6Papanastasis V P, Yiakoulaki M D, Decandia M, et al. Integrating woody species into livestock feeding in the Mediterranean areas of Europe[J]. Animal Feed Science and Technology, 2007, 3(12): 1-17.
8Agricultural Institure of China.Collections of Annual Meeting's Papers of First Youth Agricultural Sciences[M].Beijing:Science and Technology Press,1992:68-72.
9James C P,Miller G W.The effects of iron and light treatments on chloroplast composition ultra structure in iron-deficient Barley leaves[J].Journal of Plant Nutrition,1982,5(4/7):311-321.
10Yuan Daoxian,Li Bin,Liu Zaihua.Karst in China[J].Episodes,1995,18(1/2):62-65.