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http://www.cibj.com/应用与环境生物学报 Chin J Appl Environ Biol 2016，22 ( 3 ) : 0473-04792016-06-25 DOI: 10.3724/SP.J.1145.2015.08017收稿日期 Received: 2015-08-28 接受日期 Accepted: 2015-11-27*福建省科技重大专项（2012NZ0001）资助 Supported by the Major Science and Technology Program of Fujian Province (2012NZ0001)**共同通讯作者 Corresponding authors (hmilycau@163.com; fjwcz@126.com)氮硫复合沉降对杉木幼苗营养元素的影响 *颜晓艺 1, 2, 3 张艳荷 1, 3 林凤莲 1, 3 吴承祯 3, 4** 洪 伟 1, 3 李 键 1, 3**1 福建农林大学林学院 福州 3500022 福建农林大学生命科学学院 福州 3500023 福建省森林生态系统经营与过程重点实验室 福州 3500024 武夷学院生态与资源工程学院 南平 354300摘 要 采用随机区组设计模拟氮硫复合沉降实验，以CO(NH 2 ) 2 为氮源、Na 2 SO 4 为硫源，模拟试验1年后，分别采集不同氮硫沉降水平下杉木枝和叶的样品，研究杉木幼苗在不同沉降水平影响下的生长以及枝和叶营养元素氮、磷、钾、钙和镁含量的变化及其相关性. 结果表明：经过1年不同沉降水平处理后，幼苗胸径和地径在不同处理间差异显著（P < 0.05），均为促进作用，与对照相比，中氮低硫水平促进效果较佳；枝和叶中氮、磷和钾含量在不同处理间差异显著（P < 0.05），钙和镁在不同处理间差异不显著（P > 0.05）；氮沉降源与叶氮、枝氮、叶磷含量相关关系极显著，相关系数分别为0.86、0.81、-0.78，与叶钾、枝镁含量呈显著负相关，相关系数分别为-0.64、-0.63；硫沉降源与叶磷（r = -0.62）含量呈显著负相关. 叶中氮与磷、磷与钾 、枝中氮和镁含量相关关系极显著，相关系数分别为-0.79、0.84、-0.91，叶中磷和镁、钾和镁以及枝中氮和磷、钾与钙含量呈显著相关，相关系数分别为0.65、0.70、-0.66、0.72，其他相关关系不显著. 以上表明，中低氮硫沉降水平可有效提高杉木氮、磷、钾、钙、镁元素的含量. （图2 表3 参46）关键词 杉木；氮硫复合沉降；营养元素CLC Q945.78Effects of nitrogen and sulfur deposition on nutrient elements of Cunninghamia lanceolata (Lamb.) Hook seedlings under simulated experimental condition *YAN Xiaoyi 1, 2, 3 , ZHANG Yanhe 1, 3 , LIN Fenglian 1, 3 , WU Chengzhen 3, 4** , HONG Wei 1, 3 & LI Jian 1, 3**1 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China2 College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China3 Fujian Provincial Key Laboratory of Forest Ecosystem Processing and Management, Fujian Agriculture and Forestry University, Fuzhou 350002, China4 College of Ecology and Resource Engineering, Wuyi University, Nanping 354300, ChinaAbstract This study aimed to understand the nutritional elements mechanism of Cunninghamia lanceolata (Lamb.) Hook seedlings in response to simulated nitrogen (N) and sulfur (S) complex depositions. The effect of N and S deposition on main nutritional elements in the branches and leaves of C. lanceolata was investigated, including N, phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg), as well as their correlation. The randomized block design was used with Na 2 SO 4 as sulfur source and 46% CO(NH 2 ) 2 as N source. The results showed that the diameter at breast height and basal diameter increment of seedlings increased signif i cantly (P > 0.05) after simulated deposition treatments, most obviously in treatments of medium-N and low-S depositions. The contents of N, P, K in branches and leaves changed signif i cantly after treatments (P < 0.05), while Ca and Mg did not (P > 0.05). Correlation analysis indicated that N source was positively correlated to leaf N (R = 0.86) and branch N (R = 0.81), but negatively to leaf P (R = -0.78), leaf K (R = -0.64) and branch Mg (R = -0.63); S source was negatively correlated to leaf P (R = -0.62). There was signif i cant difference between N and P (R = -0.79), P and K (R = 0.84), P and Mg (R = 0.65), K and Mg (R = 0.70) in leaves, and N and Mg (R = -0.91), N and P (R = -0.66), K and Ca (R = 0.72) in branches. No signif i cant difference was found between others. The results suggested that the deposition of medium and low-N and S can effectively promote the accumulation of nutritional elements in C. lanceolata seedlings. Keywords Cunninghamia lanceolata (Lamb.) Hook; nitrogen and sulfur depositions; nutritional elements大气酸沉降（pH < 5.6）是由于人类活动排放的大量酸性物质（主要是NO x 和SO x ）在大气中被氧化成不易挥发的硝酸和硫酸等化学物质，溶于雨水通过重力作用降落到地面的过程或现象 [1] . 酸沉降是全球性的环境问题，由于现代亚洲地区农业氮肥广泛使用、工业化石燃料燃烧等人类活动 [2] ，大气酸沉降的频度、广度和强度成加剧态势 [3-4] . 酸沉降主要是氮沉降（Nitrogen，N）和硫沉降（Sulfur，S）. 过量的氮、硫输入造成陆地生态系统氮、硫饱和，并超过系统的