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选择章古台地区三块典型樟子松(Pinussylvestrisvar.mongolica)人工固沙林为研究对象,采用实验室好氧培养法测定了不同土壤层次和在不同水分条件下的N矿化过程。结果表明:土壤0-60cm层N净矿化速率垂直变化范围为1.06–7.52mg·kg-1·month-1;土壤层次和含水量及其交互作用对土壤N净矿化速率的影响均达到差异显著(P<0.05);净矿化速率随着土壤层次的加深而明显下降,0-15cm层占总净矿化量的60.52%;半饱和与饱和含水量处理差异不显著,但均高于不加水处理。为此,在半干旱地区必须进一步加强开展调控生态系统N矿化、循环及其收支平衡影响因素的研究。图1表4参20。
Three typical Pinus sylvestris var. Mongolica artificial sand-fixation forests in Zhanggutai area were selected as research objects. N mineralization process under different soil layers and water conditions was determined by laboratory aerobic culture. The results showed that the N net mineralization rate ranged from 1.06 to 7.52 mg · kg-1 · month-1 in 0-60cm soil layer. The effect of soil water content and its interaction on N net mineralization rate reached (P <0.05). The net mineralization rate decreased obviously with the deepening of the soil layer, while the 0-15cm layer accounted for 60.52% of the total net mineralization. The differences between the semi-saturated and saturated water treatments were not significant, but both were high Without water treatment. Therefore, in the semi-arid area, we must further strengthen the research on the factors affecting the regulation and control of mineralization, circulation and balance of ecosystem N. Figure 1 Table 4 Reference 20.