采用微型渗漏计原位测定设施菜田有机肥氮素矿化特征

采用微型渗漏计进行设施菜田原位培养，分别在培养前期不种作物和后期种植作物研究不同鸡粪用量、鸡粪加秸秆混施和堆肥处理的氮素矿化特征。结果表明：不同处理的氮素矿化量和矿化系数存在明显差异。种植作物前，氮素矿化系数在-1.17%～2.67%之间，高量鸡粪处理的无机氮淋洗量、氮素矿化量和矿化系数显著高于堆肥处理|种植作物明显刺激氮素矿化，其矿化系数在3.45%～53.22%之间|添加鸡粪处理的氮素矿化量随鸡粪用量的增加而增加，高量鸡粪处理显著高于高量鸡粪加秸秆、低量鸡粪和堆肥处理，添加秸秆有明显的固氮作用。种植普通白菜后，高量鸡粪处理的氮素矿化系数比种植普通白菜前增加了50.55个百分点。

Mineralization Characteristics of Organic Manure Nitrogen in Protected Vegetable Fields using In-situ Micro-lysimeter

Using In-situ method of micro-lysimeter the characteristics of manure N mineralization was investigated with different rate of chicken manure，straw mixed with chicken manure，compost with/without crop planting at incubation prophase．The results showed that there were obvious differences in the N mineralization amount and mineralization coefficient among different treatments．Before planting crops，the N mineralization coefficient ranged from -1.17% to 2.67%．The amount of leached N，mineralized N amount and N mineralization coefficient in high rate of chicken manure treatment was significantly higher than those in the treatments of different compost product．Crop planting significantly stimulated N mineralization．Its mineralization coefficient was 3.45% to 53.22%．The N mineralization amount increased with the increase of chicken manure amount in chicken manure treatment．The mineralized N in high rate of chicken manure treatment was significantly higher than those of chicken manure mixed with straw treatment，low rate of chicken manure treatment，and compost treatment．The coefficient of manure N mineralization in the treatment with high rate of chicken manure after planting crop was 50.55 percentage point higher．