[1]WAN Haixia,MA Fan,XU Hao,et al.Relationship Between Vertical Distribution Characteristics of Roots and Soil Aggregates in Typical Herb Communities in Loess Area of Southern Ningxia[J].Research of Soil and Water Conservation,2019,26(06):80-86,91.
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Relationship Between Vertical Distribution Characteristics of Roots and Soil Aggregates in Typical Herb Communities in Loess Area of Southern Ningxia
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 06
Page number:
80-86,91
Column:
Public date:
2019-10-17
- Title:
- Relationship Between Vertical Distribution Characteristics of Roots and Soil Aggregates in Typical Herb Communities in Loess Area of Southern Ningxia
- Keywords:
- loess hilly area; herb community; root distribution; soil aggregate
- CLC:
- S157
- DOI:
- -
- Abstract:
- In order to reveal the vertical distribution characteristics of roots and their relationship with soil aggregates in typical herb communities in the loess hilly region of southern Ningxia, and to evaluate the effects of native herb roots on the development of aggregates preliminarily, five typical herb communities (Lespedeza bicolor, Thymus mongolicus, Potentilla acaulis, Artemisia scoparia, Stipa bungeana) were selected to study the vertical distribution characteristics of herb roots, the composition and stability of soil aggregate, and the relationship between roots and soil aggregate. The results showed that the root biomass, root length densities and surface area densities of five types of herbs were 0.44~2.11 g/m3, 0.31~3.51 cm/m3, 0.04~1.10 cm2/m3, respectively, these three indicators gradually decreased with the depth of soil layer, and they mainly distributed in the surface layer. The contents of >5 mm soil aggregates were the greatest, ranged from 4.44% to 67.80%, and increased by 17.5%~50.4% in the communities except Artemisia scoparia compared with the bare land, followed by <0.25 mm aggregates, the contents of the other aggregates were the lest (<5%). The R0.25 contents, MWD and GMD values of soil aggregate in 0-30 cm soil layer were 52.03%~84.64%, 9.57~21.01 mm, 1.94~15.17 mm, respectively. There were significant differences in the stabilities of aggregates in different herb communities, the stabilities of aggregate in Thymus mongolicus, Potentilla acaulis communites were the highest. R0.25, MWD and GWD of soil aggregate of each herb community showed the pattern of rising at first and then decreasing with the depth of the soil layer. The relationship between root distributions and soil aggregates in herb communities was analyzed, it was found that root parameters and soil aggregate stability indicators did not show significant correlation, indicating that the roles of several typical herb roots in soil structure changes were not clear, the trial is to be refined gradually.
- References:
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