Sains Malaysiana 48(11)(2019): 2405–2413

http://dx.doi.org/10.17576/jsm-2019-4811-11

 

Sumber Penyumbang Karbon ke dalam Sedimen Dataran Rumput Laut di Muara Sungai Pulai, Johor, Malaysia

(Source Contributors of Carbon to Sediments in the Seagrass Meadows of Sungai Pulai Estuary, Johor, Malaysia)

 

NUR HIDAYAH1, MOHAMMAD ROZAIMI1* & MOHD SHAHRUL MOHD NADZIR1,2

 

1Center for Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

2Centre for Tropical Climate Change System, Institute of Climate Change, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 25 Mac 2019/Diterima: 15 Ogos 2019

 

ABSTRAK

Terdapat banyak kajian karbon biru yang menggunakan kaedah penjejak isotop untuk mendapatkan maklumat mengenai sumbangan sumber bahan organik (OM) di dalam sedimen. Objektif kajian ini terbahagi kepada dua iaitu untuk mengetahui sumbangan sumber kepada takungan OM dan untuk membandingkan keberkesanan penggunaan dua jenis isotop stabil (δ13C dan δ15N) atau satu jenis isotop stabil (δ13C) dalam menentukan sumbangan OM di kawasan persampelan. Sampel rumput laut, makroalga, seston dan epifit di kawasan muara Sungai Pulai dianalisis dan diukur menggunakan jisim aliran nisbah isotop (IRMS). Analisis isotop stabil melalui R (SIAR) pula digunakan untuk menganggarkan sumbangan relatif keempat-empat sumber tersebut kepada takungan OM sedimen. Sampel seston mencatatkan nilai tertinggi (53 - 98%) dan rumput laut mencatatkan nilai terendah (7%) dalam sumbangan OM di dalam sedimen dataran rumput laut. Ini menunjukkan sumber luar (aloktonus) memainkan peranan yang penting kepada penambahan zarah terampai. Menggunakan dua penjejak isotop stabil, plot kepadatan menunjukkan sumbangan yang lebih kecil oleh seston (96.18 - 99.82%) berbanding menggunakan satu penjejak isotop stabil (89.15 - 99.75%). Terdapat perbezaan bererti (p<0.05) antara nilai julat peratus kebolehpercayaan (CI95%) penggunaan dua penjejak isotop stabil (δ13C dan δ15N) dan nilai julat peratus kebolehpercayaan (CI95%) penggunaan satu penjejak isotop stabil (δ13C). Hal ini menunjukkan nilai julat peratus kebolehpercayaan (CI95%) penggunaan dua penjejak isotop stabil lebih kecil iaitu bermaksud kebolehpercayaan adalah lebih tinggi melalui kaedah ini dalam pemodelan sumbangan sumber OM di kawasan kajian.

 

Kata kunci: Bahan organik; isotop stabil; model pencampuran Bayesian; SIAR

 

ABSTRACT

There are many blue carbon studies using isotopic tracer methods to obtain information on the source contribution of organic materials (OM) in the sediment. The objectives of this research were to identify the sources contributing to the sediment OM pool, and to compare the reliability of using dual stable isotopes (δ13C and δ15N) or single stable isotope (δ13C) in determining the source contributions of OM in the sampling area. Seagrass, macroalgae, seston and epiphyte samples in Sungai Pulai estuary were analyzed and measured using isotopic ratio mass spectrometry (IRMS). The relative contribution of the four sources to the OM pool sediment was estimated by using Stable Isotope Analysis in R (SIAR). Seston recorded the highest value (53 - 98%) and seagrass recorded the lowest value (7%) in OM contribution in the sediments of the seagrass meadow. This shows that external input (allochthonous) plays an important role in the addition of suspended particles. By using dual stable isotope tracer, density plots showed a smaller range of contribution by seston (96.18 - 99.82%) than using a single tracer (89.15 - 99.75%). There is a significant difference (p<0.05) between the value of the reliability percentage range (CI95%) using dual stable isotope tracer (δ13C and δ15N) than using a single tracer (δ13C). This showed that the value of the reliability range (CI95%) using dual stable isotope tracer is smaller and therefore the realibility is higher in the modelling of source contributions of OM in the study area.

 

Keywords: Bayesian mixing model; organic matter; SIAR; stable isotope

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*Pengarang untuk surat-menyurat; email: mdrozaimi@ukm.edu.my

 

 

 

 

 

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