期刊
ECOLOGY LETTERS
卷 21, 期 6, 页码 885-895出版社
WILEY
DOI: 10.1111/ele.12956
关键词
asterids; biomass; dicots; leaf dry matter content; leaf economics spectrum; monocots; nitrogen; phosphorus; rosids; rumen liquor
类别
资金
- Strategic Research Programme of the Scottish Government's Rural and Environment Science and Analytical Services Division
- [RPV SP/2D3/179/07]
- [CIGA 42110/1313/3114]
- [MSM6215648905]
Plant variation in nutrient concentrations encompasses two major axes. The first is connected to nitrogen (N) and phosphorus (P), reflects growth rate and has been designated as the leaf economics spectrum (LES) while the second follows the gradient in calcium (Ca) and magnesium (Mg) and mirrors cell structural differences. Here, we tested in grasslands whether the sum Ca + Mg concentrations is a better indicator of digestibility than LES constituents. Structural equationmodelling revealed that the total effect size of N (0.30) on digestibility was much lower than that of Ca + Mg (0.58). The N effect originated predominantly from sampling date (biomass ageing), while the Ca + Mg effect largely from phylogenetic composition (proportion of monocots). Thus, plant variation in partially substitutable divalent cations seems to play a significant role in biomass digestion by ruminants. This finding contests, together with litter decomposition studies, the prominent role of the LES for understanding both fundamental ecological processes.
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