Abstract:

In order to solve the problems of soil-fixation and erosion-resistance of terrace ridge, we did some research about planting and keep-alive technology of Hemerocallis fulva, the effects and economic benefits of soil-fixation and erosion-resistance. We finished the research by laboratorial determination of physiological index, planting root-protective seedlings, observation of runoff plots, and use Hemerocallis fulva as experimental material. The results showed that the critical saturation deficit of the Hemerocallis fulva was 66.73%. The leaf water loss rate was 98.43% at the 16th day, with strong drought resistance. The soil moisture in the terrace ridges was affected by the evaporation from the ridge sides. The soil water deficit value decreased with the increase of the distance away from the ridge side, but the soil nutrient content was higher near the ridge than in the middle of the terrace. The planting survival rate of the root-protected seedlings was much higher than that of the bare-root seedlings. Soil-fixed weight of the roots of the single eight-year-old Hemerocallis fulva was 69.2 kg, reaching the maximum. Compared with the control, planting Hemerocallis fulva on slope decreased the average annual soil erosion modulus (t/km2) and the annual fresh water runoff depth by 54.9% and 53.7%, respectively. Therefore, planting Hemerocallis fulva on slope had significant effects on soil fixation and antierosion. Hemerocallis fulva planted in terrace ridge will affect the yield of neighboring crops 2 meters around. But the gain from planting Hemerocallis fulva will be far greater than the loss caused by crop yield reduction.