科技通报
科技通報
과기통보
BULLETIN OF SCIENCE AND TECHNOLOGY
2015年
5期
47-52
,共6页
SPOT-VGT NDVI%气候因子%偏差%标准差%时空变化
SPOT-VGT NDVI%氣候因子%偏差%標準差%時空變化
SPOT-VGT NDVI%기후인자%편차%표준차%시공변화
SPOT-VGT NDVI%climatic factors%deviation%standard deviation%spatial and temporal change
利用1998-2012年生长季的SPOT-VGT NDVI数据集和气温降水数据，应用最大值合成法、平均值法、一元线性回归分析法、相关系数、偏差和标准差，分析了河北省植被生长季NDVI的时空变化及与气候因子的关系。结果表明：1998-2012年15年间河北省植被生长季内NDVI值呈波动上升趋势，最小NDVI值为1999年的0.49，最大NDVI值为2012年的0.59。在每年的植被生长季内，6到7月NDVI增长最快，8月达到最大值0.70，9月NDVI开始下降。河北省NDVI空间分布呈现由中部向两边减少的趋势。植被生长季NDVI 15年平均最高值达0.77，出现在燕山山脉的雾灵山附近；最低值为0.01，出现在沧州东部沿海。1998-2012年间河北省植被生长季NDVI总体上呈现增加的趋势，NDVI减少的区域占9.16%，增加的区域90.84%。生长季平均NDVI与平均降水呈正相关，R2为0.7976；与平均气温呈负相关关系，R2为0.2076。1999-2002、2006-2007年生长季NDVI均值低于15年均值，其余年份均高于15年均值。张家口中部大部分地区、承德北部和东部一小部分、沧州东部大部分地区及衡水的中北部大部分地区植被覆盖变化程度较大，其中唐山是由于NDVI下降引起的植被覆盖变化程度较大，其它地区是由于NDVI上升。
利用1998-2012年生長季的SPOT-VGT NDVI數據集和氣溫降水數據，應用最大值閤成法、平均值法、一元線性迴歸分析法、相關繫數、偏差和標準差，分析瞭河北省植被生長季NDVI的時空變化及與氣候因子的關繫。結果錶明：1998-2012年15年間河北省植被生長季內NDVI值呈波動上升趨勢，最小NDVI值為1999年的0.49，最大NDVI值為2012年的0.59。在每年的植被生長季內，6到7月NDVI增長最快，8月達到最大值0.70，9月NDVI開始下降。河北省NDVI空間分佈呈現由中部嚮兩邊減少的趨勢。植被生長季NDVI 15年平均最高值達0.77，齣現在燕山山脈的霧靈山附近；最低值為0.01，齣現在滄州東部沿海。1998-2012年間河北省植被生長季NDVI總體上呈現增加的趨勢，NDVI減少的區域佔9.16%，增加的區域90.84%。生長季平均NDVI與平均降水呈正相關，R2為0.7976；與平均氣溫呈負相關關繫，R2為0.2076。1999-2002、2006-2007年生長季NDVI均值低于15年均值，其餘年份均高于15年均值。張傢口中部大部分地區、承德北部和東部一小部分、滄州東部大部分地區及衡水的中北部大部分地區植被覆蓋變化程度較大，其中唐山是由于NDVI下降引起的植被覆蓋變化程度較大，其它地區是由于NDVI上升。
이용1998-2012년생장계적SPOT-VGT NDVI수거집화기온강수수거，응용최대치합성법、평균치법、일원선성회귀분석법、상관계수、편차화표준차，분석료하북성식피생장계NDVI적시공변화급여기후인자적관계。결과표명：1998-2012년15년간하북성식피생장계내NDVI치정파동상승추세，최소NDVI치위1999년적0.49，최대NDVI치위2012년적0.59。재매년적식피생장계내，6도7월NDVI증장최쾌，8월체도최대치0.70，9월NDVI개시하강。하북성NDVI공간분포정현유중부향량변감소적추세。식피생장계NDVI 15년평균최고치체0.77，출현재연산산맥적무령산부근；최저치위0.01，출현재창주동부연해。1998-2012년간하북성식피생장계NDVI총체상정현증가적추세，NDVI감소적구역점9.16%，증가적구역90.84%。생장계평균NDVI여평균강수정정상관，R2위0.7976；여평균기온정부상관관계，R2위0.2076。1999-2002、2006-2007년생장계NDVI균치저우15년균치，기여년빈균고우15년균치。장가구중부대부분지구、승덕북부화동부일소부분、창주동부대부분지구급형수적중북부대부분지구식피복개변화정도교대，기중당산시유우NDVI하강인기적식피복개변화정도교대，기타지구시유우NDVI상승。
This paper used SPOT-VGT NDVI datasets and climatic data including air temperature and precipitation in growing seasons from 1998 to 2012 and the methods of maximum value composite (MVC), average, linear regression, deviation and standard deviation to analyze the spatial and temporal changes of NDVI and relationships with climatic factors The results showed that vegetation NDVI in growing seasons showed a trend of fluctuating increase from 1998 to 2012. The lowest annual average NDVI in growing seasons was 0.49 in 1999 and the highest was 0.59 in 2012. During growing seasons, NDVI increased quickly from June to July, reached the highest 0.70 in August and began to decrease in September. The spatial distribution of NDVI in Hebei Province presented the trend of decrease from the middle part to both sides. The highest average NDVI in growing seasons for these 15 years was 0.77, appeared near Wuling Mountain of Yanshan Mountains, the lowest NDVI was 0.01, appeared in eastern coast of Cangzhou region. NDVI in growing seasons showed an increasing trend in Hebei Province from 1998 to 2012, the area of NDVI decrease accounted for 9.16%, while that of NDVI increase accounted for 90.84%. The average NDVI was positively correlated to the average precipitation, the correlation coefficient was 0.7976, while negatively correlated to the average air temperature, and the correlation coefficient was 0.2076. The average NDVI in growing seasons in 1999-2002 and 2006-2007 were lower than the average of 15 years, and vise verse in other years. The degrees of vegetation cover change was high in the most parts of Middle Zhangjiakou region, a small part of North and East Chengde region, most parts of East Cangzhou region and Mid-North Hengshui region, the reasons are NDVI decrease in Tangshan and NDVI increase in other areas.
