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Contribution of feeding by european pine sawfly neodiprion sertifer larvae to litter production and element flux in scotch pine pinus sylvestris plantations



Contribution of feeding by european pine sawfly neodiprion sertifer larvae to litter production and element flux in scotch pine pinus sylvestris plantations



Canadian Journal of Forest Research 15(3): 484-487



The contribution of larvae of the European pine sawfly, Neodiprion sertifer (Geoff.), to litter fall and element input was determined in 2 contiguous 25 yr old plantations of Scots pine (Pinus sylvestris) near Glencairn, Ontario, Canada, in 1972. Tree spacings were 1.2 .times. 1.2 and 1.8 .times. 1.8 m. Tree diameters, numbers of needle-bearing branches per tree, and the number of larval colonies per tree were greater in the less dense plantation. On the other hand, there was no difference between plantations with respect to tree height, number of needles per branch, number of larvae per colony or percent defoliation. For the denser and less dense plantations, frass was the largest insect-derived component of litter fall at 804 and 1255 kg ha-1, respectively; needles constituted the major tree component of litter fall at 1107 and 929 kg ha-1, respectively, and the total combined contribution of tree and insect material to litter fall was 2395 and 2744 kg ha-1, respectively. Average element input (kg/ha) to the soil via frass for the 2 plantations was greatest for N (6.9), followed by (5.0), Ca (4.1), P (0.8) and Mg (0.6).

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