中国水土保持科学2018，Vol.16Issue(2)：55-61,7.DOI:10.16843/j.sswc.2018.02.008
黄土区草被生长初期土壤抗冲性及其影响因素
Soil anti-scourability at early growth stage of grasses and its influencing factors in loess region
摘要
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.关键词
土壤抗冲性/土壤密度/有机质质量分数/团聚体质量分数/根表面积密度/黄土区Key words
soil anti-scourability/soil density/organic matter mass fraction/aggregate mass fraction/root surface area density/loess region分类
农业科技引用本文复制引用
刘红岩,周正朝,王宁,李超,覃淼..黄土区草被生长初期土壤抗冲性及其影响因素[J].中国水土保持科学,2018,16(2):55-61,7.基金项目
国家自然科学基金“黄土区典型乡土草本植物对土壤侵蚀动力学过程的调控机理研究”(41571260),“黄土丘陵沟壑区植物间正相互作用对坡面植被格局的影响”(41501290) （41571260）
陕西省自然科学基金“黄土高原草被控制坡沟系统径流侵蚀动力机制及有效性研究”(2014KJXX-52) （2014KJXX-52）
