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本文研究了不同林型下土壤(A+6层和A_1层)微生物、土壤酶活性在森林土壤氮转化中的作用。结果表明不同林型下土壤具有不同的固氮作用、反硝化作用、氨化作用和硝化作用速率,即阔叶林>针阔混交林>针叶林。已经证明,固氮作用主要存在于森林土壤的A_1层,反硝化作用主要存在于A_0层。森林土壤存在2种硝化作用过程,即由自养微生物所引起的自养硝化作用过程和异养微生物所引起的异养硝化作用过程。它的存在与林型有关,某些森林土壤中这2种硝化作用过程都存在,如针阔混交林下的A_0层和A_1层。有些林型下土壤,则以异养硝化作用过程为主,如针叶林的A_0层。
In this paper, the effects of soil enzyme activities on nitrogen transformation in forest soils under different forest types (A 6 and A 1) were studied. The results showed that the soil under different forest types had different functions of nitrogen fixation, denitrification, ammonification and nitrification, that is, broad-leaved forest> mixed coniferous and broad-leaved forest> coniferous forest. It has been demonstrated that nitrogen fixation is mainly present in the A_1 layer of forest soils, and denitrification is mainly present in the A_0 layer. There are two kinds of nitrification processes in forest soils, that is autotrophic nitrification caused by autotrophic microorganisms and heterotrophic nitrification caused by heterotrophic microorganisms. Its existence is related to the forest type. The nitrification process exists in some forest soils, such as the A_0 layer and the A_1 layer under the mixed coniferous and broadleaf forest. Some of the forest under the soil, the heterotrophic nitrification process is dominated, such as coniferous forest A_0 layer.