Arid
DOI10.7717/peerj.5232
Linkages between soil carbon, soil fertility and nitrogen fixation in Acacia senegal plantations of varying age in Sudan
Abaker, Wafa E.1,2; Berninger, Frank3; Saiz, Gustavo4,5; Pumpanen, Jukka6; Starr, Mike3
通讯作者Abaker, Wafa E.
来源期刊PEERJ
ISSN2167-8359
出版年2018
卷号6
英文摘要

Background: Over the last decades sub-Saharan Africa has experienced severe land degradation and food security challenges linked to loss of soil fertility and soil organic matter (SOM), recurrent drought and increasing population. Although primary production in drylands is strictly limited by water availability, nutrient deficiencies, particularly of nitrogen (N) and phosphorus (P), are also considered limiting factors for plant growth. It is known that SOM (often measured as soil organic carbon (SOC)) is a key indicator of soil fertility, therefore, management practices that increase SOM contents, such as increasing tree cover, can be expected to improve soil fertility. The objectives of this study were to investigate the effect of Acacia senegal (Senegalia senegal) trees on soil nitrogen, phosphorus and potassium (K) in relation to SOC, the potential of A. senegal for N-2 fixation, and to identify possible N and P ecosystem limitations.


Methods: Soil nutrient (total N, P, K and available P and exchangeable K) concentrations and stocks were determined for the 0-10,10-20,20-30 and 30-50 cm layers of A. senegal plantations of varying age (ranging from 7 to 24-years-old) and adjacent grasslands (reference) at two sites in semi-arid areas of Sudan. At both sites, three plots were established in each grassland and plantation. The potential of A. senegal for N-2 fixation in relation to plantations age was assessed using delta N-15 isotopic abundances and nutrient limitations assessed using C:N:P stoichiometry.


Results: Soil concentrations of all studied nutrients were relatively low but were significantly and directly correlated to SOC concentrations. SOC and nutrient concentrations were the highest in the topsoil (0-10 cm) and increased with plantations age. Acacia foliage delta N-15 values were >6%o and varied little with plantations age. Soil C:N and C:P ratios did not differ between grassland and plantations and only 0-10 cm layer N:P ratios showed significant differences between grassland and plantations.


Discussion: The results indicated that soil fertility in the Sahel region is strongly related to SOM contents and therefore highlighting the importance of trees in the landscape. The higher mineral nutrient concentrations in the topsoil of the plantations may be an indication of ’nutrient uplift’ by the deeper roots. The high foliar delta N-15 values indicated that N(2 )fixation was not an important contributor to soil N contents in the plantations. The accretion of soil N cannot be explained by deposition but may be related to inputs of excreted N brought into the area annually by grazing and browsing animals. The soil C:N:P stoichiometry indicated that the plantations may be limited by P and the grasslands limited by N.


英文关键词Drylands Soil nutrients Woodland savanna Nitrogen isotopes Sahel Senegalia senegal
类型Article
语种英语
国家Finland ; Sudan ; Chile ; England
收录类别SCI-E
WOS记录号WOS:000438137900006
WOS关键词NATURAL-ABUNDANCE ; PRECIPITATION GRADIENT ; LAND DEGRADATION ; IMPROVED FALLOWS ; FARMING SYSTEMS ; ORGANIC-MATTER ; C-4 VEGETATION ; NUTRIENT ; SENEGAL ; TREES
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/212035
作者单位1.Univ Helsinki, Viikki Trop Resources Inst, Dept Forest Sci, Helsinki, Finland;
2.Univ Khartoum, Fac Forestry, Khartoum, Sudan;
3.Univ Helsinki, Dept Forest Sci, Helsinki, Finland;
4.Univ Catolica Santisima Concepcion, Fac Sci, Dept Environm Chem, Concepcion, Chile;
5.Imperial Coll London, Dept Life Sci, Ascot, Berks, England;
6.Univ Eastern Finland, Dept Environm & Biol Sci, Kuopio, Finland
推荐引用方式
GB/T 7714
Abaker, Wafa E.,Berninger, Frank,Saiz, Gustavo,et al. Linkages between soil carbon, soil fertility and nitrogen fixation in Acacia senegal plantations of varying age in Sudan[J],2018,6.
APA Abaker, Wafa E.,Berninger, Frank,Saiz, Gustavo,Pumpanen, Jukka,&Starr, Mike.(2018).Linkages between soil carbon, soil fertility and nitrogen fixation in Acacia senegal plantations of varying age in Sudan.PEERJ,6.
MLA Abaker, Wafa E.,et al."Linkages between soil carbon, soil fertility and nitrogen fixation in Acacia senegal plantations of varying age in Sudan".PEERJ 6(2018).
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