遼寧省耕地植被指數(shù)變化特征分析

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遼寧省耕地植被指數(shù)變化特征分析
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中圖分類(lèi)號(hào):S165
基金項(xiàng)目:科技部農(nóng)業(yè)科技成果轉(zhuǎn)化項(xiàng)目(編號(hào):05EFN217400412)，遼寧省科技廳攻關(guān)項(xiàng)目(編號(hào):2001207003)共同資助

THE ANALYSIS ABOUT CHANGES OF CULTIVATED LAND VEGETATION INDEX IN LIAONING PROVINCE

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利用NOAA/AVHRR資料通道1(0.58~0.68μm)、通道2(0.725~1.1μm)數(shù)據(jù)計(jì)算歸一化植被指數(shù)(NDVI),對(duì)遼寧省5個(gè)氣候區(qū)內(nèi)1999~2004年208個(gè)旱田監(jiān)測(cè)點(diǎn)和84個(gè)水田監(jiān)測(cè)點(diǎn)的作物生長(zhǎng)狀況進(jìn)行連續(xù)監(jiān)測(cè),分析NDVI年際、旬際變化特征。結(jié)果表明:遼寧耕地(旱田、水田)植被指數(shù)年際間差異明顯,造成旱田年際變化以及地區(qū)差異的主要原因是降水時(shí)空分布不均勻的結(jié)果,因此旱田2004年NDVI達(dá)到近年最大,2001年較低;而造成水田年際差異以及地區(qū)差異的原因是受水田用水狀況以及光溫條件的影響,水田2003年NDVI最大,2001年較低。在整個(gè)生長(zhǎng)季內(nèi)(5~9月份),遼寧耕地植被指數(shù)呈單峰型變化,從5月上旬開(kāi)始到6月中旬是緩慢增長(zhǎng)階段,6月下旬到8月下旬快速增長(zhǎng)并達(dá)到最大,之后又迅速降低;2004年耕地植被指數(shù)旬變化趨勢(shì)與6 a平均植被指數(shù)旬變化趨勢(shì)基本相同,但作物生長(zhǎng)前期NDVI較6 a平均值低,主要原因是受到2004年春夏之交嚴(yán)重干旱的影響。

Abstract:

Using the datum of NOAA/AVHRR of passway 1 (0.58～0.68 μm) and passway 2(0.725～1.1 μm), the normalized difference vegetation index (NDVI ) is calculated.The plants growing situation is continuously monitored and NDVI is analyzed in 208 monitoring points of dry land and 84 monitoring points of paddy field of five climatic regions in Liaoning Province in 1999～2004.The results show that the annual variation difference of cultivated land vegetation index is obvious in Liaoning Province. The main reason for annual change as well as the regional disparity of dry farmland is the non-uniformity of time-space distribution of precipitation,therefore, NDVI of the dry farmland in 2004 achieved the biggest in recent years,it is low in 2001.The annual change and regional disparity of the paddy field result from the difference in condition of water used in paddy field and light and temperature as well. NDVI of the paddy field in 2003 is the biggest, it is low in 2001. In growing period (May~September),the unimodal type of NDVI is found in the cultivated land(dry land,paddy field ) in Liaoning,the NDVI has increased slowly,from the first ten days of May to the mid-June, then has increased fast and reaches the maximum from the last ten days of June to the last ten days of August,finally, it reduced rapidly.Most of NDVI for ten days period of cultivated land in 2004 showed the same tendency as 6 years average, but during crops growing it is less than the latter (1999～2004)because of the arid of the same period.

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武晉雯,紀(jì)瑞鵬,張玉書(shū),楊素英.遼寧省耕地植被指數(shù)變化特征分析.氣象科學(xué),2006,(3):279-285 Wu Jinwen, Ji Ruipeng, Zhang Yushu, Yang Suying. THE ANALYSIS ABOUT CHANGES OF CULTIVATED LAND VEGETATION INDEX IN LIAONING PROVINCE. Journal of the Meteorological Sciences,2006,(3):279-285

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