啊啊啊91香蕉视频,91大神xh98xh http://shuigongzhu.com Yangtze Institute for Conservation and Development Wed, 24 Mar 2021 13:53:06 +0000 en-US hourly 1 Land use changes in the Yellow River basin since this century concentrated in its central and eastern regions http://shuigongzhu.com/en/land-use-changes-in-the-yellow-river-basin-since-this-century-concentrated-in-its-central-and-eastern-regions/ Wed, 16 Sep 2020 07:24:58 +0000 http://shuigongzhu.com/?p=2306 Land provides the basis for livelihood and development, and the change in land use is the most direct reflection of anthropogenic interference to the nature.

Liao et al. (2020) analyzed the changes in land use in the Yellow River Basin from 1980 to 2015. Their results show that,since the beginning of the 21st century, most land use changes in the Yellow River basin took place in the middle and east regions of the basin. Urbanised land took an evident increase by 44.32%. Grassland, arid land and forests are the main types of land use in the Yellow River basin, of which the former two decreased by 1.6% and 1.23% respectively, while forests increased by 2.53%.

Spatial distribution of land use in the Yellow River basin from 1980 to 2015. Grassland, woodland and dry land are the main land use types in the basin, and the increase of urbanised land is the most evident.
Spatial distribution of land use in the Yellow River basin from 1980 to 2015. Grassland, woodland and dry land are the main land use types in the basin, and the increase of urbanised land is the most evident.

Urbanised land Arid land Unused Forests Water body Paddy field Grass land

Although the reasons behind land use changes are complex and diverse (Jia et al. 2007), Liao et al. (2020) think that the contribution from population change and socio-economic development to such changes cannot be ignored.

The increase of urbanised land and forests is closely related to China’s economic development and afforestation activities in the basin. Soil and water conservation measures such as afforestation have well reduced soil erosion and hence sedimentation, and played a positive role in the ecological conservation and high-quality development of the Yellow River (Hu et al. 2020). In its future economic development, it is necessary to continue the efforts in soil conservation and ecological rehabilitation, which, of course, are hinged on proper policy implementation. These would form the foundation for the rational and sustainable development of resources in the Yellow River Basin.

Full paper

  • Liao Hui, Shu Zhangkang, Jin Junliang, Yang Chuanguo, Wang Guoqin. Study on the characteristics and driving forces of land use change in the Yellow River basin from 1980 to 2015. South-to-North Water Transfers and Water Science & Technology.  http://kns.cnki.net/kcms/detail/13.1430.TV.20200520.1 (in Chinese with English abstract)
]]> Northern China Rivers Continue to Wither http://shuigongzhu.com/en/northern-china-rivers-continue-to-wither-in-runoff/ Fri, 19 Jun 2020 07:01:37 +0000 http://shuigongzhu.com/?p=1063 Surface water is the easiest source of fresh water for human access, and therefore it plays a crucial role in the production and livelihood of human kind. River runoff is one of the primary forms of surface water.

Zhang et al (2020) studied the runoff records of Chinese rivers in the past 62 years (1956 to 2018). Their analysis shows that almost all major rivers of China are in a state of decline in terms of runoff. Rivers of Northern China (the Yellow and rivers to its north) are declining more significantly. The Yellow, the Haihe and the Liaohe, compared to their runoff in the 1980s, have witnessed a decline in runoff of more than a quarter. The Haihe River is leading the league by a decrease of more than 80%.

Runoff records at representative gauge stations on the Xijiang, the Yangtze, the Huaihe, the Songhuajiang, the Yellow, the Liaohe, and the Haihe between 1956-2018. Southern rivers like the Xijiang, the Yangtze and the Huaihe are changing slightly, yet northern rivers like the Songhuajiang, the Yellow, the Liaohe and the Haihe are witnessing significant declines with that of the Haihe being the most evident. (Zhang et al 2020)
Runoff records at representative gauge stations on the Xijiang, the Yangtze, the Huaihe, the Songhuajiang, the Yellow, the Liaohe, and the Haihe between 1956-2018. Southern rivers like the Xijiang, the Yangtze and the Huaihe are changing slightly, yet northern rivers like the Songhuajiang, the Yellow, the Liaohe and the Haihe are witnessing significant declines with that of the Haihe being the most evident. (Zhang et al 2020)

Under global warming, such changes might fit into the “dry places getting drier” paradigm (yet many scientists believe this paradigm over-simplifies the complexity of climate change impacts, for example, see Byrne et al. 2015, Feng et al. 2016), but river runoff decline in Norther China could be the result of the combination of multiple drivers. Apart from regional climate change, human interference impacts surface water significantly too. The authors therefore ague that “scientifically identifying the impacts from different drivers on river runoff is crucial to regional water management”.

Scientifically identifying the impacts from different drivers on river runoff is crucial to regional water management

Zhang et al 2020

Among the most developed three economic clusters of China, only the Bohai Bay rim, with Beijing, Tianjin and Hebei at its core, is located in semi-humid or semi-arid regions. The decline in surface water availability means this economically significant cluster is becoming more reliant on other sources of water, such as groundwater or cross-basin diversion. This would further exacerbate the conflict between different water uses such as for human consumption and environmental functions, which would pose an even greater challenge for China’s technical and institutional capacities in managing its water.

Full paper

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