scholarly journals Deforestation for oil palm alters the fundamental balance of the soil N cycle

2016 ◽  
Vol 95 ◽  
pp. 223-232 ◽  
Author(s):  
R. Liz Hamilton ◽  
Mark Trimmer ◽  
Chris Bradley ◽  
Gilles Pinay
Keyword(s):  
Oil Palm ◽  
Soil N ◽  
N Cycle ◽  
Soil N Cycle

scholarly journals The soil N cycle: new insights and key challenges

SOIL ◽  
2015 ◽  
Vol 1 (1) ◽  
pp. 235-256 ◽  
Author(s):  
J. W. van Groenigen ◽  
D. Huygens ◽  
P. Boeckx ◽  
Th. W. Kuyper ◽  
I. M. Lubbers ◽  
...  
Keyword(s):  
N Cycling ◽  
Greenhouse Gas Mitigation ◽  
Future Research ◽  
N Fixation ◽  
Gaseous Emissions ◽  
Soil N ◽  
Personal View ◽  
Total N ◽  
N Cycle ◽  
Soil N Cycle

Abstract. The study of soil N cycling processes has been, is, and will be at the centre of attention in soil science research. The importance of N as a nutrient for all biota; the ever-increasing rates of its anthropogenic input in terrestrial (agro)ecosystems; its resultant losses to the environment; and the complexity of the biological, physical, and chemical factors that regulate N cycling processes all contribute to the necessity of further understanding, measuring, and altering the soil N cycle. Here, we review important insights with respect to the soil N cycle that have been made over the last decade, and present a personal view on the key challenges of future research. We identify three key challenges with respect to basic N cycling processes producing gaseous emissions: 1. quantifying the importance of nitrifier denitrification and its main controlling factors; 2. characterizing the greenhouse gas mitigation potential and microbiological basis for N2O consumption; 3. characterizing hotspots and hot moments of denitrification Furthermore, we identified a key challenge with respect to modelling: 1. disentangling gross N transformation rates using advanced 15N / 18O tracing models Finally, we propose four key challenges related to how ecological interactions control N cycling processes: 1. linking functional diversity of soil fauna to N cycling processes beyond mineralization; 2. determining the functional relationship between root traits and soil N cycling; 3. characterizing the control that different types of mycorrhizal symbioses exert on N cycling; 4. quantifying the contribution of non-symbiotic pathways to total N fixation fluxes in natural systems We postulate that addressing these challenges will constitute a comprehensive research agenda with respect to the N cycle for the next decade. Such an agenda would help us to meet future challenges on food and energy security, biodiversity conservation, water and air quality, and climate stability.

scholarly journals Assisted phytoextraction of heavy metals: compost and Trichoderma effects on giant reed (Arundo donax L.) uptake and soil N-cycle microflora

2013 ◽  
Vol 8 (4) ◽  
pp. 29 ◽  
Author(s):  
Nunzio Fiorentino ◽  
Massimo Fagnano ◽  
Paola Adamo ◽  
Adriana Impagliazzo ◽  
Mauro Mori ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Arundo Donax ◽  
Giant Reed ◽  
Soil N ◽  
N Cycle ◽  
Soil N Cycle ◽  
Assisted Phytoextraction ◽  
Arundo Donax L

Influences of irrigation and fertilization on soil N cycle and losses from wheat–maize cropping system in northern China

2021 ◽  
Vol 278 ◽  
pp. 116852
Author(s):  
Xin Zhang ◽  
Guangmin Xiao ◽  
Roland Bol ◽  
Ligang Wang ◽  
Yuping Zhuge ◽  
...  
Keyword(s):  
Cropping System ◽  
Northern China ◽  
Soil N ◽  
N Cycle ◽  
Soil N Cycle

scholarly journals The soil N cycle: new insights and key challenges

2014 ◽  
Vol 1 (1) ◽  
pp. 623-676 ◽  
Author(s):  
J. W. van Groenigen ◽  
D. Huygens ◽  
P. Boeckx ◽  
T. W. Kuyper ◽  
I. M. Lubbers ◽  
...  
Keyword(s):  
Root Traits ◽  
Science Research ◽  
N Cycling ◽  
Greenhouse Gas Mitigation ◽  
Future Research ◽  
N Fixation ◽  
Soil N ◽  
Personal View ◽  
N Cycle ◽  
Soil N Cycle

