<正>以琅琊山天然次生林中琅琊榆、醉翁榆、青檀、榉树、扑树等树种为试验材料，研究皖东石灰岩山地榆科树种生理生态特性，结果表明榆科树种抗旱、耐瘠、喜钙，是石灰岩山地适宜造林树种。具体表现在：（１）榆科树种光补偿点高，５种榆科树种光补偿点分别为６．３５，４．４５，５．０３，３．３２，５．５３Ｗ／ｍ２；（２）水分利用效率高，分别为３．１６×１０－２，２．９２×１０－２，２．６５×１０－２，２．４８×１０－２，２．９８×１０－２ｇ／ｇ（ＤＭ／Ｈ２Ｏ）；（３）水势值偏低，５月份中午叶片水势为－８．４，－７．２，－９．１，－８．０，－９．０Ｐａ。

This paper studied physiological and ecological characters of Ulmus chenmoui, U. gaussenii, Pteroceltis tatarinowii, Zelkova schneiderina and Celtis sinensis. Light compensations of them are 6.35,4.45,5.03,3,32 and 5.53W/m2 respectively. The water utilization efficiencies are 3.1610-2,2.9210-2,2.6510-2,2.4810-2 and 2.9810-2g/g(DW/H2O) and the water potentials at noon of May are -8.4,-7.2,-9.1,-8.0 dan -9.0 bar respectively. With high light compensation and water utilization efficiencies and low water potentials, they are adaptable to limestone babitat.