Počet záznamů: 1  

Soil biochemical activity and phosphorus transformations and losses from acidified forest soils

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    0105450 - UPB-H 20043055 RIV GB eng J - Článek v odborném periodiku
    Šantrůčková, Hana - Vrba, Jaroslav - Picek, T. - Kopáček, Jiří
    Soil biochemical activity and phosphorus transformations and losses from acidified forest soils.
    [Biochemická aktivita půdy a transformace fosforu a jeho vyplavování z acidifikovaných půd.]
    Soil Biology and Biochemistry. Roč. 36, - (2004), s. 1569-1576. ISSN 0038-0717
    Výzkumný záměr: CEZ:AV0Z6066911
    Klíčová slova: phosphatase * microbial P * C mineralisation
    Kód oboru RIV: EH - Ekologie - společenstva
    Impakt faktor: 2.234, rok: 2004

    Three Bohemian Forest catchments, Plešné, Černé and Čertovo, were studied. These catchments have similar climatic conditions, relief and vegetation, but differ in their bedrock composition. The granitic bedrock in the Plešné catchment was more susceptible to phosphorus (P) leaching under acid conditions than was the mica schist bedrock in the other catchments. The goal of this study was to determine if higher P leaching from the Plešné catchment was associated with differences in microbial P transformations and enzymatic P hydrolysis. Phosphorus and nitrogen contents in soil microbial biomass (PMB, NMB; chloroform fumigation), C mineralisation rate (Cmin; CO2 production by GC) and phosphatase activity (MUF-phosphate), were measured in three successive years. Phosphatase activity, PMB, and Cmin were used to characterise the enzymatic hydrolysis of organic P, microbial P accumulation, and microbial mineralisation rates of organic compounds, respectively. Soil chemical properties were characterised by C, N and P content, pH, and by oxalate-extractable P, Fe and Al. Spatial variability in NMB, PMB, Cmin and phosphatase activity within the catchment was higher (coefficient of variation, CV<50%) than their temporal variability (CV<30%). Multivariate analysis revealed a significant soil layer effect but not that of catchment. When soil layers were evaluated separately, a difference between the Plešné and Černé or Čertovo catchments was found in litter and mineral layers, even though the variability within one catchment was high. Within soil profile, phosphatase activity was positively correlated with Ctot, NMB and Cmin (r2=0,89-0,92) being very correlated with PMB (r2=0,99). Phosphatase activity was higher in the litter (14,0 nmol.g-1.h-1) and humus (8,65 nmol.g-1.h-1) layers of Plešné than in the same layers of the Černé (9.65 and 6,40 nmol.g-1.h-1) and Čertovo (12,8 and 6,0 nmol.g-1.h-1) soils. Similarly, PMB in the litter and humus layers of Plešné soil (161 and 93 µg.g-1) was higher than PMB of the same layers of the Černé (120 and 66 µg.g-1) and Čertovo (148 and 89 µg.g-1)soils. High MUFP hydrolysis rate: Cmin molar ratio (0,16-1,17 M or P per 1 M of respired C) indicated that potential enzymatic P hydrolysis exceeded estimated microbial P demand (0,034 M of P per 1 M of respired C) in all catchments. The results suggest that higher microbial P transformations and enzymatic P hydrolysis could contribute to enhanced P leaching from the Plešné catchment, which could be enhanced by the lower Fe content in the soil of this catchment as compared to the Černé and Čertovo catchments

    Byla studována biologická aktivita půd smrkových porostů v povodí šumavských ledovcových jezer (Černé, Čertovo a Plešné). Cílem studia bylo zjistit, zda vyšší vyplavování fosforu, které bylo zjištěno v povodí Plešného jezera souvisí s rozdílnou biologickou aktivitou a vyšší enzymatickou hydrolýzou fosforu v půdách Plešného jezera. Nebyly zjištěny významné rozdíly v biologické aktivitě, ale byla stanovena vyšší mikrobiální transformace i hydrolýza fosforu extracelulárními enzymy. Výsledky naznačují že mikrobiální transformace P se na zvýšeném vyplavování fosforu podílí. Vyplavování může být také zvýšeno nižším obsahem železa v půdách v povodí Plešného jezera v porovnání s ostatními studovanými povodími
    Trvalý link: http://hdl.handle.net/11104/0012693

     
     
Počet záznamů: 1  

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