Study on the Fruiting and Promoting Measures of Pinus Sylvestris Plantations in Yulin Sandy Area
The pollination characteristics of Pinus sylvestris in Yulin sandy area and the effects of stand density and site con-ditions on its fruiting were studied.The effects of fertilization and pruning measures on promoting the fruiting of Pinus syl-vestris strong aged plantations were analyzed.The results indicated that the peak period of male cones and female cones was not synchronized,and pollination was insufficient which affected the yield and quality of Pinus sylvestris seeds.Appropriate stand density could effectively improve the fruiting rate,cone yield and seed yield of Pinus sylvestris.Under different site conditions,the fruiting rate,cones number per plant,seeds number per fruit,seed plumpness rate,thousand seed weight and seed germination rate of Pinus sylvestris plantations all showed a trend of leeward slope＞hilly area＞windward slope.Applying compound fertilizer of 0.30 kg/plant in mid-April and early June each year could increase the fruiting rate and the thousand seed weight of Pinus sylvestris by 13.77％and 13.65％.Compared with the control,pruning treatment could in-crease the fruiting rate,thousand seed weight and seed germination rate of Pinus sylvestris by 27.54％,15.02％and 7.88％respectively.
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