Energy characteristics of Casuarina equisetifolia ecosystem on coastal sand in Dongshan County,Fujian Province

Abstract

Abstract: The study on the energy characteristics of Casurina equisetifolia community on red earth eolian sandy soil and homogeneous eolian sandy soil in Dongshan County of Fujian Province showed that the standing biomass and energy of Casurina equisetifolia community were 15 681.84 g·m^-2 and 317 795.31 kJ·m^-2 on red earth eolian sandy soil,and 5 129.87 g·m^-2 and 10 575.50 kJ·m^-2 on homogeneous eolian sandy soil,respectively.On homogeneous eolian sandy soil,the gross caloric value of the community ranged from 19.98 kJ·g^-1 to 21.39 kJ·g^-1,of which,dead branch was the highest while root was the lowest,and its percentage was 46.93%(truck)>16.44%(root)>13.92% (branch)> 12.28%(dead branch)>5.87%(bark)>3.90%(leaf)> 0.66%(fruit).The return amount of litter was 2 061.77 kJ·m^-2·yr^-1,and the net energy productivity was 12662.82 kJ·m^-2·yr^-1.On red earth eolian sandy soil,the gross caloric value was 19.84～21.70 kJ·g^-1,among which,leaf was the highest while root was the lowest,and its percentage was 38.09%(truck)>19.48%(branch)>17.09%(root)>16.86%(leaf)>6.83%(bark)>0.88%(dead branch)>0.77%(fruit).The returned amount of litter was 9 070.47 kJ·m^-2·yr^-1,and the net energy productivity was 31 298.70 kJ·m^-2·yr^-1.The standing biomass and energy of Casurina equisetifolia community were higher on red earth eolian sandy soil than on homogeneous eolian sandy soil, mainly because red earth eolian sandy soil had a thinner sandy layer(<20cm) and a stronger nutrient and water supplying ability.

Key words: Energy, Casurina equisetifolia, Homogeneous eolian sandy soil, Red earth eolian sandy soil

CLC Number:

S727

YE Gongfu, ZHANG Qinghai, LU Changyi, LIN Yiming, WU Xilin . Energy characteristics of Casuarina equisetifolia ecosystem on coastal sand in Dongshan County,Fujian Province[J]. Chinese Journal of Applied Ecology, 2005, 16(10): 1812-1816.

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