The objectives of this study were to evaluate the soil aggregate stability, distribution of glomalin-related soil
protein (GRSP) and soil organic carbon (SOC) in different size aggregates from three restoration communities (young
plantation land, shrub land and abandoned forestland) after clear-cutting Pinus tabulaeformis plantation, undisturbed
Pinus tabulaeformis plantation were control treatment. The results showed that soil aggregates were dominated by macro
aggregate (>250μm). Aggregate stability were significantly different among those restoration communities (P<0.05). The
soil aggregate stability in young plantation land was significantly lower than that in the control treatment, while the
aggregate stability in shrub land and abandoned forestland were significantly higher than those in the control treatment.
Content of easily extractable GRSP (EE-GRSP) had similar changes with aggregate stability among all restoration
communities; Content of total GRSP (T-GRSP) in shrub land significant higher than that in the control treatment. On the
other hand, the content of EE-GRSP in clay-silt aggregate (<53μm) was highest than other size aggregates, while the
content of T-GRSP in micro aggregate (53~250μm) was the highest than other size. The aggregate stability significantly
varied among restoration communities, and the changes of EE-GRSP content was consistent with aggregate stabilities
among restoration communites. Our results indicated content of T-GRSP in macro aggregate was a better index to reflect
SOC pool than those in other size aggregates. Moreover, the aggregate stability was mainly depending on the GRSP in
macro aggregate.
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