CAJ | 학술논문

氮肥的施用会影响作物生物量，从而影响进入土壤中的有机碳的量，影响土壤有机碳的稳定性和积累。该研究在定位试验的基础上，结合2种酸解法，分析了不同施氮水平下黑土中土壤酸水解碳和酸解残留碳的变化，以揭示不同氮肥处理对草甸黑土有机碳化学稳定性的影响。试验设置5个处理，包括不施氮肥（N0）、优化施氮70％（N168）、优化施氮（N240）、传统高量施氮（N270）、优化施氮130％（N312）。结果表明：2种酸解法获得的有机碳组分结果变化趋势基本一致。施用氮肥增加了土壤有机碳含量，4个施氮处理有机碳含量显著高于N0（ P＜0?05），N240处理有机碳含量最高；施用氮肥提高了土壤中易酸解有机碳的含量，不同施肥处理中N240处理含量最低，N312处理含量最高，但施氮处理间差异不显著（ P＞0?05）；施用氮肥降低了土壤难降解有机碳的含量，N240处理显著高于其他处理（ P＜0?05），N240处理土壤有机碳活性指数与N0的相近，低于其他氮肥处理，N270显著提高了土壤有机碳活性指数（ P＜0?05），而N312显著降低了土壤难降解有机碳指数（ P＜0?05）。施用氮肥通过增加土壤活性有机碳含量来增加土壤有机碳的含量，合理的氮肥用量可以增加土壤中难降解有机碳指数，提高有机碳的化学稳定性。可以通过合理施用氮肥来调控草甸黑土有机碳含量及其稳定性。
담비적시용회영향작물생물량，종이영향진입토양중적유궤탄적량，영향토양유궤탄적은정성화적루。해연구재정위시험적기출상，결합2충산해법，분석료불동시담수평하흑토중토양산수해탄화산해잔류탄적변화，이게시불동담비처리대초전흑토유궤탄화학은정성적영향。시험설치5개처리，포괄불시담비（N0）、우화시담70％（N168）、우화시담（N240）、전통고량시담（N270）、우화시담130％（N312）。결과표명：2충산해법획득적유궤탄조분결과변화추세기본일치。시용담비증가료토양유궤탄함량，4개시담처리유궤탄함량현저고우N0（ P＜0?05），N240처리유궤탄함량최고；시용담비제고료토양중역산해유궤탄적함량，불동시비처리중N240처리함량최저，N312처리함량최고，단시담처리간차이불현저（ P＞0?05）；시용담비강저료토양난강해유궤탄적함량，N240처리현저고우기타처리（ P＜0?05），N240처리토양유궤탄활성지수여N0적상근，저우기타담비처리，N270현저제고료토양유궤탄활성지수（ P＜0?05），이N312현저강저료토양난강해유궤탄지수（ P＜0?05）。시용담비통과증가토양활성유궤탄함량래증가토양유궤탄적함량，합리적담비용량가이증가토양중난강해유궤탄지수，제고유궤탄적화학은정성。가이통과합리시용담비래조공초전흑토유궤탄함량급기은정성。
Nitrogen fertilizer significantly influences crop biomass, which will affect the amount of organic carbon into soil and soil carbon stability and accumulation. Based on located experiments, combining with two kinds of acid hydrolysis, this study analyzed the changes of soil acid hydrolysis carbon and residual carbon from acid hydrolysis under different nitrogen levels in black soil, to re? veal the effects of different nitrogen treatments on chemical stability of meadow soil organic carbon. Five treatments were designed, including no application of N fertilizer(N0), 70% optimized appli?cation of N fertilizer(N168), optimized application of N fertilizer(N240), traditional high?amount application of N fertilizer(N270) and 130% optimized application of N fertilizer(N312). The re?sults showed that the changing trends of the organic carbon components obtained with the two hydrol?ysis methods were mainly consistent. Nitrogen fertilizer on the whole contributed to accumulation of total organic carbon in soil. Application of N fertilizer increased the content of organic carbon, the content of organic carbon under the four treatments was higher than N0(P<0.05 ), and N240 got the highest organic carbon content;The content of easy acid hydrolysis organic carbon increased un?der all the treatments, in which N312 showed the highest content while N240 showed the lowest con?tent, however, there were no significant differences among the N treatments (P>0.05).Application of N fertilizer decreased the content of soil recalcitrance organic carbon, and N240 was significantly higher than other treatments(P<0.05). Indexes of organic carbon activity of N240 were similar to those of NO, but lower than other treatments. Recalcitrance index(RIC) rose significantly in N270 but lower in N240 and N0(P<0.05). Labile index(LIC ) of organic carbon significantly(P<0.05) increased in N270, but fell significantly in N312. Obviously the contribution of N fertilizer application is to increase the content of soil organic carbon by increasing the content of active organic carbon. Reasonable amount of N fertilizer can increase recalcitrance index(RIC) and improve the chemical stability of organic carbon. Therefore, content and stability of meadow soil organic carbon can be manipulated by optimizing N fertilizer application.