气候变化领域集成服务门户(CCPortal): Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species

CCPortal

DOI	10.1093/jpe/rtt010
	Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species
	Shen, Haihua; Wang, Shiping; Tang, Yanhong
通讯作者	Shen, HH (通讯作者)
发表日期	2013
ISSN	1752-9921
EISSN	1752-993X
起始页码	418
结束页码	427
卷号	6 期号:5
英文摘要	Vast grasslands on the Tibetan 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. Experimental warming was carried by using an infrared heating system to increase the air temperature by 1.2 and 1.7C during the day and night, respectively. The warming and ambient temperature treatments were crossed over to the two grazing treatments, grazing and un-grazed treatments, respectively. To assess the effects of grazing and warming, we examined photosynthesis, dark respiration, maximum rates of the photosynthetic electron transport (J(max)), RuBP carboxylation (V-cmax) and temperature sensitivity of respiration Q(10) in Gentiana straminea, an alpine species widely distributed on the Tibetan grassland. Leaf morphological and chemical properties were also examined to understand the physiological responses. 1) Light-saturated photosynthetic rate (A(max)) of G. straminea showed similar temperature optimum at around 16C in plants from all experimental conditions. Experimental warming increased A(max) at all measuring temperatures from 10 to 25C, but the positive effect of the warming occurred only in plants grown under the un-grazed conditions. Under the same measuring temperature, A(max) was significantly higher in plants from the grazed than the un-grazed condition. 2) There was significant crossing effect of warming and grazing on the temperature sensitivity (Q(10)) of leaf dark respiration. Under the un-grazed condition, plants from the warming treatment showed lower respiration rate but similar Q(10) in comparison with plants from the ambient temperature treatment. However, under the grazed condition Q(10) was significantly lower in plants from the warming than the ambient treatment. 3) The results indicate that livestock grazing can alter the warming effects on leaf photosynthesis and temperature sensitivity of leaf dark respiration through changing physical environment of the grassland plants. The study suggests for the first time that grazing effects should be taken into account in predicting global warming effects on photosynthesis and respiration of plants in those grasslands with livestock grazing.
关键词	THERMAL-ACCLIMATION TEMPERATURE-DEPENDENCE SOUTHERN-POPULATIONS PLANT RESPIRATION CO2 ASSIMILATION GROWTH LEAVES TREE RESPONSES SOIL
英文关键词	alpine plant; grazing; photosynthesis; respiration; temperature acclimation
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS记录号	WOS:000324828500010
来源期刊	JOURNAL OF PLANT ECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258129
推荐引用方式 GB/T 7714	Shen, Haihua,Wang, Shiping,Tang, Yanhong. Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species[J]. 中国科学院青藏高原研究所,2013,6(5).
APA	Shen, Haihua,Wang, Shiping,&Tang, Yanhong.(2013).Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species.JOURNAL OF PLANT ECOLOGY,6(5).
MLA	Shen, Haihua,et al."Grazing alters warming effects on leaf photosynthesis and respiration in Gentiana straminea, an alpine forb species".JOURNAL OF PLANT ECOLOGY 6.5(2013).