Download Forest Development: Succession, Environmental Stress and by C. Leuschner (auth.), Professor Dr. Achim Dohrenbusch, Dr. PDF

By C. Leuschner (auth.), Professor Dr. Achim Dohrenbusch, Dr. Norbert Bartsch (eds.)

Forest ecosystems are characterised through a gentle swap of their constitution of functionality. normal advancements are increasingly more noticeably disturbed via human impression. pollution ends up in soil acidification, swap in nutrient funds and to a lowering power of the timber. woodland administration can hinder ordinary succession and sometimes ends up in much less reliable forests. during this booklet, chosen result of 10 years of interdisciplinary environment examine are awarded. not just development and physiological reactions on environmental pressure, but in addition typical succession techniques are defined and analysed. along with the outline of wooded area improvement methods, in line with longterm experiments and statement, conclusions for useful woodland administration are given.

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6 (0. 5 (0. 13)2 The seasonal dynamics of soil moisture in the three communities are characterised by a moisture recharge period in September and October, winter maxima of water content in January and February, and a decrease of moisture starting as early as in March or April (Fig. I-II). Soil moisture minima may reach evalues < 2 vol. % in the sandy material during extended drought periods in summer. The recharge of the soil moisture reserves was less complete in winter 1990/1991 than in 1991/1992 (Fig.

In all three communities, this situation occurred during the winter months only. Between May and October, in contrast, the direction of the matric potential gradient reversed in all three communities with highest potentials occurring in the subsoil below the rooting horizon at 130 to 170 cm depth, and lowest potentials being found in the upper profile (Figs. 1-18 to 1-23). Thus, a local water flow divide existed in the subsoil of the profiles with gravitational downward flux prevailing in the lower profile (beyond 130 or 170 cm) and upward water movement occurring along the negative potential gradient above the divide.

R-r-T-rl 1 Jul 1 Oct 1 Jan 1 Apr 1 JuJ 1 Oct 1 Jan 1 Apr 1 Jul 1 Oct 1 Jan 1990 I 1991 I 1992 I Fig. 1-11. Seasonal course of volumetric water contents at three soil depths in profiles under heathland (site CHI), birch-pine forest (BP3) and oak-beech forest (OB5) during 1990 to 1992 (3-5 replicate samples analysed by gravimetry). 26 C. Leuschner Table 1-6. Mean volumetric water content (in %) of three mineral soil horizons in profiles under heathland (site CHI), birch-pine forest (BP3) and oak-beech forest (OB5) in the periods 1 January-31 December, 1991 or 1992, and 15 May-20 September, 1991 or 1992 (n = 35 gravimetric samples, coefficients of variation (v = STD/mean) in parentheses).

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