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Dharumarajan, S.
- Status of Desertification in South India – Assessment, Mapping and Change Detection Analysis
Abstract Views :207 |
PDF Views:82
Authors
S. Dharumarajan
1,
M. Lalitha
1,
Rajendra Hegde
1,
N. Janani
1,
A. S. Rajawat
2,
K. L. N. Sastry
2,
S. K. Singh
3
Affiliations
1 ICAR-National Bureau of Soil Survey and Land Use Planning, Hebbal, Bengaluru - 560 024, IN
2 ISRO-Space Applications Centre, Ahmedabad - 380 015, IN
3 ICAR-National Bureau of Soil Survey and Land Use Planning, Amaravati Road, Nagpur - 440 033, IN
1 ICAR-National Bureau of Soil Survey and Land Use Planning, Hebbal, Bengaluru - 560 024, IN
2 ISRO-Space Applications Centre, Ahmedabad - 380 015, IN
3 ICAR-National Bureau of Soil Survey and Land Use Planning, Amaravati Road, Nagpur - 440 033, IN
Source
Current Science, Vol 115, No 2 (2018), Pagination: 331-338Abstract
Desertification is the transformation of productive land into a non-productive one due to poor resource management, and unfavourable biophysical and economical factors. Periodical assessment of desertification status is imperative for a suitable comprehensive and combating plan. In the present study, desertification status maps of Andhra Pradesh (AP), Karnataka and Telangana in South India have been prepared using remote sensing data for two time-frames (2003– 2005 and 2011–2013) and change detection analysis has been carried out. The results reveal that 14.35%, 36.24% and 31.40% of the total geographical area in Andhra Pradesh, Karnataka and Telangana were affected by desertification processes respectively, in 2011–2013. Among the desertification processes, vegetal degradation contributes 7.27% of total area in AP, followed by water erosion (4.93%) and waterlogging (0.83%), whereas in Karnataka water erosion (26.29%) is dominant followed by vegetal degradation (8.93%) and salinization (0.45%). Change detection analysis shows that desertification processes of AP and Karnataka have increased by 0.19% and 0.05% respectively, whereas in Telangana it has decreased by about 0.52% from 2003 to 2005 data. The present database will help the scientists, planners and stakeholders to prepare appropriate land reclamation measures to control the increasing trend of desertification.Keywords
Change Detection Analysis, Desertification, Salinization, Vegetal Degradation, Waterlogging.Full Text
References
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- Pedotransfer Functions for Predicting Soil Hydraulic Properties in Semi-Arid Regions of Karnataka Plateau, India
Abstract Views :182 |
PDF Views:78
Authors
Affiliations
1 ICAR-National Bureau of Soil Survey and Land Use Planning, Regional Centre, Hebbal, Bengaluru 560 024, IN
2 ICAR-National Bureau of Soil Survey and Land Use Planning, Amaravati Road, Nagpur 440 033, IN
1 ICAR-National Bureau of Soil Survey and Land Use Planning, Regional Centre, Hebbal, Bengaluru 560 024, IN
2 ICAR-National Bureau of Soil Survey and Land Use Planning, Amaravati Road, Nagpur 440 033, IN
Source
Current Science, Vol 116, No 7 (2019), Pagination: 1237-1246Abstract
Soil hydraulic properties are important for irrigation scheduling and proper land-use planning. Field capacity, permanent wilting point and infiltration rate are the three vital hydraulic properties which determine the availability and retention of water for crop growth. These properties are difficult to measure and time-consuming, but can be easily predicted from the available information like soil texture, bulk density, organic carbon content, etc. through pedotransfer functions (PTFs). PTFs were developed for field capacity and permanent wilting point for two different regions of Karnataka, viz. Northern Karnataka Plateau (512 soil samples) and Southern Karnataka Plateau (228 soil samples), separately. PTF for infiltration rate was developed using 100 soil samples for the entire Karnataka. Cross-validation techniques were used to validate the PTFs, and the results are satisfactory with low RMSE and higher R2. The developed PTFs are useful in determining soil hydraulic properties of the semi-arid regions of southern India.Keywords
Pedotransfer Functions, Field Capacity, Permanent Wilting Point, Infiltration Rate, Semi-Arid Regions.Full Text
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