摘要
阐述了农林生态系统保护SOM和N、P、K含量等土壤肥力资源的生态服务功能,提出了功能核算方法。该功能的实现有两种途径:一是通过森林群落和农作物的地上部凋落物,以及地下部生物体残留进入土壤的自然途径;二是施用化肥和有机肥的人工途径。各种农林生态系统增加土壤肥力资源的过程相对固定,数量基本稳定,因此可以分"物流型生态服务"和"库存型生态服务"来分别核算这种生态服务功能,并要根据不同区域和生态类型来确定核算公式和具体参数。对2005年佛山市农林生态系统增加土壤肥力功能的核算结果是,当年增加土壤肥力的功能价值为0.832亿元,现存土壤肥力资源的功能价值为19.828亿元。
Advances in the soil fertility（including SOM and N,P,K） conservation functions of agro-forestry ecosystem and their assessment methods were summarized and key operational assessment principles proposed.The agro-forestry ecosystem function to conserve soil fertility in the two ways： i） natural soil fertility,including tree and crop residue,underground biome remaining in the soil,and ii） artificial chemical and organic fertilization of the soil.For assessment purposes,the functions were put into two categories — the flow-type eco-service（FE）,interpreted as enhancing soil fertility,and the storage-type eco-service（SE）,interpreted as sustaining soil fertility.The formulas and assessment parameters are inherently different for specific regions and sub-ecosystems.Using this approach,the soil fertility conservation function of Foshan agro-forestry ecosystem was assessed for year 2005,the FE value is estimated at 83.2 million yuan and SE value calculated at 1 982.8 million yuan.
出处
《中国生态农业学报》
CAS
CSCD
2008年第5期1225-1229,共5页
Chinese Journal of Eco-Agriculture
基金
佛山市科技发展专项资金项目(200602002)资助
关键词
农林生态系统
土壤肥力
生态服务功能
核算方法
Agro-forestry ecosystem,Soil fertility,Function of ecosystem service,Assessment method
