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测定黑土肥力长期定位监测试验基地土壤的热水提取态有机碳(HWC-C),研究不同施肥制度对HWC-C的影响。结果表明,HWC-C含量随氮肥和磷肥施用量的增加而有所减小,常量氮肥、二倍量氮肥、常量磷肥、二倍量磷肥处理土壤的HWC-C含量分别为234、228、245、223mgkg-1。土壤HWC-C含量随有机肥施入量的增加而增大,二倍量有机肥、常量有机肥处理的HWC-C含量分别是对照处理的1.96和1.11倍。无机肥混施能增加土壤HWC-C含量,常量氮磷钾肥混施处理HWC-C含量分别比常量磷钾肥混施、常量氮磷肥混施、常量氮钾肥混施处理增加14.4%、11.9%、0.06%。在无机肥混施的基础上增施有机肥可增加HWC-C含量。有机肥与化肥混施,尤其有机肥与氮磷钾肥混施,不仅可以使土壤的肥料结构更加合理,还可有效地增加土壤的HWC-C含量。
The hot-water extracted organic carbon (HWC-C) of soil in black soil fertility long-term position monitoring test base was measured to study the effect of different fertilization systems on HWC-C. The results showed that the content of HWC-C decreased with the increase of N and P application rates. The HWC-C contents of soil treated with constant nitrogen, double nitrogen, constant phosphorus and doubled phosphorus were 234,228,245 , 223 mg kg-1. The content of HWC-C in soil increased with the increase of organic manure application. The contents of HWC-C in twice-organic manure and organic manure were 1.96 and 1.11 times of the control respectively. The HWC-C content was increased by the combination of inorganic fertilizer and HWC-C content by constant N, P and K treatments, respectively. 0.06%. The application of organic fertilizer on the basis of inorganic fertilizer can increase HWC-C content. Mixture of organic fertilizer and chemical fertilizer, especially organic fertilizer and NPK fertilizer mix, not only make the soil fertilizer structure more reasonable, but also effectively increase the soil HWC-C content.