台南縣急水溪海茄苳林分枯落物量及養分之動態變化

Litterfall and Nutrient Dynamics of a Mangrove Avicennia marina (Forsk.) Vierh. Forest at the Chishui River, Tainan County, Taiwan

范貴珠(Kuei-Chu Fan)

《台灣林業科學》 22卷4期 (2007/12) Pp. 441-454

https://doi.org/10.7075/TJFS.200712.0441

摘要

Litterfall and nutrient dynamics were studied at a monospecific mangrove stand Avicennia marina located at the mouth of the Chishui River in Tainan County, southwestern Taiwan. Litterfall was collected once a month for 24 mo (from October 2002 to September 2004), along 6 transects (4 on the north bank and 2 on the south bank). Over the 2-yr period, annual litterfall production levels were 11.78 and 12.55 Mg ha^(-1) yr^(-1), leaf litter accounted for 68.3 and 61.8% of total litterfall, 13.0 and 13.6% were branch litter, 14.1 and 14.6% were reproductive organ litter, and 4.7 and 10.1% were miscellaneous parts, respectively. Litterfall varied in different months, and higher litterfall occurred in August to November. According to a correlation analysis between litterfall and environmental factors, leaf litter was independent of wind speed, rainfall, air temperature, and water temperature, however it was negatively correlated with chloride concentration and water conductivity. Branch, reproductive organ, and total litterfall production levels were positively correlated with wind speed, rainfall, air temperature, and water temperature, however they had negative correlations with chloride concentration and water conductivity. During October 2002 to September 2003, nutrient concentrations of the littefall were in order of C＞Na＞N＞Ca＞K＞Mg＞P, and the seasonal concentrations of nutrients were high during August to December. In addition, the annual nutrient flux amounts of C, N, P, K, Na, Ca, and Mg were 5353.04, 169.01, 15.40, 65.17, 347.36, 89.62, and 63.91 kg^(-1) ha^(-1) from litterfall, respectively, in the order of leaves＞reproductive organs＞branches＞miscellaneous parts. The results indicated that leaf litterfall was the major nutrient source in this mangrove ecosystem.

關鍵字

紅樹林 ； 海茄苳 ； 枯落物 ； 養分動態 ； 年回歸量

並列摘要

Litterfall and nutrient dynamics were studied at a monospecific mangrove stand Avicennia marina located at the mouth of the Chishui River in Tainan County, southwestern Taiwan. Litterfall was collected once a month for 24 mo (from October 2002 to September 2004), along 6 transects (4 on the north bank and 2 on the south bank). Over the 2-yr period, annual litterfall production levels were 11.78 and 12.55 Mg ha^(-1) yr^(-1), leaf litter accounted for 68.3 and 61.8% of total litterfall, 13.0 and 13.6% were branch litter, 14.1 and 14.6% were reproductive organ litter, and 4.7 and 10.1% were miscellaneous parts, respectively. Litterfall varied in different months, and higher litterfall occurred in August to November. According to a correlation analysis between litterfall and environmental factors, leaf litter was independent of wind speed, rainfall, air temperature, and water temperature, however it was negatively correlated with chloride concentration and water conductivity. Branch, reproductive organ, and total litterfall production levels were positively correlated with wind speed, rainfall, air temperature, and water temperature, however they had negative correlations with chloride concentration and water conductivity. During October 2002 to September 2003, nutrient concentrations of the littefall were in order of C＞Na＞N＞Ca＞K＞Mg＞P, and the seasonal concentrations of nutrients were high during August to December. In addition, the annual nutrient flux amounts of C, N, P, K, Na, Ca, and Mg were 5353.04, 169.01, 15.40, 65.17, 347.36, 89.62, and 63.91 kg^(-1) ha^(-1) from litterfall, respectively, in the order of leaves＞reproductive organs＞branches＞miscellaneous parts. The results indicated that leaf litterfall was the major nutrient source in this mangrove ecosystem.

並列關鍵字

mangrove ； Avicennia marina ； litterfall ； nutrient dynamics ； annual nutrient flux amount