scholarly journals Micro spatial distribution pattern of litterfall and nutrient flux in relation to soil chemical properties in a super wet tropical rain forest plot, West Sumatra, Indonesia

Tropics ◽  
2003 ◽  
Vol 12 (2) ◽  
pp. 131-146
Author(s):  
Tsugiyuki MASUNAGA ◽  
Toshiyuki WAKATSUKI
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Chemical Properties ◽  
Nutrient Flux ◽  
Spatial Distribution Pattern ◽  
Soil Chemical Properties ◽  
Forest Plot ◽  
West Sumatra

scholarly journals Spatial Distribution Pattern of Trees in Relation to Soil Edaphic Status in Tropical Rain Forest in West Sumatra, Indonesia II. Distribution of Non-Accumulating Trees.

Tropics ◽  
1998 ◽  
Vol 8 (1/2) ◽  
pp. 17-30 ◽  
Author(s):  
Tsugiyuki MASUNAGA ◽  
Daisuke KUBOTA ◽  
Usher WILLIAM ◽  
Mitsuru HOTTA ◽  
Yoshiaki SHINMURA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Spatial Distribution Pattern ◽  
West Sumatra

scholarly journals Spatial Distribution Pattern of Trees in Relation to Soil Edaphic Status in Tropical Rain Forest in West Sumatra, Indonesia I. Distribution of Accumulating Trees.

Tropics ◽  
1998 ◽  
Vol 7 (3/4) ◽  
pp. 209-222 ◽  
Author(s):  
Tsugiyuki MASUNAGA ◽  
Daisuke KUBOTA ◽  
Usher WILLIAM ◽  
Mitsuru HOTTA ◽  
Yoshiaki SHINMURA ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Distribution Pattern ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
Spatial Distribution Pattern ◽  
West Sumatra

scholarly journals Spatial relationships between soil attributes and corn yield in no-tillage system

2012 ◽  
Vol 36 (2) ◽  
pp. 599-609 ◽  
Author(s):  
Marcos Sales Rodrigues ◽  
José Eduardo Corá ◽  
Carolina Fernandes
Keyword(s):  
Spatial Distribution ◽  
Soil Properties ◽  
Distribution Pattern ◽  
Crop Yield ◽  
Chemical Properties ◽  
Clay Content ◽  
Soil Characteristics ◽  
Spatial Distribution Pattern ◽  
Corn Yield ◽  
Sampling Intensity

Soil properties play an important role in spatial variability of crop yield. However, a low spatial correlation has generally been observed between maps of crop yield and of soil properties. The objectives of the present investigation were to assess the spatial pattern variability of soil properties and of corn yield at the same sampling intensity, and evaluate its cause-and-effect relationships. The experimental site was structured in a grid of 100 referenced points, spaced at 10 m intervals along four parallel 250 m long rows spaced 4.5 m apart. Thus, points formed a rectangle containing four columns and 25 rows. Therefore, each sampling cell encompassed an area of 45 m² and consisted of five 10 m long crop rows, in which the referenced points represented the center. Samples were taken from the layers 0-0.1 m and 0.1-0.2 m. Soil physical and chemical properties were evaluated. Statistical analyses consisted of data description and geostatistics. The spatial dependence of corn yield and soil properties was confirmed. The hypothesis of this study was confirmed, i.e., when sampling the soil to determine the values of soil characteristics at similar to sampling intensity as for crop yield assessments, correlations between the spatial distribution of soil characteristics and crop yield were observed. The spatial distribution pattern of soil properties explained 65 % of the spatial distribution pattern of corn yield. The spatial distribution pattern of clay content and percentage of soil base saturation explained most of the spatial distribution pattern of corn yield.

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