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本研究测定了浙江省一些林场内杉木林地杉木根际和非根际土壤的微生物数量和酶活性。结果指出,杉木根际和非根际土壤中的微生物以细菌为主,其中氨化细菌占有较大数量。杉木根际土壤的细菌、放线菌和真菌数量都显著地高于非根际土壤。脲酶、蔗糖酶、磷酸酶脱氢酶和纤维素酶活性也有同样趋势,但多酚氧化酶则相反。根际微生物数量和酶活性与土壤化学性质有关。杉木连栽显著地降低根际微生物数量和脱氢酶、纤维酶活性,但增大了多酚氧化酶活性。这表明降低了生物化学活性。而这又会引起根际养分不足和有毒物质积累,导致连栽杉木较低的生长速率。
This study determined the microbial population and enzyme activity in the rhizosphere and non-rhizosphere soil of Chinese fir plantations in some forest farms in Zhejiang Province. The results indicated that the microorganisms in the rhizosphere and non-rhizosphere soil of the Chinese fir were dominated by bacteria, of which ammoniated bacteria accounted for a large amount. The number of bacteria, actinomycetes and fungi in the rhizosphere soil of Chinese fir was significantly higher than that of non-rhizosphere soil. Urease, sucrase, phosphatase dehydrogenase and cellulase activity also have the same trend, but the polyphenol oxidase is the opposite. The number of rhizosphere microbes and enzyme activity were related to soil chemical properties. Cunninghamia lanceolata decreased significantly the number of rhizosphere microbes and the activity of dehydrogenase and cellulase, but increased the activity of polyphenol oxidase. This shows reduced biochemical activity. This, in turn, can cause nutrient deficiencies in the rhizosphere and accumulation of toxic substances, resulting in lower growth rates even for Chinese fir.