000224690 001__ 224690
000224690 005__ 20180317094109.0
000224690 0247_ $$2doi$$a10.1016/j.soilbio.2016.08.024
000224690 022__ $$a0038-0717
000224690 02470 $$2ISI$$a000388775400017
000224690 037__ $$aARTICLE
000224690 245__ $$aSoil microbial community resistance to drought and links to C stabilization in an Australian grassland
000224690 260__ $$aOxford$$bElsevier$$c2016
000224690 269__ $$a2016
000224690 300__ $$a10
000224690 336__ $$aJournal Articles
000224690 520__ $$aDrought is predicted to increase in many areas of the world, which can greatly influence soil microbial community structure and C stabilization. Increasing soil carbon (C) stabilization is an important strategy to mitigate climate change effects, but the underlying processes promoting C stabilization are still unclear. Microbes are an important contributor of C stabilization through the adsorption of microbial derived compounds on organo-mineral complexes. Management practices, such as addition of organic amendments might increase soil C stock and mitigate drought impacts, especially in agro-ecosystems where large losses of C have been reported. Here, we conducted a drought experiment where we tested whether the addition of organic amendments mitigates drought effects on soil C stabilization and its links to microbial community changes. In a semi-natural grassland system of eastern Australia, we combined a management treatment (compost vs. inorganic fertilizer addition) and a drought treatment using rainout shelters (half vs. ambient precipitation). We measured soil moisture, soil nitrogen and phosphorus, particulate organic C (Porn-C) and organo-mineral C (Min-C). Microbial community composition and biomass were assessed with PLFA analyses. A structural equation modeling (SEM) approach was used to examine the controls of soil moisture, Porn-C and nutrients on soil microbial biomass and community structure and changes in Min-C. Overall, the drought treatment did not affect microbial community structure and Min-C, while fertilizer only marginally increased Min-C, highlighting the resistance to these treatments in this grassland soil. In the surface soil (0-5 cm) Min-C was strongly associated with fungi that may have been stimulated by root exudates, and by gram-negative bacteria in the deep soil (5-15 cm) that were more affected by Porn-C and soil moisture. We conclude that the grassland microbial community and its effect on Min-C at our field-site were non-responsive to our drought treatment, but sensitive to variability in soil moisture and microbial community structure. Our findings also show that surface compost application can moderately increase soil C stabilization under drought, representing a useful tool for improving soil C stability. (C) 2016 Elsevier Ltd. All rights reserved.
000224690 6531_ $$aReduced precipitation
000224690 6531_ $$aOrgano-mineral carbon
000224690 6531_ $$aCompost
000224690 6531_ $$aRain out shelter
000224690 6531_ $$aPath-analysis
000224690 6531_ $$aGrassland
000224690 700__ $$aCanarini, Alberto
000224690 700__ $$aCarrillo, Yolima
000224690 700__ $$0243086$$aMariotte, Pierre$$g187772
000224690 700__ $$aIngram, Lachlan
000224690 700__ $$aDijkstra, Feike A.
000224690 773__ $$j103$$q171-180$$tSOIL BIOLOGY & BIOCHEMISTRY
000224690 909CO $$ooai:infoscience.tind.io:224690$$pENAC$$particle
000224690 909C0 $$0252129$$pECOS$$xU11021
000224690 917Z8 $$x187772
000224690 937__ $$aEPFL-ARTICLE-224690
000224690 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000224690 980__ $$aARTICLE