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首页> 外文期刊>Plant and Soil >Do Casuarina cunninghamiana seedlings dependent on symbiotic N2 fixation have higher phosphorus requirements than those supplied with adequate fertilizer nitrogen?
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Do Casuarina cunninghamiana seedlings dependent on symbiotic N2 fixation have higher phosphorus requirements than those supplied with adequate fertilizer nitrogen?

机译：依靠共生氮固定的木麻黄幼苗的磷需求量是否高于提供足够肥料氮的磷需求量？

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Casuarina cunninghamiana seedlings grown in a solution culture system were inoculated with Frankia or given 0, 100, 500 or 1000 鍹 N and 0.1-250 鍹 P. With 0 or 100 鍹 N, growth was relatively poor and there was no response to increasing P supply above 10 and 50 鍹, respectively. Inoculated seedlings and those given 500 or 1000 鍹 N had significantly greater shoot dry weights (except at 0.1 鍹 P), and they responded to increasing P supply up to between 50 and 100 鍹 P. At each level of P supply, the dry weights of seedlings in these 3 treatments were similar. Nitrogen concentrations in shoots of seedlings provided with fertilizer N decreased with increasing P supply up to 50 鍹 and then remained unchanged. In contrast, N concentrations in shoots of inoculated seedlings increased with increasing P supply to 25 鍹 P. At the 2 highest levels of P supply, N concentrations in shoots of inoculated plants were significantly higher than those in seedlings provided with fertilizer N. In all N treatments,P concentrations in shoots increased with increasing P supply; concentrations were similar in inoculated seedlings and those with the 2 highest levels of fertilizer N across all levels of P supply. Alleviation of P deficiency in inoculated seedlings increased nodule number, nodule dry weight, N2 fixation g-1 nodule dry weight (nodule efficiency), P concentration in nodules, proportion of total seedling biomass allocated to nodules and average nodule size. However, all these parameters reached their maximum values at levels of P supply at or below those required for maximum host plant growth (50 to 100 鍹 P). The results indicate that the P requirement for host plant growth per se is similar to or higher than that required for symbiotic N2 fixation processes.
机译：将在溶液培养系统中生长的木麻黄幼苗接种Frankia或给予0、100、500或1000鍹N和0.1-250鍹P。在0或100鍹N下，生长相对较差，对增加的P无反应分别供应10 and和50 above以上的水接种的幼苗和给予500或1000鍹N的幼苗的苗干重明显更大（0.1 at P除外），它们对磷的供应增加至50到100鍹P之间有反应。在磷的每个供应水平下，干重这3种处理方法中的幼苗数相似。施用氮肥的秧苗中氮素的含量随磷素供应的增加而降低，直至50鍹，然后保持不变。相比之下，接种苗的苗中N的含量随P供给增加至25鍹P而增加。在P供给最高的2个水平下，接种植物的苗中N的浓度显着高于提供N的苗。氮肥处理中，随着磷素供应的增加，芽中磷素的含量增加。在所有水平的磷供应水平下，接种的幼苗和肥料氮水平最高的两个都相似。减轻接种苗中磷的缺乏会增加根瘤数，根瘤干重，N2固定g-1根瘤干重（根瘤效率），根瘤中的磷浓度，分配给根瘤的幼苗生物量总量和平均根瘤大小。但是，所有这些参数都在磷供应水平达到或低于寄主植物最大生长量（50至100鍹P）时达到其最大值。结果表明，寄主植物生长所需的磷需求量与共生氮固定过程所需的磷需求量相似或更高。

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