Abstract. The study of soil N cycling processes has been, is, and will be at the center of attention in soil science research. The importance of N as a nutrient for all biota; the ever increasing rates of its anthropogenic input in terrestrial (agro)ecosystems; its resultant losses to the environment; and the complexity of the biological, physical, and chemical factors that regulate N cycling processes all contribute to the necessity of further understanding, measurement and mitigation of the soil N cycle. Here, we review important insights with respect to the soil N cycle that have been made over the last decade, and present a personal view on the key challenges for future research (Fig. 1). We identified four key questions with respect to N cycling processes: 1. How large is the contribution of non-symbiotic N fixation in natural systems? 2. How important is nitrifier denitrification and what are its main controlling factors? 3. What is the greenhouse gas mitigation potential and microbiological basis for N2O consumption? 4. How can we characterize hot-spots and hot-moments of denitrification? Furthermore, we propose three questions about proximal controls on N cycling processes: 1. How does functional diversity of soil fauna affect N cycling beyond mineralization? 2. What is the functional relationship between root traits and soil N cycling? 3. To what extent do different types of mycorrhizal symbioses (differentially) affect N cycling? Finally, we identified a key challenge with respect to modelling: 1. How can advanced 15N/18O tracing models help us to better disentangle gross N transformation rates? We postulate that addressing these questions would constitute a comprehensive research agenda with respect to the N cycle for the next decade. Such an agenda would help us to meet future challenges on food and energy security, biodiversity conservation and climate stability.

Response of microbial functional groups involved in soil N cycle to N, P and NP fertilization in Tibetan alpine meadows

2016 ◽  
Vol 101 ◽  
pp. 195-206 ◽  
Author(s):  
Wenbin Ma ◽  
Shengjing Jiang ◽  
Féline Assemien ◽  
Mingsen Qin ◽  
Beibei Ma ◽  
...  
Keyword(s):  
Functional Groups ◽  
Soil N ◽  
Alpine Meadows ◽  
N Cycle ◽  
Microbial Functional Groups ◽  
Soil N Cycle

scholarly journals Control of soil N cycle processes byPteridium aquilinumandErica cinereain heathlands along a pH gradient

Ecosphere ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. e02426 ◽  
Author(s):  
Clément Bardon ◽  
Boris Misery ◽  
Florence Piola ◽  
Franck Poly ◽  
Xavier Le Roux
Keyword(s):  
Ph Gradient ◽  
Soil N ◽  
N Cycle ◽  
Soil N Cycle

How does biochar influence soil N cycle? A meta-analysis

2018 ◽  
Vol 426 (1-2) ◽  
pp. 211-225 ◽  
Author(s):  
Qi Liu ◽  
Yanhui Zhang ◽  
Benjuan Liu ◽  
James E. Amonette ◽  
Zhibin Lin ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Soil N ◽  
N Cycle ◽  
Soil N Cycle

scholarly journals Decadal fates and impacts of nitrogen additions on temperate forest carbon storage: a data–model comparison

2019 ◽  
Vol 16 (13) ◽  
pp. 2771-2793 ◽  
Author(s):  
Susan J. Cheng ◽  
Peter G. Hess ◽  
William R. Wieder ◽  
R. Quinn Thomas ◽  
Knute J. Nadelhoffer ◽  
...  
Keyword(s):  
Temperate Forest ◽  
15N Tracer ◽  
N Recovery ◽  
Soil N ◽  
Short Term ◽  
Tracer Studies ◽  
N Cycle ◽  
C Stocks ◽  
N Additions

