Journal of Geographical Sciences ›› 2021, Vol. 31 ›› Issue (10): 1490-1506.doi: 10.1007/s11442-021-1908-y
• Research Articles • Previous Articles Next Articles
LIU Zhilin(), DING Yinping, JIAO Yuanmei(
)
Received:
2021-01-18
Accepted:
2021-08-28
Online:
2021-10-25
Published:
2021-12-25
Contact:
JIAO Yuanmei
E-mail:zhilin2015@foxmail.com;ymjiao@sina.com
About author:
Liu Zhilin (1990-), PhD Candidate, specialized in the natural element, farmland, settlement landscape changes and their effects. E-mail: zhilin2015@foxmail.com
Supported by:
LIU Zhilin, DING Yinping, JIAO Yuanmei. Impact of changes in precipitation pattern on food supply in a monsoon interlacing area and its mechanism: A case study of Yunnan Province[J].Journal of Geographical Sciences, 2021, 31(10): 1490-1506.
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Table 1
Precipitation stages in Yunnan from 1988 to 2018
Stage | Time (years) | Annual precipitation (mm) | UF values | Precipitation characteristics |
---|---|---|---|---|
Stage I - abundant precipitation | 1988-2004 | 1129.88 | Continuous increase≥0 | Precipitation increase |
Stage II - reduced precipitation | 2005-2015 | 1055.51 | Continuous decrease, 2011-2015<0 | Precipitation decrease |
Stage III - recovery period | 2016-2018 | 1164.57 | Approaching from≤0 | Precipitation recovery |
Table 2
Precipitation change characteristics from 1988 to 2018
Time period | Change area (%) | Change region | Fit relationship y = ax+b | Rate of change (%) | |
---|---|---|---|---|---|
Increase | Decrease | ||||
Ⅰ vs. Ⅱ | 15.07 | Pu’er City, Xishuangbanna, Zhaotong City | Nujiang and Dehong prefectures | y = 0.95x-35 | -(82.5)+(17.5) |
Ⅱ vs. Ⅲ | 13.87 | Pu’er City, Xishuangbanna, Zhaotong City, Kunming, Yuxi City | Small parts of Dali and Diqing prefectures | y = 1.1x+36 | -(6.3)+(93.7) |
Ⅰ vs. Ⅲ | 16.53 | Pu’er City, Xishuangbanna, Kunming, Yuxi City, Nujiang Prefecture, Baoshan City, Dehong Prefecture, Lincang City | Diqing Prefecture and Qujing City | y = 1.0x-8.6 | -(49.2)+(50.8) |
Figure 5b
Spatial relationship between precipitation and grain yield in Yunnan shows that the smallest and the largest fluctuations in precipitation occurred in segments 175-200 and 0-25, respectively, implying that the precipitation gradually increased from the southeast to the northwest and became less stable. The reason for this is that the northwestern part of Yunnan is farther inland and is blocked by mountains, and therefore, the water-laden air masses of the SEM and SWM fail reaching there. The grain
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