Decomposition of pea and maize straw in Pakistani soils along a gradient in salinity

Sher, Muhammad; Müller, Torsten; Joergensen, Rainer Georg

doi:10.1007/s00374-005-0068-z

Cited by 91 publications

(49 citation statements)

References 43 publications

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“…The positive and significant relationship of C mic with C Org suggests that C mic can be used as a sensitive and early indicator of changes in the availability of C Org especially the active organic pool (Powlson et al 1987;Landgraf and Klose 2002;Weil 2000, Islam et al 2000). Since organic matter and microbial activity are typically related to each other (Tables 1 and 2), a significant descrease in organic matter probably intensifies the adverse effects of salinity on C mic (Muhhamad et al 2006). …”

Section: Resultsmentioning

confidence: 99%

Secondary salinity effects on soil microbial biomass

et al. 2010

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Secondary soil salinilization is a big problem in irrigated agriculture. We have studied the effects of irrigation-induced salinity on microbial biomass of soil under traditional cotton (Gossypium hirsutum L.) monoculture in Sayhunobod district of the Syr-Darya province of northwest Uzbekistan. Composite samples were randomly collected at 0-30 cm depth from weakly saline (2.3± 0.3 dS m −1 ), moderately saline (5.6±0.6 dS m −1 ), and strongly saline (7.1±0.6 dS m −1 ) replicated fields, 2-mm sieved, and analyzed for pH, electrical conductivity, total C, organic C (C Org ), and extractable C, total N and P, and ), microbial biomass (C mic ). The Na + and Cl − concentrations were 36-80% higher in strongly saline compared to weakly saline soil. The C Org concentration was decreased by 10% and C Ext by 40% by increasing soil salinity, whereas decrease in C mic ranged from 18-42% and the percentage of C Org present as C mic from 8% to 26%. We conclude that irrigation-induced secondary salinity significantly affects soil chemical properties and the size of soil microflora.

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Section: Resultsmentioning

confidence: 99%

Secondary salinity effects on soil microbial biomass

et al. 2010

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“…Several studies showed that increasing salinity correspond to decreasing microorganism activity (van Bruggen and Semenov, 2000;Rietz and Haynes, 2003;Sardinha et al, 2003;Muhammad et al, 2006;Wichern et al, 2006). The results described herein are in line with these findings: in fact, daily percentages of mass loss recorded during the spring of 2012 in correspondence of higher levels of conductivity (Table 4) did not differ from the autumnal values and are significantly lower than those observed in the previous years ( Figure 3) and the gap between autumn and spring k-values was lower than the one observed for previous years (Figure 2c) with the spring value close to the limit between medium and fast decay rate classes reported by Petersen and Cummins (1974).…”

Section: Physical Chemical Data and Nutrientsmentioning

confidence: 99%

Seasonal and multi-annual patterns ofPhragmites australisdecomposition in a wetland of the Adriatic area (Northeast Italy): a three-years analysis

