Development of Soil Crusts Under Simulated Rainfall and Crust Formation on a Loess Soil as Influenced by Polyacrylamide

文献类型： 外文期刊

第一作者： Li Shun-Jiang

作者： Li Shun-Jiang;Hu Xia;Liu Lian-You;Lu Yan-Li;Guo Jin-Rui;Hu Xia;Liu Lian-You;Lu Yan-Li;Guo Jin-Rui;Cai Qiang-Guo

作者机构：

关键词： depositional crust;raindrop impact;soil aggregates;splash erosion;structural crust

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2012 年 22 卷 3 期

页码：

收录情况： SCI

摘要： This study evaluated the morphological characteristics and dynamic variation in characteristics of soil crust and identified the relationships between soil crust and splash erosion under simulated rainfall. The effect of polyacrylamide (PAM) on soil aggregate stabilization and crust formation was also investigated. A laboratory rainfall simulation experiment was carried out using soil sample slices. The slices were examined under a polarized light microscopy and a scanning electron microscope (SEM). The results revealed that the soil crusts were thin and were characterized by a greater density, higher shear strength, finer porosity, and lower saturated hydraulic conductivity than the underlying soil. Two types of crusts, i.e., structural and depositional crusts, were observed. Soil texture was determined to be the most important soil variable influencing surface crust formation; depositional crust formation was primarily related to the skeleton characteristics of the soil and happened when the soil contained a high level of medium and large aggregates. The crust formation processes observed were as follows: 1) The fine particles on the soil surface became spattered, leached, and then rough in response to raindrop impact and 2) the fine particles were washed into the subsoil pores while a compact dense layer concurrently formed at soil surface due to the continual compaction by the raindrops. Therefore, the factors that influenced structural crust formation were a large amount of fine particles in the soil surface, continual impact of raindrops, dispersion of aggregates into fine particles, and the formation of a compact dense layer concurrently at the soil surface. It was concluded that the most important factor in the formation of soil crusts was raindrop impact. When polyacrylamide (PAM) was applied, it restored the soil structure and greatly increased soil aggregate stabilization. This effectively prevented crust formation. However, this function of PAM was not continuously effective and the crust reformed with long-term rainfall. In conclusion, this study showed that soil micromorphological studies were a useful method for evaluating soil crust formation.

分类号：

  • 相关文献

[1]Crop species affect soil organic carbon turnover in soil profile and among aggregate sizes in a Mollisol as estimated from natural C-13 abundance. Qiao, Yunfa,Miao, Shujie,Qiao, Yunfa,Miao, Shujie,Li, Na,Xu, Yanli,Han, Xiaozeng,Zhang, Bin,Zhang, Bin.

[2]Pore-scale simulation of gas diffusion in unsaturated soil aggregates: Accuracy of the dusty-gas model and the impact of saturation. Li, Zhongyang,Zhang, Xiaoxian,Liu, Yuan,Zhang, Xiaoxian.

[3]Soil aggregation and organic carbon fractions affected by long-term fertilization in a red soil of subtropical China. Huang, Shan,Peng, Xianxian,Huang, Qianru,Zhang, Weijian,Zhang, Weijian.

[4]Shifts in soil organic carbon and nitrogen dynamics for afforestation in central China. Dou, Xiaolin,Shu, Xiao,Zhang, Quanfa,Cheng, Xiaoli,Dou, Xiaolin,Xu, Xia.

[5]Soil Aggregation and Microbial Responses to Straw Pulping Byproducts. Xiao, C.,Fauci, A.,Bezdicek, D. F.,Pan, W. L.,Xiao, C.,McKean, W. T..

[6]Variation of soil aggregation and intra-aggregate carbon by long-term fertilization with aggregate formation in a grey desert soil. Jiang, Maibo,Wang, Xihe,Liu, Hua,Jiang, Maibo,Liusui, Yunhao,Han, Chao,Jiang, Maibo,Zhao, Chengyi.

[7]Dynamics of physically-separated soil organic carbon pools assessed from delta C-13 changes under 25 years of cropping systems. Dou, Xiaolin,Dou, Xiaolin,He, Ping,Zhou, Wei,Wang, Ligang,Cheng, Xiaoli,Zhu, Ping. 2017

[8]Long-Term Manure Amendments Enhance Soil Aggregation and Carbon Saturation of Stable Pools in North China Plain. Du Zhang-liu,Zhang Qing-zhong,Wu Wen-liang,Guo Yan-bin,Meng Fan-qiao. 2014

[9]Change in the abundance and community composition of ammonia-oxidizing bacteria and archaea at soil aggregate level as native pasture converted to cropland in a semiarid alpine steppe of central Asia. Chen, Zhu,Guo, Yanbin,Wu, Wenliang,Meng, Fanqiao,Du, Zhangliu. 2016

[10]Effects of Integrated Soil-Crop System Management on Soil Organic Carbon Characteristics in a Primosol in Northeast China. Zhang Jinjing,Cao Zhiyuan,Feng Guozhong,Li Mengyao,Li Cuilan,Gao Qiang,Wang Lichun. 2017

[11]Spatial distribution of rhizodeposit carbon of maize (Zea mays L.) in soil aggregates assessed by multiple pulse C-13 labeling in the field. Qiao, Yunfa,Miao, Shujie,Li, Na,Han, Xiaozeng,Zhang, Bin,Zhang, Bin.

[12]Organic carbon fractions affected by long-term fertilization in a subtropical paddy soil. Huang, Shan,Rui, Wenyi,Peng, Xianxian,Huang, Qianru,Zhang, Weijian,Zhang, Weijian.

作者其他论文 更多>>

微信小程序