scholarly journals Correlation Assessment of NDVI and Land use Dynamics with Water Resources for the Southern Margin of Mu Us Sandy Land, China

2021 ◽  
Author(s):  
Menglong Zhao ◽  
Yu Wang ◽  
Siyuan Liu ◽  
Ping-an Zhong ◽  
Hongzhen Liu ◽  
...  
Keyword(s):  
Water Resources ◽  
Water Consumption ◽  
Water Shortage ◽  
Vegetation Coverage ◽  
Causal Relationships ◽  
Sandy Land ◽  
Mu Us Sandy Land ◽  
Southern Margin ◽  
Land Water ◽  
Artificial Vegetation

Abstract To prevent desertification, countries all over the world have made diversified efforts and vegetation restoration has been proved to be an effective approach. However, for sandy land that has limited water resources, measures such as artificial vegetation, may lead to the increase risk of drought. While affirming the achievements of sand utilization, there are many controversies exist regarding the advantages of turning deserts green, especially considering the water scarcity. Therefore, the long-run and causal relationships between sandy land, water consumption and vegetation coverage are necessary for explorations. Taken the southern margin of the Mu Us Sandy Land as the study area, this study explored the interactions between sandy land, water consumption and NDVI over a period of 2000–2018 with a VAR model approach. In the study area, various revegetation projects have made great achievements, resulting in a significant reduction of the sandy land area. In addition, the NDVI has ascend from 0.196 in 2000 to 0.371 in 2018 with a ratio of 89.3%. Results showed that there exist long-term stable equilibrium and causal relationships between water consumption with sandy land and NDVI. The increase of NDVI is relatively the direct factor causes the increase of water consumption. It could be inferred that those artificial vegetation measures may be based on large amount of water consumption, which may aggravate further water shortage and ecological damage. More scientific and stronger water resources management measures need to be implemented locally to achieve a balance between water resources and revegetation.

scholarly journals Water resources planning in bioethanol production from sugarcane

Memorias ◽  
2018 ◽  
pp. 30-35
Author(s):  
Danny Ibarra Vega Danny Ibarra Vega ◽  
Carlos Peña Rincón ◽  
Johnny Valencia Calvo ◽  
Johan Manuel Redondo ◽  
Gerard Olivar Tost
Keyword(s):  
Mathematical Model ◽  
High Risk ◽  
Water Resources ◽  
Water Consumption ◽  
High Water ◽  
Water Shortage ◽  
Agricultural Crops ◽  
Bioethanol Production ◽  
Water Resources Planning ◽  
Resources Planning

The biofuels industry has grown and has positioned itself in Colombia for national purposes, these come from biomass sources such as agricultural crops. Bioethanol is the most used in Colombia and is obtained from sugarcane. One of the main concerns of the sector and society, is the high water consumption associated with agricultural crops (9,000 m3 / ha-year), there are currently 232,000 hectares of sugarcane for the production of sugar and bioethanol. Given the aforementioned, the need arises to carry out a planning of industrial increase of the sector taking into account as a main base the demand and availability of water resources for different activities in the Cauca river basin and the demand for sugarcane crops. In this document it is presented a mathematical model and the evaluation of different scenarios of the estimation of the trend of water consumption in the bioethanol production process in Colombia and in this way to establish scenarios of high risk of water shortage both for the population, interested parties and cane cultivation.

Vegetation Coverage change and its influencing factors in the Mu Us Sandy Land from 2000 to 2015

2020 ◽  
Author(s):  
Yan Gao
Keyword(s):  
Influencing Factors ◽  
Annual Growth ◽  
Annual Precipitation ◽  
Vegetation Coverage ◽  
Sandy Land ◽  
Annual Average ◽  
Growth Season ◽  
Mu Us Sandy Land ◽  
Average Temperature ◽  
Annual Average Temperature

<p>Introducing and establishing sand-binding vegetation, as one of important approaches for combating desertification, has already applied in the ecological restoration and recovery in Mu Us sandy land for more than 60 years. Study on the dynamics of vegetation coverage in Mu Us Sandy Land and its influencing factors is thus a crucial requirement for guiding and establishing sand-binding vegetation. Based on MOD13A2 NDVI time-series data from 2000 to 2015，annual average temperature, annual precipitation, annual growth season precipitation, the land-use/land-cover (LULC) data, and topographic data, explored its dynamics during 2000–2015 and detected their influencing factors by the geo-detector method. The results showed that: (1) the vegetation coverage decrease from east to west in the Mu Us sandy land; (2) from 2000 to 2015，the vegetation coverage in the Mu Us sandy land has been increasing generally, the growth rate was 0.006 /a; (3) the number of pixels with significant increase in vegetation coverage accounted for 33.24% of the study area, meanwhile there was obvious spatial difference, the areas with significant or extremely significant increase of vegetation coverage were mainly distribute in eastern parts; (4) the main influencing factors of vegetation coverage change were annual precipitation, annual growth season precipitation, annual average temperature and LULC. Results indicate that, the influence of climate factors on Mu Us sandy land vegetation coverage was higher than LULC. It is necessary to put forward a suitable vegetation restoration plan under the projected climate change.</p>

scholarly journals The Evapotranspiration of Tamarix and Its Response to Environmental Factors in Coastal Saline Land of China

