کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
305604 513039 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The relationship between soil microbial activity and microbial biomass, soil structure and grassland management
ترجمه فارسی عنوان
رابطه بین فعالیت میکروبی خاک و بیوماس میکروبی، ساختار خاک و مدیریت مرتع
کلمات کلیدی
کربن آلاینده خاک نیتروژن خاک، ارزیابی بصری ساختار خاک، فعالیت آنزیم، مدیریت چمنزار
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
چکیده انگلیسی


• Good soil structure was associated with high microbial activity.
• Reseeding is helpful to accelerate soil enzyme activity.
• N fertilizer input significantly increased both C and N enzyme at 10–20 cm depth.
• Intensified grazing significantly increased both C and N enzyme at different depths.
• Soil C acts as two-way ‘bridge’ in relationship of soil structure and microbial activity.

The question of how soil structure interacts with microbial biomass is poorly understood. Most research on soil structure and soil microbial activity has been based on laboratory measurements of soil properties that are indirectly indicative of soil structure, and very few have used direct field data. This study assessed soil structural quality in situ by visual evaluation of soil structure method (VESS) and measured microbial activity related to soil carbon (C) and nitrogen (N) cycles under various grassland management to assess whether soil structure is correlated with microbial activity, both of which are regulated by agricultural management. Soil structure (indicated by Sq score) was strongly negatively correlated with both soil respiration and enzyme activity, indicating a decline in microbial activity with poorer soil structural quality. Both frequent reseeding and N fertilizer application were positively correlated with enzyme activity indicating that these management activities, planned to improve yield can have positive impacts on C input to the soil as well. The increase in enzyme activity under higher stocking rate was perhaps driven by soil C re-location to depth by animal trampling. The strong correlation between soil structure and C and microbial activity and C indicated a two-way ‘bridge’ function of soil C regulated by management. Good structure is supportive of soil organic matter decomposition by supplying optimal physical conditions, which supply food source for soil microbes and the soil processes of soil C dominated by microbial activity are beneficial for soil structure formation. However, further research is required to better understand this two-way C ‘bridge’ function.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Soil and Tillage Research - Volume 146, Part A, March 2015, Pages 32–38
نویسندگان
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