The Response Characteristics of Xilingol Grassland to Uneven Distribution of_edit.pdf Received 26 September 2016 Accepted 11 October 2016 The Response Characteristics of Xilingol Grassland to Uneven Distribution of Precipitation at Temporal and Spatial Scale Qiaofeng Zhang1,2,3,4, Hongbo Yu1,3, Guixiang Liu2, Yuhai Bao1,3 1College of Geographical Science, Inner Mongolia Normal University, Hohhot 010022, China 2Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Hohhot 010022, China 3Inner Mongolia Key Laboratory of Remote Sensing and Geography Information System, Hohhot 010022, China 4Inner Mongolia Laboratory of Disaster Prevention and Reduction and Ecological Safety Monitoring, Hohhot 010022, China Abstract Precipitation is the most important source of water supply, which has important significance on the vegetation growth, also is an important factor affecting the drought severity in Xilingol grassland. Based on the precipitation of 15 weather stations and MODIS MOD13A3 NDVI data, Pearson correlation analysis was used to analysis the response characteristics of NDVI to precipitation at spatial and temporal scale. Results showed that from one month view, vegetation growth was the highest correlation with the precipitation of this month from May to July, but August and September were the highest correlation with the precipitation in July. Accumulated month view, the accumulated precipitation in the last three months was very important to the vegetation growth, and snowfall in the winter of previous year played an important role in May of next year. Spatially, from one month view, Erenhot and Sonid Youqi desert steppe region were the highest correlation with the precipitation in two months before, the others were the highest correlation with the precipitation in one month before. Accumulated month view, Erenhot and Sonid Youqi were the highest correlation with the accumulated precipitation in the last four months, the others were the highest correlation with the accumulated precipitation in the last three months. Keywords: Precipitation, NDVI, Spatial and temporal distribution, Correlation. 1,2,3,4, 1,3, 2, 1,3 1. 010022 2. 010010 3. 010022 4. 010022 : 15 MODIS MOD13A3 NDVI Pearson NDVI 5~7 NDVI 8 9 NDVI 7 3 5 2 1 4 3 NDVI Journal of Risk Analysis and Crisis Response, Vol. 6, No. 4 (December 2016), 206-212 Published by Atlantis Press Copyright: the authors 206 Q.F. Zhang / The Response Characteristics of Xilingol Grassland 1. [1-3] [4-9] [7, 10, 11] [10, 12-14] [15] 20 50 [16, 17] [18, 19] NDVI NDVI NDVI 0.83 [20] 15 5~9 NDVI 10~12 5~9 5~9 NDVI 2. 2.1 111°09´ ~ 120°01´E 41°35´ ~ 46°46´N 200 ~ 350mm 150mm 400mm 6~8 70% 0 ~ 3 3.5 ~ 4m/s 24 ~ 28m/s 34m/s 2800h 3000h 1 1. Fig.1 Vegetation zone and weather station in the study area 2.2 2.2.1 15 1 1999~2014 NASA MODIS MOD13A3 2000 ~ 2014 1Km Published by Atlantis Press Copyright: the authors 207 Q.F. Zhang / The Response Characteristics of Xilingol Grassland 15 2000~2014 5~9 3×3 5~9 225 15×15×1 NDVI 15 1999~2014 NDVI 5~9 NDVI 10~12 15 2000~2014 5~9 3×3 75 1 ×15 ×5 1125 15 ×15 ×5 NDVI 15 1999~2014 NDVI 5~9 NDVI 2.2.2 Pearson Pearson r 1 2 2 x x y y r x x y y 1 1 r [-1 1] r<0 r=0 r>0 0<|r|<0.4 0.4 0.7r 0.7 1r NDVI Pearson 3. 3.1 1 5 NDVI 5 4 10 0.45 0.42 0.42 5 NDVI 3 2 1 12 11 6 NDVI 6 4 10 0.47 0.45 0.43 7 NDVI 7 6 0.50 0.49 7 NDVI 3 2 1 12 11 8 NDVI 7 6 0.50 0.44 8 NDVI 7 9 NDVI 8 7 0.42 0.44 9 NDVI 7 Published by Atlantis Press Copyright: the authors 208 Q.F. Zhang / The Response Characteristics of Xilingol Grassland 1. NDVI 5~9 Pearson Table1 Correlation coefficient between NDVI from May to September and precipitation of each month Pearson NDVI 5 6 7 8 9 9 0.36578 8 0.3649 0.42381 7 0.49606 0.49619 0.43705 6 0.46948 0.48685 0.4419 0.39962 5 0.45178 0.36983 0.30096 0.24274 0.23455 4 0.41644 0.45427 0.38186 0.35761 0.35163 3 0.19392 0.23587 0.21549 0.26482 0.24823 2 0.24098 0.21147 0.22335 0.22501 0.19188 1 0.15233 0.14655 0.16068 0.14788 0.14105 12 0.21159 0.26173 0.28769 0.22474 0.19806 11 0.09282(P=0.1653) 0.19627 0.15535 0.15441 0.1512 10 0.42484 0.42556 0.38521 0.35878 0.34042 P P < 0.05 2 3 6~9 0.66 0.64 0.64 0.62 3 5 10 0.65 2. NDVI Fig.2 Pearson correlation coefficient between monthly NDVI and cumulative precipitation 3 0.58 5 5 6 7 8 9 7 7 7 8 9 4~10 3 2 1 12 11 4~10 11~3 6~9 3 Published by Atlantis Press Copyright: the authors 209 Q.F. Zhang / The Response Characteristics of Xilingol Grassland 3 5 10 3 5 5~9 4~7 5 3.2 5~9 NDVI 3 - 1~2 5 0 2 1 3. NDVI Fig.3 Correlation coefficient between mean NDVI of growing season and monthly precipitation 5~9 NDVI 4 NDVI 0 - - 4 3 8 8 2 1 4 3 Published by Atlantis Press Copyright: the authors 210 Q.F. Zhang / The Response Characteristics of Xilingol Grassland 4. Fig.4 Pearson correlation coefficient between NDVI of growing seasonand cumulative precipitation 4. 1 5~7 8~9 7 3 5 2 2 1 4 3 2013BAK05B01 ” CAAS-ASTIP-IGR2015-04 Email liugx804@163.com. [1] . 1982~1999 . . 2007, 62(1): 41-51. [2] . 1982-1999 . . 2003, 58(1): 119-125. [3] Chen X, Hu B. Spatial and temporal variation of phenological growing season and climate change impacts in temperate eastern China. Global Change Biology. 2005, 11(7): 1118-1130. [4] . 1961—2009 . . 2011(01): 22-24. [5] . 1961—2010 . . 2012(03): 7-9. [6] . 1961-2010 . . 2015(03): 135-136. [7] . 50 . ( ). 2011(03): 157-160. [8] . . . 2011(10): 126-130. [9] . . . 2011, 31(24): 7511-7515. [10] . . . 2011(05): 789-794. Published by Atlantis Press Copyright: the authors 211 Q.F. Zhang / The Response Characteristics of Xilingol Grassland [11] . . . 2012(06): 24-27. [12] . . . 2010(05): 46-49. [13] . . ( ). 2011(03): 304-310. [14] . . . 2010(23): 6538-6545. [15] . . . 2015(05): 119-128. [16] . 10a . . 2014(05): 1-9. [17] . . . 2006(02): 268-277. [18] . . , 2009. [19] . . . 2011(05): 789-794. [20] . 2000-2010 . . 2014(06): 1194-1204. 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