Soil water status influences plant nitrogen use: a case study

Soil water status influences plant nitrogen use: a case study
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土壤水分状况影响植物氮利用:案例研究

DOI:
10.1007/s11104-007-9450-y
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发表时间:
2007-11
期刊:
影响因子:
4.9
通讯作者:
李凌浩
李凌浩
中科院分区:
农林科学2区
文献类型:
--
作者:
袁志友;李凌浩

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研究了6个树种[小叶章Calamagrostis epigejos(L.)罗斯长穗苔草梅,芦苇(Phragmites communis L.)特琳,黄柳Chang,Salix cheilophila Schneid.,和香蒲minimaFunk.]生长在两种截然不同的生境类型中,即,高供水的河流湿地和低供水的河岸带。两个试验点的土壤水分供应存在差异,但氮素供应无明显差异。这里,NUE被定义为每单位吸收的氮的总净初级生产力。生长在河流湿地的不同物种(寸草苔、芦苇、芦苇)的氮素利用效率差异不显著。cheilophila,T. minima)和河岸生长的物种(寸草苔(Carex duriuscula)、拂子茅(Calamagrostis epigejos)、芦苇(P. communis)、S. gordejevii)。我们进一步分析了作为氮生产率(A,植物中每单位氮的干物质生产速率)和氮的平均停留时间(MRT,单位氮存在于植物中的时间段)的乘积的NUE。生长在河流湿地的物种比生长在河岸的物种具有更大的MRT,但MRT较低。A与MRT呈负相关。因此,NUE是相似的物种和栖息地。这些结果表明,环境因素,如土壤水分供应,可以影响植物的氮素利用。
We studied differences in nitrogen use efficiency (NUE) among six species [Calamagrostis epigejos(L.) Roth.,Carex duriusculaC.A. Mey.,Phragmites communis(L.) Trin.,Salix gordejeviiY.L. Chang,Salix cheilophilaSchneid., andTypha minimaFunk.] growing in two contrasting habitat types, i.e., a riverine wetland with high water supply and a riparian zone with low water supply. The two sites were different in soil water supply, but not in nitrogen supply. Here, NUE was defined as the total net primary production per unit nitrogen absorbed. There was no significant difference in NUE between the species growing in the riverine wetland (Carex duriuscula,P. communis,S. cheilophila,T. minima) and the species growing in the river bank (Carex duriuscula,Calamagrostis epigejos,P. communis,S. gordejevii). We further analyzed NUE as the product of the nitrogen productivity (A, the rate of dry matter production per unit of nitrogen in the plant) and the mean residence time of nitrogen (MRT, the period of time a unit of nitrogen is present in the plant). The species growing in the riverine wetland had largerAbut lower MRT than the species growing in the river bank. There was an inverse relationship betweenAand MRT. Consequently, NUE was similar among species and habitats. These results suggested that environmental factors, such as soil water supply, can influence N use by plants.
DOI: 10.1007/bf00043032
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影响因子: 4.9
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