Papers by Author: Li Rong Wang

Abstract: Wheat straws, wheat shells, corn leaves and corn cobs (0%, 5%, 8% and 10%) were added to red clay to obtain seedling bricks, pure red clay as control (CK), did evaporation test. The results showed that the larger of the proportion of mix-plant was, the smaller the cumulative evaporation of seedling bricks was. The cumulative evaporation of seedling bricks mixed with 10% corn cob was the minimum. In all seedling bricks, the order of 1st day evaporation suppression efficiency and cumulative evaporation suppression efficiency I_E: mixed with corn cobs > mixed with wheat shells > mixed with wheat straws > mixed with corn leaves > mixed with nothing, and evaporation suppression efficiency of seedling bricks mixed with 10% corn cobs was the maximum. With the proportion of mix-plant increases, evaporation stability, evaporation suppression efficiency and water retention characteristic of seedling bricks were improved significantly.

Abstract: Wheat straws, wheat shells, corn leaves and corn cobs (5%, 8% and 10%) were added to red clay to obtain seedling bricks, and seedling bricks mixed with nothing as control (CK), and did the tests of molding density, crumble rate and penetration rate of water with them. The results showed that the larger proportion of mix-plants, the better on physical properties of the seedling bricks. When the proportion of mix-plants was the same, their molding density CK > mixed with wheat straws > mixed with corn cobs > mixed with wheat shells > mixed with corn leaves; their crumble rates: CK > mixed with corn cobs > mixed with wheat shells > mixed with wheat straws > mixed with corn leaves; their water penetration rates: mixed with corn cobs > mixed with wheat straws > seedling bricks mixed with corn leaves> mixed with wheat shells > CK. The density of seeding brick containing 10% corn leaves obtained minimum, and its penetration rate was the least as well; the penetration rate of water of seeding brick with 10% corn cobs was the biggest.

Abstract: SWAT (Soil and Water Assessment Tool) model is one of distributed hydrological model, based on spatial data offered by GIS and RS. This article mainly introduces the SWAT model principle, structure, and it is the application of stream flow simulation in China and other countries, then points out the deficiency existing in the process of model research. In order to service in water resources management work better, experts and scholars further research the rate constant and uncertainty of the simplification of the model parameters, and the combination of RS and GIS to use, and hydrological scale problems.

Abstract: Gravel-mulched field is a unique mode of conservation tillage created by the working people with gravel as cover material and dependent on natural rainfall. However, with the growth of the planting years of the gravel-mulched field, the ecological effects gradually reduce. Thus, on the basis of the analysis to summarize the type and the thickness of gravel-mulched field, the insulation effect of gravel-mulched field to farmland, the water retention properties, the suppressing salinity function, anti-wind and water erosion capacity and increase production and income etc., we must attach importance to increase the replenishment fertilization to gravel-mulched field, improve the planting patterns of gravel-mulched field, select new varieties of drought-resistant crops, establish modern water-saving supporting system of the gravel-mulched field and other management measures and recommendations of ecosystem to provide a theoretical basis for sustainable development of gravel-mulched field agriculture.