近30年山丹天然草原面积及盖度变化
发布时间：2018-08-12 07:47
【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hm~2,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hm~2;2014年研究区草原总面积比1987年减少了2.59万hm~2,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11559.75hm~2。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。
[Abstract]:In this study, the 3s technique was combined with the ground survey, and the decision tree classification and pixel dichotomy model were selected to study and evaluate the present situation and changes of vegetation coverage of Shandan steppe. The results showed that the total grassland area of the study area was 395900 hmm2, in which alpine meadow, mountain meadow, temperate steppe, temperate desert and temperate steppe desert were 8.47 ~ 3.149.61 ~ (8.23) and 101400 ~ (-1) h ~ (-1), respectively. The total grassland area of the study area in 2014 was 25900 mm ~ (-2) less than that of 1987, and that of mountain meadow. The temperate steppe, temperate steppe desert and temperate desert decreased by 8592.75 and 11559.75hmmm-2, respectively, and decreased by 2377.08c3357.69 and 11559.75hmm. The average coverage of each type of grassland decreased according to the order of mountain meadow, alpine meadow, temperate steppe desert and temperate desert, which were 82.35%, 57.60% and 33.79%, 17.07% and 9.94%, respectively. In normal year, the coverage of 鈪，
本文编号：2178398
[Abstract]:In this study, the 3s technique was combined with the ground survey, and the decision tree classification and pixel dichotomy model were selected to study and evaluate the present situation and changes of vegetation coverage of Shandan steppe. The results showed that the total grassland area of the study area was 395900 hmm2, in which alpine meadow, mountain meadow, temperate steppe, temperate desert and temperate steppe desert were 8.47 ~ 3.149.61 ~ (8.23) and 101400 ~ (-1) h ~ (-1), respectively. The total grassland area of the study area in 2014 was 25900 mm ~ (-2) less than that of 1987, and that of mountain meadow. The temperate steppe, temperate steppe desert and temperate desert decreased by 8592.75 and 11559.75hmmm-2, respectively, and decreased by 2377.08c3357.69 and 11559.75hmm. The average coverage of each type of grassland decreased according to the order of mountain meadow, alpine meadow, temperate steppe desert and temperate desert, which were 82.35%, 57.60% and 33.79%, 17.07% and 9.94%, respectively. In normal year, the coverage of 鈪，
本文编号：2178398
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