The Fate of P Fertilizer in the Soil of the Fushan Mixed Hardwood Ecosystem-soil analysis before Fertilization

The P fertilizer in the soils of the Fushan mixed hardwood ecosystem was monitored before (Feb 1992) fertilization, and 5 months (July 1992), and 7 years after fertilization treatments of N, P, or complete fertilizer. The P fertilizer was initially located at the top 0-5 cm depth in the P and complete fertilizer treatment plots after fertilization. After 7 years, however, no difference was found for available P in all plots. Major P fraction in all treatments existed in the nonoccluded Fe- and Al-form, which in the long-term would be still released and be available for forest growth. Nonoccluded Fe- and Al-P was highly correlated to available P and the other soil properties related to soil organic matter in this ecosystem.

本研究对福山混交硬木生态系统土壤中的磷肥进行了监测，监测时点分别为施肥前（1992年2月）、施肥后5个月（1992年7月）以及施加氮、磷或全价肥料处理后的7年。施肥后，磷肥初始分布于磷单施处理与全价肥料处理样地的0~5 cm表层土壤中。然而7年后，所有样地的有效磷含量均未出现显著差异。所有施肥处理下的主要磷组分均以非闭蓄态铁结合态磷与铝结合态磷形式存在，该组分在长期尺度下仍可被释放，可供林木生长利用。本生态系统中，非闭蓄态铁结合态磷与铝结合态磷与有效磷及其他与土壤有机质相关的土壤性质均呈显著相关关系。