Response of Vegetation NDVI in Bailongjiang Basin to Climatic Changes During the Past Sixteen Years
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摘要: 白龙江流域的植被与近16年来气温、降水的变化存在着密切关系。其中在流域中下游区域(宕昌、舟曲、武都、文县)植被与降水呈显著正相关。不同季节气温和降水对植被的影响存在着明显差异,春季气温与植被的关系以正相关为主,其中显著正相关的像元占比为26.07%,主要位于流域中上游;夏季降水与生态植被的关系以正相关为主,其中显著正相关的像元占比为11.21%,主要位于流域中下游区域;秋季气温和降水与植被的关系类似,即在流域西部为负相关、流域东部为正相关,其中显著负相关的像元占比分别为7.13%(气温)和40.74%(降水)。生长季贯穿春季到初秋的时段,气温和降水与植被的关系呈显著正相关的像元占比分别为22.08%和28.65%。Abstract: There was a closely relationship between ecological vegetation and changes in temperature and precipitation during the past sixteen years in the Bailongjiang basin. There has been a significantly positive relationship between the vegetation index (NDVI) and the precipitation within the middle and down reaches of the Bailongjiang basin (Tanchang, Zhouqu, Wudu, Wenxian). The influence of temperature and precipitation in different seasons on vegetation showed significantly diverse. In spring, the relationship between temperature and vegetation was mainly positive, among which the significant positive correlation pixel proportion is 26.07%, mainly located in the middle and upper reaches of the watershed. In summer, there was a positive relationship between precipitation and NDVI, with significant pixels of more than 11.21%, located in the middle and lower reaches of the Bailongjiang basin. In autumn, the relationship between temperature and vegetation was similar to precipitation, which was negatively correlated in the west and positively correlated in the east, of which the significant negative correlation pixel proportion was 7.13% (temperature) and 40.74% (precipitation), respectively. During the growing season (from spring to early autumn), there has been a positive relationship between temperature and NDVI as well as precipitation and NDVI, with significant pixels more than 22.08% (temperature) and 28.65% (precipitation), respectively.
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Key words:
- vegetation /
- climatic change /
- response /
- Bailongjiang basin
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表 3 白龙江流域不同季节植被NDVI与气温相关关系类型统计
Table 3. Correlations between NDVI and air temperature in different seasons in Bailongjiang basin
变化类型 春季(%) 夏季(%) 秋季(%) 生长季(%) 显著负相关 0.02 8.05 7.13 0.46 不显著负相关 3.03 39.86 45.72 31.54 不显著正相关 70.88 48.98 42.68 45.92 显著正相关 26.07 3.11 4.47 22.08 注:显著正、负相关指达到P<0.05的显著性水平。 表 1 白龙江流域不同季节NDVI变化类型统计
Table 1. Statistics of NDVI change types in Bailongjiang basin in different seasons
变化类型 NDVI变化(%) 春季 夏季 秋季 生长季 减少(P<0.05) 24.85 46.69 62.17 46.89 增加(P<0.05) 75.15 53.31 37.83 53.11 减少(P<0.01) 43.21 63.00 71.90 58.91 增加(P<0.01) 56.79 37.00 28.10 41.09 表 2 白龙江流域年际NDVI与气温、降水相关关系类型统计
Table 2. Correlations between annual mean NDVI and air temperature and precipitation in Bailongjiang basin
变化类型 气温(%) 降水(%) 显著负相关 0.07 0.04 不显著负相关 20.00 13.67 不显著正相关 53.92 58.46 显著正相关 26.01 27.83 注:显著正、负相关指达到P<0.05的显著性水平。 表 4 白龙江流域不同季节植被NDVI与降水相关关系类型统计
Table 4. Correlations between NDVI and precipitation in different seasons in Bailongjiang basin
变化类型 春季(%) 夏季(%) 秋季(%) 生长季(%) 显著负相关 0.03 0.10 40.74 0.07 不显著负相关 2.78 22.33 28.21 10.73 不显著正相关 54.59 66.36 28.11 60.55 显著正相关 42.60 11.21 2.94 28.65 注:显著正、负相关指达到P<0.05的显著性水平。 -
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