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Pinus Peuce Griseb.) in Bavaria Against the Backdrop of Climate Change

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Pinus Peuce Griseb.) in Bavaria Against the Backdrop of Climate Change FORESTRY IDEAS, 2015, vol. 21, No 2 (50): 173–187 GROWTH AND PERFORMANCE OF MACEDONIAN PINE (PINUS PEUCE GRISEB.) IN BAVARIA AGAINST THE BACKDROP OF CLIMATE CHANGE Martin Bachmann1, Daniela Rommel2, and Bernd Stimm3* 1Department for Food, Agriculture and Forestry, Ebersberg, Bahnhofstrasse 23, D-85560 Ebersberg, Germany. E-mail: [email protected] 2Bern University of Applied Sciences, School of Agricultural, Forest and Food Sciences HAFL, Länggasse 85, CH-3052 Zollikofen, Switzerland. E-mail: [email protected] 3Institute of Silviculture, Technische Universität München, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany. *E-mail: [email protected] Received: 24 September 2015 Accepted: 09 November 2015 Abstract One strategy for mitigating the effects of climate change on forests in an uncertain future is the allocation of risk across a portfolio of different tree species. Since the beginning of 2009, a project of the Bavarian State Institute of Forestry (LWF) has sought to identify warm- and drought- tolerant exotic tree species suited to conditions expected in Bavaria under climate change. As an outcome of this process, six potential non-native tree species were selected for the establishment of species trials in Germany (Bavaria and Thuringia), Austria and southern Switzerland. Parallel to the creation of young trial plantations, one species – Pinus peuce – was analyzed in detail in 67- to 105-year-old planted stands in Bavaria to obtain complementary information. This effort sought to quantify growth and performance of this species and compare these results with those of other tree species already grown successfully in Central European forests, e.g. Norway spruce, Scots pine, Еastern white pine, and Douglas fir. Measurements in four small planted stands in the Grafrath Experimental Forest showed mean DBHs from 26.8 to 43.8 cm and average heights from 24.1 to 28.4 m, with single tree volumes ranging from 0.7 to 1.8 m³. Due to drought condi- tions, particularly during a period of increased temperatures, the radial growth rate of P. peuce was considerably reduced in 1976 and 2003 and beyond, after which the species recovered only moderately. As a consequence of decreasing precipitation and more frequent late spring frosts, P. peuce exhibited strong negative reactions in annual ring growth. In general, these trees reacted positively to increasing mean annual temperature. Despite high volume production, the results revealed several uncertainties about the suitability of P. peuce for southern Bavaria under condi- tions of climate change. Based on the assumption of further decreases in precipitation in the near future, P. peuce can be expected to suffer increasingly from drought stress and to demonstrate decreased annual increment. Nevertheless, the species seems to be appropriate for afforestation in montane areas because of its proven resistance to wind throw and snow break. Key words: Pinus peuce, climate change, forest transformation, tree species selection, growth trials, Bavaria Introduction Decision making should be based on critical scientific analyses. Foresters worldwide are confronted with One of the first and most important the question of how to react properly to steps in silviculture is species selection for the implicit dynamics of climate change. afforestation and reforestation purposes. 174 M. Bachmann, D. Rommel, and B. Stimm This has far-reaching implications for sil- ity value analysis in which ecological and vicultural practice against the background socio-economic parameters were evalu- of the rapidly changing conditions for for- ated; and finally, a growth filter contain- estry. ing existing knowledge on tree growth of Growth and performance of forests is each selected species. Based on the out- influenced not only by the specific site re- come of this process, six potential non- quirements of tree species, but also by native tree species were chosen for the current and future climatic conditions. establishment of species trials in Bavaria According to the Intergovernmental Pan- (Schmiedinger et al. 2009) and later in el on Climate Change (IPCC) report of Austria, southern Switzerland and Thur- 2007 (IPCC 2007), forests worldwide will ingia. These species include Bornmüller be endangered because of water short- fir (Abies bornmülleriana Mattf.), West- ages, heavy precipitation events and in- ern hemlock (Tsuga heterophylla (Raf.) creased temperatures. In Europe, even Sarg.), Lebanon cedar (Cedrus libani well-established native tree species like A.Rich.), Oriental beech (Fagus orienta- Norway spruce, Scots pine and Europe- lis Lipsky), Silver linden (Tilia tomentosa an larch will be threatened by increases Moench) and Macedonian pine (Pinus in temperature and lack of precipitation, peuce Griseb.). which in turn can lead to enhanced sus- For quite a long