Abstract. To accurately capture the impacts of nitrogen (N) on the land carbon (C) sink in Earth system models, model responses to both N limitation and ecosystem N additions (e.g., from atmospheric N deposition and fertilizer) need to be evaluated. The response of the land C sink to N additions depends on the fate of these additions: that is, how much of the added N is lost from the ecosystem through N loss pathways or recovered and used to increase C storage in plants and soils. Here, we evaluate the C–N dynamics of the latest version of a global land model, the Community Land Model version 5 (CLM5), and how they vary when ecosystems have large N inputs and losses (i.e., an open N cycle) or small N inputs and losses (i.e., a closed N cycle). This comparison allows us to identify potential improvements to CLM5 that would apply to simulated N cycles along the open-to-closed spectrum. We also compare the short- (< 3 years) and longer-term (5–17 years) N fates in CLM5 against observations from 13 long-term 15N tracer addition experiments at eight temperate forest sites. Simulations using both open and closed N cycles overestimated plant N recovery following N additions. In particular, the model configuration with a closed N cycle simulated that plants acquired more than twice the amount of added N recovered in 15N tracer studies on short timescales (CLM5: 46±12 %; observations: 18±12 %; mean across sites ±1 standard deviation) and almost twice as much on longer timescales (CLM5: 23±6 %; observations: 13±5 %). Soil N recoveries in simulations with closed N cycles were closer to observations in the short term (CLM5: 40±10 %; observations: 54±22 %) but smaller than observations in the long term (CLM5: 59±15 %; observations: 69±18 %). Simulations with open N cycles estimated similar patterns in plant and soil N recovery, except that soil N recovery was also smaller than observations in the short term. In both open and closed sets of simulations, soil N recoveries in CLM5 occurred from the cycling of N through plants rather than through direct immobilization in the soil, as is often indicated by tracer studies. Although CLM5 greatly overestimated plant N recovery, the simulated increase in C stocks to recovered N was not much larger than estimated by observations, largely because the model's assumed C:N ratio for wood was nearly half that suggested by measurements at the field sites. Overall, results suggest that simulating accurate ecosystem responses to changes in N additions requires increasing soil competition for N relative to plants and examining model assumptions of C:N stoichiometry, which should also improve model estimates of other terrestrial C–N processes and interactions.

N fertilization effects on N2O fluxes from oil palm plantation on tropical peatland

2021 ◽  
Author(s):  
Auldry Chaddy ◽  
Lulie Melling ◽  
Kiwamu Ishikura ◽  
Ryusuke Hatano
Keyword(s):  
Oil Palm ◽  
Elaeis Guineensis ◽  
Pore Space ◽  
Anthropogenic Activities ◽  
N Uptake ◽  
N Fertilization ◽  
Soil N ◽  
Tropical Peatland ◽  
Oil Palm Plantation ◽  
The Impact

&lt;p&gt;Anthropogenic activities, and in particular the use of synthetic nitrogen (N) fertilizer, have a significant influence on soil nitrous oxide (N&lt;sub&gt;2&lt;/sub&gt;O) emission from oil palm plantation on tropical peatland. Finding a suitable N rate for optimum N uptake efficiency and yield with low environmental impact and production cost is crucial for the economic growth of Malaysia&amp;#8217;s oil palm sector. However, studies on the impact of N fertilizers on N&lt;sub&gt;2&lt;/sub&gt;O emissions&amp;#160;from&amp;#160;tropical peatland are limited. Thus, long-term monitoring was conducted to investigate the effects of N fertilization on soil N&lt;sub&gt;2&lt;/sub&gt;O emissions. This study was conducted in an oil palm (&lt;em&gt;Elaeis guineensis Jacq&lt;/em&gt;.) plantation located in a tropical peatland in Sarawak, Malaysia. Monthly soil N&lt;sub&gt;2&lt;/sub&gt;O fluxes were measured using the closed-chamber method in a control (T1, without N fertilization), and under three different N treatments: low N (T2, 31.1 kg N ha&lt;sup&gt;&amp;#8722;1&lt;/sup&gt;), moderate N (recommended rate) (T3, 62.2 kg N ha&lt;sup&gt;&amp;#8722;1&lt;/sup&gt;), and high N (T4, 124.3 kg N ha&lt;sup&gt;&amp;#8722;1&lt;/sup&gt;), from January 2010 to December 2013 and from January 2016 to December 2017. The only N fertiliser rate to significantly increase (p&lt;0.05) annual cumulative N&lt;sub&gt;2&lt;/sub&gt;O emissions was 124.3 kg N ha&lt;sup&gt;-1&lt;/sup&gt; (T4). Increased&amp;#160;in water-filled pore space (WFPS) (&gt;70%) with a decrease in both N&lt;sub&gt;2&lt;/sub&gt;O flux and nitrate (NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;&amp;#8722;&lt;/sup&gt;) implies that complete denitrification has taken place.&amp;#160;Increased in NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt;&amp;#160;uptake by oil palm with an increase in WFPS decreased NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt; concentration in soil, resulting in the reduction of N&lt;sub&gt;2&lt;/sub&gt;O emission. This study highlights the importance of WFPS on denitrification and &lt;span&gt;N uptake &lt;/span&gt;&lt;span&gt;by oil palm in tropical peatland. This needs to be taken into account for the accurate assessment of N dynamics in oil palm plantations on tropical peatland in order to enhance N fertilization management strategies and counteract anthropogenic activities that produce greenhouse gases.&lt;/span&gt;&lt;/p&gt;&lt;p&gt;Keywords: WFPS, oil palm yield, NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt;, N uptake&lt;/p&gt;

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