Wilson Gail W T, Rice Charles W, Rillig Matthias C, Springer Adam, Hartnett David C
Department of Natural Resource Ecology and Management, Oklahoma State University, Stillwater, OK 74078, USA.
Ecol Lett. 2009 May;12(5):452-61. doi: 10.1111/j.1461-0248.2009.01303.x. Epub 2009 Mar 23.
We examined the role of arbuscular mycorrhizal fungi (AMF) in ecosystems using soil aggregate stability and C and N storage as representative ecosystem processes. We utilized a wide gradient in AMF abundance, obtained through long-term (17 and 6 years) large-scale field manipulations. Burning and N-fertilization increased soil AMF hyphae, glomalin-related soil protein (GRSP) pools and water-stable macroaggregates while fungicide applications reduced AMF hyphae, GRSP and water-stable macroaggregates. We found that AMF abundance was a surprisingly dominant factor explaining the vast majority of variability in soil aggregation. This experimental field study, involving long-term diverse management practices of native multispecies prairie communities, invariably showed a close positive correlation between AMF hyphal abundance and soil aggregation, and C and N sequestration. This highly significant linear correlation suggests there are serious consequences to the loss of AMF from ecosystems.
我们以土壤团聚体稳定性以及碳和氮的储存作为具有代表性的生态系统过程，研究了丛枝菌根真菌（AMF）在生态系统中的作用。我们利用通过长期（17年和6年）大规模田间操作获得的AMF丰度的广泛梯度。焚烧和施氮肥增加了土壤AMF菌丝、球囊霉素相关土壤蛋白（GRSP）库以及水稳性大团聚体，而施用杀真菌剂则减少了AMF菌丝、GRSP和水稳性大团聚体。我们发现，AMF丰度是解释土壤团聚体中绝大多数变异性的一个出奇重要的因素。这项涉及本地多物种草原群落长期多样管理实践的田间试验研究始终表明，AMF菌丝丰度与土壤团聚以及碳和氮的固存之间存在密切的正相关关系。这种高度显著的线性相关性表明，生态系统中AMF的丧失会带来严重后果。
