[1]HU Yao,LI Yi,HOU Yule.Effects of Land Use Types on Stability and Organic Carbon of Soil Aggregates in Minjiang River Valley[J].Research of Soil and Water Conservation,2018,25(04):22-29.
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Effects of Land Use Types on Stability and Organic Carbon of Soil Aggregates in Minjiang River Valley
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
25
Number of periods:
2018 04
Page number:
22-29
Column:
Public date:
2018-06-13
- Title:
- Effects of Land Use Types on Stability and Organic Carbon of Soil Aggregates in Minjiang River Valley
- CLC:
- S152
- DOI:
- -
- Abstract:
- In order to study the effect of land use type on stability and organic carbon of soil aggregates in Minjiang River Valley, we selected five land use types of soils, which are abandoned land, secondary forest, scrub-grassland, artificial forest and sloping farmland abandoned land, and then we got the proportions of large macroaggregates (> 2 mm), small macroaggregates (0.25~2 mm), microaggregates (53μm~0.25 mm) and silt+clay (<53 μm) by wet sieving method, and measured the content of organic carbon in each aggregate fraction in 0—30 cm soil depth and calculated the total content of organic carbon of all aggregates fraction in each soil. The results showed that the soil nutrients of these land use types had the same change rule, while the soil phosphorus had no significant difference in these land use types (p>0.05); reclamation of woodland could lead to fragmentation of macroaggregates and deterioration of soil structure, respectively; changing the sloping farmland to abandoned land could lead to the conversion of soil fraction from silt +clay to large macroaggregates and small macroaggregates, which could improve the soil structure, MWD (mean weight diameter) and GMD (geometric mean diameter) are important indicators of evaluating the stability of soil aggregates. We found that the MWD and GWD in 0—30 cm soil depth in sloping farmland were significantly lower than those in woodland (p<0.05), after changing the sloping farmland to abandoned land，the MWD and GWD increased significantly (p<0.05), which indicated that reclamation of woodland could lead to the decrease of stability of soil aggregates. However, after changing the sloping farmland to abandoned land could enhance the stability of soil aggregates, and improve the ability of soil to resist external damage. The organic carbon content in each soil aggregate of four land use types decreased with the increase of soil depth. In soil depth of 0—30 cm, the storage of organic carbon in large macroaggregates in each soil decreased in order: abandoned land > forest > scrub-grassland > sloping farmland, and abandoned land > forest > scrub-grassland > sloping farmland in small macroaggregates, and abandoned land > forest > scrub-grassland > sloping farmland in microaggregates and in silt and clay fraction. Storage of organic carbon in each aggregate in the soils of woodland and abandoned land were higher than those in the soils of sloping farmland, which indicated that reclamation of woodland could lead to a loss of organic carbon in each soil aggregate fraction, changing the sloping farmland to abandoned land could restore and sequestrate the soil organic carbon. In addition，it showed that most organic carbon accumulated in small macroaggregate in soils of woodland and abandoned land, while it was sequestrated in silt and clay in soils of sloping farmland, indicating that organic carbon in larger aggregates is unstable and is easier to convert during the land use change.
- References:
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