Grassland Based on Vegetation Coverage and Height

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