Volume No. 10 Issue No.: 3 Page No.: 407-422 Jan-Mar 2016

 

GEO-ENVIRONMENTAL ASSESSMENT FOR LAND CAPABILITY CLASSIFICATION OF SELECTED SUBWATERSHEDS OF THE SIANG RIVER OF ARUNA CHAL PRADESH, INDIA USING REMOTE SENSING AND GIS TECHNIQUES

 

Dutta H., Goswami D. C. and Karmakar R. M.

1. State Remote Sensing Application Centre, Arunachal Pradesh (INDIA)
2. Department of Environmental Science, Gauhati University, Assam (INDIA)
3. Department of Soil Science, Assam Agricultural University, Jorhat, Assam (INDIA)

 

Received on : November 14, 2015

 

ABSTRACT

 

Geo-environmental assessment for land capability classification was carried out through Remote sensing and GIS techniques in a cluster of sub-watersheds of four tributaries viz., Kemi, Sille, Leko and Sibo Korong of the mighty Siang River in Arunachal Pradesh, India. The study area covers a total geographical area of 788.60 sq. km. Geo-environmental factors like slope, erosion hazards, flooding, drainage, surface texture, surface coarse fragments, subsurface coarse fragments, soil depth and profile development along with soil fertility factors (CEC and organic carbon of soil) were used for assessment of land capability classification. Eighteen soil mapping units occurring on different landforms namely, flood plain, alluvial plain, piedmont plain and hills with various slopes were identified and studied. The climate of the study area is hot humid sub-tropical with mean annual rainfall of over 3983.34 mm, mean humidity of 70-80%, mean annual temperature of 20.6?C, mean annual summer temperature of 24.0?C and mean annual winter temperature of 15.7?C. Results showed that the studied soils belonged to six Land Capability Classes (LCC) and seven LCC subclasses namely, IIs, IIIs, IIIws, IVes, VIes, VIIes and VIIIes covering areas of 131.6, 35.2, 168.1, 161.1, 67.7, 53.3 and 48.1 sq. km. respectively and constituting 16.69, 4.46, 21.32, 20.43, 8.58, 6.76 and 6.10 per cent of the study area respectively. The soils on alluvial plain belonged to LCC subclasses IIs and IIIs having limitations of slope, erosion, surface texture soil depth and organic carbon content. The soils on flood plain constituting 21.32 per cent of the study area belonged to LCC subclass IIIws. These soils have flood hazards and limitations of coarse texture and less profile development. The soils on piedmont plain and hills (10-25% slope) belonged to LCC subclass IVes. With judicious soil and water management and soil fertility improvement, LCC subclass IIs, IIIs, IIIws and IVes can be utilized for growing different crops depending on their degree of limitations. The soils developed on hills (over 25% slopes) belonged to LCC subclasses VIes to VIIIes. These soils have hazards of severe soil erosion and limitations of coarse surface texture, soil depth and soil acidity. These soils are not suitable for arable crops but suitable for grazing and forest plantation.

 

Keywords : Geo-environment, Remote sensing, GIS, Slope, Drainage, Land capability classification

 

 

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