Influence of Site Preparation and Tending on Larix kaempferiGrowth for Northern Sub-tropical Alpine Area

The influence o f site preparation and tending onLarix kaempf eri grow th w as studied, based on the expermi enta lforest of 4×3 site preparation and tending methods set up during E ighth Five??year??plan period. The resu lts show ed thatdifferent site preparationmethods affected the grow th and surviva l rate ofLarix kaempf eri, especially significantly affectedthe annual grow th after afforestat ion. The suggested site preparat ion for short rotat ion industrial plantation o f Larixkaempferi in northern sub??tropical alpine areaw as hole reclamat ion w ith A1 ( 60 cm ×60 cm×35 cm), ofwhich the diame??ter, he igh,t vo lume and standing stock at15??year??o ld w ere 3. 36%, 3. 61%, 12. 29%, and 38. 98% respectively h igher thanthat of A0. D ifferences in tree grow th among 3 tending methods w ere not statistica lly significan.t And the interaction ofsite preparation and tend ing affected the grow th insignificantly, but the DBH, tree he ight volume and standing stock of A1B2 at 15－year－o ld w ere 12. 56%, 14. 65%, 53. 13% and 68. 16% respectively higher than that ofA0B2. Therefore, A1B2 site preparation and tending combinedmethod w as suggested for the area for short rotation industrial plantation ofLarixkaempferi, name ly ho le reclamation w ith 60 cm ×60 cm ×35 cm and tw ice a year tending, one in Julyw ith ho le reclama??t ion and grass??cutting, and the another one in Augustw ith clear cutting.