Comparison of soil organic matter, bulk density and clay content in small watersheds under  different ecological managements of Loess Plateau, China.

doi:10.13287/j.1001-9332.201902.013

Abstract

Abstract: To explore the effects of small watersheds with different ecological managements on soil properties, the spatial differences of soil organic matter (SOM), bulk density (BD), and clay content (CC) in the four facets, including slope aspect, slope position, zone, and soil layer, were analyzed between Yangjiagou (YJG, artificial Robinia pseudoacacia forest watershed) and Dongzhuanggou (DZG, closed grassland watershed). The results showed that SOM, BD and CC were 12.78 g·kg^-1, 1.24 g·cm^-3, 19.2% for YJG and 11.13 g·kg^-1, 1.21 g·cm^-3, 18.2% for DZG, respectively. The values for YJG were slightly higher than those for DZG, but the difference was insignificant. All indices in the east slope were bigger than those in the west slope. Across different slope positions, the variation of BD was small, SOM and CC showed increasing trends from top to bottom. BD and CC declined downward the watershed, whereas SOM changed in an opposite trend. From the soil surface down to 60 cm soil depth, BD and CC increased and SOM decreased. The spatial sensitivity followed CC > SOM > BD, and the effects of the spatial factors can be ordered as soil layer > zone > slope aspect > slope position. There were significant differences in CC of the upper reaches, BD and CC of the middle reaches between the two basins. The sensitivity of each index to slope position, zone and soil layer in YJG was lower than that in DZG.

Key words: ecological management, small watershed, soil bulk density, clay content, soil organic matter

HUANG Yan-li, LI Zhan-bin, SU Hui, WANG Shan-shan, LI Yao-lin, LIU Chen-guang. Comparison of soil organic matter, bulk density and clay content in small watersheds under different ecological managements of Loess Plateau, China.[J]. Chinese Journal of Applied Ecology, 2019, 30(2): 370-378.

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Comparison of soil organic matter, bulk density and clay content in small watersheds under different ecological managements of Loess Plateau, China.

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