Kazan Federal University Digital Repository

Effects of biotic and abiotic factors on soil organic matter mineralization: Experiments and structural modeling analysis

Show simple item record

dc.date.accessioned 2019-01-22T20:43:18Z
dc.date.available 2019-01-22T20:43:18Z
dc.date.issued 2018
dc.identifier.issn 1164-5563
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/148443
dc.description.abstract © 2017 Elsevier Masson SAS Soil organic matter (SOM) mineralization is affected by various abiotic and biotic factors, as well as the input of exogenous organic substances. Our previous studies have shown that SOM mineralization in flooded rice paddies is lower than that in adjacent upland soils in subtropical agro-ecosystems. However, the main factors contributing to the differences in SOM mineralization remain unclear. To compare the effects of biotic and abiotic factors on SOM mineralization between upland and paddy soils, we incubated upland and paddy (flooded) soils with three low molecular weight organic substances (LMWOS, i.e., glucose, acetic acid, or oxalic acid) for 30 days under field conditions. Generally, the average CO2 efflux from upland soil was higher than that in paddy soil with the same LMWOS addition. The total content of phospholipid fatty acids (PLFAs) in paddy soil was 2–5 times higher than that of upland soil, irrespective of the LMWOS added. Redundancy analyses indicated that microbial community composition was influenced mainly by the low redox potential (Eh) and dissolved organic carbon in paddy soil. Structural equation modeling revealed that, among abiotic factors, temperature exerted indirect effects on SOM mineralization by influencing biotic factors in both soils; Eh has a positive and direct effect on SOM mineralization in paddy soil. In terms of biotic factors, SOM mineralization in upland soil was mainly regulated by the quantity of bacteria. In paddy soil, SOM mineralization was largely influenced by the ratio of fungal to bacterial PLFAs and peroxidase activity.
dc.relation.ispartofseries European Journal of Soil Biology
dc.subject Environmental factors
dc.subject Microbial phospholipid fatty acid
dc.subject Paddy soil
dc.subject Soil organic matter mineralization
dc.subject Structural equation modeling
dc.subject Upland soil
dc.title Effects of biotic and abiotic factors on soil organic matter mineralization: Experiments and structural modeling analysis
dc.type Article
dc.relation.ispartofseries-volume 84
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 27
dc.source.id SCOPUS11645563-2018-84-SID85037608008


Files in this item

This item appears in the following Collection(s)

  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

Show simple item record

Search DSpace


Advanced Search

Browse

My Account

Statistics