Eskişehir – Çatacık Yöresi Sarıçamlarında (Pinus sylvestris L.) Tohum Verimi

Ozet: Bu calisma ile   Eskisehir-Catacik   yoresi saricamlarinda   farkli   bonitet   ve   yaslarda,   aralama uygulanmis veya uygulanmamis toplam 15 deneme  alaninda, 6 yil sure ile (1974-1979) tohum verimi ve kalitesinin  saptanmasi  amaclanmistir.  Boylece,  ayni  yore  ve  deneme  alanlarinda,  daha  once  uc  yil  icin (1971-1973) saptanmis olan saricam tohum verimi kalite ve kantitesi ile tohum yillari, bu calisma sonucu 1974-1979  yillariyla  birlikte  9  yillik  (1971-1979)  periyodu  kapsayacak  sekilde  genisletilmistir.  Tohum veriminin  saptanmasi  icin  Sundiken  Daglariin  kuzey  aklaninda  saf,  ayni  yasli  ve  normal  kurulustaki saricam   populasyonlarindan  15   deneme   alani  secilmistir.   Deneme   alanlari   50mx50m   (0,25   hektar) boyutlarinda olup, orta yasli ve yasli deneme alanlarina 20’ser adet, genc deneme alanlarina ise 30adet tohum kapan yerlestirilmistir. Tohum kapanlarin agiz genisligi 1/10 m2 dir. Arastirma sonuclarina gore, genel olarak iyi  bonitet  saricam  populasyonlarinin tohum verimi  daha fazla bulunmustur. Ayni bonitet sinifinda en fazla tohum orta yas populasyonlardan elde edilmistir. Silvikulturel islemler (aralama) tohum verimini bir miktar artirmistir. Tohum veriminin yillara gore azalip cogalmasi, genel olarak tum deneme alanlarinda  ayni  yonde  olmustur.  Catacik  yoresinde  zengin  tohum  yillari  2-3  yilda  bir,  zengin  ve  orta tohum yillari birlikte dikkate alindiginda pespese veya 2 yilda bir olusmaktadir. Bos tohum oranlari bazi istisnalar disinda yasli mescerelerde ve zayif bonitetlerde daha fazla bulunmustur. Arastirma sonuclarina gore,  Catacik  yoresinde  ustun  nitelikli  dogal  saricam  populasyonlari  40-45  yaslarindan  sonra  tohum mesceresi    olarak    secilebilir.    Hatta    gereken    hallerde,    tohum    saglamada,    180-200    yaslarindaki populasyonlardan da faydalanmak olanaklidir. Anahtar Kelimeler: Tohum verimi, tohum yillari, saricam, Pinus sylvestris . Seed Crop of Scots Pine ( Pinus silvestris L.) in Eskisehir-Catacik Forest Region Abstract: This  article  describes  the  quantity  and  quality  of  seed  yields,  their  annual  variations  for populations of different site classes, age catagories and effects of silvicultural treatments in Pinus sylvestris in Eskisehir-Catacik forest region. The study covers a period of 6 years between the years 1974 and 1979. In one of the previous research which covered three years (1971-1973) at the same sample plots has been concluded and published (Boydak, 1975; Boydak, 1977). So together with this research 9 years (1971-979) of the seeding characteristics of Pinus sylvestris was obtained. The study area was located on the northern slopes of the Sundiken Mountains. Fiveteen sample plots were chosen in pure and even-aged scots pine stands with normal constitution to determine seed crop in Catacik region. Every sample plot had an area of 0.25 hectar (50x50 m). 20 seed traps each with a surface area of 1/10 square meter were systematically placed in the sample plots of middle aged and older selected stands, while 30 traps were placed in each young populations. The results indicated that, in general, seed yiled was higher in good site classes, and middle ages populations in scots pine. Silvicultural treatments (thinings) slightly increased the seed crop in Pinus sylvestris . Seed productivity of 15 populations showed the same paterns from year to year. Good seed years have repeated 2-3 years intervals. Moreover good seed years together with medium seed years have  occured  either  consecutive  years  or  every  two  years.  In  general,  empty  seed  percentages  were positively correlated with poor site classes and old stands. The results of the investigation revealed that seed stands should be chosen over 40-45 years of age in the natural scots pine stands with superior quality in Catacik region. When necessary seed collection could also  be  made from old  stands such as 180-200 years of age. Keywords: Seed crop, scots pine, Pinus sylvestris Received: 20 December 2010 - Accepted: 18 February 2011 To cite this article: Boydak, M., Ertas, A., Caliskan, S., 2011. Eskisehir – Catacik yoresi saricamlarinda ( Pinus sylvestris L.)  tohum verimi. Journal of the Faculty of Forestry Istanbul University 61(2): 17-38.