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为了解土壤和植被界面的有机碳库和生化特性,分别将以云杉(Picea purpurea Masters)(SF)、冷杉(Abies faxoniana Rehder&E.H.Wilson)(FF)和白桦(Betula platyphylla Sukaczev)(BF)为优势树种的3个亚高山森林地表有机层(OL)分成新鲜凋落物层(LL)、半分解层(FL)和分解层(HL),并同步测定了有机层和矿质土壤层(MS)的有机碳(OC)储量、微生物生物量碳(Cmic)、微生物生物量氮(Nmic)及转化酶、过氧化氢酶、脱氢酶和多酚氧化酶活性。云杉林、冷杉林和白桦林土壤有机层的有机碳储量分别为29.38Mghm-2±1.28Mghm-2、22.7Mghm-2±1.12Mghm-2和8.63Mghm-2±0.95Mghm-2,分别为总有机碳储量的62.2%、53.5%和36.6%。云杉林、冷杉林和白桦林土壤有机层和腐殖质层分别储存了92.8%、99.6%和78.7%的有机碳。所有林型中,HL具有最高的细菌数量、Cmic和Nmic及过氧化氢酶活性,FL具有最高的真菌、放线菌数量及转化酶、脱氢酶和多酚氧化酶活性。微生物数量、微生物生物量和酶活性的垂直分布格局意味着OL是土壤和植被之间最活跃的生态界面之一。
In order to understand the organic carbon pool and the biochemical characteristics of the soil and vegetation interface, Picea purpurea Masters (SF), Abies faxoniana Rehder & E.H. Wilson (FF) and Betula platyphylla Sukaczev (BF ) As the dominant tree species were divided into fresh litter layer (LL), semi-decomposed layer (FL) and decomposing layer (HL), and organic layer and mineral soil layer (OC), Cmic, Nmic and invertase, catalase, dehydrogenase and polyphenol oxidase activities in the field. The organic carbon storage of spruce, fir and birch soils were 29.38Mghm-2 ± 1.28Mghm-2,22.7Mghm-2 ± 1.12Mghm-2 and 8.63Mghm-2 ± 0.95Mghm-2, respectively 62.2%, 53.5% and 36.6% of total organic carbon stocks. Soil organic and humus layers of spruce, fir and birch forests each stored 92.8%, 99.6% and 78.7% organic carbon, respectively. Among all forest types, HL had the highest bacterial counts, Cmic and Nmic and catalase activities, and FL had the highest fungal and actinomycete numbers as well as invertase, dehydrogenase and polyphenol oxidase activities. The vertical distribution pattern of microbial biomass, microbial biomass and enzyme activity means that OL is one of the most active ecological interfaces between soil and vegetation.