| 引用本文: | 帅艳民，陈杨杨，邵聪颖，田艳君，曲歌，黄佳鹏.2024.东北三省地表覆被变化对太阳辐射吸收的影响[J].地球环境学报,15(4):675-690 |
| SHUAI Yanminsup>1, 2, 3, 4, CHEN Yangyang, SHAO Congying, TIAN Yanjun, QU Ge, HUANG Jiapeng.2024.Effect of ground cover changes on solar radiation absorption in Three Northeastern Provinces of China[J].Journal of Earth Environment,15(4):675-690 |
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| 摘要: |
| 太阳辐射是地表生态系统的主要能量来源，自然和人为因素造成的地表覆被变化是影响地表吸收太阳辐射的重要因素。选择我国纬度最高省际区域东北三省为研究区，基于2001、2005、2010、2015、2018年每年8月1日的MODIS地表覆被数据和地表吸收太阳辐射数据，对比分析不同地表覆被变化对地表吸收太阳辐射能量的影响。结果表明：（1）2001—2018年东北三省林地、水域先增后减，18 a间总量分别增加了3.96%和10.51%，耕地先减后增，总量减少1.22%，草地持续减少，总量下降19.36%，建筑用地逐期增长，总量增加11.08%。地表覆被变化以退耕还林还草、优化耕地格局、草地沙化、水利工程扩建、城市化扩张为主。（2）东北三省地表吸收太阳辐射强度为水域＞建筑用地＞林地＞草地＞耕地。变化剧烈区域（＞25 W∙m−2）主要集中在松嫩平原、三江平原及流经松嫩平原和三江平原的松花江流域。（3）地表覆被类型的转化会导致地表吸收太阳辐射的变化，以水域和耕草地、耕地和林草地之间转化时的变化最为显著。水域转化为耕草地时辐射吸收值均下降明显，反之上升，与耕地之间的绝对差异在2010—2015年最大（−156.66 W∙m−2），与草地之间在2005—2010年最大（102.36 W∙m−2）；林草地开垦辐射吸收值下降，反之上升，林地与耕地之间的绝对差异在2010—2015年林地转化为耕地时最大（−13.94 W∙m−2），草地与耕地之间则在2001—2005年耕地转化为草地时最大（22.36 W∙m−2）。 |
| 关键词: 地表覆被变化 地表吸收太阳辐射 东北三省 地表反照率 |
| DOI：10.7515/JEE222056 |
| CSTR：32259.14.JEE222056 |
| 分类号: |
| 基金项目:中国科学院人才计划项目（Y938091）；国家重点研发计划（2020YFA0608501）；辽宁工程技术大学学科创新团队（LNTU20TD-23） |
| 英文基金项目:CAS Talent Project Program (Y938091); National Key Research and Development Program of China (2020YFA0608501); Liaoning Technical University Discipline Innovation Team (LNTU20TD-23) |
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| Effect of ground cover changes on solar radiation absorption in Three Northeastern Provinces of China |
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SHUAI Yanminsup>1, 2, 3, 4, CHEN Yangyang, SHAO Congying, TIAN Yanjun, QU Ge, HUANG Jiapeng
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1. School of Geomatics, Liaoning Technical University, Fuxin 123000, China
2. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
3. CAS Research Center for Ecology and Environment of Central Asia, Urumqi 830011, China
4. College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
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| Abstract: |
| Background, aim, and scope Solar radiation is the main source of energy for terrestrial ecosystems. Small changes in the absorption of solar radiation at the ground surface can have a significant impact on the climatic environment. Natural and anthropogenic changes in ground cover are important factors affecting the absorption of solar radiation at the ground surface. This phenomenon is particularly pronounced in the mid and high latitudes. In order to quantify the influence of surface cover change on the absorption of solar radiation at the surface and to provide a scientific basis for changes in the climatic environment, this paper analyzed ground cover change, ground absorbed solar radiation change and the effect of ground cover change on ground absorbed solar radiation in the Three Northeastern Provinces of China from 2001 to 2018. Materials and methods In this study, the Three Northeastern Provinces of China were used as the study area. Firstly, satellite remote sensing data were used to obtain land cover data and albedo data for Aug. 1st of each year in 2001, 2005, 2010, 2015 and 2018. The albedo data were further used to calculate the absorbed solar radiation data at the ground surface. Next, the land cover data were used to count the area changes and shifts of different land classes over the five-year period. The land cover data were overlaid with the surface absorbed solar radiation data to obtain the mean and standard deviation of radiation absorption for different ground classes. The surface absorbed solar radiation data were subtracted to obtain the changes in surface absorbed solar radiation for 2001—2005, 2005—2010, 2010—2015 and 2015—2018. Ultimately, we used a combination of shifted changes in ground classes and changes in surface absorbed solar radiation data, with unchanged ground classes as a baseline and data such as slope orientation as an aid. We analyzed the effect of ground cover change on surface absorbed solar radiation at regional and pixel point scales. Results (1) The area of woodland and waters in the Three Northeastern Provinces of China increased and then decreased from 2001 to 2018, with an overall increase of 3.96% and 10.51% respectively. Cropland decreased and