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温度是调节许多陆地生物化学过程中如:土壤呼吸,腐殖质的分解,净氮矿化和硝化过程的一个关键因素。据推测空气和土壤温度增加会提高微生物的转化率,增加腐殖质的分解,净氮矿化,导致碳氮在森林地表腐殖质的螯合作用。为了探求温度对生物化学过程的数量化影响,连续三个月在德国索尔林场,初步调查三种林(三毛榉,挪威云杉和混合树种)地表腐殖质变化率。结果表明所有试验地点中森林地表腐殖质层温度敏感度与氮矿化的关系曲线都显正相关。在试验林地中测得了全部数据,温度敏感度值(2.35-2.44)与影响试验地的氮矿化的温度相符。各树种林地表层土质量的差异不影响森林地表腐殖质层生物化学特性的变化。温度上升增加了氮矿化作用。但温度在1-15oC范围时,微生物状态无明显变化。比较在20°C条件下,微生物碳和有机碳之比较低,表明,微生物明显减少,可利用分解物减少。图3表7参42。
Temperature is a key factor in regulating many terrestrial biochemical processes such as soil respiration, decomposition of humus, net nitrogen mineralization and nitrification. It is speculated that increased air and soil temperature will increase microbial conversion, increase humic decomposition, and net nitrogen mineralization, leading to the chelation of carbon and nitrogen on the surface humus. In order to explore the quantitative effects of temperature on the biochemical processes, the rate of change of surface humus in three forests (Trichos, Norwegian spruce and mixed tree species) was investigated for three months in a row in Sollön, Germany. The results show that the temperature sensitivity of the forest surface humus layer and the relationship curve of nitrogen mineralization are positively correlated in all test sites. All the data were measured in the experimental forestland, and the temperature sensitivity values (2.35-2.44) were consistent with those of the nitrogen mineralization that affected the test sites. The differences in the quality of the topsoil between the forest tree species did not affect the biochemical characteristics of the forest surface humus layer. Increasing temperature increases nitrogen mineralization. However, when the temperature is in the range of 1-15oC, there is no obvious change in microbial status. Comparing at 20 ° C, the ratio of microbial carbon to organic carbon is low, indicating that the number of microorganisms is significantly reduced and the amount of available decomposition products is reduced. Figure 3 Table 7 参 42.