NDLI: Climate change impacts of legume-grass swards: implications for organic farming in the Federal State of Brandenburg, Germany

Content Provider	Springer Nature Link
Author	Bloch, Ralf Wechsung, Frank Heß, Jürgen Bachinger, Johann
Copyright Year	2014
Abstract	Multispecies legume-grass swards (LGS) within crop rotations are the primary source for nitrogen and livestock forage in organic farming systems (OFS) in Europe. At the same time, LGS are very susceptible to the effects of climate change on OFS in dryer regions. In order to predict changes in annual and seasonal LGS yields, the number and dates of LGS cuts and drought impact, an empirical statistical yield model based on alfalfa (A) and red clover (B) was applied to two of the driest areas within Germany: the ‘Spreewald’ (SP), with sandy soils only suited for red clover and the ‘Uckermark’ (UM) with sandy loams. Weather data series from 1972 to 2008 and two regional warming scenarios for 2062–2092, namely ‘Dry’ and ‘Wet’, were used to calculate the impacts. Only the scenario ‘Dry’ predicts an annual yield reduction (about 20 %), for both regions. This impact can be attributed to (1) the first cut is early by four weeks (decreasing the yield by 0.5 t ha−1), (2), the third cut is often delayed (caused by water deficiency) and (3) eventual impracticality of a fourth cut. In contrast, the second cut increased by 1 t ha−1 for ‘Wet’. In SP, frequent severe drought impacts are predicted for red clover LGS. This deleterious impact of the ‘Dry’ scenario can be partially compensated only in UM when alfalfa is used, which showed lower susceptibility to drought. Along with the predicted yield reduction, an increased vulnerability of organic farms in both study regions cannot be prevented.
Starting Page	405
Ending Page	414
Page Count	10
File Format	PDF
ISSN	14363798
Journal	Regional Environmental Change
Volume Number	15
Issue Number	2
e-ISSN	1436378X
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-07-30
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Yield modelling Drought impact Vulnerability Cropping systems Climate Change Climate Change/Climate Change Impacts Oceanography Geography (general) Regional/Spatial Science Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change

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