王长燕,郁耀闯.黄土丘陵区不同草被类型土壤细沟可蚀性季节变化研究[J].农业机械学报,2016,47(8):101-108.
Wang Changyan,Yu Yaochuang.Seasonal Variations of Soil Rill Erodibility under Different Types of Grass in Loess Hilly Region[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(8):101-108.
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黄土丘陵区不同草被类型土壤细沟可蚀性季节变化研究   [下载全文]
Seasonal Variations of Soil Rill Erodibility under Different Types of Grass in Loess Hilly Region   [Download Pdf][in English]
投稿时间:2016-03-30  
DOI:10.6041/j.issn.1000-1298.2016.08.014
中文关键词:  黄土丘陵区  土壤细沟可蚀性  季节变化  土壤硬化  根系生长
基金项目:国家自然科学基金项目(41171423、41371497)、陕西省教育厅重点实验室项目(2009JS071)和宝鸡文理学院重点科研项目 (ZK15052、ZK1054)
作者单位
王长燕 宝鸡文理学院 
郁耀闯 宝鸡文理学院 
中文摘要:运用坡面径流冲刷试验,结合土壤侵蚀过程WEPP模型,研究了黄土丘陵区赖草和紫花苜蓿生长季土壤细沟可蚀性的季节变化特征及其影响因素。结果表明,赖草地的土壤细沟可蚀性在整个生长季呈现出先升高后降低再升高的不明显的季节变化趋势(p>0.05),紫花苜蓿地土壤细沟可蚀性在整个生长季呈现出先降低后趋于稳定再降低的明显的季节变化趋势(p<0.05)。赖草地和紫花苜蓿地土壤细沟可蚀性生长季的变化主要受到土壤硬化过程、水稳性团聚体(大于0.25mm)和草地根系生长的影响。赖草和紫花苜蓿地的土壤细沟可蚀性随着土壤粘结力、容重、水稳性团聚体和草地根系密度的增加呈指数函数形式降低。利用土壤容重和根系密度可以很好地模拟赖草地和紫花苜蓿地土壤细沟可蚀性的季节变化(R≥0.86,NSE≥0.85)。为黄土高原地区植被恢复过程中的水土保持效益分析及措施优化配置提供理论基础和数据支撑。
Wang Changyan  Yu Yaochuang
Baoji Arts & Sci. University and Baoji Arts & Sci. University
Key Words:loess hilly region  soil rill erodibility  seasonal variations  soil consolidation  root growth
Abstract:The seasonal variations of soil rill erodibility and their potential affecting factors were investigated by carrying out the experiment of water flumes with adjustable bed gradient and using the soil erosion process WEPP model, which was conducted in two tracts of rehabilitated grasslands in “Grain for Green” history during the grass growing season. One (Tract A) had been planted with Leymus secalimus for three years and the other (Tract B) with Medicago sativa L. for 17 years. Results showed that the soil rill erodibility of Tract A of grassland was increased at first and then declined and again increased during the whole growing season (p>0.05), while the soil rill erodibility of Tract B of grassland was declined at first and then became stable and again declined significantly during the whole growing season (p<0.05). The soil rill erodibilities of the two grasslands were varied seasonally, which were mainly affected by soil consolidation, formation of water-stable aggregates and root growth. With the increase of soil cohesion, bulk density, content of water stable aggregates and grass root density, the soil rill erodibility in either soil was declined exponentially. Seasonal variations of soil rill erodibilities of two grasslands could well be simulated with soil bulk density and root density (R≥0.86,NSE≥0.85). The mean soil rill erodibility of Leymus secalimus and Medicago sativa L. during the whole growing season was much less than that of the control tract, which suggested that the practice of “Grain for Green” in hilly regions of the Loess Plateau of China was beneficial to soil and water conservation. The findings of this study may do duty for data support and theoretic basis in elaborating hydrodynamic mechanisms of the soil rill erodibility processes, evaluating effect of grass roots in fields of “Grain for Green” on soil and water conservation, and rationalizing arrangement of soil and water conservation practices and measures in hilly regions of the Loess Plateau of China.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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