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气候变化情景下大叶茶在云南省的潜在分布预测

Prediction of the potential distribution of Camellia sinensis var. assamica in Yunnan Province under climate change scenarios

  • 摘要: 大叶茶(Camellia sinensis var. assamica)是云南省茶产业的重要资源,明确其潜在适生区变化对产业布局与可持续发展有重要意义。基于96个大叶茶分布点和生物气候变量,利用MaxEnt模型预测当前及未来(2030s和2070s)不同气候情境(SSP1-2.6、SSP2-4.5、SSP3-7.0和SSP5-8.5)下大叶茶潜在云南省的潜在适生区。结果表明(1)模型预测的曲线下的面积为0.715,最湿月降水量(BOI13,48.3%)、最干季降水量(BIO17,15.8%)和温度季节性变化(BIO4,11.6%)和坡度(Slp,10.7%)是影响大叶茶分布的关键因子。(2)当前气候下大叶茶潜在适生区呈南多北少格局,高适生区集中分布于西双版纳、普洱、保山等地,面积约4.72 × 104 km2,占总适生面积的12.3%。(3)未来气候变化下大叶茶潜在适生区总体呈现向北扩张趋势,高适生区与适生区面积显著增加,质心由当前的双柏县向西北迁移至楚雄市境内。(4)SSP3-7.0情景下高适生区面积增幅异常显著,适生区北移使保山、楚雄和大理等区域成为潜在种植区。本研究可为优化大叶茶种植布局及制定管理策略提供科学依据。

     

    Abstract: Camellia sinensis is a crucial resource for the tea industry in Yunnan Province. Understanding changes in its potential suitable habitat is of great significance for industrial layout and sustainable development. This study, based on 96 occurrence points and bioclimatic variables, utilized the MaxEnt model to predict the potential suitable habitats for this variety in Yunnan under current conditions and future climate scenarios (2030s and 2070s, including SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5). The results show that (1) The model's prediction accuracy, measured by the area under the curve (AUC), was 0.715. Key factors influencing its distribution include precipitation of the wettest month (BIO13, 48.3%), precipitation of the driest quarter (BIO17, 15.8%), temperature seasonality (BIO4, 11.6%), and slope (10.7%). (2) Under current climate conditions, suitable habitats show a pattern of "more in the south, less in the north," with highly suitable areas concentrated in Xishuangbanna, Pu'er, and Baoshan, covering approximately 4.72 ×104 km2, accounting for 12.3% of the total suitable area. (3) Under future climate change, suitable habitats generally exhibit a northward expansion trend, with significant increases in both highly suitable and moderately suitable areas. The centroid shifts northwest from the current Shuangbai County to Chuxiong City. (4) Under the SSP3-7.0 scenario, the expansion of highly suitable areas is particularly notable, and the northward shift of suitable habitats makes regions such as Baoshan, Chuxiong, and Dali potential cultivation zones. This study provides a scientific basis for optimizing the cultivation layout and developing management strategies for this tea variety.

     

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