TY  - JOUR
T1  - Percent Clay, Aggregate Size Distribution and Stability with Depth along a Toposequence Formed on Coastal Plain Sands
AU - , R.C. Eneje AU - , Ndu Adanma 
JO  - Online Journal of Earth Sciences
VL  - 1
IS  - 2
SP  - 108
EP  - 112
PY  - 2007
DA  - 2001/08/19
SN  - 1991-7708
DO  - ojesci.2007.108.112
UR  - https://makhillpublications.co/view-article.php?doi=ojesci.2007.108.112
KW  - Toposequence
KW  -aggregation
KW  -percent clay
KW  -soil profile
KW  -coastal plain sand
AB  - We studied the distribution of clay and its effects on aggregate size distribution and stability along a toposequence formed from coastal plain sand in a tropical ecosystem, the distribution of percent clay with depth; 0-15, 15-30, 30-45 and 45-60cm was related to changes in soil aggregation. Results showed that topo position, and depth of soil significantly alone and interactively affected percent clay distribution and soil aggregation at p< 0.01. Topo position explained about 80% of  the  differences  in  clay  content at shallow soil depth (0-30cm), while deeper in the soil profile (30-60 cm) it explained between 50-70% of the differences in clay content. Topo position explained over 70% of the trend in aggregate size distribution deeper in the soil profile (30-60 cm), but contributed less than 50% in affecting the trend in aggregate size distribution at the shallow depth. The effect of topo position was higher (about 70%) in influencing aggregation at micro aggregate level (< 0.6 mm), than (50%) in the macro aggregate level (>1mm) irrespective of soil depth.
ER  -