【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。更多还原

【Abstract】 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.更多还原