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	Relationships between foliar carbon isotope composition and elements of C-3 species in grasslands of Inner Mongolia, China
	Zhou Y. C.; Cheng, X. L.; Fan, J. W.; Harris, W.; Shao, MA
	2016
关键词	Foliar carbon isotope composition Foliar elements Steppe grassland Plant functional groups Mean annual precipitation Inner Mongolia, China water-use efficiency ash content leaf carbon mediterranean conditions potassium concentration mineral-content tengger desert durum-wheat discrimination nitrogen
英文摘要	Foliar elements and their ratios can be related to foliar carbon isotope composition (delta C-13) through their involvement in plant transpiration, photosynthesis, and osmotic adjustment. In order to investigate these relationships in grasslands of Inner Mongolia, China, delta C-13 and element contents of dominant C-3 species at 47 grassland sites were determined. For C-3 species, delta C-13 showed no correlation with carbon (C), positive correlations with nitrogen (N), nitrogen:phosphorus ratio (N/P) and carbon:phosphorus ratio (C/P), and negative correlations with phosphorus (P), potassium (K), and carbon:nitrogen ratio (C/N), while correlation with P was subsidiary to positive correlation between P and K. These correlations indicate that plants in Inner Mongolia that survive in dry conditions may profit from their higher water use efficiency via stomatal regulation and N-related photosynthetic capacity rather than K-related osmotic adjustment and P-related photosynthetic capacity. Further, plants adapt to severe environments by having higher water and phosphorus use efficiency at the expense of nitrogen use efficiency. However, these correlations differed among plant functional groups (PFGs), e.g., delta C-13 was negatively correlated with N in shrubs in contrast to other life forms. A possible explanation is that shrubs adapt to low N availability by having lower photosynthetic nitrogen use efficiency (PNUE), so that N is not positively related to photosynthetic rate in shrubs. Obviously, data on stomatal conductance, PNUE, and cell osmotic pressure are needed to fully understand these correlations and the strategies of plants adapted to arid environments.
出处	Plant Ecology
卷	217
期	7
页	883-897
收录类别	SCI
语种	英语
ISSN号	1385-0237
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43959]
专题	生态系统网络观测与模拟院重点实验室_生态网络实验室
推荐引用方式 GB/T 7714	Zhou Y. C.,Cheng, X. L.,Fan, J. W.,et al. Relationships between foliar carbon isotope composition and elements of C-3 species in grasslands of Inner Mongolia, China. 2016.

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