| 1. |
- Andrén, Olof, et al.
(författare)
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Agroecosystem research in Uppsala, Sweden and Naiman, China: Some observations 1987–2014
- 2016
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Ingår i: Sciences in Cold and Arid Regions. - 1674-3822. ; 8, s. 1-8
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Forskningsöversikt (refereegranskat)abstract
- The recent economic progress in China has stimulated scientific research in sandy lands in Inner Mongolia, where the Institute of Desert Research, Chinese Academy of Sciences (now CAREERI) has a leading position. Economic progress naturally creates financial resources for research, and also a dire need for solutions to emerging environmental problems following development, where wind-blown dust from Inner Mongolia adds to the severe particle air pollution in many Chinese cities. This paper presents selected results and observations made during Chinese-Swedish cooperation projects spanning 25 years. Results and experiences from sandy land research concerning climate, vegetation, root dynamics, soil carbon balances, etc. are briefly presented. The evolution of the Naiman Desertification Research Station, 520 km northeast of Beijing, from 1988 to 2013 is duly noted and commented. An overview of the ICBM soil carbon model concept follows and a few recommendations for future scientific advancement in Chinese arid lands are given.
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| 2. |
- Li, R. Q., et al.
(författare)
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Contrasting vegetation changes in dry and humid regions of the Tibetan Plateau over recent decades
- 2018
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Ingår i: Sciences in Cold and Arid Regions. - 1674-3822. ; 10:6, s. 482-492
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Tidskriftsartikel (refereegranskat)abstract
- An overall greening over the Tibetan Plateau (TP) in recent decades has been established through analyses of remotely sensed Normalized Difference Vegetation Index (NDVI), though the regional pattern of the changes and associated drivers remain to be explored. This study used a satellite Leaf Area Index (LAI) dataset (the GLASS LAI dataset) and examined vegetation changes in humid and arid regions of the TP during 1982-2012. Based on distributions of the major vegetation types, the TP was divided roughly into a humid southeastern region dominated by meadow and a dry northwestern region covered mainly by steppe. It was found that the dividing line between the two regions corresponded well with the lines of mean annual precipitation of 400 mm and the mean LAI of 0.3. LAI=0.3 was subsequently used as a threshold for investigating vegetation type changes at the interanual and decadal time scales: if LAI increased from less than 0.3 to greater than 0.3 from one time period to the next, it was regarded as a change from steppe to meadow, and vice versa. The analysis shows that changes in vegetation types occurred primarily around the dividing line of the two regions, with clear growth (reduction) of the area covered by meadow (steppe), in consistency with the findings from using another independent satellite product. Surface air temperature and precipitation (diurnal temperature range) appeared to contribute positively (negatively) to this change though climate variables displayed varying correlation with LAI for different time periods and different regions.
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