time, Eastern white ceptibility to forest pests (Kölling and pine (Pinus strobus L.) was favored by Zimmermann 2007). the wood industry because of its potential One strategy for mitigating the ef- for rapid growth on nutrient-limited forest fects of climate change on forests in an sites in Central Europe. Unfortunately, the uncertain future is the allocation of risk species’ susceptibility to white pine blister across a portfolio of different tree spe- rust (Cronartium ribicola J.C.Fisch.) re- cies. Since the beginning of 2009, a sulted in the dieback of vast areas of white project of the Bavarian State Institute pine stands. As an alternative, Macedoni- of Forestry (LWF) has sought to identify an pine was planted in several locations in warm- and drought-tolerant exotic tree Germany (Alexandrov 1998). species suited to conditions expected During the planning period of the in Bavaria under climate change. The above described project, some old- selection of these species was done by er plantings of Pinus peuce (67- to applying three filters. The first filter was 105-year-old planted stands) were iden- created by obtaining a geographic infor- tified in Upper Bavaria and Upper Pa- mation system (GIS) layer containing cli- latinate and analyzed in detail to obtain mate data worldwide with focus on areas complementary information. This effort where the climatic conditions are similar sought to quantify previous growth and to those currently existing in Bavaria or performance of P. peuce in Germany and those expected under climate change. compare these results with those of other This layer was then overlaid with infor- tree species, e.g. Norway spruce, Scots mation on natural distributions of tree pine, Eastern white pine, and Douglas species occurring in these areas which fir. The focus of this analysis was the resulted in a set of potential tree species. quantification of individual tree and stand Two additional filters were then applied – growth of P. peuce under recent climatic a utility value filter created through a util- conditions on several Bavarian sites. Growth and Performance of Macedonian Pine... 175 Material and Methods and commercial thinning from these stands. In the period subsequent to Rhomeder’s in- vestigation – 1970 to 2011 – damages and self-thinning events in these stands were Study site locations also very limited. Experimental Forest Area Grafrath Bodenwöhr The Grafrath Experimental Forest com- A fifth mixed forest stand consisting of prises 34 ha and is located 40 km west 58 % Pinus peuce, 39 % Pinus sylvestris of Munich, Germany (latitude 48°11’67”N, L. and 3 % Picea abies (L.) Karst. is locat- longitude 11°16’67”E) at an elevation of ed near Bodenwöhr (BW), Germany which approximately 580 m a.s.l. The average lies about 160 km north of Munich (latitude temperature recorded at the site between 49°17’46”N, longitude 12°20’138”E). The 1961 and 2010 was 8.1° C∙year-1, and the elevation at this site is 378 m a.s.l., the av- -1 average precipitation between 1963 and erage temperature is 8.5° C∙year and the -1 1980 was 977 mm∙year-1. Soils range from average precipitation is 677 mm∙year . calcareous sandy-loamy gravel to gravel- The area is 0.13 ha in size, and the soils ly-sandy loams. are secondary podsols. There are four stands containing Pinus The most recent thinning measures – peuce at the site, some of which are grow- applied in 1997 – were focused mainly on ing in mixture with other species. Details Pinus strobus, and thus, only single speci- regarding the age and size of these four P. mens of P. peuce were harvested. The vi- peuce stands (from hereon referred to as tality of P. peuce at this site is good, and G1, G2, G3 and G4) are shown in Table here too, damages are very rare. 1 (along with information about one addi- tional stand – stand BW – at another loca- tion which is described below). Methods The Grafrath Experimental Forest was established in 1881 by Prof. Dr. Robert Initially, key parameters of forest growth Hartig for the purpose of conducting ex- (e.g. DBH and height growth as well as periments with exotic species which remain calculated growth indicators like basal active today (LWF Bayern 2015). In 1970, area, volume, and stocking of the stands) Rohmeder (1970) published the first reports were collected. Tree and crown heights regarding two of the Pinus peuce stands de- were measured with a Vertex IV instru- scribed above. However, even in this publi- ment and DBH was determined using a cation, no information is provided about the circumference tape. Height-diameter rela- origin and provenance of the seeds used to tions and a stand height curve were de- establish these stands. According to him, rived on the basis of measurements from these two stands were allowed to remain at least 30 individual trees in each stand. very dense, and thinning activities were Crown length was calculated from tree marginal and occurred relatively late. This and crown height to be used as an indica- accounts for the dense stocking which per- tor of vitality.
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