【作者】 黄亮； 吴莹； 张经； 李伟； 周菊珍；

【Author】 HUANG Liang, WU Ying, ZHANG Jing,LI Wei, Zhou Ju Zhen (State Key Laboratory of Estuarine and Coastal Research, East China Nomal University, Shanghai 200062,China; College of Chemistry and Chemical Engineering, Ocean university of Qingdao, Shandong, Qingdao, 266003; Plant Insitute of Wuhan, Chinese Acedemy of sciences, Hubei, Wuhan, 430074 )

【机构】 华东师范大学河口海岸国家重点实验室； 中国科学院武汉植物研究所；

【摘要】 本文就长江中游9个湖泊10种水生植物的C、N、P和稳定碳同位素进行了测定,水生植物C元素的平均含量为33.2±5.46%,N、P分别为1.58±0.90%和0.30±0.13%,δ^<sup>13C组成变化在-27.91～17.16‰之间。从水生植物的生长区域来看,叶子中的C、N和δ¹³C值与其所处的水环境有密切的关系。对于沉水植物,由于受到无机碳的限制,其叶子中C和N含量显著低于挺水植物及浮水植物;而同时由于水体中无机碳δ⁶（13）C组成较高,使得沉水植物叶子的δ¹³C大于挺水植物和浮水植物。更多还原

【Abstract】 By analyzing three elements(C, N, P, 13C) in the ten aquatic plants of nine lakes in the middle of Yangtze River, the concentrations of C, N and δ13C in leaves of aquatic macrophytes depend on the environment where they live in. The concentration of C and N in leaves of submerged macrophytes is significantly lower than that of leaves of floating and emergent macrophytes because of limition of inorganic carbon; And at the same time, because δ13C of inorganic carbon in water is higher than that of CO2 in air, δ13C of leaves of submerged macrophytes is higher than that of leaves of floating and emergent macrophytes.更多还原