Characteristics of salt accumulation and composition change in facilities in Beijing suburbs
In view of the phenomenon of secondary salinization in the soil of facilities in suburban areas of Beijing,the soil salt accumulation and composition changes in the large-scale facilities parks in Fangshan,Yanqing,Miyun,Daxing and Changping were studied by random sampling method in the field,in order to provide reference for the scientific management of facilities cultivation and efficient fertilization.The results showed that the total salt content of 79%soil samples was≥2.0 g/kg,the conductivity of 69.3%soil samples was≥50 mS/m,and the secondary salinization trend was obvious.The concentration of salt ions in the monitoring parks was enriched to a certain extent,and the accumulation of salt ions in different regions was different.In addition to HCO3-,the accumulation of K+,Na+,Ca2+,Mg2+,Cl-,SO42-and NO3-all resulted in soil secondary salinization to a certain extent,in which the cations were mainly Ca2+and Mg2+,and the anions were mainly SO42-and NO3-.The soil salinity in Beijing suburban facilities mainly existed in the form of nitrate and sulfate.The phenomenon of salt accumulation existed in the suburbs of Beijing.It was suggested to carry out the screening and quality inspection of organic fertilizers and strengthen the management of water and fertilizer to avoid aggravating the degree of soil secondary salinization.In facility production,we should not only pay attention to economic benefits,but also pay attention to the health of soil in order to achieve the sustainable development goal of facility production.
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万方数据