then increased, with a total decrease of 1.22%. Grassland continued to decrease, with an overall decrease of 19.36%. Building sites increased all the time, with a total increase of 11.08%. The main types of ground cover shifted were woodland, cropland and grassland. The main factors for the change in ground cover were China’s woodland protection policy and the saturation of the total woodland stock. (2) The five ground types absorb solar radiation in the order of waters ＞ building sites ＞ woodland ＞ grassland ＞ cropland. The surface absorption of solar radiation in the Songnen Plain, the Sanjiang Plain and the Songhua River Basin flowing through the Songnen Plain and the Sanjiang Plain varies significantly, by more than 25 W·m−2. (3) Changes in the ground cover type affected the absorption of solar radiation energy by the ground surface. There was a clear trend of interconversion between waters and cropland/grassland, cropland and woodland/grassland. In particular, the conversion of waters to both cropland and grassland radiation absorption values decreased significantly, while the opposite increased. The absolute difference between waters and cropland was a maximum of −156.66 W·m−2 in 2010—2015, and between waters and grassland was a maximum of 102.36 W·m−2 in 2005—2010. The radiative absorption values of woodland and grassland reclamation declined and conversely increased.
The absolute difference between woodland and cropland was a maximum of −13.94 W·m−2 in 2010—2015 when woodland converted to cropland, and between grassland and cropland was a maximum of 22.36 W·m−2 in 2001—2005 when cropland converted to grassland, respectively. Discussion Ground cover changes in the Three Northeastern Provinces of China from 2001—2018 were inextricably linked to natural factors and the influence of Chinese national policies. The main influencing factors were China’s woodland protection policy, restoration of woodland fire sites, saturation of total woodland, optimization of cropland patterns, sanding of grassland, expansion of water conservancy projects, and urbanization expansion. There were differences in the radiation absorption characteristics of different ground cover types. This was due to the nature of the ground type itself and the regional environment. When ground cover types changed, their ability to absorb solar radiation also changed. The degree of change could be influenced by different ground types and different environmental factors. Different spatial scales can also produce variability. We need to consider the effects of ground cover change on the absorption of solar radiation at the surface in an integrated and comprehensive way. Conclusions The Three Northeastern Provinces of China had frequent changes in ground cover from 2001—2018, with the area of grassland decreased by almost 20%. These changes were due to natural environmental change and policies issued by China since the 21st century. The extent to which solar radiation was absorbed by different ground cover types was different, with grassland being the strongest and cropland the least. In the past few years, the Songnen Plain and Sanjiang Plain regions were the most significant changes in the absorption of solar radiation by the ground cover. The change in ground cover type led to a change in solar radiation absorption at the ground surface, with the conversion of waters to cropland or grassland and the conversion of cropland to woodland or grassland showing the greatest change in radiation absorption values, and vice versa. Of these, the absolute difference in the conversion of waters to cropland amounts to −156.66 W·m−2 in 2010—2015. The variation in the absorption of solar radiation at the ground surface was related to the characteristics of the ground class itself, but was also limited by the regional environment. Recommendations and perspectives This study showed that surface cover change can affect the absorption of solar radiation at the surface to varying degrees. The unchanged land classes were used as a comparative analysis in this paper, and it was clear from the paper that some of the unchanged land classes showed significant changes in radiation absorption that should be of interest in future studies. |
| Key words: land surface cover changes surface absorption of solar radiation the Three Northeastern Provinces albedo |
