The Spatiotemporal Characteristics and Responses to Climate Warming of Thermophilic Crops in Chinese Oases between 1960 and 2016
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Chen Lihong, Liu Puxing
Crop growth is an important controlling factor for vegetation ecosystem function, and is regarded as the “best indicator” of climate change response. The research on the response and adaptation to climate change has important theoretical and practical significance for crops adapt to global changes, mitigate disaster losses and promote grain income. Therefore, based on the daily average temperature data from 67 meteorological stations in Chinese oases that are within the distribution area of Thermophilic crops, this paper analyzed to determine the spatiotemporal responses of the start and end dates and growing period of crops to climate change. Using the multi-year trend line, inverse distance weighted interpolation (IDW) in the software ArcGIS, a Morlet wavelet power spectrum, correlation analysis and unary regression analysis. The results show that, in the past 57 years, the oasis Thermotropic crops in China have been characterized by advanced the start date, postponed the end date, and gradually increased the number of days that comprise the growing period. The changing trend rates recovered in this analysis for these three time slices are -1.44d/10a, 1.48d/10a, and 2.92d/10a (α≥0.001), respectively. The extension of the growth period is the most prominent, the correlation coefficient is as high as 0.676, but each oasis is different. Data show that spatial disparity of Thermophilic crops is extremely significant. From the southwest to the northeast of Chinese oases, having the characteristics that the start date is postponed, the end date is advanced, the growing period is shortened. There are 2.4a, 3.5a and 2.5a, 3.8a dominant short cycles at the start and end dates and growing period of Thermophilic crops, respectively. It is indicated that the Thermophilic crops may be affected mainly by atmospheric circulation (2-4 years). It is significantly correlated with the average temperature of April, October and April to October, the correlation coefficients are -0.963, 0.928 and 0.957 (α≥0.001).Thus, if the average temperature in April increases by 1℃, the start date will be advanced by 4.83 days, while if the average temperature in October increases by the same margin then the seasonal end date will be delayed by 4 days. Similarly, if the average temperature between April and October increases by 1℃, the growing period will be extended by 9.04 days. The results indicate that the variation of the growth period of Thermophilic crops in the study area is sensitive to the response of climate warming.
Chinese oases, Thermophilic crops, Growth period, Climate response