| 近18年内蒙古赤峰地区植被覆盖度与气候因子的关系 |
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| 引用本文： | 魏学. 近18年内蒙古赤峰地区植被覆盖度与气候因子的关系[J]. 畜牧与饲料科学, 2018, 39(4): 59-59. DOI: 10.12160/j.issn.1672-5190.2018.04.018 |
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| 作者姓名： | 魏学 |
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| 作者单位： | [1]赤峰市气象局,内蒙古赤峰024000 |
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| 摘 要： | 利用2000—2017年4—9月MODIS的16d归一化植被指数(NDVI)合成产品和1961—2017年逐日气温、降水量资料,分析了内蒙古赤峰地区植被覆盖度变化趋势及其对气候因子的响应。结果表明,近57年来赤峰地区平均气温呈显著升高趋势(P<0.05),升温速度0.22℃/10a,降水量呈微弱减少趋势,减少速率为3.38mm/10a;气温和降水逐月变化呈单峰态分布,7月平均气温(22.4℃)和降水量(118.9mm)显著高于其他月份。近18年来,赤峰地区逐年NDVI呈显著增加趋势(P<0.05),增加速率为0.0025/a,逐月NDVI呈单峰型变化趋势,峰值出现在7月(0.7594)、8月(0.7262);赤峰地区NDVI与4—9月、6月、7月、8月降水量均呈正相关关系(显著水平为P<0.01),相关系数分别为0.730、0.724、0.789、0.782,5月、9月降水量与NDVI呈正相关关系(显著水平为P<0.05);平均气温与NDVI呈正相关关系但相关关系较弱。
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Relationship between Vegetation Coverage and Climatic Factors in Chifeng Area of Inner Mongolia in Recent 18 Years |
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| Abstract: | By using the 16-day normalized difference vegetation index(NDVI)composite product of MODIS of April to September from 2000 to 2017 and the daily temperature and precipitation data from 1961 to 2017 in Chifeng area of Inner Mongolia,the changing trend of the vegetation coverage in this area and its refection against the climate factors were investigated.The average temperature in Chifeng area exhibited an significant elevating tendency in recent 57 years(P<0.05)with a rate of 0.22℃/10 a.The precipitation was slightly decreased with a rate of 3.38 mm/10 a.The monthly variation of temperature and precipitation expressed a unimodal distribution mode,and the average temperature(22.4℃)and precipitation(118.9 mm)in July were significantly higher than those in other months.Over the past 18 years,the yearly NDVI had increased significantly in Chifeng area(P<0.05)with a rate of 0.002 5/a.The monthly variation of NDVI showed a single peak trend and the peak was observed at July(0.759 4)and August(0.726 2).The NDVI was extremely significantly and positively correlated with the precipitation of April to September,June,July and August(P<0.01)with the correlation coefficients of 0.730,0.724,0.789 and 0.782,respectively.The precipitation of May and September had a significantly positive correlation with NDVI(P<0.05).There was no significantly positive correlation between average temperature and NDVI(P>0.05). |
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