TAILIEUCHUNG - Báo cáo lâm nghiệp: "The influence of acid mist upon transpiration, shoot water potential and pressure—volume curves of red spruce seedlings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: The influence of acid mist upon transpiration, shoot water potential and pressure—volume curves of red spruce seedlings. | 577s Ann. Sci. For. 1989 46 suppL 577s-580s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA The influence of acid mist upon transpiration shoot water potential and pressure-volume curves of red spruce seedlings D. Eamus I. Leith and D. Fowler Institute of Terrestrial Ecology Bush Estate Penicuik EH 26 OQB Scotland . Introduction Widespread forest decline has been documented in Europe and . Johnson 1987 Woodman 1987 . This decline increases with increasing altitude McLaughlin 1985 . One hypothesis to explain the decline and its altitude dependence is that excessive proton input has a deleterious effect upon tree growth. Acid input to the foliage and soil via wet and dry deposition may be a major factor in causing decline directly or indirectly by predisposing the tree to additional biotic and or abiotic stress factors. The maintenance of a favorable water status is a priority for continued growth and survival and many of the symptoms associated with forest decline crown thinning root necroses may be expected to influence plant water status. This paper presents some of the results of a detailed study of the influence of acid mist on the water relations of red spruce seedlings. Materials and Methods Red spruce seeds were germinated and grown for 16 mo in a greenhouse maintained at 16-20 C. On 16 7 87 100 seedlings were placed inside each of 8 open top chambers OTCs at a site in Scotland . 55 50 N 2 13 W 200 m altitude . Four different pH treatments pH and with simulated acid mist were supplied using dilutions of an equimolar solution of NH4 2SO4 and HNO3. Each chamber received twice weekly sprays with an equivalent of 2 mm precipitation per spray. Spraying commenced on 24 7 87 and continued until 20 12 87. The following measurements were made 1 shoot water potential was determined at 09 00 h on 23 10 87 using a portable Scholander pressure bomb Hellkvist et al. 1974 . Eight replicate branches from pH and treated

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