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| Soil moisture and nutrient characteristics of soil and water conservationforests in Loess Plateau of western Shanxi Province |
| Tian Ningning, Zhang Jianjun, Ru Hao, Li Yuting, Ding Yang, Zhang Yanting |
| College of Soil and Water Conversation,Beijing Forestry University, 100083, Beijing, China |
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Abstract In order to explore soil moisture and nutrient characteristics of soil and water conservation forests, we investigated soil moisture, soil nutrients and root density of three types of forests, i. e. ,Pinus tabulaeformis plantation,Robinia pseudoacacia plantation and secondary forest in Loess Plateau of western Shanxi Province, using EnviroSMART soil moisture monitoring system. The results showed that: 1) Theaverage moisture content of 0 -150 cm soil layer in three types of forests was ranked as secondary forest >P. tabulae formisplantation >R. pseudoacacia plantation. 2) In general, the monthly changes of soil moisture in secondary forest and R. pseudoacacia plantation were consistent, while it was more volatile in the P. tabulae formisplantation. The soil moisture contentin secondary forest was higher than that in the R. pseudoacacia plantation.3)The total root density in 0 -30 cm soil layer followed the order of secondary forest >R. pseudoacacia plantation >P. tabulaeformis plantation, and the density decreased with the increase of soil depth. 4) In all the three forest types, there was a significantly negative correlation between soil moisture content and root density in 0 -30 cm soil depth. 5) In the 0 -30 cm depth,the contents of soil organic matters, total phosphorus and total potassium in secondary forest were significantly higher than those in the R. pseudoacacia and P. tabulae formisplantations, with little difference between the latter two types of plantation. 6) Contents of organic matters and total potassium decreased with the increase of soil depth, while no obvious change in total phosphorus content was found with the increase of soil depth in three types of forests.
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Received: 30 June 2014
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