Crops ›› 2021, Vol. 37 ›› Issue (2): 191-199.doi: 10.16035/j.issn.1001-7283.2021.02.028

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Analysis of Characteristics of Rice Drought in Guizhou Province Based on Water Deficit Index

Xing Yuan1(), He Zhonghua1,2   

  1. 1School of Geographic and Environmental Science (School of Karst Science), Guizhou Normal University, Guiyang 550001, Guizhou, China
    2State Engineering Technology Institute for Karst Desertification Control, Guizhou Normal University, Guiyang 550001, Guizhou, China
  • Received:2020-10-11 Revised:2020-12-24 Online:2021-04-15 Published:2021-04-16

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Abstract:

To explore the drought characteristics of rice growth periods in Guizhou province, this study analyzed various characteristics of the precipitation and water demand for different growth stages of rice in the rice planting regions of Guizhou province and the frequency distribution characteristics for the different drought levels, which is based on daily meteorological data of 31 weather stations by the Crop Water Deficit Index and combined with the collaborative kriging interpolation and trend analysis methods. The results showed that the precipitation in the rice growing periods increased in the east and decreased in the west with the cumulative precipitation values of transplanting-tillering stage>heading-ripening stage>sowing-seedling stage>jointing-booting stage, and the decreasing trend of precipitation in the sowing-seedling stages could cause the occurrence of drought. The cumulative water demand in different growth periods was the heading-ripening stage>transplanting-tillering stage>jointing-booting stage>sowing-seedling stage. The water requirement of rice in sowing-seedling periods was less than the precipitation in the same period, and the drought frequencies in the different levels were lower. The high frequency regions were observed in the Tongren area and the eastern parts of southeast Guizhou in the jointing-booting and heading-ripening stages.

Key words: Water deficit index, Drought characteristic, Rice, Collaborative kriging interpolation, Guizhou province

Fig.1

Overview of the study region and rice planting location"

Fig.2

Spatial characteristics of precipitation variation trend in each growing period of rice in Guizhou province"

Fig.3

Variation of average value of precipitation-water demand in rice planting regions of Guizhou province in each growth period"

Fig.4

Spatial characteristics of water demand in rice planting regions in each growing period in Guizhou province"

Table 1

Area statistics of drought frequency of different grades in each growing period of rice in Guizhou province km2"

干旱频率
Drought
frequency (%)		 播种-秧苗期Sowing-seedling stage 移栽-分蘖期Transplanting-tillering stage
轻旱
Light drought		 中旱
Moderate drought		 重旱
Heavy drought		 特旱
Extreme drought		 轻旱
Light drought		 中旱
Moderate drought		 重旱
Heavy drought		 特旱
Extreme drought
0~5 12.07 11.03 11.29 16.66 17.53 17.64 17.84 18.58
5~10 5.09 6.48 6.70 0.39 0.81 0.80 0.58 0.04
10~15 0.75 0.82 0.52 0.95 0.28 0.19 0.20 -
15~20 0.30 0.21 0.07 0.63 - - - -
20~30 0.40 0.09 0.05 0.01 - - - -
30~50 0.01 - - 0.00 - - - -
50~70 - - - - - - - -
70~100 - - - - - - - -
干旱频率
Drought
frequency (%)		 拔节-孕穗期Jointing-booting stage 抽穗-成熟期Heading-ripening stage
轻旱
Light drought		 中旱
Moderate drought		 重旱
Heavy drought		 特旱
Extreme drought		 轻旱
Light drought		 中旱
Moderate drought		 重旱
Heavy drought		 特旱
Extreme drought
0~5 11.77 10.93 6.30 - 5.61 1.82 0.73 0.00
5~10 4.88 5.37 6.16 - 7.71 6.52 4.53 0.43
10~15 1.59 1.71 4.18 - 3.51 5.26 2.87 3.60
15~20 0.32 0.60 1.62 - 1.46 4.35 3.36 2.85
20~30 0.06 0.01 0.36 - 0.33 0.67 6.03 7.80
30~50 - - - 0.22 - - 1.12 3.94
50~70 - - - 2.37 - - - -
70~100 - - - 16.03 - - - -

Fig.5

Spatial characteristics of drought intensity and frequency of different grades in sowing-seedling period of rice growing regions in Guizhou province"

Fig.6

Spatial characteristics of drought intensity and frequency of different grades in transplanting-tillering period of rice growing areas in Guizhou province"

Fig.7

Spatial characteristics of drought intensity and frequency of different grades in jointing-booting period of rice growing areas in Guizhou province"

Fig.8

Spatial characteristics of drought intensity and frequency of different grades in heading-ripening period of rice growing areas in Guizhou province"

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