สืบค้นงานวิจัย
Biogeochemical cycle of sulfur in mangrove sediments and its potential change due to sea level rise resulting from climate change scenarios
Thoucha Rummasak - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Biogeochemical cycle of sulfur in mangrove sediments and its potential change due to sea level rise resulting from climate change scenarios
ผู้แต่ง / หัวหน้าโครงการ (EN): Thoucha Rummasak
บทคัดย่อ (EN): The sedimentary forms of sulfur and the relationships of CNS in naturalmangrove ecosystems were studied. Plants and the sediments at the outer and the innerparts of the Klong Ngao estuary (9.50' N, 98.35' E) were sampled during the August2000 wet season. Carbon and nitrogen concentrations in plant samples were relativelyhigh, whereas high sulfur contents were detected in the sediments. The in situ pH ofthe sediments was neutral and the sediment metabolism was anaerobic. The low C/Nratio, low carbon and high nitrogen contents were detected in the sediments at theouter estuary, whereas the higher concentrations of pyritic and organic sulfur werefound in the sediments at the inner part of the Klong Ngao. Pyrite was found to be thedominant form of the sedimentary sulfur and the amount of sulfur deposited in thesediments at the inner estuary was higher than at the outer estuary. Dissolved iron andsoluble sulfate, as well as an acid solution were obviously found in the sediment watersolution obtained from simple air-dried sediments at the inner part of the Klong Ngao.In contrast, the sediment pH at the outer estuary remained neutral, apparentlyassociated with the presence of soluble bicarbonate ions, and accordingly, dissolvediron was not found in the solution.In addition, seasonal variations and potential changes of water, salt and sulfurfluxes in the Klong Ngao estuary were investigated. Freshwater runoff, freshwatersulfate concentrations, estuary water salinity and sulfate concentrations weremonitored in the August 2000 (wet season), the November 2000 (wet to dry transitionperiod), the February 2001 (dry season), and the May 2001 (dry to wet transitionperiod). The scenarios of increase in precipitation by 5, 10, and 20 % and rising levelof seawater by 15,30, and 90 cm were studied to investigate the effect of precipitationand level of seawater on sourcelsink of sulfur. The residual outflow of water occurredin the wet season and the transition period while the residual inflow of seawater to themiddle part of the estuary happened in the dry season. The strong mixing of waterduring the high input of freshwater runoff affected the total water exchange time at theinner estuary more than at the outer estuary. Sulfate sinks mainly came from mixingseawater sulfate influxes. The inner and the outer parts of the Klong Ngao were a sinkfor seawater sulfate in May and August. But, in November and February, the innerestuary was a sink for sulfate, while the outer estuary acted as a source.The amount of precipitation and the estuary water level were projected toaffect the freshwater residence time and influence the estuary salinity gradient thatcaused changes in the total water exchange time, water exchange flow and mixingfluxes of salt and seawater sulfate. For the scenarios of rising level of seawater by 90cm, salinity increase approximately 1 ppt in the February dry season, andapproximately 1 - 2 ppt in the May transition period were anticipated. Whereas, inboth the February dry season and the May dry to wet transition period, the estuarywater sulfate concentrations were projected to be increasing close to 1 - 2 g 1.'. Theamount of the freshwater was projected to affect the movement of salt more than therising level of the estuary water, but the rising level of the estuary waters wasprojected to influence seawater sulfate sinks more than the increasing in the amount offreshwater runoff and precipitation. Further, seawater sulfate exposures were expectedwith either an alteration in precipitation or rising level of seawater. The sea level riseof 90 cm in association with a precipitation increase of 20% was projected to have thehighest impact on the estuary dynamics and caused the highest seawater sulfate sink atthe inner part of the Klong Ngao estuary.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): http://dcms.thailis.or.th/dcms/dccheck.php?Int_code=54&RecId=7947&obj_id=22622
เผยแพร่โดย (EN): มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
คำสำคัญ (EN): Mangrove swamp ecology
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

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Thoucha Rummasak. "Biogeochemical cycle of sulfur in mangrove sediments and its potential change due to sea level rise resulting from climate change scenarios". ไม่ระบุหน่วยงาน. ม.ป.ป.

Thoucha Rummasak. "Biogeochemical cycle of sulfur in mangrove sediments and its potential change due to sea level rise resulting from climate change scenarios". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Biogeochemical cycle of sulfur in mangrove sediments and its potential change due to sea level rise resulting from climate change scenarios
Thoucha Rummasak
มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี
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