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| Vertical distribution characters of typical communities root system in relation to environmental factors in the Hill-gully region of Loess Plateau |
| Wu Chunhua<sup>1,2</sup>,Chen Yunming<sup>1</sup>,Wang Guoliang<sup>1</sup>,Lu Jianli<sup>3</sup> |
| 1.Institute of Soil and Water Conservation,CAS & MWR,712100,Yangling,Shaanxi;2.Graduate School of Chinese Academy of Sciences,100049,Beijing;3.College of Resources and Environment,Northwest A & F University,712100,Yangling,Shaanxi:China |
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Abstract In order to provide scientific basis for vegetation restoration and reconstruction of removal lands in the Hill-gully region of Loess Plateau,the effects of environmental factors on the vertical distribution of root system biomass were studied with the methods of CA and CCA analyses in four typical communities.The results showed that root system biomass of four communities decreased with the increase of soil depth in a similar manner,and 85% root system biomass were concentrated in surface soil layer of 0-40 cm.The distribution of root system in soil profile can be divided into three types: T1,T2 and T3,and root system in most communities belongs to the T1 type in which the roots are concentrated in the top soil layer(0-20 cm),far more than in the lower soil layers;while root systems of types T2 and T3 are imbedded in both top and deep soil layers.Results showed that environmental factors compositively affected the distribution and variety of roots,among which soil water content,bulk density,nitrate nitrogen had main effects.The T1 type distributed in the areas which had more nitrate nitrogen,while the types T2 and T3 distrbuted in places with high content of organic matter and total nitrogen.
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Received: 12 December 2007
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