کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8845257 1617110 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Soil nitrogen supply capacity as an indicator of sustainable watershed management in the upper basin of Miyun Reservoir
ترجمه فارسی عنوان
ظرفیت تامین نیتروژن خاک به عنوان شاخص مدیریت آبخیزداری پایدار در حوضه فوقانی مخازن میون
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی
Comprehensive evaluation of soil N supply capacity is a fundamental approach to reduce N pollution. In this research, we developed a novel framework to quantify soil N supply capacity. This was accomplished by integrating a multivariate regression analysis and a path analysis to establish the relationship between the amount of soil supplied N and six main processes (i.e., organic N mineralization, atmospheric N deposition, litter decomposition, nitrification, denitrification and surface runoff) related to soil N cycle, with exclusion of the multi-collinearity among these six main processes. Soil N supply capacity was measured by the ratio of soil supplied N and plant required N. The results revealed that (1) organic N mineralization was the dominant process that sustained the amount of soil supplied N, contributing 81.51-121.54 kg N/hm2 a under different land utilization patterns; (2) processes such as atmospheric N deposition, litter decomposition and surface runoff could affect the amount of soil supplied N as well. In detail, atmospheric N deposition contributed 11.88-27.79 kg N/hm2 a to soil supplied N. Litter decomposition in coniferous, broadleaf and mixed forests provided 57.31-59.26 kg N/hm2 a to soil supplied N, which accounted for over half of the N provided by organic N mineralization. Surface runoff reduced soil supplied N by about 14.78% (73.57 kg N/hm2 a) in the shrub forest; (3) soil N supply capacity under different land use types ranged from 1.43 to 8.30, indicating sufficient fertility for plant growth and an insistent demand for soil N management.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Indicators - Volume 92, September 2018, Pages 221-227
نویسندگان
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