AGGREGATION OF A SILTY CLAY LOAM SOIL BY MYCORRHIZAL ONION ROOTS

被引：43

作者：

THOMAS, RS ^{[1
]}

DAKESSIAN, S ^{[1
]}

AMES, RN ^{[1
]}

BROWN, MS ^{[1
]}

BETHLENFALVAY, GJ ^{[1
]}

机构：

[1] USDA ARS, WESTERN REG RES CTR, ALBANY, CA 94710 USA

来源：

SOIL SCIENCE SOCIETY OF AMERICA JOURNAL | 1986年 / 50卷 / 06期

关键词：

FUNGI - Monitoring - STATISTICAL METHODS - Regression Analysis;

D O I：

10.2136/sssaj1986.03615995005000060023x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Onion plants (Allium cepa L. ) inoculated in the root zone with a vesicular-arbuscular mycorrhizal (VAM) fungus, or left uninoculated, were grown in potted soil for 230 d to determine the influence of the VAM fungus (Glomus macrocarpum Tul. and Tul. ) on soil structure. The silty clay loam soil was maintained at a mositure content between 25 and 30%. Paired inoculated ( plus M) and uninoculated ( minus M) plants were harvested (20 pairs over 150 d) beginning 80 d after planting. Relationships between plant, fungal, and soil parameters and changes with time were evaluated by regression analysis. Soil from the plus M treatment was significantly better aggregated, more porous, and had greater water permeability than minus M soil. Root dry mass and VAM hyphal density in the plus M soil were both significantly correlated with the relative abundance of water-stable soil macroaggregates. Correlation of root mass with aggregate anbundance was stronger, however, suggesting that soil changes were mainly mediated by direct root effects of a host plant whose growth was stimulated dramatically by its VAM fungal endophyte.

引用

页码：1494 / 1499

页数：6

共 33 条

[1] RHIZOSPHERE BACTERIAL POPULATION RESPONSES TO ROOT COLONIZATION BY A VESICULAR ARBUSCULAR MYCORRHIZAL FUNGUS [J].