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Mineralization of nitrogen compounds in soils of south-taiga ecosystems

机译：南针叶林生态系统土壤中氮化合物的矿化作用

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The productivity of the nitrogen mineralization in the A0 (0-2 cm), A1 (2-3 cm), and A2 (3-13 cm) horizons of a soddy-podzolic soil was measured in a wood-sorrel-whortleberry birch forest (7Birch3Asp, 80 years, the second stand quality class, tree canopy density 0.7, Yaroslavl oblast) using the sample incubation method; the measurements were performed from May till October in eight replicates for each horizon. In 2007, 5.85 +/- 0.73 g N/m(2) were mineralized in the soil. In the litter, 2.01 +/- 0.23 g N/m(2) were mineralized, whereas 0.35 +/- 0.03 and 3.49 +/- 0.72 g N/m(2) were mineralized in the A1 and A2 horizons, respectively. In 2008, 3.34 +/- 0.25 g N/m(2) were mineralized in the A0 and A1 horizons, of which 2.44 +/- 0.23 g N/m(2) were in the former. Ammonification prevailed in all the horizons. The contribution of nitrification was assessed as 1.6 and 0.3% of the process's productivity in 2007 and 2008, respectively. The C-org and N-org pools decreased in the litter by 407 g C/m(2) and 13.7g N/m(2) (or 33%) from May to October. Of this carbon amount, 67% is spent for humification and the organic mass preservation and 33% was transformed to carbonic acid. The nitrogen expenses for the synthesis of humus acids are equal to 70 and 30%; it is spent equally for the mineralization of the element and its immobilization by microorganisms. In the A0 and A1 horizons, the seasonal trends of the ammonification correlated with the carbon dioxide emission from these horizons in the year of 2008 with r = 0.75 atp = 0.09 and r = 0.82 atp = 0.04 for both horizons, respectively.
机译：在wood浆草-越橘桦木林中，测量了田间土壤A0（0-2 cm），A1（2-3 cm）和A2（3-13 cm）层中氮矿化的生产力。 （7Birch3Asp，80年，第二类质量等级，树冠密度0.7，雅罗斯拉夫尔州），采用的是样品孵化方法;从5月到10月，每个视野进行了8次重复测量。 2007年，土壤中矿化了5.85 +/- 0.73 g N / m（2）。在垫料中，分别在A1和A2层矿化了2.01 +/- 0.23 g N / m（2），而0.35 +/- 0.03和3.49 +/- 0.72 g N / m（2）矿化了。 2008年，A0和A1层矿化了3.34 +/- 0.25 g N / m（2），前者为2.44 +/- 0.23 g N / m（2）。氨化盛行于各个领域。在2007年和2008年，硝化作用分别占该工艺生产力的1.6％和0.3％。从5月到10月，垫料中的C-org和N-org池减少407 g C / m（2）和13.7g N / m（2）（或33％）。在该碳量中，有67％被用于腐殖化和有机物的保存，而33％被转化为碳酸。合成腐殖酸的氮费用分别为70％和30％。它平均用于元素的矿化和微生物的固定化。在A0和A1层，氨化的季节趋势与这些层在2008年的二氧化碳排放量相关，两个层的r分别为r = 0.75 atp = 0.09和r = 0.82 atp = 0.04。

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