Drip Irrigation With Plastic And Organic Fertilizer Effect On Change Characteristics Of Soil Organic Carbon Research

Film drip irrigation cropping patterns are developed to cope with water shortages and the low efficiency of water use in traditional irrigation. The film drip irrigation technology can not only significantly change the characteristics of soil, but also fully help us understand and improve soil structure. With the continuous development of research, the study of the soil under film drip irrigation is becoming more thorough.Film drip tillage can increase soil moisture, maintain soil temperature, accelerate element transformation in soil, and increase the content of organic matters in soil.However, most existing studies focus on the content of organic matters in soil while little research examines the impact of the drip irrigation technology on the organic carbon in soil. But this impact is crucial for people to fully understand and use the drip irrigation technology. Therefore, this paper conducts a systematic study of this new film drip irrigation tillage pattern. Through the comparative analysis of the six experiments A-F, this paper investigates the impact of different farming modes on the content of SOC, HA, FA and Hu in soil. Meanwhile, by studying the content of different organic matters in topsoil surface and profile(0-60cm), this research comes to the following conclusions:(1) The analysis of the content of organic carbon in topsoil under different tillage patterns shows that the content of organic carbon, humic acid organic carbon, fulvic acid organic carbon, and humin organic carbon in the light group decrease significantly as the sampling depth increases significantly, especially in the 0-20 cm range. Organic fertilization and drip irrigation technology can accelerate the transformation of organic matters in soil, increase their contents and improve the soil fertility.(2) The analysis of the total content of organic carbon, active organic carbon and microbial biomass carbon in topsoil under different tillage systems shows that the total organic carbon content in soil varies significantly under different processing conditions. Especially, the total carbon content in E and F treatment groups is significantly higher than other groups. From the dynamic distribution of microbial biomass carbon, we find that the microbial biomass carbon in the soil of different treatment groups first increases, then drops, and finally rises again. The microbial biomass carbon content in F treatment group is significantly higher than other groups.It shows that the total content of organic carbon, activated carbon and microbial biomass carbon in the soil changes as the farming fertilizer changes. The reason may be that plastic film mulching facilitates the reproduction of microorganism, which increases microbial activity, water content and humus in soil. The technology of combining drip irrigation and organic fertilization can not only improve the soil microbial activity, but also accelerate the corrosion solution of organic fertilizer in soil and improve soil fertility.(3) The analysis of aggregate organic carbon in topsoil under different cultivation modes shows that drip irrigation combined with organic fertilization can enhance water stability and mechanical stability of soil aggregate and the content of organic carbon. With the decrease of the particle size, organic carbon and carbon content show an obvious first-downward-and-then-upward trend. After different organic fertilizations, the mechanical stability and water stability of different particle sizes of soil aggregates and the content of organic carbon increases. Soil particles greater than0.25 mm are superior soil particles. As for soil particles greater than 0.25 mm, drip irrigation treatment and processing of plastic film mulching reduce the content of soil aggregates while organic fertilization processing increases the content of soil aggregates.(4) The analysis of different soil combined humus reveals that the film drip irrigation and organic fertilization are conducive to the formation of loose soil combined humus.Fertility treatment can promote the formation of humus soil coupling. Film drip irrigation and organic fertilization are not conducive to increasing the content of stably-combined humus. After film drip irrigation and organic fertilization treatment,the content of microbial biomass carbon in soil increases significantly, which boosts the soil microbial activity and the content of organic matters in soil.(5) The analysis of soil humus morphological characteristics under different modes of organic fertilization shows that the content of C, H, O, N elements of HA and FA in soil humus composition in the E and F groups are the highest, followed by group B.After film mulching(C) and drip irrigation with plastic(D), the content of each element in the two groups is higher than the treatment group A. It indicates that different organic fertilizer modes can improve the element content in the soil. The structures of HA and FA in soil in different organic fertilization modes are similar.However, after organic fertilization, the content of polysaccharide, carbohydrates, and inorganic elements in soil increase.