| Study on effects of different vegetation types on soil aggregate water stability based on LB method |
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| DOI：10.7606/j.issn.1000-7601.2010.02.40 |
| Key Words: soil aggregate water stability fractal dimension mean weight diameter geometric mean diameter |
| Author Name | Affiliation | | DONG Lili | College of Tourism and Environment，Shaanxi Normal University, Xi'an，Shaanxi 710062, China | | ZHENG Fenli | College of Resources and Environment，Northwest A&F University, Yangling, Shaanxi 712100, China
The State Key Laboratory of Soil Erosion and Dry land Farming on Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Science and Ministry of Water Resource, Yangling, Shaanxi 712100, China | | QIN Ruijie | College of Resources and Environment，Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Soil aggregate is crucial to soil erosion and runoff. The fast wetting of Le Bissonnais method was used to measure the content of soil water stable aggregate and samples were collected from Zhifanggou catchment of the Loess hilly-gully region. The mean weight diameter (MWD), geometric mean diameter (GMD) and mass frac
tal dimension (D) of soil aggregates were calculated and correlations among these indexes were analyzed. The effects of vegetation types on the content of soil water stable aggregates were studied. The results indicate that the biggest content of ＞0.2 mm soil aggregate is 54.95% in the 0～5cm of Chinese pine forest restored in 1978 year land and the smallest is 3.20% in the 20～40 cm of black locust forest land restored in 1990 year and abandoned land; The biggest of MWD(mm) and GMD(mm) are 1.66 and 0.46 respectively in the 0～5 cm of Chinese pine forest land restored in 1978 year and the smallest of them are 0.09 and 0.05 respectively in the 20～40 cm of abandoned land. D of topsoil (0～5 cm) and subsoil(5～20 cm) are 2.71～2.84 and 2.74～2.91 respectively. ＞0.2 mm, MWD, GMD and D correlate significantly with soil organic matter, which indicate that increasing the content of soil organic matter can improve soil aggregate formation and soil aggregate water stability. D, MWD, GMD and ＞0.2 mm can indicate soil aggregate water stability and are the indicators of the soil anti-erodibility. |
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