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采用室内培养方法研究了持续添加不同浓度葡萄糖溶液(0、75、150和225μg g-1,以土壤中C浓度计,下同)对不同养分状况的油松和连香树林地土壤氮转化过程的影响.结果显示,在培养的56 d里,持续添加75μg g-1的葡萄糖溶液有效促进了油松林土壤氮净矿化,持续添加150μg g-1的葡萄糖溶液在培养后期促进了油松林土壤氮净矿化,而持续添加225μg g-1的葡萄糖溶液在整个培养期内显著抑制油松林土壤氮净矿化.3个浓度的碳源持续添加处理均降低了油松林土壤可溶性有机氮含量,仅在第56天时,高浓度碳添加处理油松林土壤可溶性有机氮与对照处理差异不显著.3个浓度的碳源持续添加处理对油松林土壤微生物量氮变化的影响有所不同.对于连香树林土壤,3个浓度的碳源持续添加处理均显著促进了氮的净矿化,在培养后期不同程度地增加了可溶性有机氮的含量.研究结果表明不同林地土壤氮转化对持续外加可溶性碳源的响应过程有所不同,养分状况较差的土壤的响应模式更为复杂.
The effects of different concentrations of glucose solution (0, 75, 150 and 225 μg g -1) on the soil nitrogen conversion processes of Pinus tabulaeformis and Lianxiang woodland under different nutrient conditions were studied by indoor culture method. The results showed that continuously adding 75μg g-1 glucose solution effectively promoted soil N net mineralization in Pinus tabulaeformis forest during the 56th day of culture. Continuous addition of 150μg g-1 glucose solution promoted Pinus tabulaeformis forest soil Nitrogen net mineralization, and continuous addition of 225μg g-1 glucose solution significantly inhibited the net nitrogen mineralization in Pinus tabulaeformis forest during the whole incubation period.The soil organic carbon content in Pinus tabulaeformis forest decreased with continuous addition of three carbon sources, Only on the 56th day, there was no significant difference in the soil dissolved organic nitrogen between the treatments with high carbon concentration and the control treatments. The effects of three carbon sources on the soil microbial biomass nitrogen were different, In the forest soil, the continuous addition of three carbon sources significantly promoted the net mineralization of nitrogen, and increased the content of soluble organic nitrogen in different degrees in the late stage of cultivation. Soil conversion of nitrogen plus sustained response process different soluble carbon source nutrient status of soil poor response mode is more complex.