Drought monitoring in arid and semi-arid region based on multi-satellite datasets in northwest, China

2021 ◽  
Author(s):  
Wei Wei ◽  
Haoyan Zhang ◽  
Junju Zhou ◽  
Liang Zhou ◽  
Binbin Xie ◽  
...  
Keyword(s):  
Arid Region ◽  
Northwest China ◽  
Drought Monitoring ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Changes in soil physicochemical properties and soil bacterial community in alfalfa (Medicago sativa L.) / oat (Avena nuda L.) intercropping system

2021 ◽  
Author(s):  
Xiaojing Liu ◽  
Yajiao Zhao ◽  
Changchun Tong ◽  
Yong Wu
Keyword(s):  
Bacterial Community ◽  
Arid Region ◽  
Rhizosphere Soil ◽  
Soil Health ◽  
Illumina Miseq ◽  
Northwest China ◽  
Carbonate Content ◽  
Effective Measure ◽  
Semi Arid Region ◽  
Semi Arid

Abstract Aims Semi-arid region in northwest China is characterized by barren soil, high soil pH and high carbonate content.Methods In order to improve the soil health status in this area, we studied the effects of alfalfa/oat intercropping on rhizosphere soil nutrients and bacterial community by Illumina MiSeq technology in the 3rd year.Results The results showed that SOM significantly increased in the rhizosphere soil of intercropped compared with monoculture. AN, AP and AK of intercropping were significantly higher than those of monoculture of oat. Bacterial reads number, population taxonomic unit, richness and diversity all showed that intercropping were greater than monoculture. In terms of bacterial phylum, Proteobacteria, Bacteroidetes, Chloroflexi, Actinobacteria, Planctomycetes and Acidobacteria were dominant populations. The abundances of Proteobacteria, Acidobacteria, Cyanobacteria and Gemmatimonadetes were greater in intercropping systems than that in monoculture systems. At genus level, Opitutus, Pseudomonas, Gemmatimonas and Flavobacterium in intercropping were all higher than those in monoculture. At the same time, proteobacteria, bacteroidetes and actinobacteria were significantly positively correlated with SOM, TN and AN.Conclusions This result indicated that alfalfa/oat intercropping can reduce the pH and significantly improve the microbial environment and nutrients of rhizosphere soil in northwest semi-arid region. Meanwhile, the rhizosphere soil microbial community and nutrients interact and regulate each other. Therefore, alfalfa/oat intercropping is an effective measure that improve soil environment in northwest semi-arid region.

scholarly journals Drivers and Environmental Impacts of Vegetation Greening in a Semi-Arid Region of Northwest China since 2000

2021 ◽  
Vol 13 (21) ◽  
pp. 4246
Author(s):  
Zhenzong Wu ◽  
Jian Bi ◽  
Yifei Gao
Keyword(s):  
Arid Region ◽  
Vegetation Index ◽  
Climatic Factors ◽  
Agricultural Practices ◽  
Northwest China ◽  
Terrestrial Vegetation ◽  
Moderate Resolution Imaging Spectroradiometer ◽  
Semi Arid Region ◽  
Semi Arid ◽  
Dynamics Of Vegetation

The dynamics of terrestrial vegetation have changed a lot due to climate change and direct human interference. Monitoring these changes and understanding the mechanisms driving them are important for better understanding and projecting the Earth system. Here, we assessed the dynamics of vegetation in a semi-arid region of Northwest China for the years from 2000 to 2019 through satellite remote sensing using Vegetation Index (VI) data from the Moderate Resolution Imaging Spectroradiometer (MODIS), and analyzed the interannual covariation between vegetation and three climatic factors—air temperature, precipitation, and vapor pressure deficit (VPD)—at nine meteorological stations. The main findings of this research are: (1) herbaceous land greened up much more than forests (2.85%/year vs. 1.26%/year) in this semi-arid region; (2) the magnitudes of green-up for croplands and grasslands were very similar, suggesting that agricultural practices, such as fertilization and irrigation, might have contributed little to vegetation green-up in this semi-arid region; and (3) the interannual dynamics of vegetation at high altitudes in this region correlate little with temperature, precipitation, or VPD, suggesting that factors other than temperature and moisture control the interannual vegetation dynamics there.

Accessing the Urbanization Impacts on Township Environment in Semi-Arid Region of Northwest China by Multi-Disciplined Methods

2013 ◽  
Vol 726-731 ◽  
pp. 4875-4878
Author(s):  
Lei Gu ◽  
Yong Chun Yang ◽  
Hao Xu Li ◽  
Hou Rui Zhang ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Landscape Change ◽  
Arid Region ◽  
Northwest China ◽  
The Earth ◽  
Bird Survey ◽  
Process Of Urbanization ◽  
Ecosystem Transformation ◽  
Semi Arid Region ◽  
Semi Arid

The process of urbanization has significant and various impacts on the environment of the earth, either positive or negative. In this paper, multi-disciplined methods such as GIS and bird survey were used to monitor the landscape change and ecosystem transformation by urbanization. The case study in Xiaguanyin Town of Northwest China demonstrated that urbanization can probably have positive environmental influences on a relatively arid place.

scholarly journals Dust aerosol effect on semi-arid climate over Northwest China detected from A-Train satellite measurements

2010 ◽  
Vol 10 (14) ◽  
pp. 6863-6872 ◽  
Author(s):  
J. Huang ◽  
P. Minnis ◽  
H. Yan ◽  
Y. Yi ◽  
B. Chen ◽  
...  
Keyword(s):  
Optical Depth ◽  
Liquid Water ◽  
Arid Region ◽  
Northwest China ◽  
Arid Climate ◽  
Dust Event ◽  
Anthropogenic Aerosols ◽  
Source Regions ◽  
Semi Arid Region ◽  
Semi Arid

Abstract. The impact of dust aerosols on the semi-arid climate of Northwest China is analyzed by comparing aerosol and cloud properties derived over the China semi-arid region (hereafter, CSR) and the United States semi-arid region (hereafter, USR) using several years of surface and A-Train satellite observations during active dust event seasons. These regions have similar climatic conditions, but aerosol concentrations are greater over the CSR. Because the CSR is close to two major dust source regions (Taklamakan and Gobi deserts), the aerosols over the CSR not only contain local anthropogenic aerosols (agricultural dust, black carbon and other anthropogenic aerosols), but also include natural dust transported from the source regions. The aerosol optical depth, averaged over a 3-month period, derived from MODIS for the CSR is 0.27, which is 47% higher than that over the USR (0.19). Although transported natural dust only accounts for 53% of this difference, it is a major contributor to the average absorbing aerosol index, which is 27% higher in the CSR (1.07) than in the USR (0.84). During dust event periods, liquid water cloud particle size, optical depth and liquid water path are smaller by 9%, 30% and 33% compared to dust-free conditions, respectively.

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