FARMLAND HABITAT ACTION PLAN
SURREY
Final Draft (28.11.01)
Farmland Habitat Action Plan
This plan has been developed as part of a series of county specific Habitat Action plans, all constituent elements of the Surrey Biodiversity Action Plan. It is intended to inform a range of people including farmers, landowners, conservationists and the general public about the potential high conservation value of farmland It is also designed to offer practical advice to farmers as to how farm management techniques can be adjusted to benefit wildlife. The document should help inform the decision-makers at local government level and nationally as to the value of farmland for biodiversity in Surrey, drawing attention to the threats Surrey’s farmland is facing from development and the wider implications of structural change in the industry.
1) Habitat Definition
Due to the occurrence of a range of semi-natural habitats upon and adjoining Surrey’s farmland, it may be necessary to refer to the other Surrey Habitat Action Plans for additional information. Plans of particular relevance in Surrey include Chalk Grassland, Floodplain Grazing Marsh, Unimproved Neutral and Acid Grassland, Wetland, and Woodland.
Arable – Land that is cultivated, including horticultural land and improved grass leys as part of the arable rotation.
Improved grassland - Referring to types of improved grassland – e.g. perennial ryegrass leys and related grassland. Grassland that has undergone intensive management and treatment. Specialised grass-dominated species poor swards throughout lowland Britain. Highly productive short-term agricultural grasslands used for grazing and mowing in rotation with arable farming.
Boundary features – Field boundaries and the associated margins - Hedges, cultivated, grass or grass/wildflower strips, tracks, fences, walls, ditches, banks, rivers and streams. The UK BAP identifies two priority habitats:
• Cultivated cereal field margins
• Species-rich ancient hedgerows
The Biodiversity of Surrey’s Farmland
Farmland can offer a wide variety of potential habitats for many priority UK Biodiversity Action Plan species. However farmland is a working part of the landscape and must be economically viable. This makes the Farm HAP unique, as it must strike a balance between the need for a profitable farm business and the demands of the biodiversity that relies upon that farmland.
There are many species that through hundreds of years of farming have become dependent on the farmed landscape and its associated changes throughout the year. Due to agricultural policy and changes in technology, the more traditional farming methods involving for example, careful hedge management for stock control, low input, diverse rotational cropping, undersowing crops and winter stubbles have become less common. We have therefore, over the last 50 years experienced a rapid decline in the biodiversity dependent upon the farmed landscape.
This HAP addresses the fact that improvement of biodiversity on farmland is dependent upon on a fundamental change in awareness of the role farms have in safeguarding biodiversity. Simple small scale, cost free changes to management can make a large impact coupled with continued or renewed management of farmland features (e.g. hedgerows). Each farm should be aware of the impact their business has on biodiversity and how a balance can be struck to ensure continued profitable farming is coupled with retention and improvement of sustainable biodiversity levels in the next century.
Brief Description of the Wildlife Interest in each Habitat.
Arable:
• Nearly 300 types of wild plant grow upon tilled land, many of which are annuals that are adapted to exploiting bare ground and with long-lived seeds. Annual weeds are often considered to be unacceptable crop competition, but some of them are now amongst our rarest plants;
• Most of the insect species that occur on arable land are harmless to the crop, many are beneficial. Over 1000 different insect species spend part of their life cycles in cereal fields and 150 different types of spider have been found in them. The vast majority of these species do no harm to the farm operation and are often beneficial. They include crop pollinators, bees and flies as well as predators such as ground beetles;
• There are 350 species of non-specialist aphid predators found in cereal crops, ladybirds and hoverflies are common examples. These invertebrates are also potential food for gamebird chicks as well as other birds such as skylark and lapwing and mammals such as wood mice or shrews;
• The crop height, density and structure is also crucial to the diversity of species on the arable field.
• The stage of growth determines the ease by which the various species can move through the crop, or use it as cover. During the breeding season several birds choose to nest in arable fields (e.g. the skylark), they may chose to move between crop types depending on the time of year – generally whichever crop is below 30cm;
• The timing of sowing and cultivation is another factor that will affect the wildlife on arable land. For example autumn sown crops become too tall and dense for the birds to nest. These birds have declined as a result of the autumn sowing and this is compounded by the disappearance of mixed farming practices.
Field Margins – of which there are two types:
Grass Field Margins
• A strip of un-cropped land consisting of perennial grasses and other wild plants at the base of the hedge or along the fenceline can have great value for wildlife especially when it adjoins another hedge, pond or other habitat feature;
• Margins provide a habitat for small mammals and insects, including those that prey on crop pests. It has been estimated that a single tussock of soft hair grass can overwinter more than 1000 individual insects, including crop pest predators;
• A grass field margin of high biodiversity value will generally be at least 1 metre wide and contain perennial grasses and herbs, whereas many existing margins of little value contain annuals such as barren brome, cleavers and blackgrass;
• Margins can be used to buffer existing valuable habitats from farm operations adding to their role in benefiting biodiversity;
Cultivated Field Margins
• A strip of cultivated land managed to provide ideal conditions for rare arable plants, such as Venus’s looking glass, round and sharp-leaved fluellen, grey field speedwell, lesser snapdragon, corn marigold and prickly poppy.
