HOU Liqin,ZHANG Jin.Spatiotemporal Variation of Surface Soil Moisture Based on Temperature Vegetation Dryness Index (TVDI) in Qinshui Coalfield[J].Research of Soil and Water Conservation,2017,24(03):177-182.
基于TVDI的沁水煤田地表土壤水分时空演变分析
- Title:
- Spatiotemporal Variation of Surface Soil Moisture Based on Temperature Vegetation Dryness Index (TVDI) in Qinshui Coalfield
- Keywords:
- soil moisture; normalized difference vegetation index (NDVI); temperature vegetation dryness index (TVDI); space distribution; Qinshui coalfield
- 分类号:
- S152.7;TP79
- 摘要:
- 温度植被干旱指数（Temperature Vegetation Dryness Index，TVDI）是表征地表干旱的有效指标，其时空格局分析是地表干旱与全球环境变化相互影响下的地表覆被变化的研究内容。以山西沁水煤田为研究区，结合2000—2010年MODND1M和MODLT1M数据，构建了NDVI-Ts特征空间并对干湿边拟合分析。结果表明：近11年来，沁水煤田年平均TDVI均大于0.4，且总体呈显著增加趋势，地表土壤湿度很低，部分区域处于中度和重度干旱之间。年度内，月平均TVDI处于0.5~0.7之间，且7月份TDVI存在明显波动。在空间上，研究区地表土壤湿度分布与地表植被分布基本一致。煤田南部和东部以干旱和极干旱为主，西北山区地带以正常或湿润为主，矿区密集区土壤湿度含量明显低于其他地区，矿井分布附近较其他区域地表干旱现象突出。
- Abstract:
- Temperature Vegetation Dryness Index (TVDI) is a valid indicator to reflect the surface drought. TVDI and the spatiotemporal variation of soil moisture are research topics of global environmental change and the surface soil drought. The variation affects the surface cover change. This method can be used to research the change of ecological environment in coal-field. Taking Qinshui coalfield, Shanxi Province, as an example, combining MODND1M and MODLT1M data of 2000—2010, we built NDVI-Ts feature space and analyzed the dry and wet edges. According to TVDI, the spatiotemporal and variation characteristics of soil moisture were studied. The results showed that the soil moisture of coal surface increased in the past 11 years, and in 2005 before and after the change was bigger. Within the year, monthly average the temperature vegetation dryness index was at around 0.5, and it was obvious fluctuation in July. In space, the distribution of soil moisture was consistent with vegetation distribution in the study area. The two characteristics were basically identical. Coalfield gives priority to arid and extremely arid in the north and east, the southern and eastern mountainous areas were given priority to arid and extreme drought. Simultaneously, in the northwest mountainous areas, soil moisture was mainly normal or moist. The content of soil moisture in mined-out areas was significantly lower than the other regions. The drought phenomenon near the mine is more prominent than distant region.
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备注/Memo
收稿日期:2016-03-23;改回日期:2016-05-30。
基金项目:山西省基础研究计划项目（青年）“近30年来山西省农业干旱时空演变规律及其对气候变化的响应研究”（2014021032-1）
作者简介:侯莉琴(1976-),女,山西离石人,博士研究生,讲师,主要从事地表覆被变化与空间数据处理研究。E-mail:houliqin@tyut.edu.cn