| 摘要: |
| 基于TM/ETM遥感数据和FCD模型植被覆盖度反演方法反演中亚地区马雷绿洲1988、2001和2010年植被覆盖度,分析了马雷绿洲1988—2010年植被覆盖度的空间格局和时空变化规律,并结合该区域同时期年均温度和年降水量数据,分别从不同空间和时间尺度上分析了植被覆盖度和气候变化的响应。结果表明:1)马雷绿洲面积呈扩大趋势,植被覆盖度由绿洲内部向外围递减,变化速率为0.12/10 km,越趋近于绿洲边缘这种变化就越大;2)1988—2010年植被覆盖度总体呈上升趋势,1988—2001年增加尤为明显,平均为0.20/10年,2001—2010年趋于平缓,绿洲内部植被覆盖面积变化强烈、复杂及没有规律性,受人类活动影响较大,土地弃耕、撂荒现象十分严重;3)马雷绿洲植被覆盖度与降水和年均温度存在一定的相关性,与年降雨量、年均温度的平均相关系数分别为0.39和－0.33,其中绿洲内部植被覆盖度与年降水量和年均温度相关性较高,绿洲外围的荒漠地区相关性一般。 |
| 关键词: 植被覆盖度 气候因子 FCD模型 相关性 马雷绿洲 |
| DOI：10.11841/j.issn.1007-4333.2013.05.10 |
| 投稿时间：2013-03-04 |
| 基金项目:国家国际科技合作项目(2010DFA92720-12) |
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| Spatial differences of variations of vegetation coverage and the relationship with climatic factors in Bayramaly oasis |
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ZHANG Yan-jun, Tashpolat·Tiyip, DING Jian-li, ZHANG Fei, Mamat·Sawt
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| (College of Resources and Environment Science/Key Laboratory of Oasis Ecology of Ministry of Education, Xinjiang University, Urumqi 830045, China) |
| Abstract: |
| Global climate change has led to significant vegetation changes in the past half century.Vegetation fraction is a general and quantitative index related with vegetation growth,and it has many important applications in the water resources,land desertification,regional ecology and global change research.Central Asia,most of its land was located in arid areas,is undergoing a process of prominent warming and drying.It is necessary to investigate the response of vegetation to the climatic variations for a better understanding of the accumulated consequence of climate change.The authors selected Bayramaly oasis of Turkmenistan as a case study region,and used remote sensing data from the American Landsat TM/ETM data and FCD model,combining with the average annual temperature and annual precipitation data in the region and the same period to analyze the vegetation dynamics and the response of the climate change on different spatial and temporal scales.It was found that Bayramaly oasis has a tendency to expand,the vegetation coverage is decreasing to the periphery by the oasis,the rate of change is 0.12/10 km,and the more close to the oasis edge,the greater this change is.In 1988—2010,the overall vegetation coverage had an upward trend,and there was a particularly evident increase in 1988—2001 with the average of 0.20/10 a(vegetation coverage increased 0.2 per decade).It changed slowly during 2001—2010 and in the internal of the oasis,the vegetation covered an area of the intense change which had no regularity and was complicated by the impact of human activities and serious land abandonment.There is a certain correlation between vegetation coverage and climate,but not obviously,and the annual rainfall average correlation coefficient was 0.39 and the average temperature correlation coefficient was －0.33.The oasis vegetation coverage and annual precipitation and mean annual temperature were higher,the periphery of the oasis desert region was in general. |
| Key words: vegetation coverage climatic factors FCD model correlation Bayramaly oasis |
