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Application of the Global Indicators to Landscape Change Modeling on Prahova Valley (Romanian Carpathians and Subcarpathians)

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Application of the Global Indicators to Landscape Change Modeling on Prahova Valley (Romanian Carpathians and Subcarpathians) International Journal of the Physical Sciences Vol. 6(3), pp. 534-539, 4 February, 2011 Available online at http://www.academicjournals.org/IJPS DOI: 10.5897/IJPS10.421 ISSN 1992 - 1950 ©2011 Academic Journals Full Length Research Paper Application of the global indicators to landscape change modeling on Prahova Valley (Romanian Carpathians and Subcarpathians) Ileana P ătru-Stupariu 1*, Mihai-Sorin Stupariu 2, Roxana Cuculici 1 and Alina Huzui 1 1Faculty of Geography, University of Bucharest, Bd. N. Balcescu, 1, 010041 Bucharest, Romania. 2Faculty of Mathematics and Computer Science, University of Bucharest, Str. Academiei, 14, 010014 Bucharest, Romania. Accepted 27 January, 2011 Interdisciplinary approaches to landscape assessment are an extremely important component of environmental issues modelling and, consequently, of sustainable development. Thus, in recent years, specific indicators whose understanding and application requires a multidisciplinary background have been widely introduced and used. Examples of such indicators are landscape metrics, which reveal quantitative information concerning the structure, the features and the functionality of landscapes. The aim of the present study was to reveal the importance of global landscape metrics for monitoring the diversity, the fragmentation, the complexity and the homogeneity of a region. Based on 1970 maps and on 2009 satellite images, the values of seven global landscape metrics were computed for the mountainous and sub-mountainous region of the Prahova valley (Romania). The values highlighted the tendency of clustering and homogenization correlated with a decrease of shape complexity at landscape level. The information obtained can be useful both in landscape planning and habitat monitoring, as well as control of human intervention and anthropization. Key words: Landscape metrics, fragmentation, diversity, homogeneity, complexity. INTRODUCTION Landscape is an interdisciplinary global concept, (Council of Europe, 2000) have the role to direct and to approached and interpreted through various methods encourage local actors to appropriate the “principles specific to geographers, ecologists, biologists, architects, stipulated in the convention and proposes member states urban planners, landscape planners, agronomists, of the European council to acknowledge the landscape foresters, plastic artists and not least, by mathematicians and to integrate it in the territorial planning, cultural, and computer scientists. All this domains have mainly environmental, agricultural, social, economical politics” considered the spatial dimension of the landscape as well and other politics that can directly or indirectly influence as its functional and esthetical dimensions (Tudora, the landscape. In the considered convention context, 2009). Moreover, the latest legal regulations, particularly landscapes are “an essential component of people’s the European Landscape Convention, Florence 2000 surroundings, an expression of the diversity of their shared cultural and natural heritage, and a foundation of their identity ” (Council of Europe, 2000). The main question is how much the different research *Corresponding author. E-mail: [email protected]. areas intercede and which are the common methods that Tel: +40 749 272 173. can be used to create a bridge in order to answer to the Pătru-Stupariu et al. 535 environmental issues (using landscape as an indicator in composition (O’Neill et al., 1988). The second feature establishing the diagnostic, syntheresis and prognosis for analyzed is the “fragmentation”, since in landscape the environment). It was already pointed out (Savard et ecological investigation, much of the presumed al., 2000) that the study of landscape dynamics is an importance of spatial pattern is related to edge effects important step for understanding the changes occurred at (McGarigal et al., 2002). New landscapes derive from the the level of ecosystems, biogeochemical circuits and profound changes in land use and land cover. These biodiversity. Another important issue is to identify the changes can induce a higher degree of fragmentation, common methods which are relevant to territorial such that different species would be unable to identify the management and planning (landscape planning), or in limits of their original habitat. This landscape enhancing the regional competitive potential through fragmentation needs to draw the attention of local actors valorisation and capitalisation. and one has to investigate new habitat models. Another A possible answer in this direction is given by phenomenon that should