广州市十种森林生态系统的碳循环

为了探讨南亚热带森林生态系统碳循环的规律,在广泛收集资料和试验数据的基础上,对广州10种森林生态系统的碳循环进行研究.结果表明：10种森林生态系统的碳密度在108.35～151.85 t C·hm^-2,其中乔木层碳密度在10.85～48.86 t C·hm^-2,0～60 cm土壤层在87.74～99.01 t C·hm^-2,均低于全国平均水平；从大气流向植被层的碳流量为4.41～9.15 t C·hm^-2·a^-1,植被层流向土壤层的碳流量为0.74～2.06 t C·hm^-2·a^-1,土壤层流向大气层的碳流量为3.94～5.42 t C·hm^-2·a^-1，即系统从大气净吸收碳在0.47～4.97 t C·hm^-2·a^-1之间.各种林分的净系统生产力不同，阔叶林大于针叶林，混交林大于纯林， 天然次生林大于人工林.

Carbon cycle in ten kinds of forest ecosystem in Guangzhou City

Based on an extensive collection of information and experimental data, this paper studied the carbon cycle in ten kinds of forest ecosystem in Guangzhou, China, aimed to explore the carbon cycling patterns in southern subtropical forest ecosystems. For the test ecosystems, their carbon density ranged from 108.35 to 151.85 t C · hm~(-2), with 10. 85-48.86 t C · hm~( -2) in tree layer and 87. 74-99. 01 t C · hm~(-2) in soil layer (0-60 cm), being lower than the national average. There were 4. 41-9. 15 t C · hm~(-2) · a~(-1) flowed from atmosphere to vegetation stratum, 0. 74-2. 06 t C ·hm~(-2) · a~(-1) from vegetation stratum to soil, and 3.94-5.42 t C · hm~(-2) · a~(-1) from soil to atmos-phere, i. e. , the forest systems absorbed 0. 47-4. 97 t C · hm -2 · a~(-1) from atmosphere. The net ecosystem production (NEP) varied with forest stand, being higher for broadleaved forest than coniferous forest, mixed forest than pure forest, and natural secondary forest than artificial forest.