不同营养条件下杨槐混交对生长和杨树光合作用的影响

该文通过封闭循环系统沙培盆栽试验研究了一年生杨树、刺槐及两者混植在全营养、缺氮、缺钾和缺磷条件下的生长和杨树光合特性，结果表明：在栽植第一个生长季节，缺氮培养的刺槐根瘤固氮主要用于本身，后期才开始影响杨树，杨槐混交能消除缺钾对刺槐的胁迫。两树种在磷素吸收方面未发现明显相互作用。

Studies on Growth and Photosynthesis of Mixed Plantations of Poplar and Black Locust Growing Under Different Mineral Nutrient Regimes

Mixed plantations of poplar and black locust,growing in a closed mineral ele-ment cycling sand cuIture system,were used to study the growth and photosynthesis ofpoplar under different nutrient regimes. Nutrient regimes consisted of complete nutrition. N-deficient,P-deficient and K-deficient regimes. During the first season,nitrogen fixationby black locust mainly benefited black locust itself,and poplar was only affected by the endof the growing season. Mixed plantation with poplar eliminated K-deficient stress symptomsin black locust.No interaction was found between the two tree species in terms of phospho-rous uptake under P-deficient conditions.