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| Soil chemical properties of microtopography on loess slope in Northern Shaanxi Province |
| Zhang Hongzhi， Zhu Qingke， Zhao Leilei， Kuang Gaoming， Xie Jing， Li Zhen |
| College of Soil and Water Conservation, Beijing Forestry Universiy,100083,Beijing,China |
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Abstract Due to erosion and other reasons, loess slope in Northern Shaanxi occurred unevenness, which formed a variety of microtopography and led to differences in soil chemical properties. The soil chemical properties of the microtopographies were investigated and analyzed in this paper. Results showed that: 1) compared with undisturbed slope, soil chemical properties of five types of microtopography in study area were improved to some extent. Contents of soil organic matters in the 0-20cm soil layer for the five microtopography types were given as follows: collapse> gully, platform and ephemeral gully(EG)>undisturbed slope and scarp. 2) For the five types of microtopography, the distribution of total N agreed with the soil organic matters, and there was no big difference between total P and total K. 3) Except for scarp, available nutrients in collapse, gully, ephemeral gully (EG) and platform were higher than those in undisturbed slope. 4) Cationic exchange capacity decreased with soil depth and performed the order of ephemeral gully(EG)> collapse> gully> undisturbed slope> platform> scarp. There were no significant difference between CaCO3 and pH. 5) From the analysis of grey correlation on the soil chemical properties of three soil layers of the five types of microtopography and undisturbed slope, it can be concluded that the collapse and platform gained the closest correlation, but undisturbed slope and scarp were the worst.
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Received: 24 February 2011
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