Study Of Several Major Legumes On Adaptability And Diversity Resistance In Songnen Plans

Legumes are the most important part in ecology system of grassland and the major protein source of the forage for the livestock. Legumes can improve the soil quality by changing the physical and chemic characters of the soil. Most of the areas are the salt and alkaline soil in north China. On the base of former study we studied the following aspects 1) seedling stage investigation 2) phenophase investigation 3) yield capacity and morphological characters 4) adversity resistance of seeds 5) improving the chemic character of the soil. There was no document about studying on all major legumes together in Songnen plains. Thus this research aimed 1) to study and selected the most suitable species from several legumes in Songnen plains 2) to improve and protect the grassland,and provided the scientific theory.Comparisons were performed among several legumes. Investigation and study were performed in 2004 and 2005. By contrast lespedeza bicolor Turcz and Melilotus officinalis Desr could resist the insect pest more than other legumes. Phenophase investigation showed that Lathyrus quinquenervius was relatively earlier, Melilotus officinalis Desr was in the next place and lespedeza bicolor Turcz were latest. Medicago statival. L, Lespedza dahurica, Vicia multicaulis. L, Astragalus adsurgens had the highest yield. Medicago statival. L had the highest yield when sheared at different high. Lathyrus quinquenervius could not grow when sheared at 4cm high from the ground. Thus Medicago statival L was the best in yield. Smaller seeds behaved higher salt resistance. On the contrary, bigger seeds behaved lower salt resistance. Species, which seeds of them were smaller relatively, could improve the soil better.In conclusion, the legumes, which seeds of them were smaller relatively, were more adapt to plant in Songnen plains.