Using TDI to Assess Sedimentary Nutrient Status of the Mangrove forest Disturbed by Durian Typhoon at Can Gio Biosphere Reserver, Ho Chi Minh City

Received: 07-06-2013

Accepted: 25-08-2013

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Issue: Vol. 11 No. 5 (2013)

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TÀI NGUYÊN VÀ MÔI TRƯỜNG

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Hang, N., Tung, N., & Thuyen, L. (2024). Using TDI to Assess Sedimentary Nutrient Status of the Mangrove forest Disturbed by Durian Typhoon at Can Gio Biosphere Reserver, Ho Chi Minh City. Vietnam Journal of Agricultural Sciences, 11(5), 663–671. http://testtapchi.vnua.edu.vn/index.php/vjasvn/article/view/68

Using TDI to Assess Sedimentary Nutrient Status of the Mangrove forest Disturbed by Durian Typhoon at Can Gio Biosphere Reserver, Ho Chi Minh City

Nguyen Thi Gia Hang (*) 1 , Nguyen Thanh Tung 1 , Le Xuan Thuyen 1

  • 1 Khoa Sinh học, Trường Đại học Khoa Học Tự Nhiên, ĐHQG-HCM

    • Keywords

    Benthic diatom, indicator, Trophic Diatom Index, sensitivity value

    Abstract


    Trophic Diatom Index (TDI) first suggested by Kelly and Whitton in 1995 is an index assessing status of organic nutrients in aquatic ecosystems which bases on the total of diatom species and individuals that indicate the eutrophication. This study used TDI values to evaluate nutrient situation in the sediment at Can Gio Mangrove Biosphere Reserver after Durian typhoon (December 6, 2006). The study analyzed 72 soil samples and 108 diatom samples in the sediment for two seasons. Analysis of variance (ANOVA) showed that in the rainy season the mean TDI was significantly different between three sites: non-forest, mix and forest (F=10.88; P=0.0012). In contrast, in dry season, the mean TDI was not significantly different between three sites (F=0.45; P=0.65). We found species Achnanthidium minutissimum which is indicative of low total phosphorus and species Luticola goeppertiana, Navicula recens indicating high total phosphorus. However, we did not find correlation between the mean TDI and the total phosphorus and total nitrogen in the study. The studies on percent tolerant valves and orthophosphate concentration may help clearly explain about the relationship between the TDI and total phophorus and total nitrogen concentrations.

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