Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Changes in foliar nutrient content and resorption in Fraxinus . | 641 Ann. For. Sci. 56 1999 641-650 Inra Elsevier Paris Original article Changes in foliar nutrient content and resorption in Fraxinus excelsior L. Ulmus minor Mill and Clematis vỉtalba L. after prevention of floods Michèle Trémolièresa Annik Schnitzlerb Jose-Miguel Sánchez-Pérezc Diane Schmitt3 Laboratoire de botanique et d ecologie végétale CEREG CNRS ULP Institut de botanique 28 rue Goethe 67083 Strasbourg France bLaboratoire de phytoécologie Université de Metz lie du Saulcy 57045 Metz France c Centre d etudes et de recherches éco-géographiques CEREG CNRS ULP 3 rue de rArgonne 67083 Strasbourg France Received 24 December 1998 accepted 11 March 1999 Abstract - This paper focuses on the impact of flood on tree mineral nutrition through measurement of resorption i.e. transfer of nutrients from leaves to perennial organs . Nutrient N p K Mg Ca concentrations in leaves of three representative species Fraxinus excelsior L. Ulmus minor Mill and Clematis vitalba L. were measured before and after abscission on flooded and unflooded hardwood forests of the upper Rhine plain. The nutrient concentrations in the soils which were measured in the top layer of the study sites were higher in the flooded sites for p but slightly lower for N and K and identical at both types of site for Ca and Mg. The summer foliage concentrations were higher for N and p in the flooded areas and probably related to the flooding process which contributes to regular nutrient inputs in the flooded forest causes high fluctuations of water level and increases bioavailability of certain nutrients. Resorption occurred for all nutrients in the three species and was higher for N p and K 40-70 than for Ca and Mg 0 15 but not significantly different at the two sites. This paper stresses the variability of the test species response nutrient content and resorption to the soil and flood water nutrient sources and tries to specify parameters which control resorption i.e. soil fertility tree species or flood .
