1Yi XF, Yang YQ, Zhang XA et al. No C4 plants found at the Haibei Alpine Meadow Ecosystem Research Station in Qinghai, China: Evidence from stable carbon isotope studies.Acta Bot Sin, 2003, 45(11): 1291~1296.
3Craig H. Isotope standards for carbon and oxygen and correlation factors for mass spectrometric analysis of carbon dioxide. Geochim Cosmochim Acta, 1957, 12:133~149.
4Neir AO, Gulbransen EA. Variations in the relative abundance of the carbon isotopes. J Am Chem Soc, 1939, 61:697~698.
5Bender MM. Variation in the ^13C/^12C ratios of plants in relation to the pathway of photosynthetic carbon dioxide fixation. Phytochemistry, 1971, 10:1239~1244.
6Smith BN, Epstein S. Two categories of ^13C/^12C ratios for higher plants. Plant Physiol, 1971, 47:380~384.
7Bender MM, Rouhani I, Vines HM et al. ^13C/^12C ratio changes in CAM. Plant Physiol, 1972, 52:427~430.
8Waller SS, Lewis JK. Occurrence of C3 and C4 photosynthesis in North American grasses. J Rang Manag, 1979, 32:12~28.
9Ziegler H, Batanouny KH, Sankhla N. The photosynthetic pathway types of some desert plants from India, Saudia Arabia, Egypt, and Iraq. Oecologia, 1981, 48:93~99.
10Ehleringer JR, Lin ZF, Field CB. Leaf carbon isotope ratios of plants from a subtropical monsoon forest. Oecologia,1987, 72:109~114.