两种长春花生物量配置的比较

以不同生境(野生、露地栽培)条件下红长春花和白长春花为研究对象,对其生物总量、根冠比、各部位的生物量配置等方面进行了比较分析.结果表明:与白花长春花相比,红花长春花的根、茎、叶生物量分配比例较为合理,生殖配置高于白花,表现出较强的种间优势.2种长春花对茎和根的生物量的分配与植株的生长高度呈负相关.长春花叶的生物量分配与植株生长高度也出现了不协调.2种生境条件中,栽培条件下的长春花植株个体较大,生物量分配比较合理,生长比较稳定,说明在露地栽培条件下,长春花的营养生长和生殖生长间有较为合理的权衡关系,利于长春花的生长.

Comparison of Biomasses Assignment between Catharanthus roseus and Catharanthus roseus cv. Albus

The tootal biomass,root/shoot ratio and the biomass assignment of different part of Catharanthus roseus and Catharanthus roseus cv.Albus in wild and field culture habitat were studied in this article.The results show the biomass assignment of root,stem,leaf of Catharanthus roseus are more rational than that of Catharanthus roseus cv.Albus,the reproduction allocation of Catharanthus roseus is higher,so these show the interspectific dominant position of Catharanthus roseus.The biomass assignment of the stem and the root of Catharanthus roseus and Catharanthus roseus cv.Albus are opposite to the growth height.The biomass assignment of the leaf of Catharanthus roseus and Catharanthus roseus cv.Albus are also inconsistent to the growth height.Compared to in the wild habitat,the individual of Catharanthus roseus plant in the cultivation habitat is bigger,biomass assignment is more homogeneous,the growth is more stable.These result show the trade-off between vegetative growth and reproductive growth of Catharanthus roseus is more rational and the field cultivation is more suitable to Catharanthus roseus's growth.