期刊
PLANTS-BASEL
卷 10, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/plants10122680
关键词
Qinghai-Tibetan Plateau; alpine meadow; carbon storage; biomass
资金
- National Science Foundation of China [31870380, 31200299]
Understanding carbon allocation in plants is crucial for explaining growth strategies during environmental adaptation. Research in the Qinghai-Tibetan Plateau found that non-structural carbohydrates, especially soluble sugars, play a significant role in below-ground growth patterns in meadow ecosystems, with degraded meadows intensifying this process.
Understanding carbon allocation in plants is essential for explaining their growth strategies during environmental adaptation. However, the role of mobile carbon in plant growth and its response to habitat conditions is still disputed. In degraded meadow (alpine sandy grassland) and non-degraded meadow (typical alpine meadow and swamp meadow) on the Qinghai-Tibetan Plateau, we measured the monthly averages of above-ground biomass (AGB) and below-ground biomass (BGB) of the investigated species in each meadow and the average concentration of non-structural carbohydrates (NSCs), an indicator of carbon storage. Below-ground organs had higher concentrations and showed more seasonal variation in NSCs than above-ground organs. BGB had a positive correlation with below-ground NSCs levels. However, AGB had no clear relationship with above-ground NSCs levels. Plants in sandy grasslands had higher total NSC, soluble sugars, fructose, and sucrose concentrations and lower starch concentrations in below-ground organs than plants in alpine or swamp meadows. Overall, NSCs storage, particularly soluble sugars, is a major process underlying the pattern of below-ground growth, but not above-ground growth, in the meadow ecosystem of the Qinghai-Tibetan Plateau, and degraded meadow strengthens this process. These results suggest that the extent of carbon storage in non-photosynthetic organs of alpine herbs impacts their growth and habitat adaptation.
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