The 16S rRNA gene works as a rapid and effective marker for the identification of microorganisms in complex communities; hence, huge number microbiomes have been surveyed by amplicon-based sequencing. resolution is always considered only at genus level; however, it has not verified on wide range microbes yet. To fully explore ability potential microbial profiling, here, we propose Qscore, comprehensive method to evaluate performance amplicons integrating amplification rate, multitier...

Abstract An oasis is a unique natural landscape in arid and semi-arid areas, significant for regulating regional microclimates hydrological processes deserts. However, little known regarding the response of plants communities to various environmental factors. Nineteen sample plots (50 m × 50 m) were selected Daliyabuyi Oasis Taklimakan Desert hinterland based on location groundwater monitoring wells 76 vegetation quadrats (25 25 established. A two-way indicator species analysis, Mantel test,...

Vegetation in natural desert hinterland oases is an important component of terrestrial ecosystems. Determining how vegetation responds to variability critical for a better understanding desertification processes and their future development. The aim this study characterize the spatial distribution reveal different environmental factors affect changes. Taking Taklamakan Desert oasis as our research object, we analyzed effects on using time-series normalized difference index (NDVI) combined...

Accurate estimation of desert vegetation transpiration is key to regulating water resources ecosystems. Sap flow density (SFD) can indirectly reflect a tree’s consumption, and it has been affected by climate warming groundwater depths in responses meteorological conditions are further tree different sizes. However, how factors affects sap among sizes remains poorly understand. In this study, 50 × m P. euphratica stand was selected as sample plot the hinterland Taklamakan Desert, SFD measured...

The relationship between the growth characteristics of vegetation and factors that limit protection relevant populations communities needs to be clarified. To gain a deeper understanding mechanism couples groundwater with Populus euphratica in desert ecosystem, as well explore effect its competitive Tamarix chinensis under restrictive conditions self-development community succession, we established 11 typical sample plots Daliyaboyi Oasis Taklimakan Desert. In current study, evaluated these...

Understanding the water use characteristics of vegetation is crucial for guiding rational allocation resources and restoration sustainable in natural oases arid desert areas. To analyze Populus euphratica Oliv. Tamarix chinensis Lour. at different stages growth Daliyabuyi pristine oasis northwestern China, δ18O values plant xylem 15 sample trees with sizes per species, potential sources (i.e., river water, soil groundwater), δ13C leaves were measured August 2019 June 2020. The results show...

Abstract Soil is the largest carbon reservoir in terrestrial ecosystems, and thus minor changes it can dramatically affect atmospheric CO 2 concentrations. In northwestern arid zone of China, prediction soil organic (SOC) often limited by scarcity samples scale depth research, which limit understanding cycling processes ecosystems. Therefore, this study produced digital maps SOC stocks (SOCS) for two periods (1980‐1990 2010‐2020) at a 90‐m resolution based on historical profile data random...

Abstract Preventing soil salinization is key to the healthy development of agroecosystems in arid regions. Notably, long‐term anthropogenic irrigation accelerates secondary salinity accumulation areas; however, regional‐scale spatial patterns pre‐ and post‐irrigation season remain unclear. Accordingly, field observations over two periods ( n = 182 samples), along with environmental covariates randomForest algorithm, were used estimate horizontal vertical distributions (12 depths) Weiku Oasis...

Plant functional traits reflect the capacity of plants to adapt their environment and underlying optimization mechanisms. However, few studies have investigated trade-off strategies for in desert-wetland ecosystems, mechanisms by which surface water disturbance groundwater depth drive trait variation at community scale, roles intraspecific interspecific variation. Therefore, this study analyzed specific differences community-weighted mean among habitat types obtained relative contribution...

