Andreas Wahren

• Dr.rer.nat.
• Managing Director at Dr. Dittrich & Partner Hydro-Consult GmbH

In 2011, MoorFutures® were introduced as the first standard for generating credits from peatland rewetting. We developed methodologies to quantify ecosystem services before and after rewetting with a focus on greenhouse gas emissions, water quality, evaporative cooling and mire-typical biodiversity. Both standard and premium approaches to assess th...

Neben der klassischen Standortskartierung nach dem ostdeutschen Verfahren werden in Sachsen seit mehreren Jahren Methoden des Digital Soil Mapping angewendet. Einen Schwerpunkt bildet die kontinuierliche Aufarbeitung von Altdaten. Deren Georeferenzierung, Harmonisierung und Verfügbarmachung erfolgt sowohl in modernen Dokument-Management-Systemen au...

Sphagnum farming provides a sustainable wet land use alternative for drained peatland agriculture. Since 2011 Sphagnum has been cultivated on formerly drained bog grassland at Hankhauser Moor in northwest Germany. The site has been rewetted and is equipped with an automatic irrigation system which controls the inflow and outflow of water. We used m...

Die globale Moorfläche beträgt geschätzte 4 Millionen km². 15% davon befinden sich in der gemäßigten Zone und den (Sub)Tropen und sind entwässert, 80% davon für konventionelle Land- und Forstwirtschaft. Die Entwässerung von Mooren führt stets zu irreparablen Schäden. Moorsackung und Degradation des Moorbodens gefährden die langfristige Nutzbarkeit...

Peatlands cover some 4 million km² worldwide. Approximately 15% of this area – particularly in the temperate zone and the (sub)tropics – is drained, largely to be used for conventional agriculture and forestry. Drainage leads to irreparable damage to peatlands. Subsidence and soil degradation frustrate long-term peatland utilisation and are respons...

This report presents the findings garnered during the ‘F+E’ (Research and Development) Project ‘Integrated Peatland Offset Standard: Certifying the ecological co-benefits of CO2 offsets from peatland rewetting’ (2011-2013), funded by the Federal Agency for Nature Conservation with the support of the Federal Ministry for the Environment. In this pro...

Land use change on arable land from conventional annual crops to short rotation coppice (SRC) affects the water balance of both the immediate site at which the change takes place and the area in which this plot of land is located. Presented in this paper are the results of two studies investigating the impact of SRC on the water balance at two diff...

In 2011, MoorFutures® were introduced as the first carbon credits from peatland rewetting. Financed by the German government, a recent research and development project expanded MoorFutures® to include additional quantified ecosystem services such as water quality improvement, flood retention, increased regional groundwater storage and evapotranspir...

MoorFutures® wurden im Jahr 2011 als erste Kohlenstoffzertifikate für Moorwiedervernässung eingeführt. Im Rahmen eines F+E-Projektes wurden die MoorFutures® weiterentwickelt. Mit der neuen Version werden weitere Ökosystemdienstleistungen (Wasserqualitätsverbesserung, Hochwasserrückhalt, Grundwasseranreicherung, Verdunstungskühlung) und die Erhöhung...

Am Beispiel längerfristiger hydrologischer und biogeochemischer Messungen und darauf gestützter Modellierung des Gebietswasserhaushalts wird für das Erzgebir- ge (Sachsen, Deutschland) der Einfluss der Waldböden auf wasserbezogene Öko- systemdienstleistungen verdeutlicht. Die Wasserqualität wird durch Überlagerung natürlicher Bodenprozesse (v.a....

Der internationale TEEB-Prozess (The Economics of Ecosystems and Biodiversity) zielt da-rauf ab, die Bedeutung der Natur sichtbarer zu machen und sie dadurch stärker bei Ent-scheidungen zu berücksichtigen. „Naturkapital Deutschland – TEEB DE“ möchte als nationa-ler Folgeprozess hierfür in Deutschland Impulse geben und so auch die Umsetzung der Ziel...