• Many of these plants were once widespread and considered to be problem weeds, but are now amongst Britain’s rarest plants.
• The margin is cultivated in either the autumn or spring to provide conditions in which the seed bank of arable plants will germinate. The majority of these plants are annual and thus rely upon repeated cultivation.
Hedgerows
• Hedgerows are an important habitat feature in their own right (both) in terms of the range of plants that they contain and the biodiversity supported;
• They provide corridors of habitat that link across the wider landscape, providing nesting sites, shelter from predators and food in the form of nectar, berries and foliage;
• If properly managed the more recently planted hedges are still extremely valuable for wildlife;
• All hedgerows can act as links between other valuable habitats reducing the effects of fragmentation or ‘ islandization’;
• A rare species particularly associated with Surrey’s hedgerows is the brown hairstreak butterfly. It feeds on blackthorn and other members of the plum family. Annual trimming of hedgerows causes the eggs to be destroyed before the butterfly can complete its life cycle. Consequently the minimum requirement is that the hedge is left uncut at least every other year. Careful hedge management will of course benefit a range of other species as well as butterflies;
• There are many forms of hedge in the county, some being ancient and often associated with parish boundaries, supporting a wide range of shrubs. Others dating from the enclosure acts are less diverse, while some represent the remnants of ancient woodland that was left after fields were cut from the woods that once covered much of the county. These wide belts known as shaws are highly distinctive in Surrey and in many cases are disappearing through neglect;
• Sedentary insects and mammals can be supported by diverse ancient hedgerows which represent the last remaining fragments of larger woodland habitats that have been lost around them.
Improved Grassland
• Although little biodiversity is associated with improved grasslands they do have an important landscape and archaeological value. There are potential gains to be made with improved grassland; these include the creation of buffer strips to increase the value of the field edges and its restoration to semi natural grassland.
2) Current Distribution and Status
The latest DEFRA census figures provide statistical information about Surrey’s farmland. It is estimated that the area of agricultural land in Surrey is 62,839 hectares (37.5 % of the county), this area represents 5.3% of the total area of agricultural land in the South East. There has been a decline in agricultural land use over the past 20 years. This is of great concern for the wide range of species that are dependent on farmland.
Surrey is a small county (approximately 168,000 hectares). It’s proximity to London increases other demand on the land, the relatively low percentage of farmed land in the county highlights the importance of keeping Surrey farming, as so many species are dependant on the farm as their habitat.
Table: 1 % Change in Agricultural landuse in Surrey over 22 years.
1975 1980 1997
Farmland in Surrey (Ha) 71612 70934 62839
% of Surrey that is farmland
43 % 42% 37.5%
% Change since 1975 -0.9% -12.5%
Figure 1: Decrease of farmland (ha) in Surrey
The table below highlights the distribution of agricultural land ownership within Surrey. When considering biodiversity it is important to note that relatively large amounts of land are owned by a low number of large holdings, thus highlighting the importance of commitment to farmland biodiversity by each landowner. Figure 1 helps to highlight this point further. In Surrey, 145 individual holdings cover 50% of the farmed land. 24 farms cover 20% of the farmed land. The vast majority of holdings are under 20 ha.
Major impacts could be made to the county’s farmland biodiversity by actions undertaken on only 145 sites.
Figure 2 – Breakdown of holding size and ownership in Surrey
Size of holdings Total Holdings Total Hectares % Holdings % Hectares
> 300 24 11046 2 18
200-300 32 7455 3 12
100-200 89 12820 5 20
50-100 189 13018 11 21
0-20 965 7283 59 12
Table 2 – All holdings and farmland in Surrey
334 farms cover 71% of farmland in Surrey, 145 covers 50%
24 farms make up 18% of farmed land.
Table 3: Types of holdings within Surrey
Farm Type England (%) South East (%) Surrey (%)
Dairying 14.0 7.3 14.6
Cattle and Sheep 21.6 12.8 24.4
Cropping 44.9 50.5 25.6
Pigs & Poultry 0.9 1.1 1.5
Horticulture 1.1 3.0 3.2
Mixed and Other Types 17.5 25.4 30.6
Surrey has a higher than average number of mixed farms and it also has a higher than average proportion of dairy farms when compared to the South East.
The above data is from the Surrey Farm Study 1999
Important Features of Farming in Surrey
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- farming character null
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- focus attention on the potential and existing biodiversity value of Surrey’s farmland. null null null null
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- enhance the condition of Surrey’s existing ancient hedgerows and maintain their extent across the county. null null null null
Version 1.5 last modified by Sue Webber on 05/09/2007 at 14:01
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