| Study on correlation between NDVI and precipitation in Longdong |
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| DOI：10.7606/j.issn.1000-7601.2009.06.47 |
| Key Words: NDVI SPI Longdong |
| Author Name | Affiliation | | LIANG Yun | Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Lanzhou, Gansu 730020, China；Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China | | JIN Wenyan | Pulandian Meteorological Bureau of Liaoning Province, Pulandian, Liaoning 116200, China | | GUO Ni | Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China | | LIU Shixiang | Lanzhou Central Meteorological Observatory, Lanzhou, Gansu 730020, China | | HAN Tao | Lanzhou Regional Climate Center, Lanzhou, Gansu 730020, China |
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| Abstract: |
| Normalized difference vegetation index(NDVI) can be characterized as an indicator of vegetable growing conditions while precipitation resources is a key factor to affect the vegetable growing conditions and ecological construction in Longdong of Gansu.The correlation between NDVI and different-temporal-scale standard precipitation index(SPI) in Longdong of Gansu are studied based on the data of NOAA/AVHRR and precipitation over the same period in 1982～2003.The results show:(1) The sensitivity of vegetable to precipitation is more significant to semi-arid area than semi-humid area in vegetable growing season;(2) The most significant correlation is found in NDVI and 3-SPI while the most insignificant is in NDVI and 1-SPI;(3) The annual-variational amplitudes of NDVIs are-12%～10% in semi-arid area and-10%～13% in semi-humid area,respectively,which agree well with SPI in the former at 95% significant level (P<0.05), but not significant in the latter;(4) Annual NDVIs are significantly correlated with the precipitations of four seasons in arid area (P<0.05) while significant only in winter and spring in semi-humid area. |
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