کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9490659 | 1629584 | 2005 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Soil structure and management: a review
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کلمات کلیدی
OOMMWDCECWSACmicSiCOOCPOMAMFDOCESPSOM - WHOfulvic acid - اسید فولویکHumic acid - اسید هیومیکSoil aggregation - تجمع خاکCarbon sequestration - ترسیب کربن Soil organic C - خاک ارگانیک CWater stable aggregates - دانه های پایدار آبexchangeable sodium percentage - درصد سدیم قابل تعویضAggregate dynamics - دینامیک انبوهClay - رسSoil structure - ساختار خاکSOC - سیستم روی یک تراشهcation exchange capacity - ظرفیت تبادل کاتیونArbuscular mycorrhizal fungi - قارچ های میکوریزا آربوسکولارorganic matter - ماده آلیParticulate organic matter - ماده آلی آلیDissolved organic matter - ماده آلی حل شدهSoil organic matter - ماده آلی خاکHumic substance - ماده هومیکLand use management - مدیریت استفاده از زمینMean weight diameter - میانگین قطر وزنPolyvalent cations - کاتیون های متنوعLabile fraction - کسر لبخندlight fraction - کسر نور
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Soil structure exerts important influences on the edaphic conditions and the environment. It is often expressed as the degree of stability of aggregates. Aggregation results from the rearrangement, flocculation and cementation of particles. It is mediated by soil organic carbon (SOC), biota, ionic bridging, clay and carbonates. The complex interactions of these aggregants can be synergistic or disruptive to aggregation. Clay-sized particles are commonly associated with aggregation by rearrangement and flocculation, although swelling clay can disrupt aggregates. Organo-metallic compounds and cations form bridges between particles. The SOC originates from plants, animals and microorganisms, and their exudates. It enhances aggregation through the bonding of primary soil particles. The effectiveness of SOC in forming stable aggregates is related to its decomposition rate, which in turn is influenced by its physical and chemical protection from microbial action. Soil inorganic carbon (SIC) increases aggregation in arid and semi-arid environments, and the formation of secondary carbonates is influenced by the presence of SOC and Ca2+ and Mg2+. Soil biota release CO2 and form SOC which increase dissolution of primary carbonates while cations increase precipitation of secondary carbonates. The precipitation of (hydr)oxides, phosphates and carbonates enhances aggregation. Cations such as Si4+, Fe3+, Al3+ and Ca2+ stimulate the precipitation of compounds that act as bonding agents for primary particles. Roots and hyphae can enmesh particles together while realigning them and releasing organic compounds that hold particles together, a process with a positive impact on soil C sequestration. Soil structure can be significantly modified through management practices and environmental changes. Practices that increase productivity and decrease soil disruption enhance aggregation and structural development.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 124, Issues 1â2, January 2005, Pages 3-22
Journal: Geoderma - Volume 124, Issues 1â2, January 2005, Pages 3-22
نویسندگان
C.J. Bronick, R. Lal,