基于植被盖度和高度的不同退化程度高寒草地地上生物量估算

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

摘要/Abstract

摘要： 由于气候变化和不合理的人类活动，20世纪80年代以来青藏高原高寒草地发生严重退化。地上生物量是评价草地退化的直观指标。通常采用植被盖度和高度来估算草地地上生物量，但草地退化后，植被盖度和高度与地上生物量之间的关系是否会发生变化目前还不清楚，这影响着退化草地生物量估算的精度。通过多元回归分析研究了青藏高原中部和东北部高寒草甸、高寒草原在不同退化程度下植被盖度和高度与地上生物量的关系。结果表明：（1）高寒草甸与高寒草原地上生物量整体上及不同退化阶段都没有显著差异（P>0.05）。（2）随着退化程度的加剧植被盖度和高度对地上生物量的影响也发生改变，体现在未退化阶段地上生物量主要受植被高度影响，退化后主要受植被盖度影响。（3）无论是高寒草甸还是高寒草原分退化程度的回归模型估算结果都较不分退化程度模型估算的生物量更接近实测值。我们建议在退化高寒草地研究中采用盖度和高度估算生物量时，根据退化阶段采用不同的估算模型。

关键词: 高寒草地, 植被特征, 地上生物量, 回归模型, 退化

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

中图分类号:

Q948

赖炽敏, 赖日文, 薛娴, 李成阳, 尤全刚, 黄翠华, 彭飞. 基于植被盖度和高度的不同退化程度高寒草地地上生物量估算[J]. 中国沙漠, 2019, 39(5): 127-134.

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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