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| Soil anti-scourability at early growth stage of grasses and its influencing factors in loess region |
| LIU Hongyan, ZHOU Zhengchao, WANG Ning, LI Chao, QIN Miao |
| School of Geography and Tourism, Shaanxi Normal University, 710062, Xi'an, China |
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Abstract [Background] The loess region is one of areas with serious soil erosion in China. Grasses restoration plays an important role in controlling soil and water loss in loess region. Yet there were few researches about soil anti-scourability of different planting densities grasses at early growth stage and its influencing factors in this region.[Methods] The indoor potting experiment and undisturbed soil sample scouring experiment were conducted in this study. Three treatments were set up, i.e., bare land (CK), low planting density of Lolium perenne L. (H1, 204 plants/m2), and high planting density of L. perenne L.(H2, 612 plants/m2). Each treatment had three replicates. There were nine soil samples that had grown 12 weeks. Three soil layers (i.e., surface 0-20 cm, subsurface 20-40 cm, and bottom 40-60 cm) were selected to study the change of soil anti-scourability index (IAS), soil density, organic matter mass fraction, aggregate mass fraction and root surface area density. Undisturbed soil samples were collected by a special sampler (20 cm×10 cm×15 cm), and the collected soil samples were soaked with water plate and removed from gravity water, then the soil anti-scourability test was carried out. The flow rate was applied at 3 L/min discharge on a scouring flume slope of 15° for 15 min.[Results] 1) The soil density, organic matter mass fraction, and aggregate mass fraction of CK treatment changed little in three soil layers. The soil density, organic matter mass fraction, aggregate mass fraction and root surface area density of H1 and H2 treatments changed in different degree, and the change of physiochemical properties of surface soil was most obvious. 2) Compared with the CK treatment of the same soil layer, IAS of H1 and H2 treatments increased significantly in surface soil layer, and decreased with the increase of soil layer depth, and surface soil of H2 treatment had the most significant effect on soil anti-scourability. 3) Except CK treatment, IAS of H1 and H2 treatments had a correlation with soil physiochemical properties and root surface area density (P<0.05), but there were some differences in the influencing factors of IAS.[Conclusions] In summary, planting grasses may improve soil physiochemical properties and soil anti-scourability, and the high planting density had more capacity to enhance the soil anti-scourability at early growth stage of planted grasses. These results indicate that planting grass may enhance soil anti-scourability especially with a high density, and these results provide a theoretical reference for the selection of planting density at early stage of grasses restoration in loess region.
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Received: 27 April 2017
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