Correlation between natural rubber yield and climate suitability in Hainan Island
The climate suitability index method was used to evaluate the climate suitability of rubber trees in Hainan Island,and the detrending cross-correlation analysis(DCCA)method was selected to analyze the correlation between rubber tree yield and climate suitability.The results showed that rubber tree yield in Hainan Island was lower in the east and west and the lowest value was 657.30 kg·hm-2 which appeared at Wenchang,and the highest value was 1376.54 kg·hm-2 in Sanya.Per unit area yield in the central part of Hainan Island had a small range of change,and in other areas showed a significant increase,with linear tendency rates generally exceeding 10 kg·hm-2·a-1.The central and eastern parts of Hainan Island had a relatively high level of comprehensive suitability,with suitability indexes exceeding 0.70,and a lower suitability level of 0.39 in the west.The temperature and sunshine duration suitability indexes were generally above 0.80 and 0.70,which had small differences in spatial.Precipitation suitability was higher in the central and eastern parts,and was lower in the western and southern parts,overall range from 0.42 to 0.77.The wind speed suitability index was more than 0.75 in the central and southern parts,and was lower in the western and northern parts,with the lowest being 0.18.The results of DCCA analysis showed that there was an obvious long-range correlation between climate suitability and rubber tree yield.The correlation level between precipitation and yield was the highest,and the wind speed was the lowest.Spatially,the correlation in east was weak,and the correlation in the west,north and south was slightly stronger.
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