Ecological safe management of terraced rice paddy landscapes

Lennartz, Bernd; Horn, Rainer; Duttmann, Rainer; Gerke, Horst H.; Tippkötter, Rolf; Eickhorst, Thilo; Janssen, Ines; Janssen, Manon; Rüth, B.; Sander, Till; Shi, Xinjie; Sumfleth, Kay; Taubner, Heidi; Zhang, Bo

doi:10.1016/j.still.2008.07.010

Cited by 38 publications

(31 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The trend (ponded OSP > others > non-ponded NSP) at the 300 kPa, a matric potential beyond which soil water becomes difficultly available to plants in most soils, highlights the relative importance of seasonal puddling and a ponded soil condition. These differences, even with the inherently slow hydraulic conductivity of the soil, could be linked to a gradual decrease in hydraulic conductivity of puddled soil as the sawah advanced in age (Lennart et al, 2009). The differences across the matric potentials of the present study support the views that the beneficial effects of puddling on soil hydrophysical properties are more pronounced in fine-textured soils (Kirchhof & So, 1996;Obalum et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Attempts to edaphologically explain such yield benefits due to the sawah system focused only on other beneficial attributes of the system, such as enhancement of soil chemical and fertility properties and good water control (Nwite et al, 2008;Issaka et al, 2009). It has been shown under Asian conditions that paddy soils exhibit a dynamic soil-water system which is driven by puddling, duration of ponding, and age of the paddy (Lennart et al, 2009), but such has yet to be checked for the increasingly popular sawah system in West Africa.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Long-term effects of lowland sawah system on soil physicochemical properties and rice yield in Ashanti Region of Ghana

Obalum

Oppong²,

Nwite

et al. 2012

Span. j. agric. res.

View full text Add to dashboard Cite

Lowland sawah is viewed as a sustainable alternative to traditional rice culture in West Africa. Sawah (a bund-demarcated, puddled, leveled, and water-regulated rice field) has received growing research attention lately, but no data exist yet on the system's long-term agronomic impact. In a clayey inland-valley soil in southern Ghana, 10-year-old sawah plots (OSP), fresh sawah plots (FSP), and non-sawah plots (NSP) were maintained under both ponded and nonponded conditions in 2007. The OSP enhanced soil status of exchangeable nutrients compared to NSP. There were relative improvements in soil bulk density, total porosity, and field moisture content (OSP ≥ FSP > NSP), with clear benefits of ponding over non-ponding in OSP. The NSP was so unsustainable that it showed less favourable values of these variables than an adjacent fallowed plot. These soil variables deteriorated with time, with significant differences in FSP. Soil moisture retention data for tension range of 0-300 kPa depicted the importance of puddling and ponding. These results highlight the agronomic benefits of continuous sawah-based rice production. Although the positive effects of puddling on the soil hydrophysical properties were largely responsible for the wide margin in yield between sawah and traditional systems, other yield-enhancing factors, particularly bunds for water control, were also lacking in the latter.Additional key words: age of sawah; moisture retention; Oryza sativa; ponded sawah plot; rice grain yield; seasonal puddling; soil bulk density. ResumenEfectos a largo plazo de las tierras bajas del sistema Sawah en la región Ashanti de Ghana sobre las propiedades fisicoquímicas del suelo y el rendimiento del arroz Las tierras bajas del sawah (campos de arroz encharcados y delimitados por lomos de inundación, dotados de una buena nivelación del terreno y regulación del agua) constituyen una alternativa sostenible al sistema tradicional de producción de arroz en África Occidental. El sawah ha despertado una creciente atención, pero aún no existen datos concretos sobre su impacto agronómico a largo plazo. En el año 2007, bajo un suelo arcilloso de valle interior, se llevaron a cabo unos ensayos de cultivo de arroz tanto bajo condiciones de inundación permanente como temporal, para comparar parcelas de sawah de 10 años de antigüedad (OSP) con otras de nueva implantación de sawah (FSP) y con parcelas no sometidas al sawah (NSP). Se observó un incremento de la fertilidad del suelo bajo OSP en comparación con NSP. Otras propiedades del suelo, como densidad aparente, porosidad total y contenido de agua a capacidad de campo mostraron únicamente mejoras relativas (OSP ≥ FSP> NSP), indicando los beneficios derivados del encharcamiento sólo en OSP. En NSP se obtuvieron peores resultados que en el caso de los barbechos adyacentes. En FSP,

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Long-term effects of lowland sawah system on soil physicochemical properties and rice yield in Ashanti Region of Ghana

Obalum

Oppong²,

Nwite

et al. 2012

Span. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…Recent studies identified such macropore systems as flow paths, and therefore revealed crack and root channels as well as earthworm burrows as responsible for water loss and solute leaching (Janssen and Lennartz 2008;Lennartz et al 2009). …”

