Demanou Joseph, Monkiéjé Adolphe, Njin Thomas, Foto Samuel M, Nola Moise, Togouet Serges H Zebaze, Kemka Norbert
Laboratory of General Biology, Department of Animal Biology and Physiology, Faculty of Science, University of Yaounde I, Republic of Cameroon.
Int J Environ Res Public Health. 2004 Mar;1(1):26-34. doi: 10.3390/ijerph2004010026.
The purpose of the study was to investigate changes of soil chemical and biological properties changes resulting from a single application of the fungicide Ridomil Gold plus copper (Ridomil Gold plus)(mefenoxam 6% + copper oxide 60%) at the following rates 0.25, 0.5, 1, 2, and 10 g m(-2). Selected chemical properties generally differed between fungicide rates over longer incubation periods. Microbial activity indices (available N, ammonification rates and specific enzymatic systems) were more sensitive indicators of change. Values of these indicators generally increased with incubation period and decreased or increased at high rates. Significant changes in P availability occurred after 90 days of incubation at rates > or = 1 g m(-2). Incorporation of the fungicide significantly increased NH4+ levels in soil after 75 days of incubation. These changes stimulated soil microbial activity as evidenced by increased ammonification rates especially at long-term exposure. Of the enzyme activities studied, dehydrogenase and beta-glucosidase activities were the most sensitive to ridomil gold plus. This sensitivity was more pronounced with the dehydrogenase activity.
本研究的目的是调查单次施用杀真菌剂金雷多米尔加铜（金雷多米尔加）（甲霜灵6%+氧化铜60%），施用量分别为0.25、0.5、1、2和10 g m(-2)时土壤化学和生物学性质的变化。在较长的培养期内，选定的化学性质通常因杀真菌剂施用量不同而有所差异。微生物活性指标（有效氮、氨化率和特定酶系统）是更敏感的变化指标。这些指标的值通常随培养期增加，在高施用量时下降或上升。在施用量≥1 g m(-2)的情况下，培养90天后有效磷含量发生显著变化。培养75天后，杀真菌剂的掺入显著提高了土壤中的铵离子水平。这些变化刺激了土壤微生物活性，尤其是在长期暴露下，氨化率增加证明了这一点。在所研究的酶活性中，脱氢酶和β-葡萄糖苷酶活性对金雷多米尔加最为敏感。这种敏感性在脱氢酶活性方面更为明显。
