Detecting Historical Vegetation Changes in the Dunhuang Oasis Protected Area Using Landsat Images

Zhang, Xiuxia; Xie, Yaowen

doi:10.3390/su9101780

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…To investigate the reaction order of lactone formation, we used TgnA‐R1 as a model peptide. As the reaction intermediate with one ester bond is observed with MALDI (Figure S10A), we know that the enzyme reaction is distributive like those of microviridin and plesiocin . In HPLC analysis of the core peptide of the partially hydrolyzed mTgnA‐R1, two hydrolysis intermediates with the intact inner or outer ring were detected at different retention times, around 30.5 min and 36.5 min, respectively (Figure A).…”

Section: Resultsmentioning

confidence: 95%

“…Plesiocin was the first example that presents a totally different core motif and ring topology with the same type of macrocycles as those of microviridins. Although there was a recent report that has biochemically characterized microviridins with multiple core peptides, plesiocin has been the only microviridin‐like RiPP in which the full connectivity of multiple core repeats was determined. Here, following the microviridin and plesiocin groups, we present the third distinct group of the microviridin‐like RiPPs with multiple core repeats by determining the full crosslinking connectivity and biosynthetic properties.…”

Section: Introductionmentioning

confidence: 99%

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A Topologically Distinct Modified Peptide with Multiple Bicyclic Core Motifs Expands the Diversity of Microviridin‐Like Peptides

et al. 2019

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Microviridins are ribosomally synthesized and post‐translationally modified peptides (RiPPs) that contain multiple intramolecular ω‐ester or ω‐amide crosslinks between two side chains in peptides. This type of the side‐to‐side macrocyclization may generate diverse structures with distinct topology and ring sizes, but the majority of the microviridin‐like RiPPs present only a single consensus sequence with a tricyclic architecture. Here, we expanded the natural diversity of the microviridin‐like modified peptides by determining the crosslinking connectivity of a new modified peptide, mTgnA and its homologous RiPPs, which we named the thuringinin group. Members of the thuringinin group have core motifs with a distinct consensus sequence, which is transformed to a novel hairpin‐like bicyclic structure by the cognate ATP‐grasp enzyme. We suggest that the microviridin‐like RiPPs naturally have novel sequences and architectures beyond those found in microviridins and comprise a larger RiPP family, termed omega‐ester containing peptides (OEPs).

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Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

A Topologically Distinct Modified Peptide with Multiple Bicyclic Core Motifs Expands the Diversity of Microviridin‐Like Peptides

et al. 2019

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“…Hexi Corridor is located in the northwest of China, composed of three inner river basins named Shiyang River Basin (SYRB), Heihe River Basin (HHRB), and Shule River Basin (SLRB). However, due to the disorganized, ineffective exploitations in the past decades, the ecological degradation including but not limited to the land desertification, soil salinization, declining in the groundwater table, and vegetation coverage decreases, became the most severe environmental issues, which refers to a deterioration in the functioning and productivity of an oasis ecosystem 12 – 15 . Zhang and Xie 15 reported that from 1986 to 2015, the positive changes of oases in Dunhuang in SLRB dominated the overall change trend, where the observed changes were mainly distributed at the periphery of artificial oases located outside the reserve.…”

Section: Introductionmentioning

confidence: 99%

“…Xie, et al 16 reported that the total area of oases in HHRB dramatically expanded by 60% from 1963 to 2013. Several attempts have been conducted to analyze the distribution and the changes of oases in the individual basin, e.g., SLRB 15 , the HHRB 16 , the SYRB 17 , 18 . The previous investigations of oasis changes mainly focused on a single watershed or even a smaller area, such as part of a watershed 18 in these arid regions.…”

Section: Introductionmentioning

confidence: 99%

The constraints and driving forces of oasis development in arid region: a case study of the Hexi Corridor in northwest China

