Analysis of Spatial-Temporal Characteristics of Drought Variation in Grassland Area of Inner Mongolia Based on TVDI
CHENG Wei, XIN XiaoPing,Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/Hulunber Grassland Ecosystem Observation and Research Station, Beijing 100081
Abstract 【Objective】 To study the spatio-temporal characteristics of temperature vegetation drought index (TVDI) in the grassland area of Inner Mongolia in the past 18 years and to explore the relationship between TVDI and meteorological factors, so as to provide theoretical reference for ecological warning and ecological restoration of the study area. 【Method】 Based on MODIS enhanced vegetation index (EVI) and land surface temperature (LST) products to build Ts-EVI characteristic space, according to the characteristic space to calculate TVDI, for normal value of accumulated year of TVDI using unary the Theil-Sen Median trend analysis and Mann-Kendall examination to study the spatial distribution, time-varying characteristics and spatiotemporal evolution trend of drought in the study area during 18 years. 【Result】 On the whole, the average drought degree of grassland in Inner Mongolia is high in southwest and low in northeast, and the average annual TVDI of all grassland types is in order of temperate desert type>temperate steppe-desert type>temperate desert-steppe type>marsh type>temperate steppe type>temperate meadow-steppe type>lowland meadow type>montane meadow type. Among them, the desert grasslands (temperate desert type, temperate steppe-desert type and temperate desert-steppe type) are mainly in the state of severe and mild drought, while non-desert grasslands (temperate steppe type, temperate meadow steppe type, lowland meadow type, mountain meadow type and marsh type) are mainly in the state of mild drought, normal state and mild wetness. Over the past 18 years, the desert grassland has been gradually drying out. In contrast, the non-desert grassland is basically getting wet slowly except for temperate steppe type. In terms of spatial distribution, the total area ratios of the three types of desert grasslands with stable drought degree and drying tendency (slight drying, drying and significant drying) are respectively 44.93% and 55.01%. The total area ratios of the five types of non-desert grassland with stable drought degree and wetting trend (slightly wetting, wetting and significantly wetting) were 72.19% and 24.27%, respectively. 【Conclusion】 Therefore, in the past 18 years, the drought situation of desert grassland is mainly stable and continuous drying, and there are more areas that keep drying, so the ecological environment of grassland continues to deteriorate. The drought situation of non-desert grassland is mainly stable, a small part of the area has a tendency of becoming wet, so the ecological environment of grassland is improving steadily. In addition, the lack of precipitation has a significant effect on the drought degree of non-desert grassland, but not on the desert grassland. The increase of temperature only has a significant effect on the drought degree of the temperate steppe type and the temperate steppe-desert type. Keywords:temperature vegetation drought index;remote sensing;spatial and temporal characteristics;Inner Mongolia;grassland type
PDF (4616KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 程伟, 辛晓平. 基于TVDI的内蒙古草地干旱变化特征分析[J]. 中国农业科学, 2020, 53(13): 2728-2742 doi:10.3864/j.issn.0578-1752.2020.13.020 CHENG Wei, XIN XiaoPing. Analysis of Spatial-Temporal Characteristics of Drought Variation in Grassland Area of Inner Mongolia Based on TVDI[J]. Scientia Acricultura Sinica, 2020, 53(13): 2728-2742 doi:10.3864/j.issn.0578-1752.2020.13.020
TD-温性荒漠类;TS-温性草原类;TSD-温性草原化荒漠类;TDS-温性荒漠草原类;TMS-温性草甸草原类;LM-低地草甸类;MM-山地草甸类;M-沼泽类 Fig. 4The area ratio of different drought grades in different grassland types
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