Temporal stability analysis for estimating spatial mean soil water storage and deep percolation in irrigated maize crops

2014 ◽  
Vol 144 ◽  
pp. 140-149 ◽  
Author(s):  
Danfeng Li ◽  
Ming’an Shao
Keyword(s):  
Stability Analysis ◽  
Soil Water ◽  
Temporal Stability ◽  
Water Storage ◽  
Soil Water Storage ◽  
Deep Percolation

scholarly journals Spatial variability and temporal stability of water storage in a cultivated tropical soil

Bragantia ◽  
2010 ◽  
Vol 69 (suppl) ◽  
pp. 153-162 ◽  
Author(s):  
Antonio Carlos Andrade Gonçalves ◽  
Marcos Antonio Trintinalha ◽  
Marcos Vinicius Folegatti ◽  
Roberto Rezende ◽  
Cássio Antonio Tormena
Keyword(s):  
Water Content ◽  
Soil Water ◽  
High Efficiency ◽  
Temporal Stability ◽  
Water Storage ◽  
Soil Surface ◽  
Soil Water Storage ◽  
Soil Conditions ◽  
Content Uniformity ◽  
Water Application

Irrigated agricultural fields usually show variable crop water demand. If water application is done to match this spatially variable demand, the water use efficiency can be substantially improved. Soil water management by irrigation has been one of the most important factors to increase crop yield. To look for the economic viability of the process, the use of several inputs, particularly water, should be done with high efficiency levels. Historically, irrigation uniformity has been evaluated above the soil surface, in which applied water was the only factor to be taken into account. However, the crop will respond to soil water content uniformity, which can differ from the uniformity of water application. To evaluate temporal stability of spatial pattern of soil water storage (SWS), this work was done on a Brazilian clayed soil. Volumetric water content from soil surface to 0,30m depth, was measured by TDR in 80 points regularly spaced (3 x 3 m) on an experimental area cultivated with bean crop, irrigated by conventional sprinkling. The evaluations were done immediately before and after a water application by irrigation. Experimental semivariograms made from values obtained in the field showed that SWS distribution was spatially structured and strongly stable in time, being regulated mainly by intrinsic factors of the soil. In addition, obtained results showed that water application uniformity did not influence the spatial distribution pattern of SWS in these soil conditions.

Temporal variability of soil water storage evaluated for a coffee field

Soil Research ◽  
2011 ◽  
Vol 49 (1) ◽  
pp. 77 ◽  
Author(s):  
L. C. Timm ◽  
D. Dourado-Neto ◽  
O. O. S. Bacchi ◽  
W. Hu ◽  
R. P. Bortolotto ◽  
...  
Keyword(s):  
Soil Water ◽  
Temporal Stability ◽  
Water Storage ◽  
Soil Water Storage ◽  
Time Analysis ◽  
Sampling Points ◽  
Long Time ◽  
Minimum Number ◽  
Level Of Significance ◽  
Definition Of

Sampling field soils to estimate soil water content and soil water storage (S) is difficult due to the spatial variability of these variables, which demands a large number of sampling points. Also, the methodology employed in most cases is invasive and destructive, so that sampling in the same positions at different times is impossible. However, neutron moderation, time domain reflectrometry, and, more recently, frequency domain reflectrometry methodologies allow measurements at the same points over long time intervals. This study evaluates a set of neutron probe data, collected at 15 positions placed randomly along a coffee crop contour line, over 2 years at 14-day intervals. The temporal stability of S was again demonstrated, so that wetter or dryer locations remain so over time, and the definition of such positions in the field reduces the number of sampling points in future S evaluations under similar conditions. An analysis was made to determine the minimum number of sampling points to obtain the average S of the field within a chosen level of significance. Classical statistical analysis indicated that the 15 measurement positions could be reduced to four or even to one position to obtain a reliable field S average. State–time analysis showed S estimations depend more on previous measurements of rainfall P (52%) than on evapotranspiration ET (28%) and S (20%). The analysis also showed that ET was not realistically estimated from previous measurements of S; it was more dependent on previous measurements of ET (59%) than on P (30%) and S (9%). This statistical procedure showed great advantages over classical multiple regressions. Future studies of this type should be carried out at regularly spaced observation points in a grid, in order to allow a 2-D and 3-D state–space–time analysis.

Temporal stability of soil water storage in multiple soil layers in high-elevation forests

2019 ◽  
Vol 569 ◽  
pp. 532-545 ◽  
Author(s):  
Zhi-Bin He ◽  
Min-Min Zhao ◽  
Xi Zhu ◽  
Jun Du ◽  
Long-Fei Chen ◽  
...  
Keyword(s):  
Soil Water ◽  
Temporal Stability ◽  
Water Storage ◽  
High Elevation ◽  
Soil Water Storage ◽  
Soil Layers ◽  
High Elevation Forests
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