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中亚热带毛竹和杉木的稳定碳同位素组成及其对水分利用效率的指示
Composition of Stable Carbon Isotope of Phyllostachys edulis and Cunninghamia lanceolata and Their Indications for Water Use Efficiency in the Middle Subtropics
【摘要】 测定和分析中亚热带毛竹和杉木植物叶片的δ13C值,结果表明:该区毛竹和杉木叶片的稳定碳同位素组成的变化范围分别为-29.42‰~-26.98‰平均值为(-27.96±0.16)‰和-27.88~-23.78‰平均值为(-26.41±0.18)‰。与我国其它地区植物的δ13C值平均值相比,毛竹除了比我国热带雨林区和亚热带喀斯特地区偏高外,比其它地区略偏低,而杉木除了比我国暖温带落叶阔叶林植物偏低外,比其它地区略偏高,且两种植物的δ13C值变化范围也较多数地区的小。与亚热带优势树种的δ13C比较,毛竹比马尾松、木荷小,比米槠大,而杉木与马尾松的较接近,比木荷和米槠大,这除了与植物本身的生物学特性有关外,可能还与植物生长的环境有关。此外,杉木的δ13C值大于毛竹,且差异明显,说明杉木的水分利用效率大于毛竹;两种植物的δ13C值的季节变化规律差异显著,均表现为生长初期大于生长末期,说明生长初期的水分利用效率大于生长末期;两种植物不同生长发育阶段的δ13C值差异不明显,说明其水分利用效率不存在差异,但随着年龄的增加,δ13C值表现有增加的趋势。
【Abstract】 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.
【Key words】 Phyllostachys edulis; Cunninghamia lanceolata; stable carbon isotope; water use efficiency;
- 【文献出处】 江西农业大学学报 ,Acta Agriculturae Universitatis Jiangxiensis , 编辑部邮箱 ,2011年01期
- 【分类号】S791.27;S795.7
- 【被引频次】10
- 【下载频次】347