Composition of Stable Carbon Isotope of Phyllostachys edulis and Cunninghamia lanceolata and Their Indications for Water Use Efficiency in the Middle Subtropics
Measurement and analysis of the value of δ13C of the leaves of Phyllostachys edulis and Cunninghamia lanceolata in the middle subtropics indicate the composition of stable carbon isotope for P.edulis leaves in this region, which ranges from -29.42‰ to -26.98‰ with an average ( -27.96 ± 0.16)‰, and the composition of stable carbon isotope for C.lanceolata leaves range from - 27.88‰ to - 23.78‰ with an average ( -26.41 ±0.18)‰.Compared with the average value of δ13C of those plants in other regions of China, except being slightly higher than that of the plants in the tropical regions and sub - tropical karst regions, the average δ13C value of P.edulis is slightly lower than that of the plants in other regions.Except being slightly lower than that of broad -leaved deciduous forest of the temperate zone, the average δ13C value of C.lanceolata is slightly higher than that of the plants in other regions.The variation ranges of δ13C of P.edulis and C.lanceolata are smaller than that of the plants in most other regions.Compared with the dominant tree species in the subtropics, the δ13C value of P.edulis is smaller than that of Pinus massoniana and Schima superba and bigger than that of Castanopsis carlessi.The δ13C value of C.lanceolata is close to that of P.massoniana and bigger than that of Schima superba and Castanopsis carlessi, which is not only related to the biological characteristics of the plants themselves, but also maybe related to the living environment.Besides, there is distinct difference between the two species in δ13C value with C.lanceolata bigger than P.edulis and accordingly better WUE.Concerning the seasonal variations of δ13C values of the two plants, the values are much bigger, with distinct difference, in the initial growth phase than in the later growth phases, which indicates better WUE in the initial growth phase.There is not so much difference between the δ13C values, which indicates not so much difference in WUE, in the different development stages of the two species while the value increases with ages.
国家科技期刊平台
NSTL
万方数据
维普
