Assessing land transformation and associated degradation of the Indian Ganga River Basin using forest cover land use mapping and residual trend analysis

论文摘要

The Indian Ganga River Basin（IGRB） has experienced continuous land transformation since the Indus Valley Civilisation shifted from the Indus basin to the Ganga basin. Particularly in the last few decades the land transformation has increased many-folds due to the changing climate and rapid increase in population. In this paper, we assessed land transformation and associated degradation in the IGRB based on the forest cover land use（FCLU） mapping and residual trend analysis（RTA）. The FCLU maps for 1975 and 2010 were generated using 216 Landsat satellite images and validated using 1509 ground points. We mapped 29 forest and 18 non-forest types and estimated a total loss of 5571 km2 forest cover and expansion in settlement areas（5396 km2）. Other major changes mapped include a decrease in wetlands and water bodies, while an increase in agriculture and barren lands with an overall mapping accuracy of 85.3%（kappa, 0.82） and 88.43%（kappa, 0.84） for 1975 and 2010, respectively. We also performed the RTA analysis using GIMMS-NDVI3 g to identify areas of significant negative vegetative photosynthetic change as an indicator for land degradation. All the RTA models showed monotonic nature of the residual trends and resulted as moderately positive but highly significant（P<0.001）. Land degradation in the form of barren land accompanied by a decline in vegetation quality and coverage was found prominent in the basin with a possibility of an accelerated rate of land degradation in future due to the rapid loss of permanent forest cover.

论文目录

• 1 Introduction
• 2 Materials and methods
•   2.1 Study area
•   2.2 Data
•   2.3 Methods
•     2.3.1 Forest cover land use mapping
•     2.3.2 Residual NDVI trend
•     2.3.3 RTA analysis
•     2.3.4 Consistency measurement
•   2.4 Evidence of land degradation
• 3 Results
•   3.1 Land transformation during 1975–2010
•   3.2 NDVI change and residual patterns of rainfall and soil moisture
•   3.3 RTA temporal variation of annual NDVI residuals
•   3.4 Mann-Kendall trend consistency analysis
•   3.5 Land degradation in major land cover types
• 4 Discussion
•   4.1 FCLU change and land degradation
•   4.2 Residual change and its consistency
•   4.3 Land cover change and degradation
• 5 Conclusions

文章来源

类型: 期刊论文

作者: Shafique MATIN,Sujit GHOSH,Mukunda D BEHERA

来源: Journal of Arid Land 2019年01期

年度: 2019

分类: 基础科学,工程科技Ⅰ辑,经济与管理科学

专业: 环境科学与资源利用,农业经济

单位: Centre for Oceans, Rivers, Atmosphere and Land Sciences, Indian Institute of Technology Kharagpur

分类号: X87;F301.2

页码: 29-42

总页数: 14

文件大小: 1912K

下载量: 16