【摘 要】
：
Drought is a natural phenomenon posing severe implications for soil,groundwater and agricultural yield.It has been recognized as one of the most pervasive global change drivers to affect the soil.Soil being a weakly renewable resource takes a long time to
【机 构】
：
Department of Geography,Faculty of Natural Sciences,Jamia Millia Islamia,New Delhi,India;School of E
论文部分内容阅读
Drought is a natural phenomenon posing severe implications for soil,groundwater and agricultural yield.It has been recognized as one of the most pervasive global change drivers to affect the soil.Soil being a weakly renewable resource takes a long time to form,but it takes no time to degrade.However,the response of soil to drought conditions as soil loss is not manifested in the existing literature.Thus,this study makes a concerted effort to analyze the relationship between drought conditions and soil erosion in the middle sub-basin of the Godavari River in India.MODIS remote sensing data was utilized for driv-ing drought indices during 2000-2019.Firstly,we constricted Temperature condition index(TCI)and Vegetation Condition Index(VCI)from Land Surface Temperature(LST)and Enhanced Vegetation Index(EVI)derived from MODIS data.TCI and VCI were then integrated to determine the Vegetation Health Index(VHI).Revised Universal Soil Loss Equation(RUSLE)was utilized for estimating soil loss.The rela-tionship between drought condition and vegetation was ascertained using the Pearson correlation.Most of the northern and southern watersheds experienced severe drought condition in the sub-basin during 2000-2019.The mean frequency of the drought occurrence was 7.95 months.The average soil erosion in the sub-basin was estimated to be 9.88 t ha-1 year-1.A positive relationship was observed between drought indices and soil erosion values(r value being 0.35).However,wide variations were observed in the distribution of spatial correlation.Among various factors,the slope length and steepness were found to be the main drivers of soil erosion in the sub-basin.Thus,the study calls for policy measures to lessen the impact of drought and soil erosion.
其他文献
教师自我反思性评价不仅是教师评价体系中的重要组成部分,还是促进教师专业发展、提高课堂教学效率的重要途径.本文基于数字化观察手段,通过“多元交互式”课堂观察平台,对教师课堂提问行为展开自我反思性评价研究,发现教师在提问行为中主要存在提问频数过大、候答时间不足和理答能力较弱等问题,并提供相关改进建议,在提升教师提问水平、促进教师专业发展的同时,也为地理教师开展自我反思性评价提供新方法,为相关研究提供新思路.
Cloud-to-ground (CG) lightning data and the ECMWF ERA-Interim reanalysis dataset are analyzed to gain insight into the spatiotemporal distribution and synoptic background of winter-season CG flashes between December 2010 and February 2020 in China. We ide
This study presents the radar-based characteristics and formation environment of supercells spawned by the tornadic landfalling Typhoon Mujigae (2015) in October 2015. More than 100 supercells were identified within a 24-hour period around the time of the
Traditionally, a delayed (early) onset of the South China Sea summer monsoon (SCSSM) has been observed to follow a warm (cold) El Ni?o-Southern Oscillation (ENSO) event in winter, supporting high seasonal predictability of SCSSM onset. However, the empiri
1.OverviewrnThe 2021 Nobel Prize for Physics was awarded to three scientists for their contribution to the physical understanding of complex systems (The Nobel Committee for Physics, 2021). Two of the laureates, Dr. Syukuro MANABE and Dr. Klaus HASSELMANN
Moisture contribution and transport pathways for Central Asia (CA) are quantitatively examined using the Lagrangian water cycle model based on reanalysis and observational data to explain the precipitation seasonality and the moisture transport variation
Rainfall amount in mid-summer (July and August) is much greater over eastern than western Sichuan, which are characterized by basin and plateau, respectively. It is shown that the interannual variations of extreme rainfall over these two regions are rough
Ocean spiciness is referred to as density-compensated temperature and salinity variations with warm (cool) and salty (fresh) waters having high (low) spiciness, respectively. The structure and evolution of density-compensated (warm/salty or cool/fresh) sp
The current margins of the North China and Yangtze Cratons provide arguably the best examples globally of anomalously high mineral endowment within a 100 km buffer zone,hosting 66 diverse world-class to giant ore systems that help explain China\'s premi
M?ssbauer spectroscopy has been used widely to characterize the ferric(Fe3+)and ferrous(Fe2+)propor-tions and coordination of solid materials.To obtain these accurately,the recoilless fraction is indispensi-ble.The recoilless fractions(f)of iron-bearing m