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Native Earthworms Reduce Impacts of Exotic Earthworm Invasions on Soil Processes in Wildland Ecosystems

本土蚯蚓减少了外来蚯蚓入侵对荒地生态系统土壤过程的影响

基本信息

批准号：
0236276
负责人：
Paul Hendrix
金额：
$ 50万
依托单位：
University of Georgia Research Foundation Inc
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2003
资助国家：
美国
起止时间：
2003-03-01 至 2008-02-29
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0236276&HistoricalAwards=false
关键词：
Native Earthworms Reduce Impacts Exotic

项目摘要

Research over the past century has shown that where earthworms are abundant, they significantly influence soil processes critical to the functioning of terrestrial ecosystems. Recent interest has focused on impacts of invasive, exotic earthworms on soil processes, particularly in temperate regions. Dramatic effects of introduced earthworms on soil organic matter dynamics have been reported in a number of cases. The focus of nearly all of this work has been on a few species of exotic earthworms which have achieved wide distributions and now dominate the soil fauna in many ecosystems. Such effects have rarely been reported from invasions of ecosystems inhabited by native earthworm assemblages, particularly where soils are undisturbed. Objectives of this proposed work are to address the following questions:1) Do native earthworm species maintain exclusivity or dominance over exotic earthworm species in undisturbed, native ecosystems? 2) Are the impacts of exotic earthworm species on soil processes reduced in the presence of native earthworm species in their native ecosystems? Broader impacts: This work will promote training of a post-doctoral associate, a graduate student and several undergraduate students. Collaborations with regional and national museums will be developed to foster any new biological collections and to promote biodiversity information.

过去世纪的研究表明，在蚯蚓丰富的地方，它们对陆地生态系统功能至关重要的土壤过程产生重大影响。最近的兴趣集中在入侵，外来蚯蚓对土壤过程的影响，特别是在温带地区。在许多情况下，已经报道了引进蚯蚓对土壤有机质动态的巨大影响。几乎所有这些工作的重点都集中在少数几种外来蚯蚓上，这些蚯蚓已经实现了广泛的分布，现在在许多生态系统中占主导地位。这种影响很少有报道从入侵的生态系统居住的原生植物组合，特别是在土壤不受干扰。这项工作的目标是解决以下问题：1）本地的物种保持排他性或优势，在不受干扰的，本地生态系统的外来物种？2)外来物种对土壤过程的影响是否在本地物种存在的情况下减少？更广泛的影响：这项工作将促进对一名博士后助理、一名研究生和几名本科生的培训。将发展与区域和国家博物馆的合作，以促进任何新的生物收藏和宣传生物多样性信息。