Response of the cultivated land use structure to climate warming and drying in central Yunnan Plateau

doi:10.14088/j.cnki.issn0439-8114.2023.01.005

Abstract

Abstract: In order to study the impact of climate change on local cultivated land use patterns in central Yunnan Plateau,the regional irrigation water demand index of cultivated land use was constructed to quantitatively express the change characteristics of regional cultivated land planting structure and the response of regional cultivated land use structure to climate change. The results showed that the climate in the study area had a significant warming and drying trend, with an average warming rate of 0.35 ℃/10 a, an average precipitation decreasing rate of 79.15 mm/10 a, and an average decreasing rate of Kira dry-humidity index of 0.65/10 a from 1998 to 2019. At the same time, the regional cultivated land use structure showed a continuous trend of “drought”, and the proportion of crops with relatively small irrigation water requirements increased significantly, while the proportion of crops with relatively large irrigation water requirements decreased rapidly. Under the background of continuous increase of sown area, the index of irrigation water requirement of regional cultivated land utilization decreased continuously. The sown area of main crops and irrigation water demand index of regional cultivated land use were significantly correlated with mean annual temperatures, precipitation and Kira's humidity/aridity index. The response of regional cultivated land use structure to climate warming and drying was “drought”, and this response had a lag.

Key words: the regional irrigation water demand index, irrigation requirement, climate warming and drying, lag correlation coefficient, cumulative lag correlation coefficient, central Yunnan Plateau

CLC Number:

P967

TONG Shao-yu, ZHOU Yue, PENG Hai-ying. Response of the cultivated land use structure to climate warming and drying in central Yunnan Plateau[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(1): 23-30.

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