Calibration of the yield tables for the main tree species in Hesse, Germany, using the data of the National Forest Inventory

摘要

Over the last decades forest growth has increased significantly compared to the past due to the change of environmental conditions. Though not only a large-scale improvement of site indices is observed, but also accelerated volume growth for a given site index. At the same time changed growth conditions and/or enhanced silvicultural treatments as staggered thinnings have caused diameter distributions, which differ significantly from those of the experimental plots used to develop the yield tables. Hence, the yield table based estimates for the periodic annual volume increment (PAIV) as well as the mean quadratic diameter (Dq) deviate increasingly from current measurements, which leads to a misspecification of values being substantial for forest management and valuation.