魏翠兰,高伟达,李录久,黄峰,李保国.不同初始条件对砂姜黑土收缩特征的影响[J].农业机械学报,2017,48(10):229-236,271.
WEI Cuilan,GAO Weida,LI Lujiu,HUANG Feng,LI Baoguo.Effects of Initial Conditions on Soil Shrinkage Characteristic of Shajiang Black Soil[J].Transactions of the Chinese Society for Agricultural Machinery,2017,48(10):229-236,271.
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不同初始条件对砂姜黑土收缩特征的影响   [下载全文]
Effects of Initial Conditions on Soil Shrinkage Characteristic of Shajiang Black Soil   [Download Pdf][in English]
投稿时间:2017-02-24  
DOI:10.6041/j.issn.1000-1298.2017.10.028
中文关键词:  砂姜黑土  容重  含水率  砂姜含量  收缩特征
基金项目:“十二五”国家科技支撑计划项目(2012BAD05B00)和国家重点研发计划项目(2016YFD0300804-3)
作者单位
魏翠兰 中国农业大学 
高伟达 中国农业大学 
李录久 安徽省农业科学院 
黄峰 中国农业大学 
李保国 中国农业大学 
中文摘要:利用离心机法,分别测定了初始容重为1.10、1.22、1.31g/cm3,初始含水率为49.34%、43.55%、36.03%、31.93%和25.51%以及砂姜质量分数为0、4%、6%、8%、10%和12%的砂姜黑土样品在不同吸力下的土壤体积含水率及收缩特征。结果表明:在考虑土壤收缩变形的情况下,相比VG模型,Gregory模型可以更好地拟合砂姜黑土的水分特征,砂姜黑土含水率随着土样初始容重及初始含水率增加而增加,随着砂姜含量增加而降低。收缩过程中,在不同初始容重处理下,初始容重增加,土壤的线缩率减小,土壤收缩后容重增加比例下降;且初始容重增加显著提高了土壤结构收缩段孔隙收缩比例,降低了线性收缩段孔隙收缩比例。在不同初始含水率处理下,初始含水率越高,土壤线缩率及收缩后的容重越大;当初始含水率为36.03%时,土壤结构收缩段孔隙收缩比例最高,线性收缩段孔隙收缩比例较低。在不同砂姜含量处理下,砂姜含量的提高减小了线缩率及土壤收缩后的容重,增加了土壤总孔隙比。因此,对于砂姜黑土而言,在一定范围内,提高土壤容重以及降低土壤含水率可以减少土壤收缩;而在砂姜含量较高的情况下,主要应防止由于大孔隙存在而引起的水分流失。
WEI Cuilan  GAO Weida  LI Lujiu  HUANG Feng  LI Baoguo
China Agricultural University,China Agricultural University,Anhui Academy of Agricultural Sciences,China Agricultural University and China Agricultural University
Key Words:Shajiang black soil  bulk density  water content  Shajiang content  shrinkage characteristics
Abstract:Shajiang black soil is one of the major soil types with low and medium productivity in Huaibei Plain, a sub plain of Huang-Huai-Hai Plain (HHH) of China. Certrifuge method was used to investigate the effects of different initial conditions on its shrinkage characteristics during drying process. The results showed that soil water characteristic curve (SWCC) was fitted better by Gregory model than the VG model when the shrinkage characteristic was considered. When the initial density (ρb) were 1.10g/cm3,1.22g/cm3 and 1.32g/cm3(B1, B2 and B3), respectively, soil water retention capacity at the same water suction was improved as the initial ρb was increased, linear shrinkage ratio was increased as the initial ρb was decreased. The final ρb upon shrinkage was positively correlated with the initial ρb. The increased initial bulk density increased void ratio in soil structure shrinking phase, while decreased void ratio in linear shrinking phase. When the initial water content were 49.34%, 43.55%, 36.03%, 31.93% and 25.51% (W1, W1, W3, W4 and W5), respectively, the higher the initial water content was, the faster the water lost, and the linear shrinkage ratio was increased. The void ratio in the structure shrinkage phase was the highest when water content was 36.03%. When the Shajiang contents were 0, 4%, 6%, 8%, 10% and 12% (SJ1, SJ2, SJ3, SJ4, SJ5 and SJ6) respectively, Shajiang content had little effect on linear shrinkage ratio and bulk density after shrinkage, and with the increase of Shajiang content, soil water content under the same soil suction was decreased. Soil void ratio was increased as Shajiang content was increased, but the soil moisture ratio was decreased under the same void ratio.

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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