Stoichiometric shifts in surface soils over broad geographical scales: evidence from China's grasslands

doi:10.1111/geb.12175

	Stoichiometric shifts in surface soils over broad geographical scales: evidence from China's grasslands
	Yang, Yuanhe1,2 ; Fang, Jingyun1,2 ; Ji, Chengjun 1,2; Datta, Arindam 3; Li, Pin 1,2; Ma, Wenhong 4; Mohammat, Anwar 5; Shen, Haihua ; Hu, Huifeng ; Knapp, Benjamin O.; Smith, Pete 3
	2014
发表期刊	GLOBAL ECOLOGY AND BIOGEOGRAPHY
ISSN	1466-822X
卷号	23 期号:8 页码:947-955
摘要	Aim The identification of stoichiometric flexibility is crucial for understanding carbon-nitrogen-phosphorus (C-N-P) interactions and ecosystem dynamics under a changing environment. However, current evidence of stoichiometric flexibility mainly comes from manipulation experiments, with little evidence from large-scale observations. Location Alpine and temperate grasslands across northern China. Methods Using soil profiles derived from a historical national soil inventory and a contemporary regional soil survey across China's grasslands, we examined temporal changes in topsoil C:N:P ratios over recent decades. Results Topsoil C: N ratios of five major grassland types exhibited some flexibility but did not show significant changes over the sampling interval. Non-significant changes in topsoil C: N ratios were observed both in alpine grasslands on the Tibetan Plateau and in temperate grasslands on the Inner Mongolian Plateau. Consistent with the relatively stable C: N ratios, the slope of the soil C-N stoichiometric relationship did not differ significantly between the two sampling periods. Soil N: P ratios in the surface layer increased significantly over the sampling interval, however, with an overall increase of 0.60 (95% confidence interval 0.58-0.62). A larger increase in soil N: P ratio was found in temperate grasslands on the Inner Mongolian Plateau than in alpine grasslands on the Tibetan Plateau. Moreover, the slope of the soil N-P stoichiometric relationship in these grassland ecosystems became steeper over the sampling interval. Main conclusions These results demonstrate the stability of topsoil C: N stoichiometry but variability in N: P stoichiometry over broad geographical scales, highlighting that soil C and N are tightly coupled, but N and P tend to be decoupled under a changing environment.
关键词	Carbon-nitrogen-phosphorus interactions carbon:nitrogen:phosphorus ratio ecological stoichiometry grassland ecosystems soil inventory stoichiometric flexibility
学科领域	Ecology ; Geography, Physical
DOI	10.1111/geb.12175
收录类别	SCI
语种	英语
WOS关键词	ELEVATED CO2 ; NITROGEN DEPOSITION ; INORGANIC CARBON ; PHOSPHORUS ; ECOSYSTEMS ; LIMITATION ; DECOMPOSITION ; PATTERNS ; TOPSOIL ; WATER
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography
WOS记录号	WOS:000339110400012
出版者	WILEY
文献子类	Article
出版地	HOBOKEN
EISSN	1466-8238
资助机构	National Basic Research Program of China on Global Change [2014CB954001, 2010CB950600] ; National Natural Science Foundation of China [31322011, 41371213, 31021001] ; Thousand Young Talents Program
作者邮箱	yhyang@ibcas.ac.cn
引用统计	被引频次：59[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27302
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, State Key Lab Vegetat & Environm Change, Inst Bot, Beijing 100093, Peoples R China 2.Peking Univ, Dept Ecol, Beijing 100871, Peoples R China 3.Peking Univ, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 4.Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen AB24 3UU, Scotland 5.Inner Mongolia Univ, Coll Life Sci, Hohhot 010021, Peoples R China 6.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China 7.Knapp, Benjamin O.] Univ Missouri, Dept Forestry, Columbia, MO 65211 USA
推荐引用方式 GB/T 7714	Yang, Yuanhe,Fang, Jingyun,Ji, Chengjun,et al. Stoichiometric shifts in surface soils over broad geographical scales: evidence from China's grasslands[J]. GLOBAL ECOLOGY AND BIOGEOGRAPHY,2014,23(8):947-955.
APA	Yang, Yuanhe.,Fang, Jingyun.,Ji, Chengjun.,Datta, Arindam.,Li, Pin.,...&Smith, Pete.(2014).Stoichiometric shifts in surface soils over broad geographical scales: evidence from China's grasslands.GLOBAL ECOLOGY AND BIOGEOGRAPHY,23(8),947-955.
MLA	Yang, Yuanhe,et al."Stoichiometric shifts in surface soils over broad geographical scales: evidence from China's grasslands".GLOBAL ECOLOGY AND BIOGEOGRAPHY 23.8(2014):947-955.

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