【摘要】：本研究將3S技術(shù)與地面調(diào)查相結(jié)合,選擇決策樹分類和像元二分模型等方法,對(duì)山丹草原資源和草地植被蓋度現(xiàn)狀及變化進(jìn)行了研究與評(píng)價(jià)。結(jié)果表明:研究區(qū)草原總面積39.59萬hm~2,其中高寒草甸、山地草甸、溫性草原、溫性荒漠和溫性草原化荒漠分別為8.47,3.14,9.61,8.23和10.14萬hm~2;2014年研究區(qū)草原總面積比1987年減少了2.59萬hm~2,山地草甸、溫性草原、溫性草原化荒漠和溫性荒漠分別減少了8592.75,2377.08,3357.69和11559.75hm~2。各類型草地平均蓋度依山地草甸、高寒草甸、溫性草原、溫性草原化荒漠和溫性荒漠次序降低,分別為82.35%,57.60%,33.79%,17.07%和9.94%,正常年份分別以Ⅱ,Ⅰ,Ⅳ,V和V級(jí)草地蓋度為主;從1987年到2014年,山地草甸蓋度呈現(xiàn)逐年降低的趨勢(shì),高寒草甸呈先上升后下降趨勢(shì),溫性草原、溫性草原化荒漠和溫性荒漠呈先下降后上升趨勢(shì)。
[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，

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