摘要
报道了我国海南岛目前保存面积较大、林分的组成和结构复杂的热带山地雨林生态系统的C素库和群落的CO2排放动态。通过在尖峰岭林区进行为期3a的研究,结果表明:热带山地雨林的碳素库主要有3个方面,即森林生物量中的C为234.3056t/hm2,森林凋落物现存量中的C为2.98t/hm2以及土壤层中的C为104.696t/hm2,合计为341.9816t/hm2。森林生态系统中的CO2平衡的基本动态为:每年用于群落总第一性生产力所同化的CO2总量为74.28t/hm2,其中42.69t/hm2的CO2又通过群落呼吸作用而释放出来,用于净第一性生产力为31.59t/hm2;另一方面,凋落物层每年通过呼吸而释放的CO2量为3.27t/hm2,土壤的释放(不包括根系的呼吸)量约为26.96t/hm2。收支相抵,热带山地雨林生态系统每年对大气中的CO2的固定量为1.366t/hm2,折合C为0.3725t/hm2。由此可见,恢复、发展和保护热带林生态系统是解决大气中CO2浓度升高、温室效应等全球性的生态问题的重要途径之一。
Summarized the results of carbon pool and carbon dioxide dynamics of the pristine ecosystem of tropical mountain rain forest at Jianfegling,Hainan Island.The results indicate that:(1) the carbon pool of the forest ecosystem consisted of three main parts with a total amount 342t/hm^2 (converting into carbon dioxide up to 1254t/hm^2),of which the forest biomass pool occupied 234.31t/hm^2,litter fall pool 2.98t/hm^2 and forest soil pool 104.696t/hm^2; (2) the basic dynamics of carbon dioxide in the forest ecosystem lists as:the CO_2 amount assimilated for gross productivity by forest community was up to 74.28t/hm^2·a,of which the respiration consuming by the community was calculated about 42.69t/hm^2·a,and the net amount of assimilated CO_2 remained of 31.59t/hm^2·a On the other hand,the forest community released the CO_2 by respiration of litter fall layer and forest soil which the amount was 3.26 and 26.96t/hm^2·a respectively.So the CO_2 budget of forest ecosystem could be known,that was 1.366t/hm^2·a CO_2 or 0.3725 t/hm^2·a C to be fixed in forest ecosystem.It is obvious that recovering,developing and protecting the tropical forest is one of the most important steps to solve the globe ecological problems especially the consistent increas of CO_2.
出处
《生态学报》
CAS
CSCD
北大核心
1998年第4期371-378,共8页
Acta Ecologica Sinica
基金
林业部重点项目
国家"八五"攻关项目