Internal and external nutrient transfers in foliage of some north deciduous trees Ⅰ Changes of nutrient concentrations and contents

Abstract

Abstract: Twelve north deciduous tree species are studied to characterize their changes of dry leaf weight, and concentrations and contents of ash, organic matter and 7 elements in leaves per area before and after leaf fallen.Different change patterns are detected among tree species and among elements.The decrease of dry weight and organic matter in fallen leaves is measured in all analyzed tree species, while the increase is found in ash concentrations of all speies and in its contents of most species (except Robinia pseudoacacia,Elaeagnus angustifolia and Juglans madshurica). The contents of N, Pand Kare decreased by about 1/3 to 2/3 during leaf fallen.Mg contents are decreased in species Elaeagnus angustifolia, Juglans mandshurica, Ulmus propingua, Quercus mongolica and Larix kaempferi, but increased in others. Fe content is higher in fallen leaves than in living leaves for all trees except Elaeagnus angustifolia. Ca and Si concentrations and their contents are markedly increased in all species.

Key words: Deciduous trees, Nutrient concentration, Nutrient content, Hylotelephium erythrostictum, carbohydrate metabolites, crassulacean acid metabolism plant (CAM plant), CO₂ concentration, photosynthesis

Xu Fuyu, Wang Lihua, Li Peizi, Xu Siming, Zhang Songyun . Internal and external nutrient transfers in foliage of some north deciduous trees Ⅰ Changes of nutrient concentrations and contents[J]. Chinese Journal of Applied Ecology, 1997, 8(1): 1-6.

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