Semi-natural areas of Tarim Basin in northwest China: Linkage to desertification
Semi-natural areas of Tarim Basin in northwest China: Linkage to desertification
复制标题
中国西北塔里木盆地半自然地区：与荒漠化的联系
DOI：
10.1016/j.scitotenv.2016.07.180
复制
发表时间：
2016-12-15
影响因子：
9.8
通讯作者：
Xiao, Xiangming
中科院分区：
文献类型：
--
作者：
Liu, Fang;Zhang, Hongqi;Xiao, Xiangming
半自然土地不是集约化经营的土地，在保护人工绿洲和防治干旱地区荒漠化方面具有生态意义。在土地利用集约化过程中，半自然土地的严重萎缩和退化造成了严重的荒漠化。然而，在半自然土地的时空格局和详细分类及其与荒漠化的数量关系方面存在知识差距。以塔里木盆地为例，利用大比例尺多源数据集，分别在1990年、2000年和2010年建立了半自然土地综合分类体系。然后，以十年为间隔的地图比较来表征半自然土地的时空变化。最后，以241个流域为例，探讨了半自然土地与荒漠化之间的统计关系。2010年塔里木盆地半自然土地面积为10.77×10(4)km2，其中荒漠植被型、天然绿洲型、人工绿洲型、盐碱型和湿地型分别占总面积的59.59%、14.65%、11.25%、9.63%和4.88%。从1990年到2010年，半自然土地迅速减少(9769.05千米)。在脆弱的流域中，半自然土地主要转化为荒漠；而在绿洲农业发达的流域中，人工绿洲类型的退耕还田是主要变化。沙漠化的发生与半自然土地的类型、面积比例和组合方式密切相关。荒漠植被类型和盐碱地类型较多的地区易发生荒漠化，人工绿洲类型和湿地类型所占比例较高的地区荒漠化程度较轻。鼓励政策干预和水资源合理配置，防止半自然土地，特别是限水流域和限水时期的土地大量流失。(C)2016爱思唯尔B.V.保留所有权利。
Semi-natural lands are not intensively managed lands, which have ecological significance in protecting artificial oasis and preventing desertification in arid regions. The significant shrinkage and degradation of semi-natural lands in the land-use intensification process have caused severe desertification. However, there is a knowledge gap regarding the spatio-temporal pattern and detailed classification of semi-natural lands and its quantitative relationship with desertification. Taking the Tarim Basin as an example, we proposed a comprehensive classification system to identify semi-natural lands for 1990, 2000, and 2010, respectively, using multi-source datasets at large scales. Spatio-temporal changes of semi-natural lands were then characterized by map comparisons at decade intervals. Finally, statistical relationships between semi-natural lands and desertification were explored based on 241 watersheds. The area of semi-natural lands in Tarim Basin was 10.77 x 10(4) km(2) in 2010, and desert-vegetation type, native-oasis type, artificial-oasis type, saline type and wetland type accounted for 59.59%, 14.65%, 11.25%, 9.63% and 4.88% of the total area, respectively. A rapid loss of semi-natural lands (9769.05 km(2)) was demonstrated from 1990 to 2010. In the fragile watersheds, the semi-natural lands were mainly converted to desert; while in the watersheds with advanced oasis agriculture, artificial-oasis type reclaimed to arable land was the major change. The occurrence of desertification was closely related to the type, area proportion and combination patterns of semi-natural lands. Desertification was prone to occur in regions abundant in desert-vegetation type and saline type, while less serious desertification was observed in regions with high proportion of artificial-oasis type and wetland type. Policy intervention and reasonable water resource allocation were encouraged to prevent the substantial loss of semi-natural lands, especially for the water-limiting watersheds and periods. (C) 2016 Elsevier B.V. All rights reserved.