کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8893927 | 1629388 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of changing C and N availability on soil respiration dynamics in a temperate grassland in northern China
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Soil carbon (C) availability may play a crucial role in regulating how soil respiration responds to the increase of nitrogen (N) inputs. However, the related research is sporadic so far and has not adequately verified this speculation or addressed the topic in a widespread temperate grassland ecosystem. This lack of knowledge hinders our further accurate prediction of C emissions from terrestrial ecosystems. To improve our knowledge of the role of soil C resources in regulating Rs responses to N inputs, we established a situ field experiment with three levels of N addition (0, 50, and 100â¯kgâ¯Nâ¯haâ1â¯yrâ1) and two levels of glucose (G) addition (0 and 480â¯kgâ¯Câ¯haâ1â¯yrâ1) to determine the Rs dynamics in a temperate semiarid grassland in China. The results showed that only N addition had no significant effects on Rs as well as microbial biomass C (MBC) during our 168-hour observation period, whereas G addition and G addition together with N addition had positive effects on Rs and MBC. The regression analysis further showed that the cumulative CO2 efflux was significantly positively related to soil MBC concentrations during the 168-hour observation period. Altogether, our findings verify that soil C availability is an important driver affecting the Rs response to N addition. No response of Rs to increased N availability resulting from N input was attributed to microbial C limitation in a semiarid grassland during a 168-hour observation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 329, 1 November 2018, Pages 20-26
Journal: Geoderma - Volume 329, 1 November 2018, Pages 20-26
نویسندگان
Yunlong He, Yuchun Qi, Yunshe Dong, Qin Peng, Shufang Guo, Zhongqing Yan, Zhaolin Li, Liqin Wang,