Section: Plant Remains: Another Pathway Of Oc Transport Into Subsoilmentioning

confidence: 99%

Origin of Subsoil Carbon in a Chinese Paddy Soil Chronosequence

Bräuer

2013

azu_js_rc

View full text Add to dashboard Cite

ABSTRACT. Rice paddies are highly important agricultural soils in view of their relevance as major staple food provider in the world and their key role in the global carbon cycle, caused by special management practices. A soil chronosequence, consisting of paddy and upland soils, developed on reclaimed estuarine sediments in the Province of Zhejiang, China, was sampled to investigate the influence of duration of agricultural use (50 to 2000 yr) on soil composition. The uniform composition of the parent material provides the unique opportunity to compare the effects of different land management practices (paddy and non-paddy) on soil carbon dynamics and the origin of organic carbon (OC) in top-and subsoils, using 14 C measurements by accelerator mass spectrometry (AMS). The total soil organic carbon (TOC) was split into chemically defined pools of different mobility, namely the acid-and water-soluble fulvic acids (FA), the alkali-soluble humic acids (HA), and insoluble humin fraction. The more mobile HA and FA fractions contain significantly more 14 C than the corresponding TOC and humin, indicating a downward transport of OC in the subsoil. Plant roots with 14 C concentrations up to 128% of the modern standard, found far below the plough pan, reveal plant roots and root exudates as other direct sources of subsoil OC in paddy soils.

show abstract

“…Here rice cultivation started in coastal regions following land reclamation after dyke building at well dated times (Cheng et al, 2009;Chen et al, 2011), which allows for investigation of long-term evolutionary trends in rice paddy biogeochemistry. It is postulated that ongoing paddy soil evolution will continuously diminish the intrinsic heterogeneity of young paddy soils and ultimately establish homogeneous soil biogeochemical conditions as a consequence of destruction of aggregates and macropores (Ringrose-Voase et al, 2000) and by formation of an efficient plough pan (Lennartz et al, 2009) via puddling. Verification of paddy soil homogeneity in this investigation will contribute to validating pedogenic and biogeochemical studies of the same chronosequence conducted previously (Cheng et al, 2009;Bannert et al, 2011a, b;Chen et al, 2011;Roth et al, 2011;Wissing et al, 2011).…”

Section: Mueller-niggemann Et Al: Intra-versus Inter-site Macroscmentioning

confidence: 99%

Intra- versus inter-site macroscale variation in biogeochemical properties along a paddy soil chronosequence

Mueller-Niggemann

Bannert²,

Schloter

et al. 2012

Biogeosciences

View full text Add to dashboard Cite

Abstract. In order to assess the intrinsic heterogeneity of paddy soils, a set of biogeochemical soil parameters was investigated in five field replicates of seven paddy fields (50, 100, 300, 500, 700, 1000, and 2000 yr of wetland rice cultivation), one flooded paddy nursery, one tidal wetland (TW), and one freshwater site (FW) from a coastal area at Hangzhou Bay, Zhejiang Province, China. All soils evolved from a marine tidal flat substrate due to land reclamation. The biogeochemical parameters based on their properties were differentiated into (i) a group behaving conservatively (TC, TOC, TN, TS, magnetic susceptibility, soil lightness and colour parameters, δ 13 C, δ 15 N, lipids and n-alkanes) and (ii) one encompassing more labile properties or fast cycling components (N mic , C mic , nitrate, ammonium, DON and DOC). The macroscale heterogeneity in paddy soils was assessed by evaluating intra-versus inter-site spatial variability of biogeochemical properties using statistical data analysis (descriptive, explorative and non-parametric). Results show that the intrinsic heterogeneity of paddy soil organic and minerogenic components per field is smaller than between study sites. The coefficient of variation (CV) values of conservative parameters varied in a low range (10 % to 20 %), decreasing from younger towards older paddy soils. This indicates a declining variability of soil biogeochemical properties in longer used cropping sites according to progress in soil evolution. A generally higher variation of CV values (>20-40 %) observed for labile parameters implies a need for substantially higher sampling frequency when investigating these as compared to more conservative parameters. Since the representativeness of the sampling strategy could be sufficiently demonstrated, an investigation of long-term carbon accumulation/sequestration trends in topsoils of the 2000 yr paddy chronosequence under wetland rice cultivation restricted was conducted. Observations cannot be extrapolated to global scale but with coastal paddy fields developed on marine tidal flat substrates after land reclamation in the Zhejiang Province represent a small fraction (<1 %) of the total rice cropping area. The evolutionary trend showed that the biogeochemical signatures characteristic for paddy soils were fully developed in less than 300 yr since onset of wetland rice cultivation. A six-fold increase of topsoil TOC suggests a substantial gain in CO 2 sequestration potential when marine tidal wetland substrate developed to 2000 yr old paddy soil.

show abstract

Ecological safe management of terraced rice paddy landscapes

Cited by 38 publications

References 55 publications

Long-term effects of lowland sawah system on soil physicochemical properties and rice yield in Ashanti Region of Ghana

Long-term effects of lowland sawah system on soil physicochemical properties and rice yield in Ashanti Region of Ghana

Origin of Subsoil Carbon in a Chinese Paddy Soil Chronosequence

Intra- versus inter-site macroscale variation in biogeochemical properties along a paddy soil chronosequence

Contact Info

Product

Resources

About