• 气候与环境变化 •

### 东亚干旱半干旱区沙漠化与气候变化相互影响研究进展

1. 1. 中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室, 兰州 730000;
2. 中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室, 北京 100101
• 收稿日期:2013-12-01 修回日期:2014-02-01 出版日期:2014-06-25 发布日期:2014-06-25
• 通讯作者: 王训明（1970- ），男，安徽安庆人，研究员，博导，主要从事沙漠化与干旱区环境演变研究，E-mail：xunming@igsnrr.ac.cn。 E-mail:xunming@igsnrr.ac.cn
• 作者简介:花婷（1987- ），女，宁夏灵武人，助理研究员，主要从事沙漠化演变与气候变化方面的研究，E-mail：hactgexin@lzb.ac.cn。
• 基金资助:
国家自然科学基金项目（41225001）；国家重大科学研究计划项目（2013CB956003）。

### Research progresses on the interaction between desertification and climate change in arid and semiarid East Asia

HUATing1, WANG Xunming2

1. 1. Key Laboratory of Desert and Desertification, Cold & Arid Regions Environmental & Engineering Research Institute, CAS, Lanzhou 730000, China;
2. Key Laboratory ofWater Cycle & Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China
• Received:2013-12-01 Revised:2014-02-01 Online:2014-06-25 Published:2014-06-25

Abstract: Interactions between climate change and land surface processes, especially in arid and semiarid areas, have received increasing attention in recent years from climate scientists and geographers globally. In this paper, progresses in existing research on the interaction between desertification and the climate system in arid, semiarid, and semi-humid East Asia are outlined and discussed. Although there are large regional differences, the climate system affects regional desertification process by altering temperature, precipitation, wind field, and other meteorological factors. The current findings indicate that precipitation has a relative explicit impact on desertification: increases in precipitation are beneficial for vegetation growth and the reversal of desertification, and decreases in precipitation may result in increased desertification. Comparatively, the influences of temperature and wind field on desertification are more complicated and differ among various subregions: in the eastern monsoonal area, rises in temperature and the upper dominant southwest wind may be accompanied by increases in precipitation, contributing to reversals of desertification; in the western non-monsoonal area, rises in temperature promote increases in both surface evaporation and river runoff as a result of enhanced glacier thawing and snow melting, thus it is uncertain how this temperature change affects desertification; in the higher latitudes and altitudes, droughts and frost disasters often act together and give rise to severe damages to regional ecosystem, triggering increased desertification. On the other hand, desertification to some extent affects the local climate system by altering the characteristics of vegetation, land surface and soil. Increased desertification leads to vegetation degradation and subsequently changes in surface albedo, latent heat flux, as well as surface roughness height, which may in turn alter temperature, probabilities of precipitation events, and the wind regimes of local areas. Desertification also leads to the release of higher amount of fine particulates into the atmosphere, which may negatively affect the occurrence of precipitation. Overall, the interactions between desertification and the climate system include many feedbacks, among which the positive albedo-temperature-vegetation feedback and the positive sand-dust-precipitation-vegetation feedback are the principal mechanisms. Despite considerable progresses made in existing research, however, there remain many important issues that are yet to be addressed or difficult to address, such as the spatial and temporal aspects of processes involved in desertification, which are critical for understanding the interactions between climate change and desertification, and thus further studies are needed in the future.

• P941