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| Soil features on slopes of expressway under different biological protection models in the Hilly-gully Region of Loess Plateau:Taking Tongchuan-Huangling-Yan'an expressway as an example |
| Xiao Rong1,Gao Zhaoliang1,2,Zhang Xingchang1,2,Song Xiaoqiang3 |
| 1.College of Resource Environmental Sciences,Northwest A & F University,2.Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources: 712100,Yangling,Shaanxi;3.Shaanxi Provincial Soil and Water Conservation Bureau,710004,Xi'an: China |
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Abstract This paper selected 18 slopes under the protection models of hole shape soil prepared seeding(HSSPS),net-suspended spray seeding(NSSS),framework seeding(FS) as study objects,analyzed slopes' soil features.The results indicate: 1) The slope of Tong-Yan expressway is dry,and the fertility is deficient.Organic matter and total N are at the extremely deficient and deficient rank.The average content of available P is 16.28 mg/kg,at medium rank.2) The descending order of soil water、soil nutrient content and plant coverage performances is shady slopes,sunny slopes;order of soil bulk density performances is sunny slopes,shady slopes.Order of water content is lower slopes,upper slopes and middle slopes.Soil nutrient content elevates gradually from the upper slopes to the lower slopes.Order of plant coverage is lower slopes,upper slopes and middle slopes,and presents obvious stratification.3) Comparing the three slope protection models,FS model has the strongest ability of control moisture,then is the HSSPS model,and the lowest is the NSSS model.4) Water content is the key factor of expressway slope protection in Loess Plateau.Moreover,application of organic and nitrogenous fertilizer,protecting and collecting surface soil,increasing phosphate fertilizer and selecting the slope's degree and inclining length reasonably are very important on water and nutrient conservation and stability of slope.
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Received: 27 October 2008
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| Fund: 西北农林科技大学青年骨干资助计划“水土保持植被快速建造水力喷播技术研究”(KZCX1-10-4-1);陕西省水土保持局“线状工程建设水土流失防治技术示范推广研究项目 |
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