| 西藏高原土壤水分遥感监测方法研究 |
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| 引用本文： | 除多,次仁多吉,德吉央宗,等.西藏高原土壤水分遥感监测方法研究[J].高原山地气象研究,2016,36(2):1-7. |
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| 作者姓名： | 除多 次仁多吉 德吉央宗 等 |
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| 作者单位： | 1. 中国气象局成都高原气象研究所拉萨分部, 拉萨 850000; |
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| 基金项目： | 公益性行业(气象)科研专项(GYHY201206040；GYHY201306054)；国家自然基金项目(41561017) |
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| 摘 要： | 土壤水分是植物生长、发育的必要条件,是研究农牧业干旱程度的重要指标,监测土壤水分对农业、旱情、气候等具有重要意义。本研究分析了西藏高原实测土壤湿度与同期MODIS植被供水指数和波段7反射率之间的关系。结果表明,MODIS第7波段单窗算法是较为有效和简便的西藏高原土壤水分监测方法,对高原中部植被生长季基于MODIS波段7的二次多项式监测模型较好,而对整个高原非生长季三次多项式监测模型效果较好,MODIS第7波段同样可以用于高原农田土壤湿度的遥感监测。
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| 关 键 词： | 土壤水分 MODIS 西藏高原 |
| 收稿时间： | 2016-03-05 |
Approach to Monitoring Soil Moisture Using MODIS Imagery in Tibet |
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| Affiliation: | 1. Lhasa Campus of Institute of Plateau Meteorology, Chengdu, CMA, Lhasa 850000, China;2. Tibet Center for Remote Sensing Application and Research, Lhasa 850000, China;3. Lhasa Meteorological Service, Lhasa 850000, China |
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| Abstract: | Soil moisture plays an important role in surface energy balances,regional runoff,potential drought and crop yield etc. Traditional measurement of soil moisture is a time-consuming job and only limited samples could be collected. Many problems would be results from extending those point measurements to 2D space,especially for a regional area with heterogeneous soil characteristics. The emergency of remote-sensing technology makes it possible to rapidly monitor soil moisture on a regional scale. In this paper,research progress in soil moisture and drought monitoring based on satellite remote sensing is briefly introduced first. Then,MODIS vegetation supplication water index(VSWI) at a 1km scale and MODIS band 7 reflectivity at a 0. 5km scale have been combined respectively with ground measured soil moisture to determine regression relationships. The result shows that MODIS VSWI and MODIS band 7 reflectivity are significantly correlated with the ground measured soil moisture during the growing season in the central Tibet and the coefficients of quadratic polynomial regression reach 0. 84 and 0. 88,respectively. Due to strong heterogeneity of soil type and vegetating cover in Tibet,compared to other methods,the cubic polynomial regression model based on reflectivity of MODIS band 7 is more effective way to monitor soil moisture content for non-growing season in whole Tibet area. MODIS band 7 can be used to estimate soil moisture content of non-growing season's agriculture land as well. In a word,MODIS band 7 is a simple and effective soil moisture and drought monitoring approach compared to other remote sensing based methods for the Tibet region. |
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