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以沙打旺、紫花苜蓿、草木樨、扁穗冰草、蒙古冰草和披碱草6种牧草为研究对象,通过测定其生产性能和光合特征参数,研究其在宁夏盐池干旱风沙区的生产能力和光合能力。结果表明:豆科的干草产量显著高于禾本科,其中草木樨植株较高,分枝数多,叶面积指数及干草产量高,生产性能较强,其次是紫花苜蓿和沙打旺;禾本科披碱草的株高、密度和分蘖数显著大于扁穗冰草和蒙古冰草,生产性能一般,两种冰草的生产性能较差;豆科的净光合速率、蒸腾速率、胞间CO2浓度、气孔导度和相对叶绿素含量均显著大于禾本科,草木樨和紫花苜蓿光合能力较强;禾本科披碱草的水分利用效率显著高于豆科。相关分析表明,株高与分枝(分蘖)数、茎叶比、叶面积指数和干草产量呈极显著正相关,与密度、鲜干比分别呈极显著和显著负相关,茎叶比、叶面积指数与干草产量呈极显著正相关,净光合速率、蒸腾速率与胞间CO2浓度、气孔导度、叶绿素含量呈极显著正相关,气孔导度与胞间CO2浓度呈极显著正相关,与水分利用效率呈极显著负相关。
Six kinds of herbage, Astragalus adsurgens, alfalfa, grass mulberry, Agropyron chinense, Agropyron crassipes and Elymus sibiricus were selected as research object, and their production performance and photosynthetic parameters were studied to study their production in arid sandy area of Yanchi, Ningxia. Ability and photosynthetic ability. The results showed that the yield of leguminous hay was significantly higher than that of Poaceae. Among them, the plants with higher branching rate, branching number, leaf area index and hay yield, strong performance, followed by alfalfa and sandwangwang; The plant height, density and tiller number of Siberian cabbage were significantly larger than those of Elaeocarpus sylvestris and Mongolian spp. The performance of Siberian sward was poor. The net photosynthetic rate, transpiration rate, intercellular CO2 concentration, Stomatal conductance and relative chlorophyll content were significantly higher than that of Poaceae, and the photosynthetic capacity of M. fortunei and alfalfa was stronger than that of Leguminosae. The water use efficiency of Elymus grass was significantly higher than that of Leguminosae. Correlation analysis showed that the plant height was significantly and positively correlated with the number of branches (tillers), the ratio of stems and leaves, leaf area index and hay yield, and had a significant and significant negative correlation with density and fresh-dry ratio. There was a significant positive correlation between area index and hay yield. Net photosynthesis rate and transpiration rate had a significant positive correlation with intercellular CO2 concentration, stomatal conductance and chlorophyll content. There was a significant positive correlation between stomatal conductance and intercellular CO2 concentration. Water use efficiency was significantly negatively correlated.