摘要
本文研究了麻疯树果实及其组成的资源配置问题,分析了果实大小和结籽率对果实组成的影响。攀枝花市麻疯树果实平均重量为1.7 g,其中种子平均重量1.17 g,壳重量0.53 g,分别占34%和67%。单个果实平均种子数为2.47个,结籽率为82%,单粒种子重量为0.47 g。这些果实及其组成的参数存在明显的样地间差异,可能与土壤厚度有关。从统计学上考虑,麻疯树果实及其组分存在正态或偏态分布,变异程度可用整齐度来表示。麻疯树果实大小对其组分参数具有调控作用。回归表明,果实大小和壳重量之间符合多项式模型:y=0.0013x4+0.054x3-0.2769x2+0.5933x+0.048(R2=0.6671);果实大小和种子重量之间也符合多项式模型:y=0.0786x2-0.3723x+0.7175(R2=0.6225)。结果表明,果实较小时较多资源投资在果壳上,而果实较大时较多资源投资在种子上,超过一定大小则对壳的投资较多。还表明,麻疯树果实组分的资源配置存在一个优化模式,约在2.5 g左右壳比例最低而种子比例最高。结籽率高的果实较大,而单粒种子重量较低,单个果实种子重量较大。不考虑其它因素,麻疯树果实大小和结籽率对果实组成的资源配置起到了调节作用。
In this paper, studies were made of the resource allocation of Jatropha curcas fruits and their composition and an analysis was made of the influence of the fruit size and seed setting rate on the fruit composition. The average fruit weight was 1.7 g, of which the average seed weight was 1.17 g, and the fruit shell weight was 0.53 g, which were respectively 34% and 67% of the total fruit weight. On an average,there were 2.47 seeds in a single fruit, the seed setting rate was 82% in all samples measured, and a single seed had a weight of 0.47 g. There was an obvious difference in fruits and their composition parameters between plots, which was probably related to the depth of soil. Statistically, there was a posi- tive or partial distribution in the fruit and its components, and the varied degrees of size were indexed by regularity. Within and among plots, the fruit size had an obvious function in charge of the fruit composition parameters. There were a muhinomial model accorded with regression between fruit size and shell weight, which was y = 0. 0013x^4 ＋ 0. 054x^3 - 0. 2769x^2 ＋ 0. 5933x ＋ 0. 048 （ R^2 = 0. 6671 ） , and y = 0. 0786x^2 - 0. 3723x ＋ 0. 7175 （ R^2 = 0. 6225 ） answered for the relation between fruit size and shell weight. This model demonstrated that more resource would be allocated to fruit shell when the fruit size was smaller, more resource would be allocated to seeds with a higher fruit size, but above the middle fruit size the reproductive branches still allocated more resources to fruit shell. These results also implied that there was an optimal pattern of resource allocation,which had the highest seed proportion and the lowest shell proportions when the fruit size was about 2. 5 g. The seed setting rate also affected the resource allocation of the fruit composition. The higher seed setting rate had the bigger fruit, the lower weight of a single seed and the bigger weight of a single fruit. Regardless of other factors, the fruit size and seed setting rate had an accommodating
出处
《四川林业科技》
2008年第6期1-10,共10页
Journal of Sichuan Forestry Science and Technology
基金
四川省麻疯树资源培育科技支撑项目
西南地区麻疯树资源良种选育及规模化
综合利用关键技术研究与示范项目
关键词
麻疯树
果实
结籽率
果实组成
大小依赖性
资源配置
Jatropha curcas, Fruit, Seed setting rate, Fruit composition, Size-dependent, Resource alloca- tion
