原生生物
土壤水分
生态系统
生态学
生物
环境科学
分类单元
营养物
农学
生物化学
基因
作者
Stefan Geisen,Cornelia Bandow,Jörg Römbke,Michael Bonkowski
出处
期刊:Pedobiologia
[Elsevier]
日期:2014-11-01
卷期号:57 (4-6): 205-213
被引量:118
标识
DOI:10.1016/j.pedobi.2014.10.001
摘要
Drought and heavy rainfall are contrasting conditions expected to result from increasingly extreme weather during climate change; and both scenarios will strongly affect the functioning of soil systems. However, little is known about the specific responses of soil microorganisms, whose functioning is intimately tied to the magnitude of the water-filled pore space in soil. Soil heterotrophic protists, being important aquatic soil organisms are considered as key-regulators of microbial nutrient turnover. We investigated the responses of distinct protist taxa to changes in soil water availability (SWA) using a modified enumeration technique that enabled quantification of protist taxa up to genus level. Our study revealed a non-linear shift of protist abundance with decreasing SWA and this became apparent at a maximum water-filled pore size of ≤40 μm. Generally, taxa containing large specimen were more severely affected by drought, but responses to either drought or rewetting of soils were not uniform among taxa. Changes in water availability may thus affect the functioning of key taxa and soil ecosystems long before aboveground “drought” effects become apparent.
科研通智能强力驱动
Strongly Powered by AbleSci AI