Effect of Nitrogen Input on Growth and Photosynthetic Physiology of Three Desert Species Seedlings

An impact of nitrogen input on growth and photosynthetic physiology of plant species seedlings was analyzed with three desert species,Alhagi sparsifolia,Zygophyllum fabago and Plantago maritime,as examples.The median-and high-concentration input could promote the increase of biomass of these three desert species seedlings.With increase of nitrogen input,the root growth of A.sparsifolia increased,but that of Z.fabago and P.maritime did not.The shoot/root ratio of these three desert species all increased with the increase of nitrogen input,and it suggested that the nitrogen deposition could increase the productivity of plant,especially the aboveground part.With increase of nitrogen input,the net photosynthetic rate,contents of chlorophyll and soluble protein and soluble sugar of these three desert species also increased,but the water use efficiency of A.sparsifolia and P.maritima decreased and that of Z.fabago increased.