Plant Soil Environ., 2014, 60(1):21-26 | DOI: 10.17221/353/2013-PSE

Soil structure and carbon distribution in subsoil affected by vegetation restorationOriginal Paper

F.Z. Zhao1,2, X.H. Han1,2, G.H. Yang1,2, Y.Z. Feng1,2, G.X. Ren1,2
1 Collegeof Agronomy, Northwest A&F University, Yangling, P.R. China
2 Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling, P.R. China

The depth of sampling is an important factor for evaluating soil stability. The objective of this study was to test soil aggregate particle-size fractions and soil organic carbon (SOC) in water-stable aggregate by vegetation restoration through 0-60 cm soil profile. We collected soil samples in 30 years old Robinia psendoacacia (Rr); Platycladus orientalis (Po); Pinus tabulaeformis (Pt); abandoned land (Ab), and slope cropland (Sc), which were separated into > 2, 2-1, 1-0.25, 0.25-0.053, and < 0.053 mm fractions. The > 0.25 mm water-stable aggregates (WSA) and mean weight diameter (MWD) were calculated in 0-60 cm soil depth. Results showed that soil aggregate fractions (> 0.25 mm) of four vegetation types were significantly (P < 0.05) higher in 40-60 cm soil depth under Po, Pt, and Ab compared with Sc and the SOC distribution in macro-aggregates (> 0.25 mm) under Rr, Po, Pt, and Ab was higher more than 37.7, 92.4, 92.5, 79.1%, respectively in 40-60 cm compared with Sc additionally, > 0.25 mm WSA and MWD was significantly higher in Pt soil in 20-40 cm, 40-60 cm soil depth (P < 0.05). The results demonstrated that soil stability was enhanced and SOC content was increased after converting slope cropland to forest, especially under Pt forest that greatly influenced the subsoil.

Keywords: grain to green program; soil depth; soil aggregate; soil organic carbon; Loess Plateau

Published: January 31, 2014  Show citation

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Zhao FZ, Han XH, Yang GH, Feng YZ, Ren GX. Soil structure and carbon distribution in subsoil affected by vegetation restoration. Plant Soil Environ. 2014;60(1):21-26. doi: 10.17221/353/2013-PSE.
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