| The problem of farmland soil degradation is a major problem facing the whole world.Conservation tillage technology can improve the physical and chemical properties of soil and reduce wind erosion in farmland.In order to study the impact of conservation tillage technology on the physical and chemical properties of farmland in Jieba mountainou area in northern hebei province.Xiaobazi Township of Fengning County is the main research site.Based on field experiments,the soil physical properties and soil chemical properties under different tillage measures before the wind season(October 2017)and after the wind season(April 2018)were analyzed.Physicochemical properties to assess the impact of conservation tillage measures on wind erosion in farmland.The main results are as follows:(1)Through the study of the physical properties of the soil,it is found that the 10cm coverage of the spring tumbling and the spring returning to the field can improve the physical properties of the soil,which can reduce the soil wind erosion of the farmland to a certain extent.Compared with the pre-season season,the autumn turning measures can appropriately reduce the soil bulk density compared with the spring turning measures,while the spring turning measures can reduce the soil water loss by about 25%compared with the autumn turning measures.The mechanical composition of the soil is equivalent to the content of powder and sand.The two particle sizes are about 95%.After the wind season,the spring clay is covered with 10cm,the spring is turned back to the field,the spring is covered vertically,and the soil is covered by the crossover.The content of powder and powder increased more obviously than before the wind season,with the highest increase of more than 10%.After the wind season,only the soil thickness distribution under the 10cm cover and spring turn-over field measures is positive skewness;the soil particle size peak under the spring cover and 10cm cover,spring turn-over field and spring turn vertical cover measures The fractal dimension is smaller than that before the wind season,and the fractal dimension under the measures of 10cm coverage of spring and returning to the field and spring is more than that before the wind season.(2)Spring tumbling and 10cm coverage measures can improve the soil chemical properties of farmland.Compared with the pre-season season,the increase of soil organic carbon content under the vertical cover,autumn turn over cover and spring turn over 15cm cover after the wind season is higher than 50%;soil alkaline hydrolysis under different measures before and after the wind season The difference in nitrogen content was large,but the overall trend was the same.The soil alkali nitrogen content under the spring season after the wind season and the 10cm coverage of spring tumbling were significantly increased compared with other measures;soil quick-acting after the wind season The phosphorus content was significantly higher than that before the wind season,and the increase of the maximum spring tumbling over 10cm coverage ratio was the highest increase of 128.39%,and the variation of soil available potassium content under different measures before and after the wind season was larger.Compared with the wind-season potassium content,the spring tumbling over 10cm coverage,the autumn tumbling vertical coverage and the spring tumbling cross-covering measures are 61.73%higher than the least-increased spring ploughing measures(3.01%),respectively.44.36%and 35.28%.Comprehensive evaluation of the physical and chemical properties of the various conservation tillage measures,the most suitable protective tillage measures for the farmland in in Jieba mountainou area in northern Hebei province is the 10cm coverage measures. |
