Temporal and spatial variation of rainfall erosivity in the Loess Plateau of China and its impact on sediment load

CATENA ◽  
2022 ◽  
Vol 210 ◽  
pp. 105931
Author(s):  
Lu Jia ◽  
Kun-xia Yu ◽  
Zhan-bin Li ◽  
Peng Li ◽  
Jun-zheng Zhang ◽  
...  
Keyword(s):  
Spatial Variation ◽  
Loess Plateau ◽  
Sediment Load ◽  
Rainfall Erosivity ◽  
The Loess Plateau ◽  
Temporal And Spatial Variation ◽  
Temporal And Spatial

scholarly journals Temporal and spatial variation of soil moisture of small watershed in gully catchment of the Loess Plateau of China

2019 ◽  
Vol 118 ◽  
pp. 01009
Author(s):  
Qiguang Dong ◽  
Jichang Han ◽  
Na Lei ◽  
Jing He ◽  
Zenghui Sun ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Spatial Variation ◽  
Loess Plateau ◽  
Coefficient Of Variation ◽  
Degrees Of Freedom ◽  
Model Parameters ◽  
Small Watershed ◽  
The Loess Plateau ◽  
Temporal And Spatial Variation ◽  
Temporal And Spatial

The temporal and spatial variation characteristics of soil moisture in typical slope and gully of Jiulongquangou small watershed were studied in the hilly and gully region of the Loess Plateau of China. The variation of soil moisture in the 0-30 cm layer on the surface of the hilly and gully region of the Loess Plateau is greater than the variation of soil moisture in each layer between 40 and 100 cm. In the study area, the model parameters such as coefficient of variation (Cv), nugget (C0), sill (C0+C), spatial degrees of freedom(C0/(C+C0)) and variable change can be used to quantitative analysis the spatial varying law. On the slope surface, the average soil water content and the coefficient of variation are negatively correlated, and can be approximated by an exponential function, while the two are positively correlated in the gully.

scholarly journals Phylogenetic paleoecology: macroecology within an evolutionary framework

Paleobiology ◽  
2021 ◽  
Vol 47 (2) ◽  
pp. 171-177
Author(s):  
James C. Lamsdell ◽  
Curtis R. Congreve
Keyword(s):  
Species Diversity ◽  
Spatial Variation ◽  
Geographic Distribution ◽  
Evolutionary Biology ◽  
Phylogenetic Signal ◽  
Evolutionary Rates ◽  
The Other ◽  
Ecological Data ◽  
Temporal And Spatial Variation ◽  
Temporal And Spatial

The burgeoning field of phylogenetic paleoecology (Lamsdell et al. 2017) represents a synthesis of the related but differently focused fields of macroecology (Brown 1995) and macroevolution (Stanley 1975). Through a combination of the data and methods of both disciplines, phylogenetic paleoecology leverages phylogenetic theory and quantitative paleoecology to explain the temporal and spatial variation in species diversity, distribution, and disparity. Phylogenetic paleoecology is ideally situated to elucidate many fundamental issues in evolutionary biology, including the generation of new phenotypes and occupation of previously unexploited environments; the nature of relationships among character change, ecology, and evolutionary rates; determinants of the geographic distribution of species and clades; and the underlying phylogenetic signal of ecological selectivity in extinctions and radiations. This is because phylogenetic paleoecology explicitly recognizes and incorporates the quasi-independent nature of evolutionary and ecological data as expressed in the dual biological hierarchies (Eldredge and Salthe 1984; Congreve et al. 2018; Fig. 1), incorporating both as covarying factors rather than focusing on one and treating the other as error within the dataset.

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