Biodiversity Science ›› 2018, Vol. 26 ›› Issue (2): 138-148.doi: 10.17520/biods.2017188

• Orginal Article • Previous Article     Next Article

Identifying priority areas for grassland endangered plant species in the Sanjiangyuan Nature Reserve based on the MaxEnt model

Xiaoyu Wu1, 2, Shikui Dong1, *(), Shiliang Liu1, Quanru Liu3, Yuhui Han1, Xiaolei Zhang1, Xukun Su1, Haidi Zhao1, Jing Feng1   

  1. 1 School of Environment, Beijing Normal University, Beijing 100875
    2 Beijing Qiaonyu Foundation, Beijing 100015
    3 College of Life Sciences, Beijing Normal University, Beijing 100875
  • Received:2017-06-26 Accepted:2017-12-01 Online:2018-05-05
  • Dong Shikui
  • About author:

    # Co-first authors

Located in southern Qinghai Province in China, Sanjiangyuan is the source area for the Yangtze River, Yellow River, and Lancang River, and a worldwide biodiversity hotspot. Sanjiangyuan was degraded through human disturbance and climate change, which has led to a dramatic loss of the biodiversity of rangeland resources. We conducted field surveys based on species coordinates during 2014 and 2015. We used the MaxEnt model to predict distribution of 40 endangered plant species in Sanjiangyuan using the species coordinate data and bioclimatic data collected from the WorldClim database. From this, we obtained hotspots of endangered plant species in Sanjiangyuan under current and future climatic conditions. Results showed that hotspot areas of endangered plant species in Sanjiangyuan estimated using the MaxEnt model were approximately 89,438 km2, and mainly located in the east and south of the reserve. Among these hotspots, those that included more than 30 endangered plant species totalled 485 km2, and were mainly found in Nangqian County, Yushu City, Banma County, Jiuzhi County, and Henan County. The climate will become warmer and wetter in Sanjiangyuan in the future, which would benefit biodiversity and expand hotspot areas to the northwest. However, problems associated with planning the reserve remain. Nearly 4,423 km2 of hotspot areas have not been protected in the key reserve, including in Nangqian County, Yushu City, Banma County, Jiuzhi County, and Henan County. In these areas grazing is permitted, which might lead to human disturbances. We suggest policy makers focus more attention on these areas and increase conservation efforts.

Key words: biodiversity, climate change, prior conservation area, MaxEnt model

Fig. 1

The location of the collected sampling points of the endangered plant species in Sanjiangyuan Nature Reserve"

Table 1

19 bioclimatic variables and their descriptions"

变量 Variable 描述 Description
Bio1 年均温 Annual mean temperature
Bio2 平均温度日较差 Mean diurnal temperature range
Bio3 等温性 Isothermality
Bio4 温度季度变化 Temperature seasonality
Bio5 最热月最高温 Max temperature of warmest month
Bio6 最冷月最低温 Min temperature of coldest month
Bio7 年温度变化范围 Temperature annual range
Bio8 最湿季度均温 Mean temperature of wettest quarter
Bio9 最干季度均温 Mean temperature of driest quarter
Bio10 最暖季度均温 Mean temperature of warmest quarter
Bio11 最冷季度均温 Mean temperature of coldest quarter
Bio12 年平均降水量 Annual precipitation
Bio13 最湿月降水量 Precipitation of wettest month
Bio14 最干月降水量 Precipitation of driest month
Bio15 降水量变异系数 Precipitation seasonality
(coefficient of variation)
Bio16 最湿季度降水量 Precipitation of wettest quarter
Bio17 最干季度降水量 Precipitation of driest quarter
Bio18 最暖季度降水量 Precipitation of warmest quarter
Bio19 最冷季度降水量 Precipitation of coldest quarter

Table 2

The AUC value of predicted distribution of endangered plant species in Sanjiangyuan Nature Reserve based on MaxEnt model"

物种 Species AUC值 AUC value 物种 Species AUC值 AUC value
褐紫乌头 Aconitum brunneum 0.969 广布红门兰 Orchis chusua 0.910
八宿雪灵芝 Arenaria baxoiensis 0.969 宽叶红门兰 Orchis latifolia 0.919
三刺草 Aristida triseta 0.978 河北红门兰 Orchis tschiliensis 0.995
华雀麦 Bromus sinensis 0.962 青海固沙草 Orinus kokonorica 0.982
凹舌兰 Coeloglossum viride 0.948 川赤芍 Paeonia veitchii 1.000
毛杓兰 Cypripedium franchetii 0.997 羽叶点地梅 Pomatosace filicula 0.833
黑紫披碱草 Elymus atratus 0.867 小丛红景天 Rhodiola dumulosa 0.992
短芒披碱草 Elymus breviaristatus 0.884 喜马红景天 Rhodiola himalensis 0.876
矮麻黄 Ephedra minuta 0.930 圆丛红景天 Rhodiola juparensis 0.830
单子麻黄 Ephedra monosperma 0.839 狭叶红景天 Rhodiola kirilowii 0.911
中华羊茅 Festuca sinensis 0.915 四裂红景天 Rhodiola quadrifida 0.844
南山龙胆 Gentiana grumii 0.880 粗茎红景天 Rhodiola wallichiana 0.844
西南手参 Gymnadenia orchidis 0.942 短颖鹅观草 Roegneria breviglumis 0.906
落地金钱 Habenaria aitchisonii 0.981 短柄鹅观草 Roegneria brevipes 0.953
裂瓣角盘兰 Herminium alaschanicum 0.984 青海鹅观草 Roegneria kokonorica 0.980
角盘兰 Herminium monorchis 0.981 云状雪兔子 Saussurea aster 0.818
沼兰 Malaxis monophyllos 0.983 苞叶雪莲 Saussurea obvallata 0.927
红花绿绒蒿 Meconopsis punicea 0.921 红叶雪兔子 Saussurea paxiana 0.855
颈果草 Metaeritrichium microuloides 0.873 羌塘雪兔子 Saussurea wellbyi 0.916
羌活 Notopterygium incisum 0.940 华福花 Sinadoxa corydalifolia 0.993

Fig. 2

The probability graph of current distribution of the grassland endangered plant species in Sanjiangyuan Nature Reserve based on MaxEnt models. The species existing probability range from 0 to 1. Warmer colors show areas with higher predicted probability, red is the highest, followed by orange, yellow, green, cyan, light cyan and dark blue."

Fig. 3

The distribution graph of the grassland endangered plant species hotspots in Sanjiangyuan Nature Reserve"

Fig. 4

The distribution map of the grassland endangered plant species hotspots in Sanjiangyuan Nature Reserve under RCP2.6 of climate change in 2070"

Fig. 5

The protection situation of the grassland endangered plant species in Sanjiangyuan Nature Reserve"

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