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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (28): 75-82.doi: 10.11924/j.issn.1000-6850.casb2022-0813

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Analysis of Dry and Wet Climate Change Characteristics and Main Influencing Factors in Main Grain Producing Areas of Tibet from 1980 to 2021

ZHUJIE Sangbu1(), ZHANG Cunjie2(), ZHAXI Puchi3, BAIMA Deji1, NIMA Lamu1, PINGCUO Ciwang4   

  1. 1 Nanmulin Meteorological Bureau of Tibet Autonomous Region, Shigatse, Tibet 857000
    2 National Climate Center, Beijing 100089
    3 Shigatse Agricultural Science Research and Promotion Center, Shigatse, Tibet 857000
    4 Dingri County Meteorological Bureau of Tibet Autonomous Region, Shigatse, Tibet 857000
  • Received:2022-09-20 Revised:2022-12-07 Online:2023-10-05 Published:2023-09-25

Abstract:

Based on the daily meteorological observation data of seven meteorological stations in southern Tibet from 1980 to 2021 (April-October), the temporal and spatial variation characteristics and influencing factors of dry and wet index (AI) in the growing season of major grain producing areas in Tibet were studied by using climate propensity rate, Mann-Kendal test, Morlet wavelet analysis, GIS hybrid interpolation method, Pearson correlation coefficient, contribution rate analysis and other methods. The results showed that the average AI in the main grain producing areas of Tibet was 1.7, which belonged to the semi-arid area, and the overall trend was decreasing (humidifying) (-0.036/10 a). The linear decreasing trend was different in different regions, and the area around Lazi County was the most significant (-0.26/10 a). AI had no obvious mutation, and had long and medium term oscillation characteristics of 24 a, 6 a. The spatial distribution was uneven, and had the characteristics of ‘shrinking the dry area and expanding the wet area’. the contribution rate of the main climate influencing factors of AI varied in different regions. In general, the contribution degree after quantification was as follows: precipitation (34.9%)> relative humidity (28.4%)> sunshine (19.9%)> maximum temperature (12.4%).

Key words: Tibet, main production area, climate, dryness, contribution rate