摘要
利用开始于1979年的黑土长期定位试验,研究长期不同施肥措施下土壤有机碳含量演变特征、固碳效应及外源碳输入对土壤固碳的贡献。结果表明：长期单施化肥土壤有机碳含量较试验前下降了11.6%~16.1%,有机肥与化肥配施土壤有机碳含量呈上升趋势,常量有机肥化肥配施（MNP、MNPK）土壤有机碳含量分别上升了6.5%和8.4%,二倍量有机肥化肥配施（M2N2、M2N2P2）土壤有机碳含量分别上升了7.7%和11.6%。不施肥和施化肥土壤有机碳储量呈现亏缺,亏缺量在3.5~6.1t/hm2。有机肥与化肥配施土壤有机碳储量表现为盈余,M2N2P2处理盈余量最高,达到1.9t/hm2。年均有机碳投入量与土壤固碳速率呈显著的线性正相关,表明黑土仍具有一定的固碳潜力。黑土碳投入的转化效率为34.1%,若要维持黑土有机碳库平衡,则每年至少投入1.416t/hm2有机碳。可见,在黑土区增加土壤碳投入（有机肥）仍然是最有效的土壤固碳措施。
Based on a long-term experiment during 1979—2014 with various fertilizations in black soil of northeast China,the objective of this study was to research evolution characteristics of soil organic carbon（SOC）content,carbon sequestration and its cooperation with carbon input.The results showed that：Compared to the initial soil condition,SOC content in long-term chemical fertilizers application（N,NP,NPK,N2）decreased by 11.6%~16.1%,while the SOC content in long-term horse manure application significantly increased.Chemical fertilizers application plus horse manure with conventional application rates（MNP,MNPK）or doubleness（M2N2,M2N2P2）could increase SOC content 6.5%,8.4%,7.7% and 11.6%,respectively.The carbon sequestration in the treatment of non-fertilization（CK）and chemical fertilizers application appeared deficit,ranged from 3.5~6.1t/hm2.In contrast,SOC storage in the treatment of chemical fertilizers application plus horse manure showed surplus,and the maximum value was 1.9t/hm2（M2N2P2）.There was a significantly positive linear correlation between annual average organic C input and C sequestration efficiency,which showed that black soil still had potential carbon sequestration.The calculated annual transform rate of input carbon was about 34.1%,and the least carbon input for maintaining the initial organic carbon level was about 1.416t/hm2.Therefore,increasing carbon input（manure）was a key to improve carbon sequestration in black soil region.
出处
《水土保持学报》
CSCD
北大核心
2016年第5期316-321,共6页
Journal of Soil and Water Conservation
基金
国家科技支撑计划(2013BAD11B03
2013BAD07B01)
国家公益性行业(农业)科研专项(201203030
201303126)
黑龙江省农业科学院引进博士人员科研启动金项目(201507-23)
关键词
长期施肥
土壤有机碳
有机碳储量
固碳效应
黑土
long-term fertilization
soil organic carbon content
soil organic carbon storage
carbon sequestration
black soil
