干旱区生态环境知识资源中心(Arid): Spatial heterogeneity in the relationship between precipitation and carbon isotopic discrimination in C-3 plants: Inferences from a global compilation

Arid

DOI	10.1016/j.gloplacha.2019.02.002
	Spatial heterogeneity in the relationship between precipitation and carbon isotopic discrimination in C-3 plants: Inferences from a global compilation
	Basu, Sayak 1; Ghosh, Sambit 1,2; Sanyal, Prasanta 1,2
通讯作者	Ghosh, Sambit
来源期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
EISSN	1872-6364
出版年	2019
卷号	176 页码:123-131
英文摘要	Understanding the causes of large variations in carbon isotopic composition of C-3 plants (delta C-13(C3)) is a key challenge for paleoenvironmental reconstruction. Several investigations have attempted to study the global patterns in the delta C-13(C3) values and their correlation with the precipitation variability. Sparse representation of dataset from low-latitude and equatorial regions in the existing global compilation hinders to understand the precipitation-delta C-13(C3) gradient at different latitudinal bands. In the present study, available global compilation has been extended with the newly measured dataset, and the new compilation (ca. 15 times larger than previous dataset) comprises results from 720 sites across the world. All the delta C-13(C3) values have been converted to carbon isotopic discrimination between air and leaf (Delta(air-leaf)). Mann-Whitney analysis indicates distinct region-specific distribution of the Delta(air-leaf) values. The average average Delta(air-leaf) value in mid-latitude region of the Northern Hemisphere is ca. 2 parts per thousand lower than equatorial sites. Multiple linear models have been used to investigate relative influence of climatic (precipitation and temperature) and geographical factors (altitude and latitude) on the Delta(air-leaf) values. This analysis shows that precipitation controls the Delta(air-leaf) values in every latitudinal-bin though the effect of precipitation is negligible beyond 1500 mm. Furthermore, the Delta(air-leaf)-precipitation gradient has a large spatial variability and the most prominent changes in the Delta(air-leaf) values have been observed at arid regions in mid-latitudes of the Southern Hemisphere (maximum 1.3 parts per thousand 100 mm(-1)). Region-specific distribution of delta C-13 values of plant and Delta(air-leaf)-precipitation gradient prompt to recalculate the relative abundance of C-3-C-4 plants in the Siwalik sections of the Himalayan foreland basin. Our results show that earlier investigations in the Siwaliks for the Middle-Late Miocene have underestimated the abundance of C-4 plants by ca. 20%. The recalculation shows that C-4 plants existed in these regions earlier (ca. 17 Ma) than the previously proposed timings.
类型	Article
语种	英语
国家	India
收录类别	SCI-E
WOS记录号	WOS:000465364600009
WOS关键词	WATER-USE EFFICIENCY ; INDIAN SIWALIK ; LATE MIOCENE ; C-13 DISCRIMINATION ; HIMALAYAN FORELAND ; MONSOONAL RAINFALL ; C3 PLANTS ; FRACTIONATION ; CO2 ; INDICATORS
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216068
作者单位	1.Indian Inst Sci Educ & Res Kolkata, Dept Earth Sci, Mohanpur 741296, India; 2.Indian Inst Sci Educ & Res Kolkata, Ctr Climate & Environm Studies, Mohanpur 741246, India
推荐引用方式 GB/T 7714	Basu, Sayak,Ghosh, Sambit,Sanyal, Prasanta. Spatial heterogeneity in the relationship between precipitation and carbon isotopic discrimination in C-3 plants: Inferences from a global compilation[J],2019,176:123-131.
APA	Basu, Sayak,Ghosh, Sambit,&Sanyal, Prasanta.(2019).Spatial heterogeneity in the relationship between precipitation and carbon isotopic discrimination in C-3 plants: Inferences from a global compilation.GLOBAL AND PLANETARY CHANGE,176,123-131.
MLA	Basu, Sayak,et al."Spatial heterogeneity in the relationship between precipitation and carbon isotopic discrimination in C-3 plants: Inferences from a global compilation".GLOBAL AND PLANETARY CHANGE 176(2019):123-131.