草地学报

草地学报 ›› 2017, Vol. 25 ›› Issue (2): 387-394.DOI: 10.11733/j.issn.1007-0435.2017.02.024

• 技术研发 • 上一篇    下一篇

近30年山丹天然草原面积及盖度变化

俞慧云1, 俞联平1, 史静2, 陈本建3   

  1. 1. 甘肃省草原技术推广总站, 甘肃 兰州 730010;
    2. 广西壮族自治区畜牧研究所, 广西, 南宁 530001;
    3. 甘肃农业大学草业学院, 甘肃 兰州 730070
  • 出版日期:2017-04-15 发布日期:2017-06-25
  • 作者简介:俞慧云(1990-),女,甘肃古浪人,硕士,研究方向为草学,E-mail:306729672@qq.com
  • 基金资助:

    甘肃省第二次草原资源普查子项"草原资源调查技术集成与应用（gcz201501）"资助

Change Analysis of Grassland Area and Vegetation Coverage of Shandan Nearly 30 Years

YU Hui-yun1, YU Lian-ping1, SHI Jing2, CHEN Ben-jian3   

  1. 1. Grassland Technical Extension Station of Gansu Province, Lanzhou, Gansu Province 730010, China;
    2. Guangxi Institute of Animal Science, Nanning, Guangxi Province 53001, China;
    3. Grassland Industry College, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
  • Online:2017-04-15 Published:2017-06-25

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摘要：

本研究将3S技术与地面调查相结合，选择决策树分类和像元二分模型等方法，对山丹草原资源和草地植被盖度现状及变化进行了研究与评价。结果表明：研究区草原总面积39.59万hm2，其中高寒草甸、山地草甸、温性草原、温性荒漠和温性草原化荒漠分别为8.47，3.14，9.61，8.23和10.14万hm2；2014年研究区草原总面积比1987年减少了2.59万hm2，山地草甸、温性草原、温性草原化荒漠和温性荒漠分别减少了8592.75，2377.08，3357.69和11559.75 hm2。各类型草地平均盖度依山地草甸、高寒草甸、温性草原、温性草原化荒漠和温性荒漠次序降低，分别为82.35%，57.60%，33.79%，17.07%和9.94%，正常年份分别以Ⅱ，Ⅰ，Ⅳ，V和V级草地盖度为主；从1987年到2014年，山地草甸盖度呈现逐年降低的趋势，高寒草甸呈先上升后下降趋势，温性草原、温性草原化荒漠和温性荒漠呈先下降后上升趋势。

关键词: 山丹, 决策树分类, 像元二分模型, 草原资源, 植被盖度

Abstract:

Combining "3S" technology with ground survey in this research, we evaluated present situation and change analysis of grassland resource and vegetation coverage by decision tree classification and dimidiate pixel model. The results showed that the total grassland area of study area was 395900 hm2 in 2014, which decreased 25900 hm2 compared with the year 1987. The grassland area of alpine meadow, mountain meadow, temperate steppe, temperate desert and temperate steppe-desert were 84700, 31400, 96100, 82300 and 101400 hm2, respectively. Mountain meadow, temperate steppe, temperate steppe-desert and temperate desert were decreased by 8592.75, 2377.08, 3357.69 and 11559.75 hm2. The average coverage of mountain meadow, alpine meadow, temperate steppe, temperate steppe-desert and temperate desert were 82.35%, 57.60%, 33.79%, 17.07% and 9.94% respectively.The vegetation coverage grades were Ⅱ, Ⅰ, Ⅳ, V and V mainly in normal years. The coverage of mountain meadow decreased year by year, and the alpine meadow increased firstly and then decreased, but the temperate steppe, temperate steppe-desert and temperate desert decreased firstly and then increased from 1987 to 2014.

Key words: Shandan, Decision tree classification, Dimidiate pixel model, Grassland area, Vegetation coverage

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