摘要
基于在褐土条件下长期定位施肥试验,通过对8个不同试验处理的土壤养分动态监测,探讨褐土长期施肥对土壤有机质、氮动态变化的影响,以期为该类型区域合理施肥提供理论依据。结果表明,在连续施肥25 a后,不同施肥处理土壤有机质、氮含量均发生了明显改变,其中,不施肥处理土壤全氮含量较试验初下降了19%;有机无机配施可以显著提高土壤全氮含量,N 120 kg/hm^2+P2O537.5 kg/hm^2+有机肥22.5 t/hm^2(N2P1M1)、N 180 kg/hm^2+P2O575 kg/hm^2+有机肥67.5 t/hm^2(N3P2M3)、N 240 kg/hm^2+P2O575 kg/hm^2+有机肥45 t/hm^2(N4P2M2)这3个施肥处理较不施肥处理分别增加了44.7%,21.3%和74.5%;施肥各处理土壤碱解氮含量均较不施肥处理显著增加,且变化趋势与氮肥施用量密切相关,会随着无机肥投入量的增加而增加,当氮磷有机肥配施时土壤碱解氮增加更为显著,N3P2M3处理较不施肥处理20 a间平均提高了51.13%;氮磷有机肥配施土壤有机质含量均高于施用氮磷化肥处理,并随着有机肥投入量的增加而增加,N3P2M3与N4P2M2处理的有机质含量明显高于其他各处理,分别比不施肥增加了59.6%和38.1%。
To provide theoretical basis for rational fertilization in this type of area,the effects of long-term fertilization on soil organic matter and nitrogen dynamics were studied by monitoring the soil nutrient dynamics of 8 different treatments under the long-term fertilization in cinnamon soil.The results showed that after 25 years of continuous fertilization,soil organic matter and nitrogen were significantly changed under different fertilization treatments.The total nitrogen content of the soil innon-fertilizer treatment decreased by 19%compared with the initial test.Organic and inorganic fertilizer combined treatments could significantly improve the total nitrogen content of the soil,which increased by 44.7%,21.3%and 74.5%,respectively,in treatment N2P1M1,N3P2M3 and N4P2M2,compared with the treatment without fertilization.The content of alkali-hydrolyzale nitrogen in soil under fertilization treatments was significantly higher than that under no fertilization treatment.In addition,the change trend was closely related to the amount of applied nitrogen fertilizer,which would increase with the increase of the input amount of inorganic fertilizer.When nitrogen,phosphorus and organic fertilizers were applied together,the increase of soilalkali-hydrolyzale nitrogen was more significant,which increased by 51.13%on average in 20 years in treatment N3P2M3 compared with the treatment without fertilizer.The content of organic matter in soil combined with nitrogen,phosphorus and organic fertilizer was higher than that of nitrogen and phosphorus fertilizer alone,which increased with the increase of the input of organic fertilizer.The content of organic matter in treatments N3P2M3 and N4P2M2 were significantly higher than that in the other treatments,which increased by 59.6%and 38.1%,respectively,compared with that in the treatment without fertilization.
作者
杨振兴
周怀平
解文艳
刘志平
YANG Zhenxing;ZHOU Huaiping;XIE Wenyan;LIU Zhiping(Institute of Agricultural Environment and Resources,Shanxi Academy of Agricultural Sciences,Taiyuan 030031,China)
出处
《山西农业科学》
2019年第12期2131-2134,共4页
Journal of Shanxi Agricultural Sciences
基金
山西省重点研发计划重点项目(201703D211002-3)
关键词
长期定位施肥
有机质
氮
褐土
long-term located fertilization
organic matter
nitrogen
cinnamon soil
