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Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems

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ชื่อเรื่อง : Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems
นักวิจัย : Piwpuan N. , Jampeetong A. , Brix H.
คำค้น : -
หน่วยงาน : มหาวิทยาลัยเชียงใหม่
ผู้ร่วมงาน : -
ปีพิมพ์ : 2557
อ้างอิง : 10902414 , 10.1016/j.ecoenv.2014.05.032 , EESAD , http://www.scopus.com/inward/record.url?eid=2-s2.0-84904436777&partnerID=40&md5=4904c09e3b68df76c26cfc8c3847b843 , http://cmuir.cmu.ac.th/handle/6653943832/4905
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : -
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

Actinoscirpus grossus, a native species in tropical wetlands of South-East Asia, North Australia and the Pacific islands, has been reported to perform well in experimental scale constructed wetland (CW) systems. However, little is known about how high NH4+ concentrations prevailing in wastewater affect growth and performance of this species. We examined growth, morphological and physiological responses of A. grossus to NH4+ concentrations of 0.5, 2.5, 5, 10 and 15mM under hydroponic growth conditions. The relative growth rates (RGR) of the plants were highest at 2.5mM NH4+ but significantly reduced at 10 and 15mM NH4+. The roots of the plants were stunted and produced subepidermal lignified-cell layers at exposure to 10 and 15mM NH4+. The photosynthetic rates did not differ between treatments (average An=21.3±0.4μmolCO2m-2s-1) but the photosynthetic nitrogen and carbon use efficiency (PNUE and PCUE) were significantly depressed at 10 and 15mM NH4+ treatments. The concentration of NH4+ in the roots, but not in the leaves, reflected the NH4+ concentration in the growth medium suggesting that the species is unable to regulate the NH4+ uptake. The high root respiration rates in concert with high tissue NH4+ and declined C/N ratio at 10 and 15mM NH4+ suggest that the NH4+ assimilation occurs primarily in the roots and the plant has inadequate C-skeletons for NH4+ assimilation and exudation at high NH4+ concentration in the external solution. The concentrations of mineral cations were generally reduced and the root membrane permeability increased at high external NH4+ concentrations. Our study shows that A. grossus tolerates NH4+ concentrations up to 5mM which is characteristic of most types of wastewater. Hence, A. grossus is a good native candidate species for use in CW systems in tropical and subtropical climates in South-East Asia, North Australia and the Pacific islands. © 2014 Elsevier Inc.

บรรณานุกรม :
Piwpuan N. , Jampeetong A. , Brix H. . (2557). Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems.
    เชียงใหม่ : มหาวิทยาลัยเชียงใหม่ .
Piwpuan N. , Jampeetong A. , Brix H. . 2557. "Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems".
    เชียงใหม่ : มหาวิทยาลัยเชียงใหม่ .
Piwpuan N. , Jampeetong A. , Brix H. . "Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems."
    เชียงใหม่ : มหาวิทยาลัยเชียงใหม่ , 2557. Print.
Piwpuan N. , Jampeetong A. , Brix H. . Ammonium tolerance and toxicity of Actinoscirpus grossus - A candidate species for use in tropical constructed wetland systems. เชียงใหม่ : มหาวิทยาลัยเชียงใหม่ ; 2557.