6 research outputs found

    EXA-2017-1S-FUNDAMENTOS DE TELECOMUNICACIONES-1-2Par.docx

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    <p>Different litters indicate the statistical differences (p < 0.05).</p

    High Colonization Possibility of Some Species of Weeds in <i>Suaeda salsa</i> Community: From an Ecological Stoichiometry Perspective

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    <div><p><i>Suaeda salsa</i> community is a vegetation type in saline-alkali areas. Weed invasion and colonization in <i>S</i>. <i>salsa</i> communities lead to fragmentationsof <i>S</i>. <i>salsa</i> communities. The colonization of invaded weeds in <i>S</i>. <i>salsa</i> communities is related to community succession of saline-alkali zones. The fragmented <i>S</i>. <i>salsa</i> community may be restored if the mechanism of invaded weed colonization in <i>S</i>. <i>salsa</i> communities is clearly elucidated. Thus, we studied the ecological stoichiometric characteristics of soils and plants in a salt marsh to explain the high colonization possibility of invaded weeds in <i>S</i>. <i>salsa</i> communities. In October 2014, soils and plants were collected from Dongfeng Salt Marsh, Jiaozhou Bay, Shandong Province, China. The ratio of Ex-N/Ex-P in soil was less than 13, which suggests a relative nitrogen limitation for the primary production in the zone. The minimum phosphorus content in plants was higher than 1 mg g<sup>-1</sup>, whereas the maximum nitrogen content in plants was less than 13 mg g<sup>-1</sup>. These results imply that phosphorus was abundant, whereas nitrogen was deficient in the area. The plants in the salt marsh may be limited by nitrogen. Given the relatively lower nitrogen contents in <i>Cyperus glomeratus</i>, <i>Echinochloa crusgalli</i>, and <i>Aster subulatus</i> than that in <i>S</i>. <i>salsa</i>, these three species exhibited higher competitiveness than S. salsa did when nitrogen was limited in primary production. These weed species may colonize highly in <i>S</i>. <i>salsa</i> communities. Moreover, nitrogen fertilization might be effective to maintain <i>S</i>. <i>salsa</i> community in Dongfeng Salt Marsh, whereas its effects on controlling weeds colonization in <i>S</i>. <i>salsa</i> communities need more studies to verify.</p></div
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