Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species

Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species
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放牧改变了高山非草类植物秦艽叶片光合作用和呼吸作用的变暖效应

DOI:
10.1093/jpe/rtt010
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发表时间:
2013-10
影响因子:
2.7
通讯作者:
Tang YH
Tang YH
中科院分区:
生物学3区
文献类型:
--
作者:
Shen HH;Wang SP;Tang YH

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在西藏高原上,广阔的草原上几乎都是牲畜放牧。然而,在未来气候变暖的情况下,放牧在草地碳循环中的作用尚不清楚。我们在前期的研究中发现,实验变暖可以使高山植物的饱和光合速率的最适温度向更高的温度移动。在这项研究中,我们提出并验证了这一假设,即牲畜放牧会改变光合作用和呼吸的变暖效应,通过改变草地植物的物理环境。方法采用红外线加热系统进行实验性加温,白天和夜间分别使空气温度升高1.2和1.7° C。升温和常温处理分别与放牧和不放牧处理交叉。为了评价放牧和升温对西藏高原草地植物麻花秦艽光合作用、暗呼吸、最大光合电子传递速率(Jmax)、rubP羧化(VCmax)和呼吸温度敏感性Q10的影响,我们研究了放牧和升温对麻花秦艽光合作用、暗呼吸、最大光合电子传递速率(Jmax)、rubP羧化(VCmax)和呼吸温度敏感性Q10的影响。并对叶片形态和化学特性进行了研究,以了解其生理反应。
Aims Vast grasslands on the t ibetan Plateau are almost all under livestock grazing. It is unclear, however, what is the role that the grazing will play in carbon cycle of the grassland under future climate warming. We found in our previous study that experimental warming can shift the optimum temperature of saturated photosynthetic rate into higher temperature in alpine plants. In this study, we proposed and tested the hypothesis that livestock grazing would alter the warming effect on photosynthetic and respiration through changing physical environments of grassland plants. Methods Experimental warming was carried by using an infrared heating system to increase the air temperature by 1.2 and 1.7° c during the day and night, respectively. t he warming and ambient temperature treatments were crossed over to the two grazing treatments, grazing and un-grazed treatments, respectively. t o assess the effects of grazing and warming, we examined photosynthesis, dark respiration, maximum rates of the photosynthetic electron transport (J max), r u bP carboxylation (V cmax) and temperature sensitivity of respiration Q 10 in Gentiana straminea, an alpine species widely distributed on the t ibetan grassland. leaf morphological and chemical properties were also examined to understand the physiological responses.
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