在森林和草原的废弃物输入改变下,土壤动物密度和微生物群落的变化
Xinyu Wei1, Fuzhong Wu1, Petr Heděnec2,3
1Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education, School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China.
Fundamental research
|June 27, 2024
概括
增加垃圾增加了土壤微生物,而不是土壤动物,特别是在草原. 清除垃圾会伤害土壤动物,但不会伤害微生物. 根垃圾特别有利于土壤真菌.
科学领域:
- 土壤生态学 土壤生态学
- 陆地生态系统 地球生态系统
- 生物地质化学生物地质化学
背景情况:
- 根和叶子垃圾是土壤生物的关键碳和营养来源.
- 在整个生态系统中对土壤动物和微生物的垃圾影响的定量数据有限.
研究的目的:
- 评估添加和删除叶子和根对土壤动物密度和微生物生物质的影响.
- 为了比较全球森林和草原之间的这些影响.
主要方法:
- 汇编了来自全球68个实验场所的978个配对观测结果.
- 使用脂脂肪酸 (PLFA) 评估的微生物生物量.
- 分析了垃圾添加和清除对土壤动物和微生物群落的影响.
主要成果:
- 垃圾添加显著增加了微生物,真菌和细菌的总PLFA (13%,14%,10%),对动物密度的影响很小.
- 垃圾清除显著降低了土壤动物密度 (17%),但对微生物的影响很小.
- 根的垃圾对土壤的真菌种群产生了比叶子垃圾更多的积极影响.
- 在潮湿和干旱地区的影响相似,但对草原土壤微生物的影响比森林更大.
结论:
- 土壤微生物群落对碳输入比土壤动物更敏感,特别是在C:N比率低的土壤中.
- 由于全球绿化而增加的垃圾产量,可能会比森林微生物活动更多地刺激草原微生物活动.
- 这种刺激将使土壤微生物比土壤动物更受益.
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