Mountainous Areas: Alleviating the Shortage of Cultivated Land Caused by Changing Dietary Structure in China

Wang, Yuhan; Yang, Chenyujing; Zhang, Yuanyuan; Xue, Yongji

doi:10.3390/land12071464

Cited by 4 publications

(2 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By 2021, there were approximately 29.3 million hectares of cultivated land in China with slopes above 6 • , accounting for 22.74% of the total cultivated land area. These sloping lands provide an important cultivation base for grain, vegetable, and fruit for the farmers in hills or mountains of China [1][2][3]. However, affected by the terrain slope, the sloping land usually has poor soil water retention capacity, making it prone to drought and greatly reducing crop yield and quality [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The purpose of this research was to study the distribution characteristics of droplet impact angles and shear stresses of a Rainbird LF1200 rotary sprinkler with slopes of 0, 10%, and 20% in the uphill and downhill directions. Specifically, the following aspects were carried out: (1) to assess the droplet impact angle distributions along the radial direction on sloping land; (2) to analyze the relationships among the droplet impact angle, shear stress, and distance from the sprinkler, as well as the relationship between the droplet impact angle and shear stress; and (3) to develop and verify calculation models for the radial droplet shear stress distribution.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

Hui,

Chen,

Shoukat

et al. 2023

Water

View full text Add to dashboard Cite

Droplet impact angle and shear stress are important indicators of surface runoff under sprinkler irrigation, and determining the distribution characteristics of these two indicators on sloping land is of great significance for preventing soil surface erosion. Therefore, three slopes (0, 10%, and 20%) and two directions (uphill and downhill) under a Rainbird LF1200 rotary sprinkler were considered in this study. The distribution of droplet impact angles and shear stresses along the radial direction were investigated under various working conditions. The correlations among the droplet impact angle, shear stress, and distance from the sprinkler were also analyzed. These results indicated that the closer to the sprinkler, the larger the droplet impact angle and the smaller the shear stress, and the two indicators gradually decreased and increased with the increase of distance from the sprinkler, respectively. Accordingly, there was a very high potential for soil surface runoff at the spray jet end. It was also observed that the uphill direction generally had a greater impact angle and less shear stress than flat land, while the downhill direction had exactly the opposite result. However, regardless of the direction, an increase in the slope could intensify its effect on the droplet shear stress and impact angle. Therefore, there is an urgent need to focus on the occurrence of surface runoff in soils with larger slopes. In addition, two radial droplet shear stress distribution models were developed, and it was verified that Model 2 had higher accuracy (MAE = 176.6 N m−2, MBE = 32.8 N m−2, and NRMSE = 14.4%) and could be used to predict the average droplet shear stresses at different slopes, directions, and distances from the sprinkler. This study contributes to the soil erosion prevention and the sprinkler irrigation system optimization on sloping land.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

Hui,

Chen,

Shoukat

et al. 2023

Water

View full text Add to dashboard Cite

show abstract

A novel deep learning model for extracting arable land from high-resolution remote sensing images in hilly areas: a case study in the Sichuan Basin of Southwest China

Chen,

Xiao,

Zhang

et al. 2024

Geocarto International

View full text Add to dashboard Cite

Assessing the equilibrium of food supply and demand in China’s food security framework: a comprehensive evaluation, 1980–2017

Wei,

Fang,

Wei

et al. 2024

Front. Sustain. Food Syst.

View full text Add to dashboard Cite

The continuous upward trajectory observed in total grain production serves as a fundamental pillar for guaranteeing food security. Nevertheless, relying solely on the measurement of China’s overall food security status through total grain output is inherently biased and neglects to capture the comprehensive nature of food security. This study adopts a food supply and demand balance perspective and constructs an evaluation indicator system for food security based on indicators such as grain yield per unit area, per capita grain possession, grain inventory, and inventory ratio. The weight of each indicator in the food security system is calculated using the entropy value method, and a comprehensive evaluation of China’s food security level from 1980 to 2017 is conducted. The study revealed that China’s food supply and demand exhibited a discernible upward trajectory in development. Notably, the food supply demonstrated greater volatility, whereas the food demand remained relatively stable but experienced incremental growth. Between approximately 1985 and 1993, China’s food supply and demand subsystem briefly experienced a state of mild imbalance, followed by a state of moderate imbalance around 2003. These imbalances were primarily attributed to insufficient effective food supply. In terms of the equilibrium between supply and demand in the context of food security, China’s food supply and demand exhibit a predominantly balanced condition with a slight surplus, wherein the adequacy of food supply significantly influences food security. Furthermore, the provision of policy support serves as a robust assurance for food security, and China’s existing policy framework for food security demonstrates a constructive impact.

show abstract

Mountainous Areas: Alleviating the Shortage of Cultivated Land Caused by Changing Dietary Structure in China

Cited by 4 publications

References 84 publications

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

A novel deep learning model for extracting arable land from high-resolution remote sensing images in hilly areas: a case study in the Sichuan Basin of Southwest China

Assessing the equilibrium of food supply and demand in China’s food security framework: a comprehensive evaluation, 1980–2017

Contact Info

Product

Resources

About