Single-sensor field experiments in the Tarim basin, western China

2018 ◽  
Author(s):  
Yimou Liu ◽  
Yi Zhou ◽  
Xianghao Liang ◽  
Xueqiang Chen ◽  
Naijian Wang
Keyword(s):  
Tarim Basin ◽  
Field Experiments ◽  
Western China ◽  
Sensor Field ◽  
Single Sensor

Single-sensor seismic acquisition in the mountainous areas of Tarim basin, western China

2017 ◽  
Author(s):  
Xianghao Liang ◽  
Yi Zhou ◽  
Yimou Liu* ◽  
Youhui Huang ◽  
Xindong Zhang ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Western China ◽  
Mountainous Areas ◽  
Seismic Acquisition ◽  
Single Sensor

scholarly journals Nitrogen management in wheat based on the normalized difference vegetation index (NDVI)

2018 ◽  
Vol 48 (9) ◽  
Author(s):  
André Luis Vian ◽  
Christian Bredemeier ◽  
Marcos Alexandre Turra ◽  
Cecília Paz da Silva Giordano ◽  
Elizandro Fochesatto ◽  
...  
Keyword(s):  
Technical Efficiency ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Field Experiments ◽  
Shoot Biomass ◽  
Sensor Field ◽  
N Dose ◽  
Plant Emergence ◽  
The Moment ◽  
The Relationship

ABSTRACT: Biomass production and nitrogen (N) accumulated in wheat shoots may be used for quantifying optimal topdressing nitrogen doses. The objective of this study was to develop and validate models for estimating the amount of biomass and nitrogen accumulated in shoots and the N topdressing dose of maximum technical efficiency in wheat using the normalized difference vegetation index (NDVI) measured by an active optical canopy sensor. Field experiments were carried out in two years and treatments consisted of N doses applied at plant emergence and as topdressing. NDVI, shoot biomass and N accumulated in shoots at the growth stage of six fully expanded leaves and grain yield were evaluated, being determined the topdressing N dose of maximum technical efficiency (DMTE). The NDVI was positively correlated to shoot biomass and N content in shoots and models for the relationship between these variables were developed and validated. The DMTE was negatively correlated with the NDVI value evaluated at the moment of N topdressing application. Thus, NDVI evaluation by an active optical canopy sensor can be used for nitrogen fertilization in variable rate, allowing the adjustment of applied N doses in different areas within a field.

Geophone array vs single sensor field data case study in Pannonian Basin

2019 ◽  
Author(s):  
M. Vanić ◽  
A. Saprygin ◽  
S. Milojević ◽  
I. Bogatyrev ◽  
A. Polivakho
Keyword(s):  
Field Data ◽  
Pannonian Basin ◽  
Sensor Field ◽  
Single Sensor

Genetic diversity patterns in an endangered desert shrub from north-western China: implications for conservation

2019 ◽  
Vol 67 (7) ◽  
pp. 571
Author(s):  
Zhihao Su ◽  
Liuqiang Wang ◽  
Li Zhuo ◽  
Xiaolong Jiang ◽  
Wenjun Li
Keyword(s):  
Genetic Diversity ◽  
Tarim Basin ◽  
Dna Sequences ◽  
Gene Diversity ◽  
Isolation By Distance ◽  
In Situ Conservation ◽  
Western China ◽  
Niche Modelling ◽  
Diversity Patterns ◽  
North Western

Tamarix taklamakanensis is an endangered shrub endemic to the Tarim Basin and adjacent Kumtag Desert in north-western China. Here, we used two chloroplast DNA sequences, namely, psbA-trnH and trnS-trnG, to examine the genetic diversity patterns of this species across its entire covered range. A total of nineteen haplotypes were detected. The total gene diversity within the species is high. Genetic variation mainly occurred among populations, SAMOVA groups, and geographic regions. The test for isolation-by-distance showed a significant correlation between genetic and geographical distances, and the genetic landscape shape analysis showed a significant genetic divergence between the Tarim Basin and Kumtag Desert. T. taklamakanensis likely had a potential geographic range during the Last Glacial Maximum period that was much smaller than the present range predicted by ecological niche modelling. The cold and dry climate during the glacial periods of the Quaternary might be a driver of the genetic isolation and divergence detected within T. taklamakanensis, and climatic oscillations might account for the habitat fragmentation of the species. Within the inner of the basin, populations have a higher level of genetic diversity and harbor most of this genetic diversity, thus a nature reserves should be set up in this area for the in situ conservation. In addition, five genetically distinct groups within T. taklamakanensis should be treated as different management units (MUs) when implementing conservation activities.

Recovery of the Cretaceous palaeo‐uplifts and its implications for hydrocarbon systems in the Kuqa Depression, Tarim Basin, western China

2020 ◽  
Vol 55 (12) ◽  
pp. 7872-7891
Author(s):  
Xu Song ◽  
Xiuxiang Lü ◽  
Han Quan ◽  
Xiaoxiao Zhou ◽  
Yao Guan ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Western China ◽  
Kuqa Depression

scholarly journals Onset of permanent Taklimakan Desert linked to the mid-Pleistocene transition

Geology ◽  
2020 ◽  
Vol 48 (8) ◽  
pp. 782-786
Author(s):  
Weiguo Liu ◽  
Zhonghui Liu ◽  
Jimin Sun ◽  
Chunhui Song ◽  
Hong Chang ◽  
...  
Keyword(s):  
Tarim Basin ◽  
Sand Dunes ◽  
Western China ◽  
Taklimakan Desert ◽  
The Tibetan Plateau ◽  
Mountain Glaciers ◽  
Long Period ◽  
Carbonate Carbon ◽  
Eolian Sand ◽  
Desert Landscape

Abstract The initial occurrence of desert landscape or eolian sand dunes is thought to have occurred long before the Pleistocene, and desertification was subsequently enhanced under cold, dusty glacial conditions. However, when and how the desert landscape persisted during both glacial and interglacial periods, defined as “permanent” desert here, remain elusive. Here, we present carbonate carbon isotope and grain-size records from the Tarim Basin, western China, revealing a detailed desertification history for the Taklimakan Desert. Our records demonstrate that after desiccation of episodic lakes at ca. 4.9 Ma, alternations of eolian sand dunes and fluvial and playa-like conditions persisted for a long period until 0.7 Ma in the Tarim Basin. The onset of permanent desert landscape around 0.7–0.5 Ma occurred concurrently with the climatic reorganization across the mid-Pleistocene transition. The occurrence of mountain glaciers on the Tibetan Plateau and atmospheric circulation changes may have controlled the formation and extreme aridification of the permanent desert in inland Asia since the mid-Pleistocene transition.

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