奈曼沙区樟子松生长状况与水分关系

分析奈曼沙区樟子松的水分关系及生长状况,并与油松、小叶杨比较,结果表明樟子松较油松、小叶杨耐旱。但在无地下水或灌溉补给的迎风坡上部,樟子松片林立地水分状况严重恶化,15龄高生长速生期趋于结束,生长趋于衰退,而在地下水埋深2.4米左右的丘间低地高生长正值旺盛生长之际,这说明在年降水量仅366 mm的奈曼沙区,营造樟子松必须选择适宜的立地条件,才能保证人工林的正常生长和稳定性。

Growth Status of Pinus Sylvestris in Relation to Soil Moisure in Naiman Sandy Land

In this paper,the growth status of Pinus sylvestris var.mongolia in relation to soil moisture are studied and compared with Pinus tabulaeformis and Populus simonii in Naiman sandy land.The results shown that:Pinus sylvestris var.mongolia has higher bound water content,greater ratio of bound water content to free water content and stronger water-holding capacity compared with Pinus tabulaeform or Populus simonii,so drought resistance of Pinus tabulaeformis and Populus simonii,but the trunk water storage content of Pinus sylvestris var.mongolia in upper windward slope is 8% lower than that in interdune.This is the main cause for growth decline on upper windward slope.It is also proved that height growth of fifteen-year-old Pinus sylvestris var.mongolia on upper windward slope trends to decline,while that in interdune grows well.