Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

Damen, M. C. J.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856343064

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: XV, 547 Seiten

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856343064

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,1)

Language:: English

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

Editor:: Damen, M. C. J.

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:: 4 Renewable resources in rural areas: Vegetation, forestry, agriculture, soil survey, land and water use. Chairman: J. Besenicar, Liaisons: M. Molenaar, Th. A. de Boer

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Studies on human interference in the Dhaka Sal (Shorea robusta) forest using remote sensing techniques. Md. Jinnahtul Islam

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Studies on human interference in the Dhaka Sal (Shorea robusta) forest using remote sensing techniques Md.Jinnahtul Islam Bangladesh Space Research and Remote Sensing Organization (SPARRSO), Agargaon, Sher-e-Bangla Nagar ABSTRACT: Bangladesh ie one of the most densely populated countries in the World. Because of the increasing population her demand for land and food are increasing day by day. Consequently the human interference on the forest areas are also increasing. The landless peasants encroach the forest areas cut and remove trees over night and convert forest land into dwelling houses and agricultural fields. In the hilly forests, the forest vegetation of the plateaus and valleys are cleared and terraced for cultivation. The present investigation indicates that fresh encroachment by raising new huts and clearing new forest areas for cultivation are going on thus causing severe problem. The objectives of this study are to identify on the aerial photographs and Landsat imagery the agricultural lands, villages, huts, ponds and market places in and near the forest area. The work also includes collection of data on human resources. The compilation of the data and information will be useful for development, management and protection of forest vegetation. The data will also be useful for the study of the human and economic resources of the environment. 1 INTRODUCTION The Dhaka forest is a tropical moist deciduous forest. This is one of the oldest natural forest of Bangla desh. It is situated between 23°50' and 24°25' North Latitude and 90°10' and 90 40' East Longitude. The forest tract exists in 200 Mouza of 30 Union Councils of Sadar North Subdivision of Dhaka District. It is situated only 20 miles away from the Dhaka Metropo litan city towards the North direction. The Dhaka forest is a pure Sal (Shorea robusta) coppice forest stands on the raised hillock like scattered patches of land. Besides the Sal (Shorea robusta) other species like Dhaman (Grewia species) Gandhi Gazaril, Amloki, Palash, Bohera, Kuteswar (Holerhena antidy- sentrica), nonkata (Randia dumetorum), khutikat (Glochindion velutinum), Gadila (Careya arborea), Piralu (Randi uliginosa) etc. are found to be sca ttered in the forest. Along the edges of the forest various kinds of herbs and shrubs are also found to grow along with Sal. Wild life have already been eradicated from the forest area without some minor species of birds and animals. The forest patches are of different size extending up to the maximum size of 500 acres. Some of them have only few trees and some of them have converted into scrub forest. The forest is inextricably mixed with habitation and agriculture. The mean maximum temperature of the area were found to be 85 F over the last ten years. The mean annual rainfall were found to be 70 inches over the same period. The relative humidity ranges from 96$- 41$ during the early and late hours of the day time. Thus the climate of the area may be taken as mode rately humid and the area always remain pleasant. Due to high population density and subsequent loss of ecosystem the forest area has lost its ori ginal cover density and vigour. The changes has been taken place mainly due to human interference in the forest. The type, cause and the result of human interference has been discussed in the main context. 2 HUMAN INTERFERENCE Illegal encroachment and thereby deforestation of the forest land is the worst type of human inter ference in the forest. The increasing rate of the propulation has created severe land hunger in the area. For the increased pupulation more lands are required for habitation and cultivation. The arable lands are already insufficient and the habitation are thickly populated. As a result they do not find any other alternative way without clearing some forest land adjoining their agricultural land and homesteads to meet a portion of their demand. Some times they clear lands in the deep forest areas and start a new settlement. As the forest is inextricably mixed with habitation and scattered in small patches, the pro tection of the forest from the encroachers is very difficult by limited number of forest staff whose head quarters are miles away. The sudden change of Government and their policies, the disturbance period during the sixties, the liberation war of 1971 and the subsequent deterioration of law and order situa tion in the country exerted substancial influence upon this forest area. A s a result about one third of the total area of the forest went under the illegal possession of the encroachers. Illicit felling and pilferage of forest produces is another type of human interference in the forest. As there is no large industry and cottage industry, unemployment problem is increasing day by day with the increase of population. The landless and unemploy ed people finding no other alternative way of earning their livings, gradually practice to collect forest produces by illicit felling and selling them in the near by market. Due to excessive price of the forest produce they become habitual smuggler. The fuel problem of the people living in the forest area is another cause of deforestation. They do not get gas and electricity for their daily common use. Naturally they have to depend upon the fire wood to meet up their coocking fuel, A s the fuel wood is out of their buying capacity they generally extract them from the forest. Besides the fire wood they also collect the house posts and thatching material from the forest. A s a result a vast area has been converted into scrub forest of little value. 3 AGRICULTURAL FRACTICE IN THE FOREST It has been stated that the forest area is an undulat ing landscape consisting of high lands locally called "chalas" which are intercepted by numerous narrow depression called "Baid". The chalas look like float ing islands over the areas. The forest crop and the habitation exist on these chalas. The "Baids" are used as paddy field. Both the Aus and transplanted Aman are practiced there. On the "chalas" fruits and seasonal vegetables are grown. Due to insufficiency of agri

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