摘要
广东鼎湖山季风常绿阔叶林的主要优势乔木树种荷木和黧蒴幼苗生长于自然光照和人工调节ＣＯ２浓度为５００±５０μ１．Ｌ－１或空气ＣＯ２（３５０μ１．Ｌ－１）的气罩中３个月。高ＣＯ２浓度下生长的黧蒴和荷本植株总干物质量分别增加２６．６％和１６．６％，根部增加量最大，地上部分所占的比例降低，根冠比上升，基径增大而株高降低。高ＣＯ２浓度下生长的叶片密度及比叶重增加，叶肉细胞间隙体积减少。单位干重的黧蒴叶片可溶性糖含量、全碳、磷、钾含量在高ＣＯ２浓度下稍为下降，果糖、葡萄糖、蔗糖、全氮、镁含量及Ｎ／Ｃ比明显降低，而全钙含量无明显变化。
The biomass and the some leaf characters in the seedlings of two dominant tree species in Dinghushan forests were studied under long-term elevated [CO2]conditions.Potted seedlings of Castanopsis fissa and Schima superba were grown in semiopen top chambers with ambient(350ul.1-1)and superambient(500 ul. 1-1 )[CO2] under natural light.With increasing [CO2], the total dry matter of whole plant increased by 16.6%～26.6%, and both the ratios of underground to total weight and the root/shoot ratio increased. Whereas, the increase in stem diameter of the basic part and the decrease of plant height were also observed under [CO2]enrichment.In addition, the increase of leaf density,leaf thickness and specific leaf weight were associated with the decline of internal space volume. When expressed on dry weight basis,the contents of total nitrogen,Mg,fructose,glucose and sucrose as well as theN/Cratio of leaf of C. fissa reduced obviously by elevated [CO2], but no obvious change in total carbon, soluble sugar,Ca,Pand K was observed.
出处
《植物生态学报》
CAS
CSCD
北大核心
1996年第6期510-516,共7页
Chinese Journal of Plant Ecology
基金
国家自然科学基金
关键词
森林树种
Li蒴
荷木
生物量
叶片特性
二氧化碳
Elevated [CO_2]
Castanopsis fissa
Schima superba
Biomass
Leaf character
