SGER: Amount, Rate and C-isotope value of Soil Organic Matter Production by Armadillidium vulgare

SGER：犰狳产生的土壤有机质的数量、速率和 C 同位素值

• 批准号: 0107520
• 负责人: Hope Jahren
• 金额: $ 6万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-03-01 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107520&HistoricalAwards=false
• 关键词: SGER; Amount; Rate; isotope; value

Feeding activities of soil macrofauna exert critical influence upon the chemical and physical transformation of soil organic matter. In mesic and xeric habitats where earthworms are absent (e.g., parts of the Southwestern U.S.), soil isopods can be the primary detritivores. It is therefore likely that soil isopods play a pivotal role in organic matter processing, carbon and nitrogen cycling, and soil development in these regions. This research represents preliminary work on the influence of terrestrial isopods on the organic horizons of the soil profile through feeding and excretion. The research will utilize natural abundance 13C/12C ratios to investigate the source and fate of organic matter utilized by soil isopods. In feeding experiments to Armadillidium vulgare, a model organism for terrestrial isopod research due to its ubiquity, the investigators will determine feeding amount and rate across a gradient of soil organic substrates: green leaves, litter layer, and soil humus. They will also assess changes in C:N, %C and *13C composition of organic matter during feces production. The research has widespread implications to ecosystem processes in mesic and xeric habitats, due to the global distribution of Armadillidium vulgare.

大型土壤动物的摄食活动对土壤有机质的化学和物理转化具有重要影响。在没有蚯蚓的中旱生境中（例如，美国西南部的部分地区），土壤等足类可以是主要的食草动物。因此，土壤等足类动物可能在这些地区的有机质处理、碳和氮循环以及土壤发育中发挥关键作用。本研究代表了陆生等足类动物通过摄食和排泄对土壤剖面有机层的影响的初步工作。该研究将利用天然丰度13 C/12 C比率来调查土壤等足类动物利用的有机物质的来源和归宿。在对Armadillidium vulgare的饲养实验中，Armadillidium vulgare是陆生等足类动物研究的模式生物，由于其普遍存在，研究人员将确定土壤有机基质梯度的饲养量和速率：绿色叶子，凋落物层和土壤腐殖质。 他们还将评估粪便产生过程中有机物的C：N、%C和 * 13 C组成的变化。由于Armadillidium vulgare的全球分布，该研究对中旱生境的生态系统过程具有广泛的影响。