水土保持学报2017，Vol.31Issue(2)：72-78,7.DOI:10.13870/j.cnki.stbcxb.2017.02.014
黄土区草被生长过程中土壤抗冲性及其与影响因素的关系
Soil Anti-scourability of the Growing Grass and Its Relationship with Influencing Factors in the Loessial Soil Area
摘要
Abstract
By combining indoor pot experiment and scouring of undisturbed soil,three treatments were set up,i.e.bare land (CK),low planting density Lolium perenne L.(H1),and high planting density Lolium perenne L.(H2),to study the changes of soil physiochemical properties and root system at different growth stages.Soil anti-scourability of the growing grass and its relationship with influencing factors in the loessial soil area were analyzed.The results showed that:(1) Soil bulk density,organic matter content,and waterstable aggregates of CK fluctuated at four growth stages,but the ranges of changes were small.Soil bulk density decreased,organic matter content,water-stable aggregates,root surface area density (RSAD),and root weight density (RWD) showed an increasing trend with the extension of the growth cycle of H1 and H2.The RSAD of H1 and H2 treatments decreased with increasing root diameter at four growth stages.(2) Soil anti-scourability index (ASI) of CK and H2 were not significantly different at four growth stages.The ASI of H1 showed an increasing trend with the extension of growth time,and the effect of H1 treatment on ASI was the most significant at the 16th week.(3) ASI had a diminishing power function relationship with soil bulk density.ASI had an increasing power function relationship with organic matter content,and waterstable aggregates.ASI had an increasing exponential function relationship with RSAD,and RWD.(4) There was no significant difference between ASI and bulk density,water-stable aggregates,and 1.0 mm to 2.0 mm,2.0 mm to 5.0 mm,and ＞5 mm diameter class RSAD.There was a significantly positive correlation between ASI and organic matter content,RSAD,and RWD (p＜0.05).There was a highly significantly positive correlation between ASI and ＜1 mm diameter class RSAD (p＜0.01).关键词
土壤抗冲性/容重/有机质含量/水稳性团聚体/根表面积密度/根生物量密度Key words
soil anti-scourability/bulk density/organic matter content/water-stable aggregates/root surface area density/root weight density分类
农业科技引用本文复制引用
刘红岩,周正朝,刘俊娥,覃淼,李超..黄土区草被生长过程中土壤抗冲性及其与影响因素的关系[J].水土保持学报,2017,31(2):72-78,7.基金项目
国家自然科学基金项目“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) （41571260）
国家自然科学基金项目“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) （41501290）
陕西省自然科学基金项目“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）
