نتایج جستجو برای: soil structure

تعداد نتایج: 1736028  

2001
Donald L. Sparks

Contributions in the field of soil chemistry have immensely benefited humankind, including enhanced agricultural production and the quality of our environment. This review focuses on research breakthroughs since the mid-1970s and delineates frontiers in soil chemistry for the upcoming decade. However, early contributions in ion exchange, sorption phenomena, and soil acidity are highlighted. Beg...

ژورنال: علوم آب و خاک 2019

Saturated hydraulic conductivity (Ks) is one of the most important soil physical characteristics that plays a major role in the soil hydrological behaviour. It is mainly affected by the soil structure characteristics. Aggregate size distribution is a measure of soil structure formation that can affect Ks. In this study, variations of Ks were investigated in various aggregate size distributions ...

2004
Matthias C. Rillig

Rillig, M. C. 2004. Arbuscular mycorrhizae, glomalin, and soil aggregation. Can. J. Soil Sci. 84: 355–363. Arbuscular mycorrhizae are important factors of soil quality through their effects on host plant physiology, soil ecological interactions, and their contributions to maintaining soil structure. The symbiosis is faced with numerous challenges in agroecosystems; in order to inform sustainabl...

امامی, سیدنعیم, جلالیان, احمد, خسروی, عباس,

     The Occurrence of more than 400 landslides in Chaharmahal and Bakhtiari province shows a special sensitivity against erosion in this terrain. To investgate the role of the soil physical, chemical and mineral properties on the occurrence of the landslides in Afsar-Abad, Do ab Samsami in the west of Chaharmahal and Bakhtiari, were drilled six boreholes in sliding boundary and safe restrictio...

Journal: :روش های عددی در مهندسی (استقلال) 0
محمدرضا بهبهانی فرد m. r. behbahanifard محمدمهدی سعادتپور m.m. saadatpour

a frequency domain dynamic analysis is needed to obtain the response of structures constructed on a system of base isolators on flexible soil when subjected to earthquake ground motion. in such systems, the lateral stiffness of the base isolators is so small, compared to the structural stiffness, that in an earthquake attack the fundamental vibration mode dominates the response. with this in mi...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Jennifer M Talbot Thomas D Bruns John W Taylor Dylan P Smith Sara Branco Sydney I Glassman Sonya Erlandson Rytas Vilgalys Hui-Ling Liao Matthew E Smith Kabir G Peay

Identifying the ecological processes that structure communities and the consequences for ecosystem function is a central goal of ecology. The recognition that fungi, bacteria, and viruses control key ecosystem functions has made microbial communities a major focus of this field. Because many ecological processes are apparent only at particular spatial or temporal scales, a complete understandin...

Journal: :Scientific reports 2016
Wei Liu Yunlong Zhang Shanshan Jiang Yan Deng Peter Christie Philip J Murray Xiaolin Li Junling Zhang

Understanding the diversity and community structure of arbuscular mycorrhizal fungi (AMF) is important for potentially optimizing their role in mining phosphorus (P) in agricultural ecosystems. Here, we conduct a comprehensive study to investigate the vertical distribution of AMF in a calcareous field and their temporal structure in maize-roots with fertilizer P application over a three-year pe...

Journal: :Revista Brasileira de Ciência do Solo 2011

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