Water ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2273
Author(s):  
Huanyu Chen ◽  
Ce Yang ◽  
Angyan Ren ◽  
Kai Guo ◽  
Xiaohui Feng ◽  
...  
Keyword(s):  
Water Resources ◽  
Water Consumption ◽  
Saline Soil ◽  
Water Shortage ◽  
Groundwater Table ◽  
Residual Water ◽  
Water Shortages ◽  
Soil Rehabilitation ◽  
Coastal Saline Soil ◽  
Crop Coefficients

(1) Background: As a halophytic species, Tamarix (Tamarix chinensis) can be used for saline soil rehabilitation in China. The reclamation and rehabilitation of saline soil depend on the water consumption of plants. However, whether water resources in saline soil can support the construction of Tamarix vegetation is still unknown. (2) Methods: In this study, we measured the transpiration (T) of Tamarix for 3 years using sap flow and the evaporation (E) for 1 year using a micro-lysimeter in Tamarix land. The evaporation values in 2016 and 2017 were estimated with the soil crop coefficients obtained in 2018. (3) Results: The evapotranspiration (ET) ranged from 514.2 to 573.8 mm and was greatly affected by the wind speed, VPD and groundwater table. Transpiration was the main form of water consumption in this region, accounting for 60.2% of the total evapotranspiration. Compared with bare land, vegetation construction increased soil moisture dissipation by 377.6 mm in 2018. According to on-site measurements and estimates, the water shortage in the dry year was 107.2 mm, and the residual water values in the normal year and wet year were 77.8 mm and 187.5 mm, respectively. May and September were months of widespread water shortages in different precipitation years. Although the cultivation of this plant increased water consumption, the groundwater table remained at approximately 0.5 m during the study year. (4) Conclusions: These results indicated that planting Tamarix in coastal saline soil was feasible for the reclamation and rehabilitation of saline soil. In the dry year (2017), the consumption of evapotranspiration exceeded the precipitation. The inverse occurred in the normal year (2016) and wet year (2018). Taken together, our findings showed that the water resources in the coastal saline soil of China could tolerate vegetation construction and laid a strong foundation for saline soil rehabilitation.

On the Scenario Simulation of Xinjiang Production of Water Resources Based on the IPAT Model

2010 ◽  
Vol 113-116 ◽  
pp. 529-535
Author(s):  
Hong Li Zhang ◽  
Yong Qi Guo
Keyword(s):  
Economic Growth ◽  
Water Resources ◽  
Water Consumption ◽  
Industrial Structure ◽  
Water Shortage ◽  
Water Saving ◽  
Development Scenarios ◽  
Current Water ◽  
Mode Of Development ◽  
Strong Control

This document explains and demonstrates which should be taken in Xinjiang mode of development in the current water shortage situation. Using scenario analysis method and IPAT model（Impact, Population, Affluence, Technolog）, the article demonstrates seven possible development scenarios and analyzes each scenarios for the future use of water resources in oasis. By comparing and analysising, the scenario 4 (accelerated economic growth, adjusting the industrial structure, strengthen water-saving water consumption of the weak control) and the scenario 7 (accelerated economic growth, adjusting the industrial structure, strengthen water-saving water consumption of the strong control) can be the most executive mode. This document will play a positive guiding significance in the actual work of water resources in Xinjiang Oasis on some degree.

The Efficient Water Resources Strategy

2014 ◽  
Vol 998-999 ◽  
pp. 1512-1515
Author(s):  
Zhao Jia
Keyword(s):  
Linear Programming ◽  
Water Resources ◽  
Water Consumption ◽  
Large Scale ◽  
Water Shortage ◽  
Drainage Basins ◽  
Large Scale System ◽  
Average Value ◽  
The Government ◽  
Water Strategy

Relevant bodies of the United Nations in Vienna on March 22, World Water Day, said that if people did not change their way to consume, in this case, 2.5 billion people would face water shortage by 2025 which is of no doubt, and about 5 billion people would live in an area that water has difficulty in self-sufficiency. In this paper, China is selected to be an example. As for models, there are 2 models given in this paper, large-scale system and linear programming. Based on large-scale system model, water resources are divided in the largest 10 drainage basins of China as 10 units which comprise the first level. Then, the use of water is adopted for 4 kinds defined as 4 units which make up the second level. We use polynomial fitting algorithm to estimate 4 kinds of average water consumption in 2015, 2020 and 2025.Then we use linear programming skill to calculate the best 4 kinds of water consumption distribution of 10 drainage basins in 2015, 2020 and 2025 respectively. Comparison and analysis between the best distribution and the estimated average value made in the first step, enables the construction of a preliminary water strategy from 2013 to 2025, which illustrates storage, movement, de-salinization and conservation of water specifically in this paper. According to Analytic Hierarchy Process (AHP), a brief evaluation of models is presented from three angles. At last, in a word, the result is given roughly that the government should increase the distribution of industry water resources appropriately and decreases or keep the same level with the rest of water resources allocation.

USE AND PROTECTION OF WATER RESOURCES OF AZERBAIJAN

2017 ◽  
Author(s):  
Ramiz Tagirov ◽  
◽  
Maya Zeynalova ◽  
Keyword(s):  
Water Resources ◽  
Water Supply ◽  
Fresh Water ◽  
Water Consumption ◽  
Cultivated Land ◽  
Per Capita ◽  
The Republic ◽  
Active Temperature

The article examines the problem of fresh water, since in terms of water supply from its own resources per capita and per 1 km2, the republic is 8 times behind Georgia, 2 times behind Armenia. Significant water consumption in Azerbaijan is caused by its arid territory with a predominance of active temperature and a lack of precipitation, which leads to intensive irrigation of crops. At the same time, artificial irrigation is used on 70% of the cultivated land.

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