Wissenschaftliche Publikationen

Hier finden Sie wissenschaftliche Publikationen über Wirkung der Kalkdüngung

Holland, 2018 - Liming impacts on soils, crops and biodiversity in the UK: A review

Abstract:
Fertile soil is fundamental to our ability to achieve food security, but problems with soil degradation (such as acidification) are exacerbated by poormanagement. Consequently, there is a need to better understandmanagement approaches that deliver multiple ecosystem services from agricultural land. There is global interest in sustainable soil management including the re-evaluation of existing management practices. Liming is a long established practice to ameliorate acidic soils and many liming-induced changes are well understood. For instance, short-termliming impacts are detected on soil biota and in soil biological processes (such as in N cycling where liming can increase N availability for plant uptake). The impacts of liming on soil carbon storage are variable and strongly relate to soil type, land use, climate and multiple management factors.
Liming influences all elements in soils and as such there are numerous simultaneous changes to soil processes which in turn affect the plant nutrient uptake; two examples of positive impact for crops are increased P availability and decreased uptake of toxic heavy metals. Soil physical conditions are at least maintained or improved by liming, but the time taken to detect change varies significantly.

Arable crops differ in their sensitivity to soil pH and for most crops there is a positive yield response. Liming also introduces implications for the development of different crop diseases and liming management is adjusted according to crop type within a given rotation. Repeated lime applications tend to improve grassland biomass production, although grassland response is variable and indirect as it relates to changes in nutrient availability. Other indicators of liming response in grassland are detected in mineral content and herbage qualitywhich have implications for livestock-based production systems. Ecological studies have shown positive impacts of liming on biodiversity; such as increased earthworm abundance that provides habitat for wading birds in upland grasslands.

Finally, understanding of liming impacts on soil and crop processes are explored together with functional aspects (in terms of ecosystems services) in a new qualitative framework that includes consideration of howliming impacts change with time. This holistic approach provides insights into the far-reaching impacts that liming has on ecosystems and the potential for liming to enhance the multiple benefits from agriculturally managed land. Recommendations are given for future research on the impact of liming and the implications for ecosystem services.

Wachendorf, C., 2015: englisch: Einfluss der Kalkung auf Abbau organischer Substanz

Zusammenfassung:
Short-term potential carbon (C) and nitrogen (N) mineralization of soil organic matter and belowground plant litter was determined in the top soil layer of a sandy soil of a short-rotation coppice (SRC) and the effect of addition of lime, mineral nitrogen and poplar roots was determined. Lime addition was equivalent to 1.2 mg CaCO3 g?1, mineral N and root litter were added corresponding to 6.8 ?g N g?1 and 13.8 mg roots g?1 soil respectively. Partitioning of carbon dioxide (CO2) derived from lime and soil organic matter (SOM) was calculated by using stable isotope analysis of the CO2. In addition, particulate organic matter (POM) as well as microbial biomass carbon and nitrogen were analyzed after 51 days of incubation.

Addition of lime decreased CO2 derived from organic matter in all treatments, but the level of decrease varied with N and root litter addition. Microbial biomass C and N increased with N addition in soil without root litter but decreased with root litter, nevertheless an immobilization of mineral N was especially high in soil amended with root litter. Particulate organic matter (POM) decreased by 41% of its dry weight in root litter amended soil.
Liming decreased decomposition of POM in these soils,whereas no effect was observed after addition of mineral nitrogen or mineral nitrogen and lime. These results show that liming has the potential to decrease C mineralization of humified organic matter as well as plant residues and that decreased mineralization of organic matter occurred after liming, even if mineral N was added.

Göttingen/Köln 1979 - Veränderung des Scher- und Kompressionsverhaltens von Ap-Horizont-Material aus Löß-Parabraunerden durch Kalkung / Change of shear resistance and compressibility of Ap-horizon material from loess-derived leached brown soil

 

Zusammenfassung: Standardisierte Formlinge aus Löß-Parabraunerde-Ap-Horizontmaterial wurden ohne und mit einem in 2 Stufen gesteigerten Kalkzusatz bei 3 Feuchtestufen Scher- und Kompressionstests bei steigender Normalspannung unterzogen. Die Kalkung bewirkte generell insbesondere eine Erhöhung des Anfangsscherwiderstandes und auch eine Verminderung der Kompressibilität. Diese gefügestabilisierende Wirkung wird auf das Flocken der Tonsubstanz an den Berührungsstellen der Schluffkörner in der Bodenmatrix zurückgeführt.

Summary: Standardised artificial bodies prepared from soil material of a loess-derived leached brown soil-Ap-horizon were tested with respect to their shear resistance and compressibility. The noncalcareous material was enriched with lime (2 steps), soil humidity changed (3 steps) and the normal pressure increased (4 steps). Liming generally caused an increased initial shear resistance and led to a lowering of compressibility. The effect of lime is interpreted as a result of flocculation of the clay particles at the points of contact between silt grains in the soil matrix.