 A land of green fields for crop cultivation and cattle rearing limits the space available for the establishment of native wild species . Hedgerows , however , traditionally used for maintaining and demarcating land boundaries , act as a refuge for native wild flora . This ecosystem stretches across the countryside and acts as a network of connections to preserve remnants of the ecosystem that once covered the island . Subsidies under the Common Agricultural Policy , which supported agricultural practices that preserved hedgerow environments , are undergoing reforms . The Common Agricultural Policy had in the past subsidised potentially destructive agricultural practices , for example by emphasising production without placing limits on indiscriminate use of fertilisers and pesticides ; but reforms have gradually decoupled subsidies from production levels and introduced environmental and other requirements . 
 A land of green fields for crop cultivation and cattle rearing limits the space available for the establishment of native wild species . Hedgerows , however , traditionally used for maintaining and demarcating land boundaries , act as a refuge for native wild flora . This ecosystem <a href='uninflect' title='1'><mark>stretches</mark></a> across the countryside and <a href='uninflect' title='2'><mark>acts</mark></a> as a network of connections to preserve remnants of the ecosystem <a href='null_relcl' title='3'><mark>that</mark></a>once covered the island . Subsidies under the Common Agricultural Policy , which supported agricultural practices <a href='null_relcl' title='4'><mark>that</mark></a>preserved hedgerow environments , are undergoing reforms . The Common Agricultural Policy <a href='been_done' title='5'><mark>had</mark></a> in the past subsidised potentially destructive agricultural practices , for example by emphasising production without placing limits on indiscriminate use of fertilisers and pesticides ; but reforms <a href='been_done' title='6'><mark>have</mark></a> gradually decoupled subsidies from production levels and introduced environmental and other requirements . 
A land of green fields fir crop cultivation and cattle rearing limits the space available fa the establishment of native wild species . Hedgerows , however , traditionally used for maintaining and demarcating land boundaries , act as a refuge for native wild flora . This ecosystem stretch across da countryside and act as a network of connections to preserve remnants of tdaecosystem once covered the island . Subsidies under thdaommon Agricultural Policy , which supported agricultural practices preserved hedgerow environments , r undergoing reforms . Thedammon Agricultural Policy done in the past subsidised potentially destructive agricultural practices , for example by emphasising production without placing limits on indiscriminate use of fertilisers and pesticides ; but reforms done gradually decoupled subsidies from production levels and introduced environmental and other requirements .