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摘要: 草地生物量大部分集中在地下，地下生物量对于估算草地生态系统碳储量及其碳固持效应都至关重要。由于草地地下生物量数据缺乏，利用地下与地上的根冠比（R/S）或者地下与地上生物量的关系对草地地下生物量进行估算，是目前最常用的方法。本文在综述草地生物量研究进展的同时，利用2004~2010年已发表文献的草地生物量数据对中国不同类型草地的根冠比进行了探索，同时分析了不同类型草地的地上与地下生物量的相关关系（高寒草甸、高寒草原、山地草甸、温性草甸草原、温性草原和温性荒漠草原）。分析结果表明：不同类型草地的根冠比存在显著差异（F=3.524，ppR2=0.67）>温性荒漠草原（R2=0.36）>高寒草甸（R2=0.13），其他3种类型草地几乎不存在地上与地下生物量的相关关系。这为以后估算地下生物量提供依据，即地下生物量估算应该综合考虑根冠比和地下与地上生物量关系。Abstract: Large grassland biomass stores in belowground which plays a significant role in ecosystem carbon store and carbon sequestration. Due to the lack of below-ground biomass data Root:shoot ratio(R/S)or the relationship between above-ground biomass(AGB)and below-ground biomass(BGB)have been used to estimate below-ground biomass. By available published grassland biomass data in 2004~2010 the paper explored the R/S and the relationship between above- and below-ground biomass in six grassland types such as alpine meadow alpine steppe temperate desert steppe temperate meadow steppe montane meadow temperate steppe. The results showed that R/S was significantly different in all grassland types(F=3.542 ppR2=0.67)>temperate desert steppe(R2=0.36)>alpine meadow(R2=0.13). The power function fitted well with the relationship between BGB and AGB for these three types of grassland. The relationship between above-and below-ground biomass was not found in other three types of grassland. It was evident that both R/S and the relationship between AGB and BGB must be considered together when BGB was estimated.
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Key words:
- grassland /
- above-ground biomass /
- below-ground biomass /
- root：shoot ratio
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