中文摘要：

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。

英文摘要：

Hot-water extractable carbon （HWC） was determined in arable black soils sampled from a different long-term fertilization experiment zone in Heilongjiang Academy of Agricultural Sciences. The results showed that soil HWC-C content decreased with the increase of nitrogen or phosphorus fertilizer application, and HWC-C contents of normal nitrogen fertilization （N1）, duple nitrogen fertilization （N2）, normal phosphorus fertilization （P1）, duple phosphorus fertilization （P2） were 234, 228, 245, 223 mg kg^-1, respectively. Soil HWC-C contents increased with the increase of organic manure application, the HWC-C contents of duple organic manure fertilization （M2）, normal organic manure fertilization （M1） were as 1.96 and 1.11 times as control （CK）, respectively. All of the treatments of combined fertilizers could significantly increase soil HWC-C content, but there was no significant difference between each treatment. Treatment of N1-P1-K1 （N1P1K1） greatly improved more soil HWC-C than other treatments of combined fertilizers. When compared with N1P1, P1K1 and N1K1, the soil HWC-C contents of N1-P1-K1 increased 14.4%, 11.9% and 0.06%, respectively. Soil HWC-C greatly increased when organic manure applied with combined fertilizers, and the soil HWC-C contents of M1 plus N1P1, M1 plus N1K1, M1 plus P1K1 and M1 plus N1P1K1 were 54.1, 22.7, 10.9, 11.7 and 47.7 mg kg-1 more than N1P1, N1K1, P1K1 and N1P1K1, respectively. Combined manure and chemical fertilizers, especially the treatment of combined organic manure and fertilizer NPK, could balance the soil nutrient and effectively increase the soil HWC-C content.