Macronutrient status of tall and short forms of Spartina alterniflora in a South Carolina salt marsh
Macronutrient status of tall and short forms of Spartina alterniflora in a South Carolina salt marsh
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南卡罗来纳州盐沼中高型和矮型互花米草的常量营养状况
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
D. Kaplan
中科院分区：
文献类型：
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作者：
W. Ornes;D. Kaplan
在美国南卡罗来纳州温亚湾北入海口，对互花米草(TS)和互花米草(SS)地上部(地上全部活生物量)和根(地下全部活生物量)组织中的常量营养元素浓度进行了月度测定。地上部N、P和S浓度的季节变化都发生在TS和SS中，而根中的常量营养元素浓度在整个季节中保持不变(没有给出季节性的根数据)。互花链霉菌两个变型之间的常量营养元素浓度也不同。TS地上部和根部N浓度(以NH：计)均大于SS。但SS地上部和根部的硫素含量高于TS。SS部位的间隙水的Fe和氧化还原电位低于TS部位。这些条件会导致更高的硫化物水平，这也会减少植物的产量。我们认为，当S在地上部超过0.5O/O的临界浓度，在根中超过1.0%的临界浓度时，生长就会下降。我们的数据支持这样的假设，即TS和SS之间营养状况的差异可能是两个群体之间身高和生物量差异的原因。
Macronutrient concentration in shoot (all aboveground live biomass] and root (all belowground live biomass) tissues of tall (TS) and short Spartina alterniflora (SS) were measured monthly in North Inlet Estuary, Winyah Bay, South Carolina, USA. Seasonal changes in shoot N. P, and S concentrations occurred both in TS and SS, while root macronutrient concentrations remained constant throughout the seasons (seasonal root data not presented). Macronutrient concentrations between the 2 forms of S. alterniflora also differed. Concentrations of N (as NH:) were greater in the shoots and roots of TS than in SS. Sulfur, however, was greater in SS shoots and roots than in TS. Interstitial waters at the SS site had lower Fe and redox potentials than the TS site. These conditions would result in higher sulfide levels which also decrease plant production. We suggest that decreased growth occurred when S was above the critical concentrations of 0.5 O/ O in shoots and 1.0 % in roots. Our data support the hypothesis that differences in the nutritional status between TS and SS may account for the height and biomass differences between the 2 populations.