摘要
杨树沙棘混交林的研究结果表明：沙棘有固氮肥地的作用，能促进生长。但是，在干旱的内蒙古中部地区，混交的沙棘应控制其根蘖苗的数量，使每株沙棘占有１．０－２．０ｍ２的营养面积为宜。如果密度过大，不仅与杨树争夺水分，其固氮作用也受到影响，将减弱对杨树生长的促进作用。
Researches on mixed forest of P.X xiaozhuangica W.Y.Hsu et Liang cv.’Popularis’ and Hippophae rhamnoides show that H.rhamnoides plays a role of nitrogen fixation which can fertilize the soil and lead to promotion of the forest growth.However,the amount of root shoots of mixed H.rhamnodes should be limited to an extent that each plant shares a space of 1.0-2.0m\+2 for nutrient needs.In the case of large H.rhamnoides density,they not only vie with poplar for water,but also reduce there ability of nitrogen fixation,and the promotion effect on poplar is decreased as well.\=\ \
关键词
群众杨
沙棘
混交林
固氮
密度
P.X xiaozhuangica W.Y.Hsu et Liang cv.’Popularis’
Hippophae rhamnoides
Mixed forest
Nitrogen fixation
Density
