Spatial variability of isoproturon mineralizing activity within an agricultural field: geostatistical analysis of simple physicochemical and microbiological soil parameters.
We assessed the spatial variability of isoproturon mineralization in relation to that of physicochemical and biological parameters in fifty soil samples regularly collected along a sampling grid delimited across a 0.36 ha field plot (40 x 90 m). Only faint relationships were observed between isoproturon mineralization and the soil pH, microbial C biomass, and organic nitrogen. Considerable spatial variability was observed for six of the nine parameters tested (isoproturon mineralization rates, organic nitrogen, genetic structure of the microbial communities, soil pH, microbial biomass and equivalent humidity). The map of isoproturon mineralization rates distribution was similar to that of soil pH, microbial biomass, and organic nitrogen but different from those of structure of the microbial communities and equivalent humidity. Geostatistics revealed that the spatial heterogeneity in the rate of degradation of isoproturon corresponded to that of soil pH and microbial biomass.
El Sebai
T
T
UMR Microbiologie et Géochimie des Sols, INRA/CMSE, 17 Rue Sully, BP 86510, 21065 Dijon Cedex, France.
Lagacherie
B
B
Soulas
G
G
Martin-Laurent
F
F
D000383:Agriculture; D001419:Bacteria / Q000235:genetics; D018533:Biomass; D002244:Carbon / Q000032:analysis; D004269:DNA, Bacterial / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000235:genetics; D006540:Herbicides / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008903:Minerals / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D010671:Phenylurea Compounds / Q000737:chemistry*; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis*; D013223:Statistics as Topic / Q000379:methods
D004269:DNA, Bacterial; D021903:DNA, Ribosomal Spacer; D006540:Herbicides; D008903:Minerals; D010671:Phenylurea Compounds; D012987:Soil; D012989:Soil Pollutants; C028904:isoproturon; D002244:Carbon; D009584:Nitrogen