Fractionation and Bioavailability of Phosphorus and Its Relation to Chlorophyll-a at the Coastal Area of Semarang City

L. Maslukah, A. Wirasatriya, S. Widada, D. Ismunarti, M. Yusuf, U. Salma, M. Zainuri
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Abstract

Abstract We investigate the distribution of various fractions phosphorus (P) in sediments at the coastal area of Semarang City. Samples were collected from thirteen locations at the Banjir Kanal Barat, port and Banjir Kanal Timur. Sedimentary parameters such as sand, silt, clay, and organic carbon were analysed in order to find out their relation with various P fractions. The sediment types are predominantly sandy and silty with low clay content. Among all fractions (loosely bound/Ads-P), bound calcium/Ca-P), iron bound/Fe-P), and organic fraction/OP), Ca-P fractions constitute the largest portion (71.2 %) followed by iron-bound (17.0 %), organic fraction (10.4 %) and loosely bound (1.4 %). The bioavailable P fractions range from 20.2 % to 42.0 % of the total P (TP) content with average 28.8 %. Relatively high Ads-P content is observed in offshore locations with comparatively high mud percentage as compared with the near-shore locations. The order of abundance of the main forms of P in the Semarang coastal surface sediments is as follows: Ca-P > Fe-P > OP > Ads-P. The concentration of this fraction causes the abundance of chlorophyll-a from 9.09 to 21.09 mg/m3.
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三宝垄市沿海地区磷的分异和生物有效性及其与叶绿素-a的关系
摘要研究了三宝垄市沿海地区沉积物中不同组分磷的分布。样本是从班吉尔卡纳尔巴拉特、港口和班吉尔卡纳尔帖木儿的13个地点收集的。分析了泥沙、粉砂、粘土、有机碳等沉积参数与不同磷组分的关系。沉积物类型以砂质和粉质为主,粘土含量较低。在所有组分(松散结合/Ads-P)、结合钙/Ca-P、铁结合/Fe-P)和有机组分/OP)中,Ca-P组分所占比例最大(71.2%),其次是铁结合组分(17.0%)、有机组分(10.4%)和松散结合组分(1.4%)。生物有效磷组分占总磷含量的20.2% ~ 42.0%,平均为28.8%。与近岸地区相比,在泥浆含量较高的海上地区,Ads-P含量相对较高。三宝垄海岸表层沉积物中磷的主要形态丰度顺序为:Ca-P > Fe-P > OP > Ads-P。该组分的浓度使叶绿素-a丰度在9.09 ~ 21.09 mg/m3之间。
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