tailieunhanh - LANDSCAPE ECOLOGY in AGROECOSYSTEMS MANAGEMENT - CHAPTER 14

Các đơn vị đất đai và đa dạng sinh học của đảo rừng: Hình ảnh vệ tinh Phân tích đất Cảnh quan của vùng nông thôn rộng rãi nuôi ở Ba Lan, như ở Pháp, được thực hiện một bức tranh về các mảnh đất nông nghiệp liên kết với không liền kề các khu vực rừng của các kích cỡ và hình dạng khác nhau, | CHAPTER 14 Land Units and the Biodiversity of Forest Islets From Satellite Images to Ground Analysis Marc Galochet Vincent Godard and Micheline Hotyat CONTENTS Introduction Land Units and the Biodiversity of Forest Islets Defining Land Units Forest Islets From Land Units to Vegetal Diversity Wooded Areas Shaped by Man Remote Sensing to Delimit Land Units and Establish the Location of Forest Islets Remote Sensing to Determine the Forest Islets The Choice of Samples in the Land Units From Medium to Large Scale How Can the Biodiversity of the Forest Islets Be Established on the Ground The Choice of Sampling Unit The Transect Orientation of the Transects Transect Number Distribution of the Transects Conclusion References 2002 by CRC Press LLC INTRODUCTION The landscape of extensively farmed countryside in Poland as in France is made up of a mosaic of agricultural plots linked to noncontiguous wooded areas of various sizes and shapes sometimes connected to one another by hedges or wooded corridors. These wooded areas have been and still are greatly influenced by man and his methods of cultivation. The biodiversity of forest islets thus depends as much on human actions as on the environmental conditions. What is the influence of forest management methods and forestry traditions on the biodiversity of forest islets What kind of diversity in terms of structure and function characterizes forest islets that have found a niche in ecosystems dominated by intensive farming To illustrate our remarks we use a sector in Greater Poland representative of extensively farmed countryside and situated approximately 50 km to the south of Poznan. First the land units are delimited with the help of satellite data. Second an automatic extraction process pinpoints the forest islets. Finally the biodiversity of these forest islets is analyzed using a frame sample. LAND UNITS AND THE BIODIVERSITY OF FOREST ISLETS Research on land cover units allows us to look at the forest islets in context .