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	Variation in carbon isotope discrimination in Cleistogenes squarrosa (Trin.) Keng: patterns and drivers at tiller, local, catchment, and regional scales
	Yang H.
	2011
关键词	C(4) species (13)C discrimination grazing Inner Mongolian steppe leaf nitrogen content precipitation bundle-sheath leakiness xilin river-basin amaranthus-retroflexus l nitrogen use efficiency inner-mongolia steppe water-use efficiency chenopodium-album l c-4 plants gas-exchange rainfall gradient
英文摘要	Understanding the patterns and drivers of carbon isotope discrimination in C(4) species is critical for predicting the effects of global change on C(3)/C(4) ratio of plant community and consequently on ecosystem functioning and services. Cleistogenes squarrosa (Trin.) Keng is a dominant C(4) perennial bunchgrass of arid and semi-arid ecosystems across the Mongolian plateau of the Eurasian steppe. Its carbon isotope discrimination ((13)delta) during photosynthesis is relatively large among C(4) species and it is variable. Here the (13)delta of C. squarrosa and its potential drivers at a nested set of scales were examined. Within cohorts of tillers, (13)delta of leaves increased from 5.1 parts per thousand to 8.1 parts per thousand from old to young leaves. At the local scale, (13)delta of mature leaves varied from 5.8 parts per thousand to 8.4 parts per thousand, increasing with decreasing grazing intensity. At the catchment scale, (13)delta of mature leaves varied from 6.2 parts per thousand to 8.5 parts per thousand and increased with topsoil silt content. At the regional scale, (13)delta of mature leaves varied from 5.5 parts per thousand to 8.9 parts per thousand, increasing with growing-season precipitation. At all scales, (13)delta decreased with increasing leaf nitrogen content (N(leaf)). N(leaf) was positively correlated with grazing intensity and leaf position along tillers, but negatively correlated with precipitation. The presence of the correlations across a range of different environmental contexts strongly implicates N(leaf) as a major driver of (13)delta in C. squarrosa and, possibly, other C(4) species.
出处	Journal of Experimental Botany
卷	62
期	12
页	4143-4152
收录类别	SCI
语种	英语
ISSN号	0022-0957
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22606]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yang H.. Variation in carbon isotope discrimination in Cleistogenes squarrosa (Trin.) Keng: patterns and drivers at tiller, local, catchment, and regional scales. 2011.

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