Spatial Variation of Leaf Chlorophyll in Northern Hemisphere Grasslands
Autor: | Yao Zhang, Ying Li, Ruomeng Wang, Li Xu, Mingxu Li, Zhaogang Liu, Zhenliang Wu, Jiahui Zhang, Guirui Yu, Nianpeng He |
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Rok vydání: | 2020 |
Předmět: |
0106 biological sciences
Chlorophyll a 010504 meteorology & atmospheric sciences spatial variation Plant Science lcsh:Plant culture influencing factors Biology 01 natural sciences Grassland chemistry.chemical_compound Dry weight allocation lcsh:SB1-1110 chlorophyll Transect Original Research 0105 earth and related environmental sciences geography geography.geographical_feature_category Plateau leaf nitrogen Agronomy Productivity (ecology) chemistry Photosynthetically active radiation Chlorophyll trait distribution grassland 010606 plant biology & botany |
Zdroj: | Frontiers in Plant Science Frontiers in Plant Science, Vol 11 (2020) |
ISSN: | 1664-462X |
Popis: | Chlorophyll is the molecular basis for the function of photosystems and is also a promising tool for ecological prediction. However, the large-scale patterns of chlorophyll variation in grasslands remain poorly understood. We performed consistent measurements of chlorophyll a, b, a+b, and the a:b ratio (chlorophyll a/b) for 421 species across northern hemisphere grassland transects, recorded their distributions, variations, and influencing factors, and examined their relationships with leaf nitrogen. The results showed that the distributional ranges were 0.52–28.33 (mean 5.49) mg·g−1 dry weight, 0.15–12.11 (mean 1.83) mg·g−1 dry weight, 0.67–39.29 (mean 7.32) mg·g−1 dry weight, and 1.28–7.84 (mean 3.02) for chlorophyll a, b, a+b, and a/b, respectively. The chlorophyll averages differed among regions (higher in the Loess Plateau and the Mongolian Plateau than in the Tibetan Plateau), grassland types (desert grasslands > meadow > typical grasslands), life forms, life spans, and taxonomies. In the entire northern hemisphere grassland, chlorophyll concentrations and chlorophyll a/b were negatively correlated to photosynthetically active radiation and the soil N:P ratio, and positively correlated to the mean annual temperatures. These results implied that chlorophyll in grasslands was shaped by the layered structure of grasses, distinct plateau environments, and phylogeny. The allocation patterns of leaf nitrogen to chlorophyll differed among regions and grassland types, showing that caution is required if simply relating single leaf N or chlorophyll to productivity separately. These findings enhance our understanding of chlorophyll in natural grasslands on a large scale, as well as providing information for ecological predictive models. |
Databáze: | OpenAIRE |
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