Study on Primary Factors Influencing Soil Wind Erosion of Farmland and Conservation Farming System in the Agro-pastoral Ecotone
|School||China Agricultural University|
|Course||Crop Cultivation and Farming System|
|Keywords||Northern ecotone Wind erosion Protective Farming System|
Soil erosion has become an important factor to affect the northern ecotone region's economic development and the local and surrounding areas of ecological security. Northern farming Ecotone middle - Inner Mongolia Yinshan Mountain area, for example, using a combination of field trials and field pointing test, a summary of the historical data analysis, the household survey, the typical case studies based on the research. System to study the mechanism of the agricultural land Soil Erosion impact factor of dynamic change and its impacts, typical dryland farming systems sand control ability preliminary summarized the key technologies suitable for northern ecotone actual situation of agriculture and animal husbandry and model for sustainable development. The thesis content with the preliminary results are summarized as follows: ◆ wind erosion of natural influencing factors studies have shown that dynamic changes, the study area has potential natural conditions of wind erosion. Spring wind winds, less rainfall, climate erosivity low vegetation coverage, soil surface become loose due to freezing and thawing, the season of year are most vulnerable to wind erosion. ◆ wind tunnel test results show that the greater the wind speed, wind erosion is more intense between the performance of the power function relationship, 18m / s wind speed by the light becomes a turning point. ◆ soil wind erosion response system. From the soil texture, soil texture of the study area is slipshod, mainly sand content (> 50%), clay is low (<10%) or even zero, vulnerable to erosion. The wind tunnel test results show that the wind erosion rate showed a decreasing trend with increasing soil moisture, both logarithmic function relationship, 6% soil moisture level of the soil erosion to varying light a turning point ◆ different type of agricultural land by heavy wind erosion different dynamic changes affecting factor. (A) hilly open woodland, shrub land and labor Abandoned most coarse texture, the farmland shelterbelts soil surface content of fine particles highest slipshod than natural grassland, farmland texture. (B) the water content of the soil surface changes over time fluctuations of the peak-to-valley and white \Overall changes in the surface water content the farmland shelterbelt> natural grassland> Dryland potato> hilly woodland> Caragana microphylla shrubland. Surface soil moisture in winter and spring are lower, in the role of the gale, the most prone to wind erosion. (C) there are significant differences in the firmness of the surface soils under different land uses in hilly woodland, natural grassland> shrubland> land for farmland shelterbelts dryland potato. (D) the extent of vegetation cover the ground under different land use types are very different; shrub land, hilly woodland and natural grassland vegetation throughout the year covered by the ground, the coverage month dynamic on the size of the overall performance of shrubland> natural grassland hilly woodland. Compared with grass, shrubs and forest, the shortest time of farmland covering the ground, covered for seasonal and ground completely bare in the winter and spring (11 to next April), the coverage is zero, prone to wind erosion and desertification hazards. ◆ the main socio-economic factors to human activities have an important role in driving wind erosion intensifies. The rapid population growth has led to increasing pressure on environmental resources, and further lead to the destruction of vegetation, promote the occurrence of wind erosion. The grass area is declining, the number of livestock increased, the pressure will inevitably increase grass. Cause the pasture serious degradation desertification Improper application of the unreasonable structure of land use and farming technology is also important driving factors of soil erosion by wind. ◆ Protective Farming System configuration of key technologies, vegetation construction shrub and grass-based, farm crops configuration on close planting crops and thin planting crops should be implemented reasonable intercropping and intercropping, of tillage crops with stubble crops intercropping sets for improving the surface the overall extent of coverage. Retained stubble after harvest, the implementation of conservation tillage and strip cropping planting techniques. ◆ combat wind erosion, desertification, while achieving regional economic development, the increase of the income of peasants and herdsmen, the core content of the sand control type protective farming system. The sand prevention protective farming system development model should take into account the ecological and economic benefits.