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1982年2—12月,在河南的山区和平原进行了泡桐林营养元素循环研究。在泡桐各器官中,花、叶营养元素含量最高,树干中含量最低。叶和枝是泡桐林木氮的贮库,叶中氮的贮存量占林木总贮量的42—53％。根是磷的贮库,贮磷量占总量的40—56％。钾主要贮存在枝和根内,钙主要贮存在树干中。泡桐林每年吸收的营养元素约320kg/ha左右,其中分配到新增加组织中89kg,枯落归还132kg,降雨淋洗和茎流100kg左右。在吸收的营养元素中,钙占量最多,每年104kg/ha;钾、氮较多,每年有70—100kg/ha;磷、镁较少,吸收量26—27kg/ha.a。
From February to December 1982, a study of nutrient element cycling in Paulownia trees was conducted in the mountainous and plains of Henan. In Paulownia organs, flowers, leaves the highest content of nutrients, the lowest content in the trunk. Leaves and branches are the reservoirs of Paulownia trees nitrogen, leaf nitrogen storage accounted for 42-53% of the total forest reserves. The root is a reservoir of phosphorus, phosphorus storage accounts for 40-56% of the total. Potassium is mainly stored in the branches and roots, calcium is mainly stored in the trunk. Paulownia annual nutrient absorption of about 320kg / ha, which assigned to the newly added 89kg, litter return 132kg, rainfall leaching and stem flow of about 100kg. In the absorption of nutrients, the largest share of calcium, annual 104kg / ha; potassium, nitrogen more, each 70-100kg / ha; phosphorus and magnesium less absorption 26-27kg / ha.a.