Effects of long-term organic manure application on yield and water use efficiency of spring wheat and soil organic carbon in semi-arid area
Taking long-term positioning test in loessal soil of National soil quality stability observation and test station in Anding District of Gansu Province as the research object,the effects of long-term organic manure application on yield and water use efficiency of spring wheat and soil organic carbon in semi-arid area were explored.The results showed that fertilization had significant impact on yield and water use efficiency of spring wheat,and the effect of combined application of organic manure and chemical fertilizer(NPKM)was the best,compared with treatments of chemical fertilizer(NPK)and organic manure(OM),the yield and water use efficiency of spring wheat for NPKM were increased by 7.18%and 7.82%,5.91%and 3.83%,respectively,after seven years continuous planting of wheat.In the early stage of fertilization(the first three years),the effect of NPKM and NPK treatments were better than that of OM treatment,and there was no difference among the three treatments in the fourth year of continuous location fertilization,but the effect of NPKM and OM treatments were obviously better than that of applying chemical fertilizer(NPK)in the fifth year and after.Compared with NPK treatment,the content of organic carbon of long-term NPKM and OM treatments were increased significantly by 36.88%and 31.98%in 0-20 cm soil layer,and organic carbon reserves were increased significantly by 31.17%-41.94%and 27.80%-35.81%,respectively,and incremental effects of 0-10 cm surface layer was significantly better than that of 10-20 cm.The effects of different fertilization treatments on soil microbial biomass carbon(MBC)were as follows:NPKM＞OM＞NPK＞CK,there was significant difference between treatments,and soil MBC of NPKM and OM treatments were increased significantly by 46.4%and 28.7%,respectively,compared with NPK.Long-term single application of NPK could significantly improve the content of MBC,however,it had no obvious effect on the content of organic carbon.In conclusion,long-term NPKM or OM treatments can significantly increase the contents of total organic carbon and microbial biomass carbon of the loessal soil in dryland,and increase organic carbon storage and promote the sequestration of farmland soil carbon,and improve yield and water use efficiency of spring wheat.
semi-arid areaorganic manurespring wheatyieldwater use efficiencysoil organic carbonmicrobial biomass carbon
NETL
NSTL
万方数据
