A Comparative Study Of Forage Legumes And Grasses Root Characteristics And Physiological Indexes

We compared root morphology of leguminosae grasses plants of Medicago sativa L. Medicago falcata L., and forage grasses of Agropyron cristatum, Bromus inermis Leysss by planting these four common species of grasses at the grassland ecological experimental base of Xilinhot City of Mao Deng ranch (University of Inner Mongolia Grassland Ecology research base) and monitoring the development of root systems using the CI-600root imager. At the same time to study of four grasses moisture utilization, net photosynthetic rate, tomatal conductance of photosynthetic parameters, and nutritional quality indicators crude protein, crude fat, crude fiber were determined. Analysis of the relationship of the different grasses root morphology and biomass, plant height, photosynthetic parameters, For artificial grass seed selection and planting to provide reliable basis in plant physiology. Preliminary draw the following conclusions:1. Medicago sativa L total dry weight is greater than Medicago falcata L., and Bromus inermis Leysss total dry weight is greater than Agropyron cristatum, and in various organs of grass, the largest proportion in the total weight is the stem, followed by leaf, seed minimum.2.Roots of four species were mainly distributed in the0-30cm soil layer, and more stable growth in the range of14-28cm soil layer. The root morphology Index is a positive correlation with plant height, aboveground biomass, net photosynthetic rate, transpiration rate, stomatal conductance, and negatively related to water use efficiency.3. Four kinds of grass’ diurnal changing curve of photosynthetic rate, transpiration rate and gas stomatal are "double peak" bender. The value of the first peak is greater than the value of the second one. Four kinds of grass’ seasonal variation curve of photosynthetic rate and transpiration rate are "single" bender. The peak value is from the end of June to the beginning of August. Four kinds of grass’ seasonal variation curve of water use efficiency are "single" bender. Photosynthetic rate and transpiration rate is both negatively related to water use efficiency.4. Legume grasses the Medicago falcata L. leaf ratio is greater than Medicago sativa L., forage grasses the Agropyron cristatum leaf ratio greater than Bromus inermis Leysss, the leaf ratio of four grasses negatively related to crude protein, crude fat, and is a positive correlation with crude fiber.5. Four grasses crude fat, crude protein content in leaves is greater than the stem, and the crude fiber content of stems than leaves; Crude protein in the leguminous grasses is higher than legume grasses, however, crude fat and crude fiber in legume grasses is higher than eguminous grasses; leguminous grasses nutritive value is higher than legume grasses.