氮沉降对木荷马尾松林叶片元素计量比的影响  

Effects of nitrogen deposition on leaf elements and their stoichiometric ratios in Schima superba and Pinus massoniana mixed forest

作　　者：邓浩俊 张丽娜[1] 张广帅[1] 林勇明[1] 吴承祯[1,2] 洪伟[1] 

机构地区：[1]福建农林大学林学院,福建福州350002 [2]武夷学院生态与资源工程学院,福建武夷山354300

出　　处：《森林与环境学报》2015年第2期118-124,共7页Journal of Forest and Environment

基　　金：教育部博士点学科专项基金项目(20123515110011);福建省科技重大专项项目(2012NZ0001)

摘　　要：为研究氮沉降对不同林龄木荷—马尾松混交林养分的影响,在室外分别设置了N0(0 kg·hm-2·a-1)、N1(50 kg·hm-2·a-1)、N2(100 kg·hm-2·a-1)和N3(150 kg·hm-2·a-1)4个处理的浓度,进行1 a的氮沉降模拟试验。结果表明,N1、N2和N3处理在试验后期均使30、50年生林木叶片中碳、氮、磷含量较试验前期有所增加,40年生林木叶片碳、氮含量增长明显,而磷含量在N2、N3处理较试验前期有所下降。30、50年生林木叶片氮磷比值主要在14-16之间,说明30、50年生林木同时受到氮、磷的限制,而40年生林木叶片氮磷比值均大于16,说明40年生林木主要受到磷的限制,但不同林龄叶片碳氮比值在试验后期均低于试验前期,下降明显。因此,氮沉降对不同林龄木荷—马尾松混交林叶片的碳、氮、磷含量及其计量比有着不同的影响。In order to investigate the effects of nitrogen deposition on nutrients in the different ages of Schima superba and Pinus massoniana mixed forest, 4 outdoor treatments which included N0（0 kg.hm-2·a-1 ）, N1 （50 kg·hm-2·a-1）, N2（ 100 kg·hm-2·a-1） and N3（ 150 kg·hm 2·a -1 ） of nitrogen deposition simulation were conducted for 1 year. The results showed that, compared with the first stage of the experiment, carbon, nitrogen and phosphorus in the leaves of 30 and 50 years old trees increased in the N1, N2 and N3 treatments at the final stage of 1 year experiment. In the leaves of 40 years old trees, carbon and nitrogen increased in all treatments while phosphorus decreased in N2 and N3 treatments. In the leaves of 30 and 50 years old trees nitrogen-phosphorus ratio was between 14 and 16, which meant they were restricted by nitrogen and phosphorus simultaneously, whereas in the leaves of 40 years old trees, nitrogen-phosphorus ratio was more than 16, which meant they were restricted by phosphorus, but in all leaves, carbon-nitrogen ratio was less at final stage dramatically. Therefore, nitrogen deposition has different effects on the carbon, nitrogen and phosphorus and their stoichiometric ratios in the leaves of S. superba and P. massoniana mixed forest at different ages.

关 键 词：模拟氮沉降 木荷—马尾松 碳 氮 磷 化学计量特征 

分 类 号：S792.17[农业科学—林木遗传育种]