کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5770614 1629414 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatial and temporal effects of nitrogen addition on root morphology and growth in a boreal forest
ترجمه فارسی عنوان
اثرات فضایی و زمانی از افزودن نیتروژن به مورفولوژی و رشد ریشه در جنگل های بومی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- To quantify the effects of N deposition on fine root growth and vertical allocation
- Fine root production and turnover were inhibited by N addition.
- The effects of N deposition on fine root synchronous considering the time and space

The production and turnover of fine roots play a critical role in regulating underground carbon (C) cycling of terrestrial ecosystems, which are a biological feature in regulating the capacity of plant to capture soil nutrients. Although the importance of fine root production (FRP) and turnover (FRT) to whole-plant and ecosystem C cycling is increasingly recognized, their response to nitrogen (N) deposition remains unclear. To understand how N addition affects the FRP and FRT of fine roots, a field experiment was conducted with four N treatment levels (0, 2.5, 5.0, and 7.5 g N m− 2 yr− 1) to quantify the effects of N deposition on fine root dynamics and vertical allocation in a boreal forest using the minirhizotron technique. Our results showed that N deposition significantly decreased total number of live and dead fine roots and total surface area of live fine roots in topsoil layers (0-20 cm soil depth), while increased in subsoil layers (20-40 cm soil depth) during 2015-2016. Average diameter of fine root was increased by N addition particularly in subsoil layers. The FRP rate was reduced by N addition in the topsoil, but increased in the subsoil layers, whereas patterns of their seasonal changes were not affected in both soil layers. The FRT rate tended to decrease under N addition compared with control in both soil layers during the observation years, potentially indicating a slower underground C cycle with N addition. Moreover, fine roots distributed more deeply in the soil due to N addition, indicating fine roots may through self-regulation and change of growth strategy to face environment stressor.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 303, 1 October 2017, Pages 178-187
نویسندگان
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