以合肥市常见的6种针叶树种为对象，就其针叶养分(包括氮、磷、钾、钠、钙、镁等)含量及其回流特点进行了分析。结果表明，不同树种叶养分利用效率及回流率存在一定差异。所测的养分中，磷的利用效率和回流率最高，分别是461~4 495 g/g和5%~64%；其他元素依次为钾(215~567 g/g和13%~64%)、氮(62~114 g/g和10%~40%)、钠(364~424 g/g和7%~24%)、镁(214~316 g/g和-57%~12%)；钙的利用效率较低(43~73 g/g)，并在落叶中富集。不同树种中磷和钙的利用效率之间存在极显著正相关，氮和钠之间存在显著正相关；而各养分利用效率与立地土壤中的养分不存在显著相关性。
Abstract
Nutrient (including N, P, K, Na, Ca and Mg) concentrations and their retranslocation efficiencies in needles of some common coniferous tree species in urban Hefei were studied. The results from the study showed that there were notable differences in nutrient using efficiency and nutrient retranslocation amongst tree species. Among the nutrient measured elements, P appeared the greatest in using efficiency and retranslocation which were, respectively, 461—4 495 g/g and 5%—64% for different species, respectively. The other elements were ranked as follows, K 215—567 g/g and 13%—64%, N 62—114 g/g and 10%—40%, Na 364—424 g/g and 7%—24%, Mg 214—316 g/g and -57%—12%. Ca had the lowest use efficiency and was accumulated in the fallen needles. The regression analysis showed that there existed significant correlations between N and Na using efficiencies (p=0.012) and between P and Ca using efficiencies (p=0.004) among species. However, the nutrient using efficiency was not significantly correlated with the corresponding soil nutrient.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1]Aerts R. Nitrogen partitioning between resorption and decomposition pathways: A tradeoff between nitrogen use efficiency and liter decomposability[J]. Oikos, 1997, 80: 603-606.
[2]Berendse F, Aerts R. Nitrogenuseefficiencys: A biologically meaningful definition[J]. Functional Ecol, 1987, 1: 293-296.
[3]Vitousek P M. Nutrient cycling and nutrient use efficiency[J]. Amer Nat, 1982, 119(4): 553-572.
[4]苏波,韩兴国,黄建辉,等. 植物的养分利用效率及植物对养分胁迫环境的适应策略[J]. 生态学报,2000,20(2):335-343.
[5]刘增文,强虹. 森林生态系统养分循环研究中若干问题的讨论[J]. 南京林业大学学报:自然科学版,2002,26(4):27-30.
[6]De Kimpe C R, Morel J L. Urban soil management: A growing concern[J]. Soil Science, 2000, 165: 31-40.
[7]Manta D S, Angelone M, Bellanca A, et al. Heavy metals in urban soils: a case study from the city of Palermo, Italy[J]. The Science of Total Environment, 2002, 300: 229-243.
[8]李祥光,孙芳芳,吴敏,等. 广州城郊环境梯度下马尾松针叶元素质量分数变化特征[J]. 2007,16(6):1602-1607.
[9]Xu X N, Enoki T, Hirata E, et al. Pattern and chemical composition of fine litterfall in a subtropical forest in northern Okinawa Island, Japan[J]. Basic Appl Ecol, 2003, 4(5): 229-237.
[10]孟昭虹,周嘉. 哈尔滨城市土壤理化性质研究[J]. 哈尔滨师范大学学报:自然科学报,2005,21(4):102-105.
[11]卢瑛,甘海华,史正军,等. 深圳城市绿地土壤肥力质量评价及管理对策[J]. 水土保持学报,2005,19(1):153-156.
[12]Melillo J M. Nitrogen cycling in deciduous forests[J]. Ecological Bulletin (Stockholm), 1981, 33: 405-426.
[13]Aerts R. Nutrient use efficiency in evergreen and deciduous species from heathlands[J]. Oecologia, 1990, 84: 391-397.
[14]邢雪荣,韩兴国,陈灵芝. 植物养分利用效率研究综述[J]. 应用生态学报,2000,11(5):785-790.
[15]张甘霖,龚子同. 城市土壤与环境保护[J]. 科学新闻周刊,2000,37:7.
[16]Gusewell S. N∶P ratios in terrestrial plants: variation and functional significance[J]. New Phytologist, 2004, 164: 243-266.
[17]吴鹏飞,马祥庆. 植物养分高效利用机制研究进展[J]. 生态学报,2009,29(1):427-437.
基金
收稿日期：2008-12-29修回日期：2009-05-20基金项目：国家自然科学基金资助项目(30771719)作者简介：邓文鑫(1983—)，硕士生。*徐小牛(通讯作者)，教授，研究方向为森林培育及生物地球化学。Email: xnxu61@yahoo.com.cn。引文格式：邓文鑫,张凯,黄青,等. 园林绿地常见针叶树叶养分利用及回流特点[J]. 南京林业大学学报:自然科学版,2009,33(6):87-90.