be considered is related to the introducing and using specific indicators, such as frontier’s irregularity (complexity) between different landscape metrics (McGarigal and Marks, 1995; fundamental territorial units. The frontiers with highly Botequilha, 2001; McGarigal et al., 2002; Botequilha et complex/simple shapes can be directly related to the al., 2006; McGarigal et al., 2009). The role of landscape increase/decrease in the landscape biodiversity. The metrics is to highlight quantitative information regarding relationship between patch size and patch form may the landscape structure, characteristics and functionality. influence animal foraging strategies (Forman and Landscape metrics are an important tool in characterising Godron, 1986). Finally, landscape “homogeneity” landscape attributes, in landscape classification or in facilitates the delimitation and indication in the study area emphasizing landscape changes and perturbations of habitats that have not been degraded yet. As habitat (Antrop and Eetvelde, 2000). Moreover, such indicators fragmentation proceeds, habitat contagion decreases, can be successfully used in landscape planning habitat subdivision increases and eventually ecological (Botequilha and Ahern, 2002). The application of this function is impaired (Saunders et al., 1991). metrics extended concomitantly with the large scale use The global indexes are calculated for the entire of geographical information systems and of techniques landscape area, achieving a synthesis of the phenomena involving satellite images (Skupinski et al., 2009). This recorded at patch or class level. Our purpose is to subject benefits from a very diverse bibliography and a highlight the way in which indexes reflect the landscape brief historical presentation of the metrics’ use, diagnosis of an area. The diagnosis can provide useful accompanied by other references can be found in Farina information for the authorities competent to manage this (2007). data base applicable in landscape planning (Council of The case study presented in this paper intends to apply Europe, 2010). the mentioned landscape evaluation methods for Prahova valley, a highly touristic region, situated in the mountainous and sub-mountainous sector of the MATERIALS AND METHODS Romanian Carpathians. Such methods were already The study area applied in Romania, but for a hilly area (Schreiber et al., 2003), or for a limited sample of the Carpathians (P ătru- The study area (Figure 1), with a total surface of 146.12 km 2, Stupariu et al., 2009). Practically, we intend to compute includes entirely the sub-mountainous area of Prahova valley, as global indexes, in order to highlight a series of well as its northern limit, located at the contact with the mountainous sector of the valley. fundamental components in the landscape functionality: The Romanian scientist George Vâlsan, one of the first diversity, fragmentation, complexity and homogeneity. geographers who studied the Prahova valley (Vâlsan, 1939) Each of the four selected features has its own identified the source of this river in the town of Predeal, in Bra şov importance and relevance at the level of landscape unit. County. In subsequent studies (Velcea, 1965) several geological The landscape “diversity” derives from geo-diversity (the and morphological differentiations were noticed. Hence, in the mountainous region appear harder and older rocks (cretaceous geological, relief, soil, climatic conditions) and from the limestones, conglomerates), while in the sub-Carpathian sector anthropical component. In the study area, the two types prevail younger and weaker rocks (Miocene, Pliocene - diorite can be clearly delimited, because the human pressure sands, clays). The geodiversity of the area gives rise to different footprint has dissociated and influenced the landscape landforms (mountain ridges, hills, valley corridor) and hence to a structure and configuration over time. Moreover, the heterogeneous and complex landscape. diversity indexes were applied on a large scale in Due to the relation between the country`s capital, Bucharest, and the town of Bra şov, a prominent center in Transylvania, the landscape ecology, in order to quantify a fundamental Prahova valley underwent through the recent centuries a profound aspect of the binominal landscape structure-landscape landscape dynamic. It encompasses the most impressive 536 Int. J. Phys. Sci. Figure 1. Location of the study area and land cover maps for the years 1970 and 2009. humanization process of the country`s mountainous valleys; in less which already showed their utility in previous studies (for example, than fifty years gathering one of Europe`s most luxurious resorts. landscape metrics), in order to assess the landscape character and The upper sector of Prahova valley stands as a distinct functionality, respectively to make predictions concerning discontinuity between the Eastern and
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