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Scientia Silvae Sinicae ›› 2019, Vol. 55 ›› Issue (12): 133-139.doi: 10.11707/j.1001-7488.20191214

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Identification of Potential Distribution Area for Populus euphratica by the MaxEnt Ecologic Niche Model

Jingwen Li1,Hao Guo1,*,Yusheng Wang2,Zhiming Xin1,3,Yongjun Lü3   

  1. 1. Institute of Desertification Studies, CAF Beijing 100091
    2. College of Geography and Environment, Shandong Normal University Jinan 250358
    3. Experimental Center of Desert Forestry, CAF Dengkou 015200
  • Received:2018-02-01 Online:2019-12-25 Published:2020-01-02
  • Contact: Hao Guo
  • Supported by:
    国家重点研发计划(2016YFC0501004);国家自然基金委青年科学基金项目(31600581)

Abstract:

Objectve: The MaxEnt ecologic niche model was used to predict the potential distribution area of Populus euphratica, in order to determine the potential distribution area of P. euphratica in China, and provide scientific basis for the introducing, cultivating technology, protection, utilization, and sustainable management of P. euphratica resources. Method: Through the literature search, database search, and field investigation, the distribution site information of P. euphratica was obtained. According to the environmental characteristics of the growing area of P. euphratica and its growth characteristics, 29 environmental factors were selected, including climatic, soil, and topographic factors. Main limiting factors for the P. euphratica distribution were determined by using multiple combination, and consequently the potential distribution areas of P. euphratica in China were identified. Meanwhile, using the receiver operating characteristic curve, the model precision was tested. Result: The result showed that the total potential distribution area of P. euphratica in China was 1.328 3 million km2, accounting for 14.8% of the total land area of China. The potential distribution areas were Xinjiang Uygur Autonomous Region, Inner Mongolia Autonomous Region, Gansu Province, and Ningxia Hui Autonomous Region. The optimum distribution areas were Central South Xinjiang and the Ejina Basin of west Inner Mongolia, with a total area of 231 200 km2, accounting for 2.4% of the total land area of China. Among them, the optimum distribution area in Xinjiang is 224 200 km2, accounting for 96% of the total optimum distribution in China. The main environmental factors affecting P. euphratica potential distribution are the precipitation of the wettest month, altitude, annual precipitation, annual mean temperature, temperature annual range, temperature seasonality. Conclusion: The optimum distribution areas of P. euphratica require the climatic conditions of mean annual air temperature of 9.4-11℃, an extreme high air temperature of 39.2-44℃, an extreme low air temperature of-17—-25℃, the annual precipitation of 32.9-43.7 mm, and the soil pH-values of 7.9-8.5 as well as the altitude around 1 000 m.The result can be used to determine the suitable areas for the introduction and cultivation of P. euphratica to avoid the losses of human labor, material and financial resources due to improper decision, and to provide a scientific basis for the future introduction, cultivation and management of P. euphratica.

Key words: Populus euphratica, MaxEnt model, environmental variables, suitable area, potential distribution, habitat suitability assessment, identification

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