The pattern of grain self-sufficiency plays a fundamental role in maintaining food security. We analyzed the patterns and determinants production demand, as well self-sufficiency, China over 30-year period. results show that China’s total production, with an obvious northeast–southwest direction, increased by 63%, yields rice, wheat, corn, tubers, beans 16, 49, 224, 6, 103%, respectively. trends ration feed consumption changes at provincial scale were roughly same national scale, ratio...

Abstract Ecosystem service flow plays a vital role in the formation, transportation, transformation, and maintenance of ecosystem services. For services with spatiotemporal mismatch supply demand, explains integrated process ‘supply-flow-demand’ The present study evaluates demand water provision Qinghai-Tibet Plateau simulates spatial pattern transmission mechanism Additionally, establishes dynamic static security indices identify level to quantify resources under changing ecological...

In petroleum-contaminated aquifers, iron (III) serves as an electron acceptor, enabling microbial degradation of organic matter. While previous studies have focused on reduction and matter under laboratory conditions, research iron-associated microorganisms in aquifers is limited. To explore the diversity distribution such natural settings, this study used metagenomic analysis iron-rich, aquifer. Sixteen groundwater samples from both pollution source background areas were collected for...

Abstract Ecosystem service (ES) flows across geophysical and administrative boundaries are ubiquitous receiving more attention in an increasingly metacoupled world. Omitting trans-boundary ES from assessments will lead to unilateral conclusions underestimation of contributions over distances. Inner Mongolia is important ecological security barrier China Eurasia, but the effect this difficult be quantitatively evaluated rarely assessed. This study assessed function perspective flows,...

An understanding of the relationships among multiple ecosystem services (ES) facilitates management and decision-making. The study ES bundles can well explain complex interactions between different in a region. Shenyang is significant economic development food production area Northeast China, with diverse range types. In this study, we quantified eleven from Shenyang, China (two provisioning services, eight regulating one cultural service). trade-offs synergies were analyzed by Spearman’s...

Transit-oriented development (TOD) has a close relationship with ecology since its inception and aims to create livable sustainable environments. However, few studies have examined the key point of in construction TOD assessment models. This paper takes Odawara as an example, city located on outskirts Tokyo metropolitan area. Based node–place model, new dimension is introduced expand two-dimensional model into three-dimensional primarily applied 18 stations Odawara. Using this study explores...

Strontium is a kind of trace element. Groundwater containing strontium called mineral water when its content reaches level that beneficial for human physiology. Some groundwater resources in Shijiazhuang are rich strontium. In this study, samples collected from 103 sites were studied the hydrochemical characteristics and formation mechanism system City. The methods source provenance analysis, factor correlation runoff condition analysis carried out study. results showed eastern higher than...

Abstract This study delves into the mechanism of dynamic sliding friction between layers graphene and its strain effect, through numerical analysis using molecular dynamics simulations. To eliminate influence commensurability edge a pair model with annular as slider is established. The research explores quantifying effects temperature, normal load, velocity, support stiffness, axial on layers. coupling effect temperature other influencing factors also clarified. results indicate that...

Inner Mongolia is the important ecological barrier zone in northern China, which plays an role prevention and control of wind regional ecosystem. Based on Revised Wind Erosion Equation (RWEQ) model cost-recovery method, this study simulated erosion service (WEPS) 2010 2015, investigated spatial pattern material monetary value WEPS, analyzed differences among various cities ecosystems. The results indicated that total WEPS was estimated to be 73.87×108 t 4.61×108 less than 2010, while...

The groundwater in Gaobeidian city is used for drinking, irrigation, industrial production, and other purposes. With the rapid development of economy urbanization, quality has been seriously affected. main purposes this paper are to evaluate study area on basis understanding hydrochemical characteristics assess possible health risks children adults. In paper, entropy weight method was determine each evaluation parameter, basis, carried out, spatial distribution map drawn according results....

This study was carried out to evaluate the groundwater quality in Huangbizhuang town, which is an important water source for Shijiazhuang and Beijing, China. Fifty-six geo-referenced samples were collected from pumping monitoring wells July September 2018. The investigated applicability of two weighting methods, expert method, principal component analysis assessment evaluated status leading causes pollution by chemical index multivariate statistical methods. results show that overall good,...

