Effect of straw addition on soil infiltration characteristics and model-fitting analysis
- PDF / 740,275 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 27 Downloads / 142 Views
ORIGINAL PAPER
Effect of straw addition on soil infiltration characteristics and model-fitting analysis Xiaoyu Wang 1
&
Kan Yang 1 & Jian Zheng 2
Received: 27 March 2018 / Accepted: 16 May 2019 / Published online: 19 June 2019 # Saudi Society for Geosciences 2019
Abstract This study explored the influence of straw addition on the soil water characteristic curves and the soil water holding capacity. Using two different soil bulk densities, soil infiltration was investigated using differently treated straw, i.e., comminuted ammoniated, and blended with inorganic soil conditioner. The experimental results showed that the addition of long straw significantly obstructed soil infiltration. Compared with the control experiment and the comminuted straw treatment, both the addition of ammoniated comminuted straw and the inorganic soil conditioner (Fe (OH)3) effectively improved the soil stable infiltration rate and the cumulative infiltration. After 30 days of culturing, the ammoniated straw treatment affected a more remarkable improvement of the soil structure by reducing the soil bulk density and increasing the soil porosity than did the inorganic soil conditioner treatment. Using a straw and inorganic soil conditioner in combination did not result in a positive interaction for soil improvement. The relative ranking of each treatment on soil infiltration performance was the same for both soil bulk densities. For the soil water characteristic curve of each treatment, both the Philip infiltration model and the van Genuchten (VG) fitting model using RETC software had excellent fitting accuracy. The excellent soil water holding capacity arising from the use of ammoniated comminuted straw at low suction pressures is of significance for soil water preservation in the dry season of the humid region of southern China. Keywords Straw addition . Comminution . Ammonification . Inorganic soil conditioner . Soil infiltration . Model fitting
Introduction Straw burning is one of the main causes of air pollution. In recent years, the Chinese government and relevant research departments have carried out a great deal of research and control of this pollution source, for example, by its addition to soil. The addition of organic matter and soil conditioner to improve soil structure can optimize soil water retention characteristics, and thereby increase the effective soil water storage capacity (Arnold et al. 2015; Das 1985; Ohu et al. 1987; Gupta and Larson 1979). Due to the current low technical Editorial handling: O. Kisi * Xiaoyu Wang [email protected] 1
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, People’s Republic of China
2
College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
level to which straw is processed, problems of slow decomposition, susceptibility to pests and diseases, and competition with crops for nitrogen sources exist (Van Groenigen et al. 2013). Many studies have demonstrated that the addition of straw to soil has
Data Loading...
