Soil quality should be accurate evaluated at the beginning of lifecycle after land consolidation for eco-sustainable development on the Loess Plateau

The Geo-Hazards Triggered of Serial Reclamation Land of Extreme Precipitation in Typical Regions of the Loess Plateau Gao Zhe1,Zhang Genguang 1*,Gao Jian'en1,2,3,Li Xingyao1,Han Jianqiao2,3,Kang Youcai3,Guo Zihao3,Long Shaobo2,Dou Shaohui2,Zhang Yuanyuan3 1. College of Water Resources and Architectural Engineering, Northwest A&F University, 712100, Yangling, Shaanxi, China; 2. Institute of Soil and Water Conservation, Northwest A&F University, 712100, Yangling, Shaanxi, China; 3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi, China;The &#8220;Gully Land Consolidation Project&#8221;(GLCP) was widely carried out all over the world, such as Spain, the United States and China. It was a new attempt to solve the shortage of regional land resources. Aiming at the problem that the influence of extreme rainstorms on the &#8220;Gully Land Consolidation Project&#8221;(GLCP) on the Loess Plateau.By using the method of actual measurement and analysis of categorical data, the erosion disaster in July 26 2017 was investigated in Niu Xue Gully of Wuding River Watershed in Zizhou County of the Central part of the Loess Plateau. The results showed :&#160;(1) The Niu Xue Gully Small Watershed in Zizhou County (109&#176;55'25"E, 37&#176;39'46"N), which was located in the central part of the Loess Plateau and belonged to the northern Shaanxi Loess Hilly-Gully region. The Niu Xuegou catchment covered an area of 0.48 km2 and the average altitude of the region in about 1000-1200 meters, land consolidation in the basin about 38 mu&#65288;25333.3m2&#65289;since 2014.(2) This storm was characterized by "long duration and large precipitation", the accumulated rainfall was 147.9 mm, the average rainfall intensity was 13.45 mm/h, the maximum rainfall intensity was close to 5 mm/min, the maximum flood peak discharge was 44.64 m3/s, the flood duration was about 11 hours, and the flood recurrence period was more than once in a hundred years.(3) The storm caused nearly a thousand geological hazards at the channel of the basin. The main types of disasters were as follows, gravity erosion types, such as landslides, landslides, and mudflows, account for 14.85% of the conventional geological hazards; secondary disasters of water erosion types, such as trench erosion and dam erosion, occurring at different locations on the slope, accounted for 51.05% and composite new-derived land destruction and dam break disasters account for nearly 10% .(4) The damage of cascade land preparation was closely related to the average flood discharge, embankment height and ecological vegetation cover in the watershed. The investigation provided technical support for the consolidation of the Chinese implementation of the "Cropland to Forest (Grass)" results on the Loess Plateau, and also provided theoretical support for the safe implementation of the &#8220;Gully Land Consolidation Project&#8221;(GLCP) around the world. Keywords: The loess plateau; Extreme rainstorm;The &#8220;Gully Land Consolidation Project&#8221;(GLCP)Funding:(National Key R&D Program of China: 2017YFC0504703)&#65307;(National Natural Science Foundation of China,41877078,41371276,51879227);(Research and Development and Integrated demonstration of key Technologies in soil and Water Conservation Engineering,A315021615)&#160; &#160; &#160; &#160;&#160;

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Temporal and Spatial Evolution and Obstacle Diagnosis of Resource and Environment Carrying Capacity in the Loess Plateau

10.21203/rs.3.rs-172784/v1 ◽

2021 ◽

Author(s):

Huan Huang ◽

Rui Wang ◽

Jue Wang ◽

Jixing Chai

Keyword(s):

Sustainable Development ◽

Loess Plateau ◽

Carrying Capacity ◽

The Loess Plateau ◽

Ecological Civilization ◽

Entropy Weight ◽

Per Capita ◽

Temporal And Spatial ◽

Resource And Environment ◽

Sown Area

Abstract In the Loess Plateau, natural resources are scarce and the ecological environment is fragile. Sustainable development requires special attention paid to resource and environmental carrying capacity (RECC). This paper selects 24 representative cities in five natural areas of the Loess Plateau, uses the entropy-weight-based TOPSIS method to evaluate and analyze the RECC of each city and region from 2013 to 2018, establishes a diagnosis model to identify the obstacle factors restricting the improvement of RECC and constructs the theoretical framework of RECC' system mechanism. Results show that the RECC of Loess Plateau is increasing in general but relatively small. The environmental and social subsystem have the highest and lowest carrying capacity respectively. There is an obvious contradiction between economic development and the environment. Population density, investment in technological innovation, per capita sown area of crops, and per capita water resources are the main obstacles affecting the improvement of RECC in the Loess Plateau. Such evaluation and diagnosis could support ecological civilization and sustainable development.

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