相关实验视频
Updated: Jun 25, 2026
08:16
Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
Published on: March 13, 2014
在种子植物中生物质分区模式的全球分配规则
Brian J Enquist1, Karl J Niklas
1Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 87519, USA. benquist@u.arizona.edu
Science (New York, N.Y.)
|February 23, 2002
概括
一个新的全度模型预测了种子植物生物量分配,揭示了不同物种和环境中叶子,茎和根生物量的一致缩放关系. 这些发现定义了引导植物进化的界限.
科学领域:
- 植物生物学 植物生物学
- 生态生态学 生态生态学
- 一个全度测量法.
背景情况:
- 了解生物质分配对于植物生态学和进化至关重要.
- 种内和种间的缩放关系决定了植物器官如何生长和分配资源.
研究的目的:
- 为预测种子植物生物质扩展开发一个一般的全度模型.
- 定义地面和地下生物质分区的边界条件.
主要方法:
- 衍生出了一个生物质缩放的通用全度模型.
- 分析了大量的站立器官生物质数据汇总.
- 在各种植物分类和生态息地采样.
主要成果:
- 该模型准确地预测了叶子,茎和根生物质的物种内部和物种间的缩放关系.
- 生物质分区关系在针叶树和苗中是一致的.
- 这些关系对当地的环境条件的变化具有强大影响.
结论:
- 确定了对遗传学和环境因素不敏感的规范生物量关系.
- 定义了指导种子植物生物质分配战略多样化的极限.
相关概念视频
00:54Distribution and Dispersion
Ecology is the study of how organisms interact with their environment and with one another. An important aspect of ecology is understanding where species are found and how individuals are distributed within those areas. The geographic range of a species refers to the total area where its members are located, while dispersion describes the pattern of spacing of individuals within that range.Geographic Range and Dispersion PatternsWithin a species’ geographic range, individuals may be distributed...
01:49Law of Segregation
When crossing pea plants, Mendel noticed that one of the parental traits would sometimes disappear in the first generation of offspring, called the F1 generation, and could reappear in the next generation (F2). He concluded that one of the traits must be dominant over the other, thereby causing masking of one trait in the F1 generation. When he crossed the F1 plants, he found that 75% of the offspring in the F2 generation had the dominant phenotype, while 25% had the recessive phenotype.
02:03Law of Independent Assortment
While Mendel’s Law of Segregation states that the two alleles for one gene are separated into different gametes, a different question of how different genes are inherited remains. For example, is the gene for tall plants inherited with the gene for green peas? Mendel asked this question by experimenting with a dihybrid cross; a cross in which both parents are homozygous for two distinct traits resulting in an F1 generation that are heterozygous for both traits.
02:22Introduction to Plant Diversity
From Water to Land
03:40Introduction to Seed Plants
Most plants are seed plants—characterized by seeds, pollen, and reduced gametophytes. Seed plants include gymnosperms and angiosperms.
02:33Seed Structure and Early Development of the Sporophyte
Seed structures are composed of a protective seed coat surrounding a plant embryo, and a food store for the developing embryo. The embryo contains the precursor tissues for leaves, stem, and roots. The endosperm and cotyledons—seed leaves—act as the food reserves for the growing embryo.