Populus euphratica is an important tree species in desert ecosystems. The protection and restoration of natural forests requires accurate positioning information. use Sentinel-2 images to map the distribution at a large scale faces challenges associated with discriminating between Tamarix chinensis. To address this problem, study selected Daliyabuyi Oasis hinterland Taklimakan Desert as site sought distinguish from First, we determined peak spectral difference period (optimal time window)...

Understanding the effect of flooding on groundwater quality is imperative for oasis vegetation protection and local ecological environment development. We used geochemical remote sensing inversion methods to evaluate effects flood recharge hydrochemical processes in Daliyaboy Oasis. Groundwater samples were collected from 30 observation wells study area before (PRF) after (POF) flood. Except small changes HCO3− K+ a decrease pH, ion levels higher POF than PRF, water chemistry was essentially...

Beta diversity indicates the species turnover with respect to a particular environmental gradient. It is crucial for understanding biodiversity maintenance mechanisms and prescribing conservation measures. In this study, we aimed reveal drivers of beta patterns in desert hinterland oasis communities by establishing three types surface water disturbance groundwater depth gradients. The results indicated that dominant factor driving pattern within same gradient shifted from soil organic matter...

Surface water is an important factor affecting vegetation change in desert areas. However, little research has been conducted on the effects of surface expansion. In this study, annual spatial distribution range and Daliyabuyi Oasis from 1990 to 2020 was extracted using Landsat time-series images. Based multi-temporal multi-scale remote sensing images, several plots were selected demonstrate process landform expansion, influence expansion analyzed. The results show that coverage have...

The present paper combined the natural environment excitation technology (NExT) with eigen system realization algorithm (ERA) to identify modal parameters of a suspension bridge. Firstly, critical in NExt–ERA, such as record length, window and ranks Hankel matrix, their influence on identification accuracy have been discussed. Subsequently, based acceleration series obtained from Xihoumen Bridge Health Monitoring System, 3015 sets frequencies damping ratios were identified under 7 wind...

Warming and persistent droughts may exacerbate drought stress in water-scarce areas, thereby negatively affecting tree growth. When riparian plants arid regions experience severe stress, they sacrifice non-dominant branches with less competitive sap flow to improve the of dominant thus ensure strong plant Populus euphratica is one most species forest ecosystems inland river basins zones a reliable indicator ecological change because its diversity growth environment. To understand...

It is highly necessary to apply unmanned aerial vehicle (UAV) remote sensing technology forest health assessment. To prove the feasibility of quantitative inversion photosynthetic pigment content (PPC) in Populus euphratica Oliv. individual tree canopy (PeITC) by using multispectral UAV images, this study, Parrot Sequoia+ system was manipulated collect images (Populus Oliv.) sample plots Daliyabuyi Oasis from 2019 2020, and PPCs five trees per plot were determined six plots. The crown...

Canard Rotor / wing (CRW) aircraft, as a new type of high-speed helicopter, combines the advantages vertical take-off and landing helicopter cruise fixed aircraft. At same time, it also has unique aerodynamic layout, which leads to large coupling interference during is prone accidents. This paper studies flight dynamics modeling control system design CRW aircraft automatic landing. In order obtain model with high reliability, adopts methods mechanism modeling, identification empirical...

The low agricultural productivity and ecological degradation in the majority of northwestern China is mainly attributed to disordered accumulation expansion salinization. Soil salinization has a significant spatial temporal variability. Therefore, it essential reveal variability characteristics control factors soil wet dry seasons understand mechanism occurrence prevent degradation.First, random forest model (RF) was used predict salinity distribution uncertainty at 90-m grid nodes Wei-ku...

Soil is the largest carbon reservoir in terrestrial ecosystems, and thus minor changes it can dramatically affect atmospheric CO concentrations. The fragile ecological environment northwestern arid zone of China susceptible to natural anthropogenic disturbances, which lead variations structure function ecosystem, as well source–sink dynamics. In this study, digital soil maps organic stocks (SOCS) were produced at a 90-m resolution for two periods (the 1980s 2010s) based on historical profile...