Proceedings of the Symposium on Global and Environmental Monitoring: Proceedings of the Symposium on Global and Environmental Monitoring

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Persistent identifier:: 856665355

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts ; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856665355

Language:: English

Document type:: Multivolume work

Volume

Persistent identifier:: 856669164

Title:: Proceedings of the Symposium on Global and Environmental Monitoring

Sub title:: techniques and impacts; September 17 - 21, 1990, Victoria Conference Centre, Victoria, British Columbia, Canada

Scope:: XIV, 912 Seiten

Year of publication:: 1990

Place of publication:: Victoria, BC

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 856669164

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: ZS 312(28,7,1)

Language:: English

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: [FA-3 FOREST DAMAGE]

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: FOREST TYPE CLASSIFICATION FOR DEGRADATION ASSESSMENT IN THE MENGYANG NATURE RESERVE, P. R. OF CHINA. Robert DE WULF, Roland GOOSSENS and France GERARD, Boudewijn DE ROOVER, John MACKINNON, Li ZHI XI

Document type:: Multivolume work

Structure type:: Chapter

2. STUDY AREA 2.1. Location Mengyang Nature Reserve (99733 ha) is located in the Xishuangbanna Dai autonomous prefecture in th south of Yunnan province in the South est of the People's Republic of China. The study area forms part of the Xishuangbanna Nature Reserve, a discontinuous series of forest blocks totalling S'.me 200.000 ha (Figure 1). Mengyang is shaped like a figure of 8 on its side with the central constriction being where a major road cuts through. There are numerous villages and clearings in this central sector. Its landforms vary from riverine val leys (about .49%), hills (6.71%), low mountains (.89%), medium mountains (51.33%) and high plateau (40.58%). Most of the land lies between 1100 - 1300 m a.s.l., but the highest hills reach over 1700 m. 2.2. Vegetation types According to the physical regions clas sification by Ren Mei'e (1985), the test area forms part of the Southern Yunnan Intermontane Basin. The variety in relief and soil types, the latter mostly of the red soil type, combined with its location in the subtropical region, yields an exceptional richness of vegetation types. Mountains and rivers mainly run in a north-south direction favouring the penetration of humid and warn air cur rents from the south. The region features no marked contrast in seasons, but there ai e notable differences in rainfall. The wet season lasts from the end of May till the end of October, and brings 9C% of the annual rainfall. A somewhat cooler spring period lasts from the beginning of november till the end of March, and a warm spring period lasts only six weeks between early April and the mid dle of May. Fog is very common in the dry season. The resulting high air moisture content allows true tropical vegetation species to survive at a higher latitude than expected. The vertical distribution of forest types in Xishuangbanna is rather clear: 1. Tropical seasonal rainforests below 800 m 2. Montane rainforest betweei, 800 m and 1000 m 3. Monsoon everqreen broadluaf between 1000 m and 1800 m 4. Mossy evergreen broadle if above 1800 m Owing to the complexity of geo morphology, soil distribution and the variation in bioclimate in Xishuangbanna, the numerous vegetation types may criss-cross each even duplicate in transition The vegetation of Mengyang forest forest other and belts. reserve is mostly sub-tropical evergreen broadleaf forest. The most important species belong to the Fagaceae, with Castanopsis sp., Lithocarpus sp. and Cyclobalanopsis sp. This forest type has a somewhat discontinuous canopy. The trees are lower than in the ever green rainforest, and the diameters are seldomly larger than 40 cm (Verbist 1990) . This forest type is mixed with bamboo in the western part of Mengyang. In the eastern part this forest type features open areas covered with grass, the weed Eupatorium sp. or scrub. Mengyang has small areas (1254 ha) of seasonal evergreen rain forest. The primary forest has an uneven, but closed canopy and, besides the upper layer, a secondary tree layer, a layer with small trees and shrubs, and the ground cover (Wang 1961). There is no dominance of single species. Important key species are: Terminalia bellirica, Barringtonia pendula and Antiaris toxicaria (Verbist 1990). There are extensive areas of bamboo forest (with Dendrocalamus sp.), especially in the western sector along the Lancang river. The occurrance of limestone hill monsoon forest, with key species Cleistanthus sumatranus and Celtis wightii, should also be mentioned. A long history of shifting cultivation has resulted in a patchiness of forest condition with many extensive cleared areas around the larger villages. These areas, which have lost their natural forest vegetation, are now classified as tall grasslands (with Imperata cylindrica, the telltale fire climax species), warm savannah scrub, economic plantations (mostly rubber) and agri cultural lands (MacKinnon 1988). 3. MATERIALS AND METHODS 3.1. Field data During field trips conducted in the summer of 1988, as much different vegetation classes as possible were indicated on enhanced pseudo-coloured hard copies of the TM image described below. Some classes yielding few re presentative pixels were dropped from further analysis. On the other hand, areas with particular homogeneous co lour, but that could not be visited, were selected from existing, albeit crude, vegetation maps of Mengyang. Additionally, some classes had to be divided into sub-classes due to their different aspect. 3.2. Image material and preprocessing The image available was a Landsat-5 Thematic Mapper image recorded on 2 February 1988 (frame 139/45). Its co 864

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