Research on Ecological Effect of Different Tillage Methods in Northern ShanXi, China
|School||Beijing Forestry University|
|Keywords||Conservation tillage Corn Soil moisture|
Currently, the serious wind erosion and dust storms plagued Beijing and Tianjin, and deteriorating. In the process of governance, it is recognized in the afforestation, the grassland construction at the same time should also be noted farmland protection. How to prevent both from the sand, and do not affect the income of farmers, but also to improve economic efficiency? Implementation of conservation agriculture is one of the effective way. In Datong City, Shanxi Hunyuan County in 2004 to test different types of land wind erosion field observations and laboratory analysis, and by measuring soil moisture, crop and meteorological data, the use of water balance of the forest, grass and farmland three Evapotranspiration of the kinds of land use patterns, compare their water use efficiency, economic and ecological benefits, draw the following preliminary conclusions: prevent wind erosion, Fruit Trees gt; alfalfa gt; no-tillage gt; tilling. The results showed that: has a good ecological effects of conservation tillage can effectively control wind erosion and desertification of farmland, reducing wind erosion. In Physiology, corn fixed light intensity test found that under low light intensity, the photosynthetic rate than the no-till plowing about 35% higher, cover plowing, minimum tillage than plowing a height of about 8% With the increase of light intensity, covered photosynthetic rate is rapidly increasing, the coverage has been maintained at the highest level, photosynthesis and transpiration are relatively strong. The soil surface temperature tillage than no-till high of 0.3 ° C at 5cm and 10cm high 0.4 ° C no-tillage plowing; 15cm and 20cm at the May 7, both equivalent to June, no-tillage plowing high 0.6 ° C. Drought of more than 1m, process water storage close to 1m, cover, increase in no-till soil water storage were higher than plowing 31.6%, 28.6%; rainy season 2m depth, coverage, no-till soil water storage minus a small amount of tillage 54.2%, 58.6%; stabilization period covering the soil water storage increased 5.4mm, and no-tillage reduced 1.2mm, 4.2mm plowing. From the final result, no-till production 19.3% higher than plowing, total water consumption in coverage and no-till than plowing less water 33.6 mm and 26.2mm water use efficiency, coverage and no-till than plowing increased by 2.8 % and 15%. Conservation tillage within 2 meters of soil moisture than alfalfa, woodland water 60 to 110%, soil moisture for planting alfalfa and woodland close to the plant use the lower limit, due to high rainfall variability on the Loess Plateau, to predict soil moisture dynamic help determine the agriculture, forestry, crop sequence in a complex ecosystem, reduce the risk of agricultural production, the maintenance of ecological safety significance.