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- W2100027303 abstract "Global warming and CO2 rise is expected to change the balance of C3 and C4 plants in grassland vegetation, but disturbance, including grazing, could also affect C3/C4 community structure. We used a six-year (2005–2010) grazing experiment to test the prediction that the relative abundance of C4 plants (PC4) in the semi-arid grassland of Inner Mongolia is related to growing-period temperature and disturbance by grazing. Paddocks were stocked with sheep at six rates (0.375–2.25 sheep ha−1 a−1) between June and September. PC4 was estimated from the relative 13C/12C composition (δ13C) of wool grown during the grazing period of each year and a two-member mixing model of the δ13C of the C3 and C4 communities in the paddocks. Stocking rate had a slight effect (<0.5‰) on the δ13C of the C3 and the C4 end-members. Annual average PC4 varied between 5% and 24%. Stocking rate had no significant effect on PC4 but the growing-season temperature had a large effect, and PC4 increased with temperature. Importantly, the growing season shifted between years due to changing seasonal distribution of rainfall and soil moisture availability from winter precipitation causing large variation in temperature of the effective growing season. Changes in temperature and in amount and seasonal distribution of rainfall as a consequence of inter-annual fluctuations and long-term change can thus have a large impact on the C4 abundance and its spatial pattern. Es ist zu erwarten, dass die globalen Zunahmen der Temperatur und der CO2-Konzentration das Verhältnis von C3 und C4 Pflanzen im Grasland beeinflussen, aber auch Störungen wie (Über-) Beweidung könnten auf das C3/C4-Verhältnis einwirken. Wir prüften mit einem sechsjährigen Weideexperiment mit sechs Besatzstärken (0.375 bis 2.25 Schafe ha−1 a−1) die Hypothese, dass der relative Anteil der C4-Pflanzen (PC4) im semi-ariden Grasland der Inneren Mongolei (China) von der Temperatur der Vegetationsperiode und vom Beweidungsdruck abhängt. PC4 wurde aus dem relativen 13C-Anteil (δ13C) der Wolle, die während der Weideperiode zwischen Juni und September gewachsen war, mit einem Mischungsmodell geschätzt. Die Besatzstärke beeinflusste dabei geringfügig (<0.5‰) die C3- und C4-Endglieder des Mischungsmodells. Im Parzellenmittel variierte PC4 zwischen 5% und 24% zwischen den Jahren. Die Besatzstärke hatte keinen Einfluss. PC4 nahm dagegen mit zunehmender Temperatur der Vegetationsperiode zu. Dabei musste aber berücksichtigt werden, dass die effektive Wachstumsperiode abhängig von der saisonalen Verteilung der Regen und dem Wasserangebot aus der Winterperiode von Jahr zu Jahr variierte. Änderungen der Temperatur und der Menge und saisonalen Verteilung der Niederschläge als Folge natürlicher Schwankungen oder des globalen Wandels können daher den C4-Anteil und sein Raummuster stark beeinflussen." @default.
- W2100027303 created "2016-06-24" @default.
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- W2100027303 date "2012-02-01" @default.
- W2100027303 modified "2023-09-25" @default.
- W2100027303 title "C4 abundance in an Inner Mongolia grassland system is driven by temperature–moisture interaction, not grazing pressure" @default.
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- W2100027303 doi "https://doi.org/10.1016/j.baae.2011.11.004" @default.
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