Liana Root Systems, Root Foraging Efficiency, and Competitive Interactions with Trees

藤本植物根系、根部觅食效率以及与树木的竞争性相互作用

• 批准号: 9020003
• 负责人: Francis Putz
• 金额: $ 2万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-02-01 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020003&HistoricalAwards=false
• 关键词: Liana; Root; Systems; Foraging; Efficiency

Root systems of trees and lianas native to north-central Florida will be compared on the basis of morphology, maximum depth, and efficiency of colonization of resource-rich volumes of soil. Allometrical studies of lianas and trees will elucidate differences in the following ratios: roots:shoot biomass; leaf area:root surface area; leaf area:stem cross sectional area; and, root:root biomass. Additionally the P.I. will determine the degree to which dense tangles of lianas suppress tree seedling growth through competition belowground and aboveground. Liana roots, like their stems, do not serve a mechanical support function and thus belowground biomass can be allocated to maximize the volume of soil explored for water and nutrients. Liana root systems are expected to be extremely opportunistic in distribution and thus benefit more frequently than tree roots from spatial and temporal variation in water and nutrient availability. Differences between trees and lianas in root foraging efficiency will be experimentally determined.

原产于佛罗里达州中北部的树木和藤本植物的根系将在形态、最大深度和资源丰富的土壤定植效率的基础上进行比较。藤本植物和乔木的异速生长研究将阐明以下比率的差异：根：茎生物量；叶面积：根表面积；叶面积：茎截面积；根：根生物量。此外，P.I.将决定藤本植物密集缠结通过地下和地上的竞争抑制树木幼苗生长的程度。藤本植物的根和茎一样，不具有机械支撑功能，因此可以分配地下生物量，以最大限度地挖掘土壤的水分和养分。藤本植物根系在分布上极具机会性，因此比树木根系更频繁地受益于水分和养分有效性的时空变化。树木和藤本植物在根系觅食效率上的差异将通过实验来确定。