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2 Polish Journal of Ecology

2 2007

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The effects of Viscum album L. on foliar weight and nutrients content of host trees in Caspian forests (Iran)

Hosseini S.

Polish Journal of Ecology

2007

Vol. 55, nr 3

579-583

Caspian forests (in the region it is called . Hyrcanian Forests) with an area of about 1.9 million ha are located in north of Iran, in southern coast of Caspian Sea. It is exclusive site for some valuable species like Populus caspica Bornm., Gleditsia caspica Desf., Parrotia persica Meyer. and Pterocaria fraxinifolia (Lam.) Spach., and the forests are dominated by Fagus orientalis Lipsky, Quercus castanifolia C. A. M., and Alnus glutinosa Gaertn. The mistletoe (Viscum album L.) effects on the area and weight of leaves of the two host tree species (hornbeam Carpinus betulus L. and ironwood Parrotia persica Meyer.) were studied on a number of severely infected individuals and control trees in selected parts of Hyrcanian Forests. Almost 100 leaves from infested and non-infested branches of two host species were sampled in order to compare with control trees (non-infested trees growing near each host). Results showed, that area and weight of leaves taken from infested branches of ironwood were significantly lower (at 95% confidence level) than leaf area and weight in non-infested branches and control trees. The amount of K, Mn and Zn was higher in infested branches of both species compared to control trees. However, the amount of nitrogen in infected branches of ironwood was lower. The results suggest that V. album may have detrimental effect on leaf structure, physiology and chemical composition of strongly infested host trees.

Foliar stable carbon isotope discrimination and nutrients contents in two desert plant species

Zhao Liangju, Xiao Honglang, Liu Xiaohong, Li Jingxiu, Xiao Shengchun

Polish Journal of Ecology

2007

Vol. 55, nr 1

57-66

Variation of foliar stable Carbon Isotope Discrimination (CID [Delta] [per mil]) and nutrient contents of Artemisia ordosica (Krasch) (semi-shrub species) and Caragana korshinskii (Kom.) (shrub species) were studied at the south-eastern margin of the Tengger Desert, China. Foliar CID [Delta], total phosphorus content (TP) and potassium content (K) in A. ordosica were markedly higher than in C. korshinskii while foliar total nitrogen content (TN) and water-use efficiency (WUE) (calculated from foliar CID[Delta]) in C. korshinskii were significantly higher than those in A. ordosica. There were significant and positive relationships between foliar CID [Delta], TN and TP contents (P <0.001) in C. korshinskii, while in A. ordosica a strong and significant positive correlation existed between CID [Delta] and K content (P <0.001). Based on WUE, TN, TP, and K contents, as well as their relationships, we may conclude that in arid environments, the survival of C. korshinskii profits from itshigher WUE, while the survival of A. ordosica from its higher TP and K contents in leaves. In addition, the correlations of foliar CID [Delta] values with TN and TP contents in C. korshinski and with K content in A. ordosica revealed that the water was one of the main factors limiting the absorption capacity for N and P in C. korshinskii, and for K in A. ordosica. While nutrient conditions were not the factors affecting the growth of C. korshinskii and A. ordosica in the study areas.