Helliker Brent R, Ehleringer James R
Stable Isotope Ratio Facility for Environmental Research, 257 S. 1400 E., Department of Biology, University of Utah, Salt Lake City, Utah 84112, USA. Current address: Carnegie Institution of Washington, Department of Plant Biology, 260 Panama St, Stanford, CA 94305, USA.Corresponding author; email:
Stable Isotope Ratio Facility for Environmental Research, 257 S. 1400 E., Department of Biology, University of Utah, Salt Lake City, Utah 84112, USA.
Funct Plant Biol. 2002 Apr;29(4):435-442. doi: 10.1071/PP01122.
We show that differences in the oxygen isotope ratio of leaf water between C3 and C4 grasses (five species of each photosynthetic type) become less distinct as relative humidity increases, and that O leaf water differences translate directly to the oxygen isotope ratio of leaf cellulose. A conceptual model is presented that is based on grass blade growth characteristics and observed patterns of progressive enrichment in grasses. The Barbour and Farquhar (2000) model was capable of explaining the oxygen isotope ratio of bulk leaf cellulose of C3 and C4 grasses grown under a variety of growth conditions.
我们发现，随着相对湿度的增加，C3和C4禾本科植物（每种光合类型各五种）叶片水分中氧同位素比率的差异变得不那么明显，并且叶片水分差异直接转化为叶片纤维素的氧同位素比率。本文提出了一个基于草叶生长特征和禾本科植物中逐渐富集的观察模式的概念模型。Barbour和Farquhar（2000）的模型能够解释在各种生长条件下生长的C3和C4禾本科植物叶片纤维素整体的氧同位素比率。
