In 0～10 cm depth of soil, the increments of >5 mm soil water stable aggregates in sharptooth oak forest, Chinese pine forest and meadow were 27.8%,14.0% and 5.7% respectively, and those of 2~5 mm were 6 0%, 11.1% and 8.6% respectively.
Water-stability aggregate was positive correlated with organic content at r2 =0.9251. By six kind of fertilization treatments with equivalent N content, NO3-N content with only N fertilizer utilization were 2.9, 1.8 and 1.6 times higher than that in N+ organic fertilizer, NPK and NP treatments.
In comparison of the tested materials, the highest values in SQ, A% and WMWD associated with M-PAM (polyacrylamide) surface treatment showed that MPAM had the strongest effects on film-formation, erosion-resistance, and aggregate water-stability and can be recommended as practices combined with water-saving irrigation and soil conservation tillage in dryland soil.
With CLP (crosslinked polyacrylamide) treatment, the higher A%, but the lower SQ and WMWD suggested that CLP had the weaker wet aggregate water-stability and is suitable for water and fertilizer conservation in seasonal drought soils, and especially is applicable for water-saving cultivation management of cash crops.
Either the water-stability of aggregates (especially >2mm ) or the content of water-stable aggregates is highly correlated with the contents of soil organic matter. This result shows that organic matter is the cementation of soil aggregate structure.
Correlative analysis indicated content of soil water-stable aggregates(>0.25 mm) is in high correlation with content of organic matter of soil and yield of corns,and their correlative coefficients are 0.860 and 0.703 respectively.
The higher the inoculation rate,the higher the hyphal desity. Mycorrhizal hyphal contribution to the formation of water-stable soil aggregates of 5～2 mm was 100% within the distance of 4～6 cm from the root surface,however not within the distance of 0～2 or 2～4 cm.
The content of water stable aggregates in 18-year-old shrub land soil is higher than the 8-year-old shrub land, and the big aggregates (>amp;gt;5 mm) increased for the most part, by 67.4% and 59.0% in different layers, respectively.
The number of soil granular aggregates or the water stable aggregates under corylus clusters is more than that under the non-corylus clusters.
The influence of earthworms was determined by comparing soil aggregates and casts with respect to dry and moist porosity, swelling, and water stable aggregation.
In low P soils, however, a positive relation between the abundance of water stable soil aggregates in the 0.5-2?mm diameter range and RTI was most important.
The influence of water stable aggregation of soil on RTI was modulated by soil P levels.
Biomass of fine roots and its relationship with water-stable aggregates in a composite ecosystem of triploid Populus tomentosa i
A study on the biomass of fine roots and its relationship with water-stable aggregates (WSA) was conducted in two herbaceous models, triploid Populus tomentosa + Lolium multiflorum (TL) and triploid P.
The amounts of water-stable aggregates of natural grass-forest lands (TN model) were higher than those of managed grass-forest lands (TL model).
Two-way analysis of variance indicated that fine roots (≤ 1 mm) could significantly enhance water-stable aggregates and total water-stable aggregates.
Mineralogy of the clay fraction of water-stable aggregates from dark gray forest soil