Bertoli

Brichese

Michielin

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

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-Wetlands are one of the most biologically productive ecosystems, in which reedbeds of Phragmites australis are an essentially detritus-based system where litter decomposition is a fundamental process. This study represents a three year dataset describing cyclic trends of Phragmites australis leaf litter breakdown in a temporary and managed environment. For three years, 45 days field experiments were seasonally performed, using leaf bag technique within a large managed temporary pond (Natural Reserve of the Isonzo River Mouth, Northeast Italy), in order to analyze spatial and temporal variation in decomposition processes, to search for patterns on seasonal and inter-annual time scale and to infer the relevance of the main environmental features (physical and chemical) on decomposition dynamic. During the three years of analysis, decay rates (k) ranges were 0.0066-0.0075 days −1 in autumn, 0.0108-0.0158 days −1 in spring and k = 0.0168 days −1 in summer. Average mass loss per day % range was 0.97-1.31% in autumn, 1.12-2.04% in spring and 1.79-2.06% in summer. A well-defined seasonal cycle was observed through the study years as result of the drought-reflooding dynamic and the highest percentage (91.1%) of the average mass loss per day % variability was explained above all by rainfall, temperature and conductivity. Key-words:Leaf bag / wetland / seasonal dynamic / temporary pond / decomposition rate Résumé -Schémas saisonnier et pluriannuel de décomposition de Phragmites australis dans une zone humide de la région adriatique (Italie du Nord) : une étude de trois ans. Les zones humides sont parmi les écosystèmes les plus productifs, dont les roselières à Phragmites australis constituent un système basé essentiellement sur les détritus, où la décomposition de la litière représente un processus fondamental. Cette étude analyse un ensemble pluriannuel de données qui décrit les tendances cycliques relatives à la décomposition de Phragmites australis dans un milieu temporaire d'eau douce sujet à la gestion. Pendant trois ans, 45 jours d'expériences sur le terrain ont été effectués de façon saisonnière, en utilisant la technique du sac de feuilles dans un grand étang temporaire géré (Réserve Naturelle de l'embouchure de la rivière Isonzo, Italie du Nord), afin d'analyser les variations spatiales et temporelles dans les processus de décomposition, à la recherche de modèles à l'échelle temporelle saisonnière et inter-annuelle et d'en déduire la pertinence des principales caractéristiques environnementales (physiques et chimiques) sur la dynamique de la décomposition. Au cours des trois années d'analyse, les taux de décomposition (k) étaient 0,0066-0,0075 jours −1 à l'automne, 0,0108-0,0158 jours −1 au printemps et k = 0,0168 jours −1 en été. La perte moyenne de masse par jour était de 0,97 à 1,31 % en automne, 01,12 à 02,04 % au printemps et de 1,79 à 2,06 % en été. Un cycle saisonnier bien défini a été observé au cours des années d'études résultant de l'alternance assec-mise en eau. Le pourcentage le plus élevé (...

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“…Nevertheless, most estimates of symbiotic N 2 fixation rely on shoot N only (Carranca et al 1999a, b;Herridge et al 2008;Muhammad et al 2006;Peoples et al 2001). Limited knowledge on the contribution of belowground tissues to the N harvest index and fertilizer N value is partly due to difficulties in undertaking quantitative studies on belowground inputs.…”

Section: Introductionmentioning

confidence: 99%

Underestimated role of legume roots for soil N fertility

Carranca

Torres²,

Madeira³

2015

Agron. Sustain. Dev.

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Nitrogen (N) is a major fertilizing element for plants. The distribution of N in legumes is influencing the efficiency of the next crop. Nitrogen storage in legumes is actually estimated by N fixation in shoots, whereas there is little knowledge on the contribution of roots and nodules to legume N and soil N. Here, we studied the contribution of roots and nodules of grain and pasture legumes to plant N and soil N in Mediterranean fields. Experiments were run under rainfed conditions for a 2-year period in three regions of Portugal. Entire plants including top plant and visible roots and nodules were sampled at the end of the growing seasons for grain legumes, sweet and yellow lupine, and over two harvests in case of pastures. N 2 fixation was measured for grain legumes and pasture legumes using 15 N tracing. Our results show that aboveground N concentration did not vary among legumes, but differed in the belowground tissues. Field studies show that 7-11 % of total legume N was associated with roots and nodules. Data also show an allocation of 11-14 kg N fixed t −1 belowground dry matter in indeterminate legumes, which represents half the amount of total aboveground plant. This finding demonstrates that investigation relying only on shoot N underestimates the role of legumes for soil N fertility.

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Decomposition of pea and maize straw in Pakistani soils along a gradient in salinity

Cited by 91 publications

References 43 publications

Secondary salinity effects on soil microbial biomass

Secondary salinity effects on soil microbial biomass

Seasonal and multi-annual patterns ofPhragmites australisdecomposition in a wetland of the Adriatic area (Northeast Italy): a three-years analysis

Underestimated role of legume roots for soil N fertility

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