Bie

Xie

2020

Sci Rep

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The oasis, a special landscape with the integration of nature and humanity in the arid region, has undergone an enormous transformation during the past decades. To gain a better understanding of the tradeoff between economic growth and oases stability in the arid land, we took the oases in the Hexi Corridor as a case to explore the constraints of oases development and the driving factors of oases expansion. The dynamic changes and spatial distribution patterns underwent by the oases were examined using multispectral remote sensing imagery. The constraints of oasis development in arid land were investigated by the grid-transformed model, as well as the index system of driving forces was analyzed using the grey incidence model based on the data from statistics yearbooks. The oasis area in the Hexi Corridor had tremendous changes expanded 40% from 1986 to 2015, the stable oasis area was 9062 km2, while the maximum area reached 16,374 km2. The constraints for oases of topography, hydrology and heat condition are as follow: The elevation of oasis ranged from 1000 to 1800 m, peaked in 1500 m; the slope of oasis distribution was flatter than 3 degrees; the aspect of oases on slope land concentrated in northeast and north, accounting for more than 60%. The main driving forces of oasis spatial expansion in the arid region were population, water resource, economy, policies, and other factors. These results are expected to (1) improve the rationality of oasis development, and (2) promote the sustainable planning and management of oases in the arid land.

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“…With the development of the oases of Hexi Corridor, the scale and landscape pattern of the oases had undergone tremendous changes, and the spatial and temporal distribution of water resources had changed. The wetlands had shrunk, natural vegetation had decreased, and land desertification and salinization had become more and more serious [9][10][11][12]. Understanding the ecological environment of the Hexi oases is of great significance to regional ecological environment construction and sustainable development.…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Dynamics of Environmental Status Based on a Remote Sensing Ecological Distance Index (RSEDI) in the Oases of Hexi Corridor in Northwest China

Guo¹,

Zhao²,

Wang³

et al. 2021

Pol. J. Environ. Stud.

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The Hexi Corridor is a typical ecologically fragile and sensitive area, and the oases areas in the middle are the core area of the economic development of the Hexi Corridor, where the ecological problems are most serious. It is of great significance for regional ecological environment construction and sustainable development to clarify the ecological environment status and its change distribution of the Hexi oases areas. This study used remote sensing ecological distance index (RSEDI) model to generate time series of various environmental indexes of the Hexi oases areas from 1986 to 2020, based on Landsat TM/OLI images. And the changes of ecological environment were quantitatively analyzed by employing the coefficient of variation, Theil-Sen median trend analysis and the Mann-Kendall test, and Hurst index method. Results showed that: (1) The mean value of RSEDI of Hexi oases showed an increasing trend, increasing from 0.386 in 1986 to 0.405 in 2020. (2) The ecological environment changes of the Hexi oases were relatively stable, areas with low coefficients of variation accounted for 62.70%. (3) The ecological improvement areas (26.53%) were smaller than the ecological decline areas (30.83%), and areas with no change accounted for 42.62%. (4) 75.14% of areas were persistent, showing the ecological environment changes had strong sustainability. The areas with persistence and improvement accounted for 20.72%, which were distributed throughout the study area, mostly around the periphery of artificial oasis such as Shandan, and Yongchang. The areas with persistence and degradation accounted for 21.55%, which were concentrated in the middle of the study area, mainly

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Detecting Historical Vegetation Changes in the Dunhuang Oasis Protected Area Using Landsat Images

Cited by 6 publications

References 34 publications

A Topologically Distinct Modified Peptide with Multiple Bicyclic Core Motifs Expands the Diversity of Microviridin‐Like Peptides

A Topologically Distinct Modified Peptide with Multiple Bicyclic Core Motifs Expands the Diversity of Microviridin‐Like Peptides

The constraints and driving forces of oasis development in arid region: a case study of the Hexi Corridor in northwest China

Spatio-Temporal Dynamics of Environmental Status Based on a Remote Sensing Ecological Distance Index (RSEDI) in the Oases of Hexi Corridor in Northwest China

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