基于MODIS NDVI的廣西西南典型生態(tài)區(qū)植被變化對比監(jiān)測

doi:10.3969/2014jms.0017

首頁 > 過刊瀏覽>2015年第35卷第1期 >93-99. DOI:10.3969/2014jms.0017

基于MODIS NDVI的廣西西南典型生態(tài)區(qū)植被變化對比監(jiān)測
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                        10.3969/2014jms.0017
                    
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基金項目:中國氣象局氣候變化專項(CCSF201308);廣西自然科學(xué)基金(2013GXNSFAA019283);廣西自然科學(xué)基金項目(桂科自0991207);廣西氣象局重點氣象科研與業(yè)務(wù)攻關(guān)項目(QK200602)

Vegetation variation in typical ecological sections of Southwest Guangxi based on MODIS NDVI data

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利用2001—2010年MODIS NDVI逐16 d合成數(shù)據(jù)對廣西十萬大山和桂西巖溶山地兩個典型生態(tài)區(qū)植被進行對比監(jiān)測,分析植被年內(nèi)變化特征及年際變化趨勢。利用同時期的氣溫和降水量數(shù)據(jù),分析兩個典型生態(tài)區(qū)植被NDVI對氣溫和降水量的響應(yīng)差異。結(jié)果表明:十萬大山和桂西巖溶山地生態(tài)區(qū)年內(nèi)MODIS NDVI變化特征相似,均表現(xiàn)出"夏秋高,冬春低"的趨勢,其中十萬大山生態(tài)區(qū)植被覆蓋相對穩(wěn)定,季節(jié)變化較小。近10 a來兩個生態(tài)區(qū)植被均以改善為主,植被改善面積與退化面積比例均約為3∶2。植被年際變化幅度較小,長勢較穩(wěn)定。降水量、平均氣溫與十萬大山生態(tài)區(qū)植被NDVI的相關(guān)性總體上好于桂西巖溶山地生態(tài)區(qū),兩個生態(tài)區(qū)植被與降水的相關(guān)性較一致。在夏季多表現(xiàn)為負相關(guān),春、秋、冬3季多表現(xiàn)為正相關(guān),這與廣西降水時段集中且強度較大的特點有關(guān)。由于植被類型的顯著差異,兩個生態(tài)區(qū)與氣溫的相關(guān)性具有顯著差異。

Abstract:

By using the 16 d MODIS NDVI series data during 2001 to 2010, the annual variation characteristics and interannual variation trends of vegetation in two typical ecological sections of Guangxi, Shiwandashan and Guixiyanrong, are analyzed. The mean data of precipitation and temperature are taken as climatic variables to compare the relationship between NDVI series and climatic factors over different types of ecological sections, which aims to explore the responses of climatic-driven factors to vegetation change for different ecological sections. Results show that the annual variation characteristics of Shiwandashan and Guixiyanrong ecological sections are similar, both of which exhibit higher values in summer and autumn and lower ones in winter and spring. The NDVI series of Shiwandashan ecological section change more stably with the smaller seasonal variation. The area of vegetation has been increasing in both two ecological sections in recent 10 years, and the ratio between areas of vegetation increasing and decreasing is about 3∶2. Vegetation vigor is stable and its interannual variability is smooth in these two ecological sections.The correlation of precipitation and temperature with vegetation NDVI in Shiwandashan ecological section is better than that in Guixiyanrong ecological section. The correlations of precipitation with the vegetacion in both two ecological sections are basically consistent, which shows negative in summer but positive in other three seasons on the whole. It is closely related to the precipitation characteristics of Guangxi. Due to the significant differences of the types of vegetation, the correlation of temperature with vegetation varies in the two ecological sections.

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陳燕麗,黃敏堂,莫偉華,陸虹,王君華.基于MODIS NDVI的廣西西南典型生態(tài)區(qū)植被變化對比監(jiān)測.氣象科學(xué),2015,35(1):93-99 CHEN Yanli, HUANG Mintang, MO Weihua, LU Hong, WANG Junhua. Vegetation variation in typical ecological sections of Southwest Guangxi based on MODIS NDVI data. Journal of the Meteorological Sciences,2015,35(1):93-99

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收稿日期:2013-06-24
最后修改日期:2014-03-04
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在線發(fā)布日期: 2015-03-13
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