Dissertation Research: Invasion of Non-Indigenous Grasses into a Hawaiian Dry Woodland and the Ecosystem Consequences of Changes in Community Structure

论文研究：非本土草类入侵夏威夷干燥林地以及群落结构变化的生态系统后果

基本信息

批准号：
9700737
负责人：
Carla D'Antonio
金额：
$ 0.64万
依托单位：
University of California-Berkeley
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-05-01 至 1999-04-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9700737&HistoricalAwards=false
关键词：
Dissertation Research Invasion Non Indigenous

项目摘要

9700737 D'Antonio This proposal examines the links between biological invasions, changes in community composition, and alteration of ecosystem processes that contribute to changes in the global nitrogen (N) cycle. The objectives of the proposed research are to define mechanisms by which non-indigenous grasses in Hawaiian seasonal submontane woodlands have altered ecosystem N cycling and how these changes affect N availability to plant growth and ecosystem N accumulation. The hypothesis that insertion of grasses increases rates of N cycling and decreases rates of loss will be tested by comparing N dynamics among unburned woodland with grasses removed, unburned woodland with grasses, and burned sites that are grass dominated. Measurements of mineral nitrification, soil trace gas emissions, plant production, and ecosystem N partitioning using an 15N tracer will be made. This research provides a unique link between community and ecosystem processes by addressing the role that a new growth form plays in ecosystem N dynamics. This research will differentiate mechanisms through which grasses effect N dynamics, and it will simultaneously compare the physical, chemical, and competitive effects of a growth form on nutrient dynamics. This research also addresses feedbacks between growth form of invading species and local rates of resource supply that may influence competitive interactions and ultimately, the success of the invaders.

9700737 d'Antonio该提案研究了生物学入侵，社区组成的变化以及生态系统过程的变化之间的联系，这些过程有助于全球氮（N）周期的变化。拟议的研究的目标是定义机制，夏威夷季节性下层林地的非土著草改变了生态系统N循环以及这些变化如何影响N对植物生长和生态系统N积累的可用性。插入草的插入量会增加n循环速率和降低损失率的假设，将通过比较未燃烧的林地中的n个动态与去除，未燃烧的林地与草和烧焦的地点的n动态。将对使用15N示踪剂进行矿物硝化，土壤痕量气体排放，植物生产和生态系统的测量。这项研究通过解决新的增长形式在生态系统N动态中扮演的角色，从而提供了社区和生态系统过程之间的独特联系。这项研究将区分草通过n动力学的机制，并同时比较生长形式对营养动力学的物理，化学和竞争影响。这项研究还解决了入侵物种的增长形式与可能影响竞争互动的当地资源供应速率之间的反馈，最终会影响入侵者的成功。