摘要
本文通过大量观测资料,分析了毛白杨林网人工生态系统的物质循环与能量流动过程,结果表明:该系统的生物量可达42.0334t/ha,生产力达24.3950t/ha,年枯落物量为0.5545t/ha,归还率为35.72％。氮、磷、钾、钙、镁、锰6种元素的平均循环率为15.28％,比单一农作物群落提高了9.53％;太阳能转化率为2.14％,比农作物群落提高了3.19％。
Depend on the data obtained from a lot of field experiments, the paper deals with the circulation of matter ials and energy in a farmland shelterbelt network ecosystem for Populus tomontosa Carr. The results show that the biomass of the system was 42.0334t/ha, productivity was 24.3950 t/ha, annual litterfall was 0.5545t/ha. Return rate was 35.72% and average circulation rate of 6 nutrient elements (N. P. K, Ca. Mg. Mn) was 15.28%, which was 9.53% more than that in crop system.The results also show that the energy transformer efficiency of PHAR in the system was 2.14%,which was 3.19% more than that in crop community.
出处
《林业科学》
EI
CAS
CSCD
北大核心
1991年第4期393-400,共8页
Scientia Silvae Sinicae
关键词
农田防护林
人工生态系统
物质循环
Farmland shelterbelt
Artificial ecosystem
Matter circulation
Energy flow
