Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands

NWIPB OpenIR

	Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands
	Chang, Xiaofeng ; Zhu, Xiaoxue ; Wang, Shiping ; Luo, Caiyun ; Zhang, Zhenhua ; Duan, Jichuang ; Bai, Ling ; Wang, Wenying
	2012-09-01
发表期刊	SOIL SCIENCE ; Gong, H; Chen, G; Li, F; Wang, X; Hu, Y; Bi, Y.Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands,SOIL SCIENCE,2012,177(9):554-560
摘要	The Tibetan Plateau, the low-latitude and high-altitude cold region, has a variety of soils rich in organic carbon (C). Climate change will have large impacts on soil carbon dioxide (CO2) efflux in the region. These impacts will subsequently affect global-scale climate and C cycle links. However, the magnitude of this feedback is still uncertain. Here we use a laboratory incubation experiment to investigate how soil temperature and moisture affected the rate and temperature sensitivity of heterotrophic respiration of three alpine ecosystems (alpine meadow [M], alpine shrubland [SB], alpine swamp [SP]) on the Tibetan Plateau. Soil samples were incubated under three temperature (0 degrees C, 15 degrees C, and 30 degrees C) and two moisture (50% and 100% water-holding capacity) conditions. The response of soil respiration to temperature and moisture varied with ecosystems. Soil respiration in SP was the most temperature sensitive, and higher moisture increased its temperature sensitivity (Q(10)). The respiration and Q(10) depended on total nitrogen in soils. Moreover, high moisture increased the dependence of Q(10) on total nitrogen. Our results suggest that rising temperature in Tibetan Plateau may cause a positive feedback to the soil C cycle, particularly coupled with increasing precipitation and N addition.; The Tibetan Plateau, the low-latitude and high-altitude cold region, has a variety of soils rich in organic carbon (C). Climate change will have large impacts on soil carbon dioxide (CO2) efflux in the region. These impacts will subsequently affect global-scale climate and C cycle links. However, the magnitude of this feedback is still uncertain. Here we use a laboratory incubation experiment to investigate how soil temperature and moisture affected the rate and temperature sensitivity of heterotrophic respiration of three alpine ecosystems (alpine meadow [M], alpine shrubland [SB], alpine swamp [SP]) on the Tibetan Plateau. Soil samples were incubated under three temperature (0 degrees C, 15 degrees C, and 30 degrees C) and two moisture (50% and 100% water-holding capacity) conditions. The response of soil respiration to temperature and moisture varied with ecosystems. Soil respiration in SP was the most temperature sensitive, and higher moisture increased its temperature sensitivity (Q(10)). The respiration and Q(10) depended on total nitrogen in soils. Moreover, high moisture increased the dependence of Q(10) on total nitrogen. Our results suggest that rising temperature in Tibetan Plateau may cause a positive feedback to the soil C cycle, particularly coupled with increasing precipitation and N addition.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/36854
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Chang, Xiaofeng,Zhu, Xiaoxue,Wang, Shiping,et al. Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands[J]. SOIL SCIENCE, Gong, H; Chen, G; Li, F; Wang, X; Hu, Y; Bi, Y.Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands,SOIL SCIENCE,2012,177(9):554-560,2012.
APA	Chang, Xiaofeng.,Zhu, Xiaoxue.,Wang, Shiping.,Luo, Caiyun.,Zhang, Zhenhua.,...&Wang, Wenying.(2012).Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands.SOIL SCIENCE.
MLA	Chang, Xiaofeng,et al."Temperature and Moisture Effects on Soil Respiration in Alpine Grasslands".SOIL SCIENCE (2012).