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期刊杂志

    上海地区落叶含氮量丰富的高效固氮树种选择

    关键词:园林植物;固氮树种;固氮效率;15N自然丰度法;叶片含氮量;上海

    Key words:landscape plants; N-fixing trees species; N fixation efficiency; 15N Natural Abundance Method; leaf N concentration; Shanghai

    摘要:对29种固氮树种的固氮效率与叶片含氮量进行测定,分析了两者的关系及叶片氮输出率的大小。以此为据,筛选具有较强固氮能力、落叶含氮量较高的树种。结果表明:大多数固氮能力强的树种鲜叶含氮量较高,两者的相关系数为0.888**,达到极显著水平;江南桤木、胡颓子、花叶胡颓子、常春油麻藤、紫藤、染料木、合欢、杨梅8种树种15N自然丰度值介于-0.632‰~1.313‰,落叶含氮量介于1.288%~1.628%,是筛选出的较好的落叶肥田植物。

    Abstract:In order to analyze the N exporting ratio of leaves, the relationship between N fixation efficiency and leaf N concentration of different N-fixing trees, N fixation efficiency and leaf N concentration of 29 N-fixing trees were screened in this experiment. The results showed that the trees with high-N-fixation efficiency usually had high-N-concentration in leaves, and there was significant correlation (correlative coefficient was 0.888**) between them. δ15N values of Alnus traboculosa, Elaeagnus pungens, Elaeagnus pungens 'Maculata', Mucuna sempervirens, Wisteria sinensis, Genista tinctoria, Albizia julibrissin and Myrica rubra were between -0.632‰ and 1.313‰, and the N concentration values of their leaf litter were between 1.288% and 1.628%. So they all had high capability of N fixation and were preferable plants for soil fertility enhancement.