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研究了湖南省会同县森林植被从地带性植被天然常绿阔叶林到杉木人工林再到杉木火力楠混交林的转变过程中土壤微生物生物量碳和酶活性的变化趋势。结果表明:杉木纯林和混交林土壤微生物生物量碳含量均显著低于常绿阔叶林,分别仅为常绿阔叶林的76.8%和71.5%;与天然阔叶林相比,杉木人工林土壤蔗糖酶、脲酶和磷酸酶活性分别降低了35.8%、22.1%和45.1%,而多酚氧化酶活性增高了40.0%;相反,杉木火力楠混交林土壤蔗糖酶、脲酶和磷酸酶活性比杉木纯林分别增加了20.3%、12.6%和67.8%,而土壤多酚氧化酶活性则降低了41.0%;表明森林植被转变对土壤微生物生物量碳和土壤酶活性能够产生较大的影响,不同的树种对土壤微生物生物量碳和土壤酶活性的影响差异较大。
The change trend of microbial biomass C and enzyme activities in the forest vegetation of Huitong County, Hunan Province, from the natural evergreen broad-leaved forest zone with zonal vegetation to the Chinese fir plantation and then with C. mongolica mixed forest was studied. The results showed that the contents of soil microbial biomass C were significantly lower than those of the evergreen broad-leaved forest, which were only 76.8% and 71.5% of the evergreen broad-leaved forest, respectively. Compared with the natural broad-leaved forest, The activity of soil invertase, urease and phosphatase decreased by 35.8%, 22.1% and 45.1%, while the activity of polyphenol oxidase increased by 40.0%. On the contrary, the activities of soil invertase, urease and phosphatase were higher than those of Chinese fir The pure forest increased by 20.3%, 12.6% and 67.8%, while the soil polyphenol oxidase activity decreased by 41.0%. It showed that the forest vegetation change had a greater impact on soil microbial biomass carbon and soil enzyme activity, The effects of tree species on soil microbial biomass carbon and soil enzyme activity varied greatly.