Soil Aggregate Stability: Its Evaluation and Relation to Organic Matter Constituents and Other Soil Properties
The purpose of this study were: 1) to compare the aggregate stability of individual aggregate size fractions, 2) to determine the interrelationship and efficiency of several aggregate stability indices, and 3) to determine the relationship and importance of organic matter and other soil constitue...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
1996
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10365/1/FP_1996_4_A.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The purpose of this study were: 1) to compare the aggregate stability of
individual aggregate size fractions, 2) to determine the interrelationship and
efficiency of several aggregate stability indices, and 3) to determine the relationship
and importance of organic matter and other soil constituents on aggregate stability.
To compare the aggregate stability of individual aggregate size fractions, a
mathematical model was developed to estimate the breakdown of individual
aggregate size fractions in the wet-sieving (using nested sieves) method. This model
was validated and calibrated by comparing the estimation values to the actual
aggregate breakdown values by paired sample t-test, linear regression and prediction error sum of squares. The average percentage of stable aggregates for all aggregate
size fractions were represented in an index called average intact aggregates (AlA). Factor analysis was used to determine the interrelationship and efficiency of
several aggregate stability indices. Aggregate stability of eight soil samples were
measured with eight indices: percentage of water-stable aggregates >0.3 mm (WSA
>0.3) and >0.5 mm (WSA >0.5), AlA, water-dispersible clay (WDC), waterdispersible
clay and silt (WDCS), mean weight diameter after wet-sieving (MWDw),
turbidity percentage (TP), and clay ratio (CR). |
|---|