In general, the suitable distribution will increase in the future. In future (2061–2080) scenarios, the suitable distribution areas of Sinadoxa corydalifolia from high to low are as follows: RCP26 (18,299 km 2) > RCP60 (11,977 km 2) > RCP45 (10,354 km 2) > RCP80 (7539 km 2). In future (2041–2060) scenarios, the suitable distribution areas of Sinadoxa corydalifolia from high to low are as follows: representative concentration pathway (RCP)26 (6171 km 2) > RCP45 (6017 km 2) > RCP80 (4238 km 2) > RCP60 (2505 km 2). The highest suitable mean diurnal temperature (Bio2) ranged from 8.9 to 9.7 ☌. The highest suitable mean air temperature of the driest quarter ranged from −5 to 0 ☌. The highest suitability occurred when air temperature seasonality (Bio4) ranged from 6500 to 6900. The mean diurnal air temperature range (Bio2), temperature seasonality (Bio4), and mean air temperature of the driest quarter (Bio9) contributed the most to the distribution model for Sinadoxa corydalifolia, with a cumulative contribution of 81.4%. The suitable distribution area of Sinadoxa corydalifolia covered 3107 km 2, accounting for 0.57% of the three-river region. Under the current climate scenario, the suitable distribution mainly occurred in Yushu County and Nangqian County. In this study, we predicted the distribution of Sinadoxa corydalifolia in the three-river region (the source of the Yangtze River, Yellow River, and Lancang River) under the context of climate change using the maximum entropy (Ma圎nt) model. However, its distribution remains unclear. Sinadoxa corydalifolia is a perennial grass with considerable academic value as a rare species owing to habitat destruction and a narrow distribution.
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