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Distribution of the glomalin-related soil protein and aggregate fractions in different restoration communities after clear-cutting Pinus tabulaeformis plantation |
JING Hang1, SHI Jun-yi1, WANG Guo-liang1,2, XUE Sha1,2, LIANG Chu-tao2, ZHOU Hao-xiang1 |
1. Institute of Soil and Water Conservation, Northwest A & F University, Yangling 712100, China;
2. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Ministry of Water Resources, Yangling 712100, China |
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Abstract 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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Received: 22 December 2016
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