Ecosystem service research is essential to identify the contribution of ecosystem human welfare. As an important ecological barrier zone, Qinghai-Tibet Plateau (QTP) supports use a crucial wind erosion prevention (WEPS) improve environment quality. This study simulated spatiotemporal patterns WEPS based on Revised Wind Erosion Equation (RWEQ) and its driving factors. From 2000 2015, total provided in QTP ranged from 1.75 × 109 kg 2.52 kg, showing increasing then decreasing trend. The average...

With the rapid development of aviation industry, many negative effects on local environment have been reported. This study examined land use and cover (LULC) ecosystem service value (ESV) airport economic zones (AEZs) in China assessed changes LULC ESV. The results indicate that changed significantly from 1990 to 2015, characterized by increase construction (increase rate, 68.53%) water bodies 2.32%) decrease cropland (decrease 4.28%), forest 0.73%), grassland 4.64%) unused 6.36%). ESV AEZs...

Cotton seed production is the main form of agriculture in Xinjiang, China. Unreasonable distribution cotton results a waste water, land, and human resources. In this study, we established hierarchical classification integrating method; investigated spatial suitability climate, land water resources, infrastructure; examined risk planting history; integrated history to produce layout for early-maturing (EMC), early–medium-maturing (EMMC), long staple (LSC) Xinjiang. The indicated that...

Due to the multi-factor coupling effect, rule of interlayer friction in low-dimensional homogeneous thin-wall shell structures is still unclear. Double walled carbon nanotubes (DWCNTs) having a typical structure are selected for this study. The numerous chiral DWCNTs investigated using molecular dynamics simulations systematically analyze and understand mechanisms various factors friction. To eliminate influence edge high-speed pure rotation model used. results demonstrate that with varying...

Using traditional manual analysis to test the quality of Baijiu, there are often disadvantages such as long testing time and large workload, which cannot accurately efficiently determine Baijiu. In this experiment, a neural network model based on Raman spectroscopy Back Propagation-Genetic Algorithm (GA-BP) is developed achieve identification Baijiu parameters promote improvement production process. The 496 bottles were selected samples. spectra 380 116 groups samples used training data sets...

As a very important part of the urban ecosystem, green space system plays an active role in maintaining ecosystem stability, providing services, and improving quality environment. In order to deal with problems brought about by deterioration ecological environment, it is necessary study analyze spatial distribution pattern, evolutionary characteristics services maximize its benefits comprehensive functions. this study, we took Beijing area as example, based on data remote sensing data, first...

Abstract The mechanism of dynamic sliding friction between graphene layers and its strain effect is theoretically analyzed in this paper. A pair model with an annular as slider built to eliminate the influence commensurability edge effect. effects temperature, normal load, velocity, support stiffness axial on are investigated. coupling temperature other influencing factors clarified. results show that load increases force by decreasing layer spacing. firstly enhanced velocity increase then...

The mineralization of benzene, toluene, ethylbenzene, and xylene (BTEX) into inorganic substances by microorganisms may affect the water–rock interaction. However, few studies have quantitatively analyzed processes. To reveal this mechanism, in study, nitrate toluene were taken as typical electron acceptor BTEX, respectively. Based on hydro-geochemical theory, mechanism mathematical model established. In addition, was verified with a experiment. demonstrated that H+ main factor dissolution...

In order to make better use of the instruments in laboratory, fuzzy compreh-ensive evaluation based on entropy weight method is selected evaluate function measuring instrument, so as judge whether instrument laboratory has reached end life and improve utilization instrument. Rate reduce unnecessary losses. Five indicators for judging quality were selected, their weights determined according establish a comprehensive evalu-ation model. This used experimental equipment equal-thickness...

Afforestation in the Three North Region (TNR) of China has received wide concern due to low survival rate and threats water security associated with lack available precipitation for vegetation. It is crucial provide a spatial layout revegetation according achieve vegetation cover target. This study investigated pattern precipitation, determined suitable distribution based on ecological requirements proposed an optimized scheme by comparing actual patterns. The results indicated that matched...