宁夏南部黄土丘陵区3种草本根土复合体抗冲性及其与影响因素的关系  

Anti-scouribility of Three Herbaceous Root-Soil System and Its Relationship with Influencing Factors in Loess Hilly Region of Southern Ningxia

作　　者：万海霞[1] 许浩[1] 王月玲[1] 韩新生[1] 董立国[1] 郭永忠[1] 安钰[1] 贾廷民 Wan Haixia;Xu Hao;Wang Yueling;Han Xinsheng;Dong Liguo;Guo Yongzhong;An Yu;Jia Tingmin(Institute of Forestry and Grassland Ecology,Ningxia Academy of Agricultural and Forestry Sciences,Yinchuan 750002,China;Ningxia Jinjiping Ecological Leisure Agriculture Development Co.,Ltd.,Pengyang,Ningxia 756500,china)

机构地区：[1]宁夏农林科学院林业与草地生态研究所,银川750002 [2]宁夏金鸡坪生态休闲农业开发有限公司,宁夏彭阳756500

出　　处：《水土保持研究》2024年第3期115-127,共13页Research of Soil and Water Conservation

基　　金：宁夏自然科学基金项目(2022AAC03425);宁夏农林科学院科技创新引导项目(2022AAC03425);宁夏回族自治区重点研发计划项目(2020BCF01001);宁夏回族自治区农业高质量发展和生态保护科技创新示范项目(NGSB-2021-14-01)。

摘　　要：[目的]明确宁夏南部黄土丘陵区3种草本根土复合体抗冲性差异及其与相关影响因素的关系,为研究区生态建设质量提升及植被优化配置提供理论依据。[方法]以研究区常见草本百里香、星毛委陵菜、长芒草根土复合体为研究对象,采用室内原状土水槽冲刷法,并利用LA-S根系扫描分析系统,研究不同草本0—15 cm土层根土复合体抗冲性能及其与根、土的关系。[结果](1) 3种草本0—15 cm土层根土复合体抗冲性大小为星毛委陵菜(53.7 L·h/g)>百里香(36.5 L·h/g)>长芒草(14.2 L·h/g),星毛委陵菜根土复合体抗冲性最强。(2) 3种草本根系根长密度、表面积密度、体积密度和比根长分别为4.25~10.56 cm/cm^(3),42.95~111.51 mm^(2)/cm^(3),5.04~17.94 mm^(3)/cm^(3),35.06~67.96 m/g,根长密度等参数百里香明显大于其他草本。(3)各草本根系分布土壤的有机碳含量百里香(1.437%)>星毛委陵菜(1.290%)>长芒草(0.430%)。根系土壤黏粒含量百里香是星毛委陵菜、长芒草的1.14倍、1.20倍。3种草本土壤团聚体参数MWD,GMD,R_(>0.25)分别为13.80~18.23 mm, 7.15~11.11 mm, 43.06%~70.05%,各指标星毛委陵菜最大。(4)根系、土壤均能直接或间接、单独或共同影响根土复合体抗冲性。百里香土壤黏粒、粉粒、砂粒及团聚体直接影响土体抗冲性,其大部分根系还通过影响土壤机械组成和有机碳含量间接影响抗冲性。星毛委陵菜土壤粉粒和大部分细根直接影响土体抗冲性,其0~0.5 mm根、土壤黏粒、砂粒还通过影响土壤团聚体等间接影响抗冲性。长芒草土壤砂粒、0~1.0 mm根直接影响土体抗冲性,其特定细根还通过影响土壤团聚体和有机碳含量间接影响抗冲性。[结论]3种草本根土复合体抗冲性大小有明显差异,根系、土壤均能影响其抗冲性能,在宁夏南部黄土丘陵区进行生态建设应考虑不同草本(植被)的抗冲性能,并在改善相关影响因素的基础上加以�[Objective]The aims of this study are to clarify the anti-scourability difference of three herbaceous root-soil system and its relationship with influencing factors in the loess hilly region of southern Ningxia,and to provide a theoretical basis for improving the quality of ecological construction and optimizing the allocation of vegetation in the study area.[Methods]The common herbaceous root-soil system of Thymus mongolicus,Potentilla acaulis and Stipa bungeana were taken as research objects of the study area.The indoor undamaged soil trench scouring tests was carried out.LA-S root sanning analysis system was used to study the anti-scourability of different herbs root-soil system in 0—15 cm soil layer and their relationship with root and soil.[Results](1)The anti-scourability of three herbaceous root-soil system in 0—15 cm soil layer decreased in the order:Potentilla acaulis(53.7 L·h/g)>Thymus mongolicus(36.5 L·h/g)>Stipa bungeana(14.2 L·h/g).Potentilla acaulis root-soil system anti-scourability was the strongest.(2)The average root length density,surface area density,volume density and specific root length of three herbaceous root-soil system in 0—15 cm soil layer were 4.25~10.56 cm/cm^(3),42.95~111.51 mm^(2)/cm^(3),5.04~17.94 mm^(3)/cm^(3),35.06~67.96 m/g,respectively.The root length density and other parameters of Thyme mongolicus were significantly larger than other herbs.(3)The organic carbon contents of three herbaceous root soils in 0—15 cm soil layer decreased in the order:Thyme mongolicus(1.437%)>Potentilla acaulis(1.290%)>Stipa bungeana(0.430%).The root soil clay content of Thyme mongolicus was 1.14 times and 1.20 times that of Potentilla acaulis and Stipa bungeana.The soil aggregate parameters MWD,GMD,and R_(>0.25) of three herbaceous were 13.80~18.23 mm,7.15~11.11 mm,and 43.06%~70.05%,respectively.All above indicators of Potentilla acaulis was the largest.(4)Root and soil could directly or indirectly,individually or jointly affect anti-scourability of three herbaceous root-soil system.Cla

关 键 词：土壤 侵蚀 草本根土复合体 抗冲性 根系 

分 类 号：S157.1[农业科学—土壤学]