During the 20th century, afforestation resulted in plantations of Pine and Eucalypt becoming the main crops in north-central Portugal with associated and well-known soil water repellency (SWR). The aim of this study was to improve the insights in the temporal dynamics and abrupt transitions in water repellency of the topsoil and the mechanism that...

Forests show, compared to other land uses, in many cases good water retention potential. This is however limited. Whether additional forest area in a catchment leads to a reduction of flooding depends on the pre-event atmospheric conditions, the soil characteristics at the afforested site, the duration and intensity of the rain storm event, and loc...

Assessment of catchments water retention potential in the landscape is a common part of management plans as components of integrated flood risk management strategies. For forest land use, it has been stated that the promotion of sustainable forest management and the increase of forest land via afforestation will considerably improve flood retention...

In response to the heavy flood in August 2002, the State of Saxony established a new protection category in its revised Water Act: the flood-generating. For the governmental enforcement a guideline was developed to assess the effectiveness of flood-reducing compensation measures on agricultural land. The law demands that inevitable degradations of...

In response to the heavy flood in August 2002, the State of Saxony established a new protection category in its revised Water Act: the flood-generating areas. For the governmental enforcement a guideline was developed to assess the effectiveness of flood-reducing compensation measures on agricultural land. The law demands that inevitable degradatio...

Combined hood and disk infiltrometer experiments were performed in conjunction with the laboratory measurement of soil water retention to quantify the impact on soil hydraulic properties of a mixed cropping rotation compared with pasture. The two sites were in adjacent fields on the same soil type. One site had been cropped for 2 yr. The other site...

Scaling of forest and water relations are mostly concerned with two diverse ­dimensions resulting from trade-off in various environmental and regional conditions. On one side, scaling is used to develop best forest management practice with the aim of reducing runoff and providing good quality water. In conditions of water scarcity, scaling is mostl...

This case study follows a straight forward approach to assess forest impact on water dynamics at different scales. Investigation in the catchment of the upper Mulde River (Saxony/Germany) explored firstly to the impact of afforestation measures on the soil hydraulic properties. ‘False chronosequences’ were used to quantify the time-dependent dynami...

Combined hood and disk infiltrometer experiments were performed in conjunction with the laboratory measurement of soil water retention to quantify the impact on soil hydraulic properties of a mixed cropping rotation compared with pasture. The two sites were in adjacent fields on the same soil type. One site had been cropped for 2 yr. The other site...

Land-cover changes cause a loss of natural vegetation in many parts of the world. In the Xishuangbanna (西双版纳) district (Yunnan (云南) Province), rubber plantations replace tropical rainforests covering already an area of about 10% of the study area (2007). There, land-use allocation is mostly driven by economic considerations. Thus, local planning au...

The 13th Workshop “Large-scale Hydrological Modeling” was held during 25–27 November 2009 in Dresden. Launched in 1997, this event provides a platform to present the state-of-the-art on large-scale hydrological modelling within the German-speaking community and to critically discuss current and future research approaches. The workshop was hosted by...

The opening up of China's industry towards market orientation has a distinct impact on natural resources as well as on social structures. The example of rubber introduction in Yunnan province (SW China) shows the mutual interdependencies between economy, natural resources, and social structures. We assess the impacts of rubber introduction and poss...

The investigation in the catchment of the Mulde (51°0'55" N, 13°15'54" E Saxony, Germany) researches the effect of afforestation measures on the soil hydraulic properties. The concept of a "false chronosequence" was used to quantify the time-dependent dynamical character of the forest impact. Four adjacent plots were identified at a test location w...

A small catchment (6,8 km²) in the recently defined flood originating areas (“Hochwasserent-stehungsgebiete” - SächsWG) in the Central Ore Mountains (Saxony, Germany) was analyzed to describe the development of the land-use to the present situation and its spatial distribution (historical background, site properties, subsidy policy etc.). From the...

The extreme summer flood in the Elbe River watershed initiated a debate on the role of forest conversion and afforestation as measures for preventive flood protection. To quantify the effect of forest conversion and afforestation on flood runoff from catchments reliable model calculations are essential. The article overviews the present state of ou...