Long-term changes in area and soil total nitrogen and total phosphorus storage in croplands of the densely populated village landscapes of China′s Yangtze Plain Study on Land Use and Land Cover Change in Tianzhu County,Northeast End of Qinghai-Tibet Plateau Applying Remote Sensing to Assessing Land Use and Land Cover Change, and Its Impact on Soil Erosion: Case of Pali Gad Watershed, Northern India