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Mass-density relationship changes along salinity gradient in Suaeda salsa L.

文献类型： 外文期刊

作者： Zhang, Hao 1 ; Wang, Genxuan 2 ; Zheng, Kefeng 1 ; Zhang, Weiping 2 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Digital Agr Res, Hangzhou 310021, Zhejiang, Peoples R China

2.Zhejiang Univ, Coll Life Sci, Inst Agr Ecol Res, Hangzhou 310058, Zhejiang, Peoples R China

关键词： photosynthesis;salinity gradient;metabolic theory;soil salinity stress;mass-density relationship

期刊名称：ACTA PHYSIOLOGIAE PLANTARUM （ 影响因子：2.354； 五年影响因子：2.711 ）

ISSN：

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收录情况： SCI

摘要： Whether and why the biomass-density (M-N) scaling relationship varies along environmental gradients were continuously debated in theoretical ecology. In this study, how soil salinity stress affects on the M-N scaling relationship was investigated by using Suaeda salsa L. in beach of Dongtai, Jiangsu Province, China. The results showed that the exponent of the scaling relationship (b) of low salinity level (-1.259) was smaller than that of middle salinity level (-1.025), which in turn was smaller than that high salinity level (-0.698). The plant height-crown radius (H-r) scaling exponents (a,) decreased with increasing salinity stress, while the canopy coverage-density (C-N) scaling exponents (beta) showed an inverse trend. The predict data (b) based on a, and beta by using the geometric model were statistically indistinguishable from their observed values for the three salinity levels. Moreover, two resources utilization parameters (l mean from root to leaf, a total area of leaves) of metabolic theory, photosynthetic rate, and water-use efficiency were more advantageous to Suaeda salsa L. of high stress than to those of low salinity. Therefore, it was implied that the changes of M-N relationship along salinity gradients may be resulted from their different geometric morphologies and resource utilization in response to salinity stress.

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