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In one Shape file I have created 1200 buffer zones Around coordinates. I created a field and calculated the buffer zones area in hectares. Then I clipped different landcover layers to the buffer zones. Now I want to calculate How many hectares of eg. Forest there are in Each buffer zone And afterwords the amount of felds, And so on.

The calculations shall be done in model builder..

Can anybody help me please...?

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Is your landcover raster or vector? –  Aaron May 14 '13 at 18:35
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2 Answers

You can use the Intersect tool to intersect your land cover layers with your buffer layer. You can then recalculate the areas of each land cover layer within each buffer.

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Follow the intersect and area calculation above with Summary Statistics, using the landcover class, buffer size, and unique ID field and/or X and Y fields for the coordinate as the case fields to help aggregate the calculation that sums the area. –  ccn May 14 '13 at 19:50
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The 5.2.1 Multiple Ring Landscapes ACCRU Tool can be used/modified to automate incremental buffering, intersecting, and dissolving. You will need to apply a conversion factor from the map units to hectares.

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