两种草本植物根系对土壤可蚀性的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 26 期数: 2019年02期页码: 55-61 栏目: 出版日期: 2019-04-28

Author(s):: QIN Jiahui, CHENG Liang, CAO Danni, GUO Zhonglu; Research Center of Soil and Water Conservation, Huazhong Agricultural University, Wuhan 430070, China

摘要:: 为揭示草本植物根系对土壤抗侵蚀能力的影响，选取白三叶（Trifolium repens L.）、黑麦草（Loliu perenne L.）及两者混播根系为研究对象，通过冲刷试验，研究了3种种植类型的根系特征及对土壤可蚀性影响。结果表明：（1）白三叶、黑麦草及混播草的根长密度（RLD）、根面积比（RAR）及根重密度（RMD）由春季到秋季呈现先升高后降低最后趋于稳定的变化趋势。（2）试验期内，土壤可蚀性大小顺序为白三叶 < 黑麦草 < 混播草 < 裸地。3种种植类型的土壤可蚀性与土壤容重、水稳性团聚体、RLD、RAR及RMD呈指数函数形式下降（R²>0.70）。（3）土壤可蚀性与0～1.0 mm径级根系极显著正相关（p<0.01），与1.0～2.0 mm，0～2.0 mm显著正相关（p<0.05）。

Abstract:: In order to explore the effect of herbaceous roots on anti-erodibility, three treatments (i. e. sole Trifolium repens L., sole Loliu perenne L. and mixed sowing of Trifolium repens L. and Loliu perenne L.) were employed. The root characteristics of the three planting types were measured, of which effects on soil erodibility were compared. Soil detachment capacity by concentrated flow was measured in a hydraulic flume with the fixed bed under five different flow shear stresses to determine soil erodibility. The results showed that: (1) the root length density (RLD), root area ratio (RAR) and root weight density (RMD) of Trifolium repens, perennial ryegrass and mixed sowing of grass first increased from spring to autumn, then decreased and finally stabilized; (2) the soil erodibility increased in the order: Trifolium repensR²>0.70); (3) soil erodibility was significantly and positively correlated with 0~1.0 mm root diameter (p<0.01), and positively correlated with 1.0~2.0 mm, 0~2.0 mm root diameter (p<0.05).

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更新日期/Last Update: 1900-01-01