Nitrogen and phosphorus limitations of microbial respiration in a tropical phosphorus-fixing acrisol (ultisol) compared with organic compost
Nitrogen and phosphorus limitations of microbial respiration in a tropical phosphorus-fixing acrisol (ultisol) compared with organic compost
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DOI：
10.1016/j.soilbio.2005.01.002
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发表时间：
2005-07-01
影响因子：
9.7
通讯作者：
Singh, S
中科院分区：
文献类型：
--
作者：
Ilstedt, U;Singh, S
我们研究了在固磷热带阿克桑土壤中添加葡萄糖(G)、葡萄糖+氮（G + N）或葡萄糖+磷（G + P）至深度80 cm后，微生物呼吸的养分限制随时间的变化，并与堆肥相比较。在丙烯醇中，与葡萄糖同时添加P时，初始呼吸增加速率高于不添加P时。无氮时，呼吸达到平台期的速度比过量添加氮时更快，且水平更低。单独使用葡萄糖时，呼吸动力学在任何给定时间都遵循G + N或G + P曲线的较低曲线。因此，在碳充足的情况下，氮限制了丙烯酸甲酯中微生物呼吸的最大水平，但初始呼吸速率受到磷的限制。不施氮时，堆肥的呼吸速率最低。综上所述，微生物呼吸与土壤的固磷特性、时间尺度和碳有效性有关。©2005 Elsevier Ltd.版权所有。
We studied the nutrient I imitations of microbial respiration over time after the addition of glucose (G), glucose + nitrogen (G + N) or glucose + phosphorus (G + P) to a phosphorus-fixing tropical acrisol down to a depth of 80 cm, compared with those from compost. In the acrisol, the initial rate of respiration increase was higher when P was added together with glucose than when P was excluded. Without N, respiration reached a plateau faster and at a lower level than when N was added in excess. With glucose alone, the respiration kinetics followed the lower of the curves with G + N or G + P at any given time. Thus, nitrogen limited the maximum level of microbial respiration in the acrisol if ample carbon was available, but the initial respiration rate was limited by phosphorus. In contrast, for compost respiration was always lowest when N was not added. In conclusion, microbial respiration depended on the P-fixing properties of the soil, the time scale and the carbon availability. © 2005 Elsevier Ltd. All rights reserved.