1 IntroductionChina is one of the largest countries in agricultural production and consumption in the *** developmental situation of China's agriculture is one of the decisive factors in sustainingthe world food s...
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1 IntroductionChina is one of the largest countries in agricultural production and consumption in the *** developmental situation of China's agriculture is one of the decisive factors in sustainingthe world food security. Practice proved that developing fine varieties is the most economicaland effective measures in many important factors that can promote the production inagriculture. Germplasm enhencement and crop improvement have been effectively speed upthrough the adoption of high and new technologies. Genetic manipulation technology with theuse of mutation techniques has been used as one of the most efficient new means in China'scrop breeding. Bring the unique effects of this technology on crop breeding into full play is ofgreat significance to the development of agriculture in China, especially to the developmentof food production at full speed.
Rare Earth Elements(REE) tracer method was used to study sheet erosion changing to rill erosion onslope land. By placing different rare earth elements of different soil depth across a slope in an indoor plot, twosimul...
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Rare Earth Elements(REE) tracer method was used to study sheet erosion changing to rill erosion onslope land. By placing different rare earth elements of different soil depth across a slope in an indoor plot, twosimulated rainfalls were applied to study the change of erosion type and the rill erosion process. The resultsindicate that the main erosion type is sheet erosion at the beginning of the rainfalls, and serious erosion happensafter rill erosion appears. Accumulated sheet and rill erosion amounts increase with the rainfalls time. Thepercentage of sheet erosion amount decreases and rill erosion percentage increases with time. At the end of therainfalls, the total rill erosion amounts are 4 - 5 times more than sheet erosion. In this paper, a new REE tracermethod was used to quantitatively distinguish sheet and rill erosion amounts. The new REE tracer method shouldbe useful to future studying of erosion processes on slope lands.
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