2000-2018 年古尔班通古特沙漠植被覆盖度的时空变化特征提取
Alternative TitleSpatiotemporal Changes Characteristics of Vegetation Coverage in Gurbantunggut Desert from 2000 to 2018
Thesis Advisor吴世新
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline工程硕士
Keyword古尔班通古特沙漠 植被覆盖度 时空变化 Gurbantunggut Desert Vegetation coverage Spatiotemporal changes
Abstract本研究基于 2000-2018 年 MODIS EVI 数据提取了古尔班通古特沙漠的植被覆盖度, 并采用一元线性回归、 经验正交函数分解和变异系数分析古尔班通古特沙漠植被覆盖度的时空变化特征, 采用偏相关分析了植被覆盖度对气温和降水的响应, 结合短命植物的生长特点提取了短命植物生长状况的空间分布。 本研究为沙漠分类、制图和数据库的构建提供可靠的数据基础,并且对于沙漠的动态监测、保护及利用具有十分重要的意义。 研究结果表明:(1) 采用像元二分法估算植被覆盖度时, 基于野外实测数据与遥感数据相结合确定的参数估算出的植被覆盖度精度要优于基于累积频率 5%和 95%确定的参数估算出的植被覆盖度的精度。 2000-2018 年古尔班通古特沙漠植被覆盖度最高的区域分布在沙漠西南部, 沙漠南缘的植被覆盖度比沙漠腹地的植被覆盖度要高, 沙漠腹地的东西两侧植被覆盖度最低。(2) 2000-2018 年古尔班通古特沙漠不同沙漠类型的植被覆盖度均呈现显著增加的趋势(p<0.01), 整个古尔班通古特沙漠植被覆盖度的增长速率为 2.56%/10a, 这表明在 2000-2018 年间古尔班通古特沙漠的植被覆盖状况向好的趋势发展。 古尔班通古特沙漠固定沙丘的植被覆盖度最高, 半固定沙丘的植被覆盖度次之, 流动沙丘的植被覆盖度最低。(3) 古尔班通古特沙漠大部分区域(94.87%) 的植被覆盖度都呈上升的趋势, 仅有 5.13%区域的植被覆盖度呈降低趋势, 其中古尔班通古特沙漠植被覆盖度呈显著增加的区域占整个沙漠面积的比例为 26.01%(p<0.05) , 0.4%的区域植被覆盖度显著降低(p<0.05) 。 古尔班通古特沙漠植被覆盖度增加的区域主要在沙漠的西部、 南部、 中北部及东部, 减少的区域主要分布在沙漠的北部。 植被覆盖度上升趋势明显的区域主要集中在古尔班通古特沙漠靠近克拉玛依地区的西南部和沙漠南缘。(4) 古尔班通古特沙漠植被覆盖度的整体波动程度不大, 植被覆盖度波动程度较大的区域主要集中在古尔班通古特沙漠的西部、 东部及南部的边缘地区,而沙漠腹地植被覆盖度的稳定性较高。(5) 2000-2015 年古尔班通古特沙漠区域的年均温度和降水呈显著增加的趋势(p<0.05) , 有 66.46%区域的植被覆盖度与气温呈负相关, 主要分布在古尔班通古特沙漠的北部及西部, 有 33.64%区域的植被覆盖度与温度呈正相关,主要分布在古尔班通古特沙漠的南部及东部; 有 84.5%区域的植被覆盖度与降水呈正相关, 主要分布在古尔班通古特沙漠的西部和东部, 有 15.5%的区域与降水呈负相关, 主要分布在古尔班通古特沙漠的南部及北部。(6) 古尔班通古特沙漠中短命植物分布较多的区域主要分布在古尔班通古特沙漠的南部和中部, 北部次之, 沙漠的西部和东部较低。
Other AbstractBased on MODIS EVI data from 2000 to 2018, the vegetation coverage ofGurbantunggut Desert was extracted. The temporal and spatial variationcharacteristics of vegetation coverage in Gurbantunggut Desert were analyzed bylinear regression, empirical orthogonal function and coefficient of variation.Theresponse of vegetation coverage to temperature and precipitation was analyzed bypartial correlation, and the spatial distribution of growth status of ephemeral plantswas extracted by combining the growth characteristics of ephemeral plants.This studyprovides a reliable data base for desert classification, mapping and databaseconstruction, and is of great significance for the dynamic monitoring, protection andutilization of deserts.The results show that:(1) When using dimidiate pixel model to estimate vegetation coverage, theaccuracy of vegetation coverage estimation based on parameters determined bycombining field measured data with remote sensing data is better than that based onparameters determined by 5% and 95% cumulative frequency.From 2000 to 2018, thehighest vegetation coverage area in Gurbantunggut Desert is located in the southwestof the desert. The vegetation coverage in the southern edge of the desert is higher thanthat in the hinterland of the desert. The vegetation coverage in the eastern and westernsides of the hinterland of the desert is the lowest.(2) From 2000 to 2018, vegetation coverage of different desert types inGurbantungut Desert showed a significant increase trend (p < 0.01), and the growthrate of vegetation coverage in the whole Gurbantungut Desert was 2.56/10a, whichindicated that vegetation coverage in Gurbantungut Desert had a good trend in2000-2018.The vegetation coverage of the fixed dunes in the Gurbantunggut Desert isthe highest, the vegetation coverage of the semi-fixed dunes is second, and thevegetation coverage of the mobile dunes is the lowest.(3) The vegetation coverage in most areas of Gurbantunggut Desert (94.87%) showed an upward trend, while only 5.13% showed a downward trend.The proportionof vegetation coverage increased significantly in Gurbantunggut desert area was26.01% (p < 0.05).The proportion of vegetation coverage decreased significantly inGurbantunggut desert area was 0.4% (p < 0.05).The increased coverage of theGurbantunggut Desert is mainly in the western, southern, central and eastern parts ofthe desert, and the reduced areas are mainly distributed in the northern part of thedesert.The areas with obvious upward trend of vegetation cover mainly concentratedin the southwestern part of Gurbantunggut Desert near Karamay and the southernedge of the desert.(4) The overall fluctuation of vegetation coverage in Gurbantungut desert is notsignificant. The areas with large fluctuation of vegetation coverage are mainlyconcentrated in the western, Eastern and southern edges of Gurbantungut desert,while the stability of vegetation coverage in the hinterland of desert is higher.(5) The annual average temperature and precipitation in the GurbantunggutDesert increased significantly from 2000 to 2015 (p<0.05), and 66.46% of thevegetation coverage was negatively correlated with temperature, mainly distributed inthe north and west of Gurbantunggut desert, 33.64% of the vegetation coverage ispositively correlated with temperature, mainly in the south and east of theGurbantunggut Desert; 84.5% of the vegetation coverage is positively correlated withprecipitation, mainly Distributed in the west and east of Gurbantunggut Desert, 15.5%of the areas are negatively correlated with precipitation, mainly in the south and northof Gurbantunggut Desert.(6) The areas with more ephemeral plants in the Gurbantungut desert is mainlydistributed in the south and central part of the Gurbantungut desert, followed by thenorth, and lower in the west and east of the desert.
Subject Area测绘工程
Document Type学位论文
First Author Affilication中国科学院新疆生态与地理研究所
Recommended Citation
GB/T 7714
杨怡. 2000-2018 年古尔班通古特沙漠植被覆盖度的时空变化特征提取[D]. 北京. 中国科学院大学,2019.
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