earticle

영어

Soil erosion is one of the most widespread ecological problems with the most serious damage worldwide. In the present study, the influence of soil erosion thickness on soybean yield of black soil in Northeast China is studied. With the pot experiment as the method, this study investigates the influence by peeling the surface black soil layer at 0, 5, 10, 20, 25, and 30 cm to simulate different soil erosion thicknesses, establishes a quantitative model of soybean yield to explore the response of soybean yield to soil erosion thickness. The 4-D-optimum orthogonal design (416-A) is adopted to conduct the coupling experiment of water and fertilizers under erosion thicknesses of 0 and 15 cm so that the coupling modes of water and fertilizers under the two soil erosion thicknesses are established. The results show that soil erosion thickness has a significant influence on soybean growth, that is, with the increase in the soil erosion thickness, soybean plant height, pods and grains per plant all reduce, and soybean yield decreases in a Z-shaped curve, while yield reduction rate increases in a S-shaped curve, respectively. Water, along with N, P, and K fertilizers, affect soybean yield, but the intensity varies with soil erosion thickness. Under the soil erosion thickness of 0 cm, the order is: W>P>N>K. While under the soil erosion thickness of 15 cm, the order is: N>W>P>K. With the increase in soil erosion thickness and the decrease in soil fertility, the effect of irrigation reduces, whereas that of fertilization increases. The research results can provide the theoretical basis for soil erosion prevention and control in the black soil region.