中文摘要：

土壤酸 phosphomonoesterase 活动(APA ) 在控制磷(P) 骑车并且反映 P 限制的当前的度起一个重要作用。因为他们的潜在的应用，到提高氮(N) 免职的土壤 APA 的回答是重要的。到模仿的 N 免职的土壤 APA 的回答的研究在副热带的中国的三个继任森林里被进行。三个森林包括马森松(Pinus massoniana ) 森林(MPF ) 先驱社区，一个具球果、阔叶的混合森林(MF ) 转变社区和季风常绿树阔叶的森林(MEBF ) 高潮社区。四个 N 处理为 MEBF 被设计：控制(没有增加的 N ) ， low-N (50 kg N ha1 year1 ) 和 high-N (150 kg N ha1 year1 ) ，和仅仅三 N 处理(即，控制， low-N， medium-N ) 为 MPF 和 MF 被建立。结果证明土壤 APA 在 MEBF 是最高的，由 MPF 和 MF 列在后面。在 MPF 和 MF 的土壤 APA 没被 low-N 处理影响，但是在 medium-N 压抑处理。然而，在 MEBF 的土壤 APA 展出了否定回答到高 N 增加，显示提高的 N 免职的环境将减少为成熟森林生态系统的 P 供应。到副热带的森林里的 N 增加的土壤 APA 和它的回答是仔细与森林里的继任阶段有关。

英文摘要：

Soil acid phosphomonoesterase activity （APA） plays a vital role in controlling phosphorus （P） cycling and reflecting the current degree of P limitation. Responses of soil APA to elevating nitrogen （N） deposition are important because of their potential applications in addressing the relationship between N and P in forest ecosystems. A study of responses of soil APA to simulated N deposition was conducted in three succession forests of subtropical China. The three forests include a Masson pine （Pinus massoniana） forest （MPF）-pioneer community, a coniferous and broad-leaved mixed forest （MF）--transition community and a monsoon evergreen broad- leaved forest （MEBF）-climax community. Four N treatments were designed for MEBF： control （without N added）, low-N （50 kg N ha^（-1） year^（-1））, and medium-N （100 kg N ha^（-1） year^（-1）） and high-N （150 kg N ha^（-1） year^（-1））, and only three N treatments （i.e., control, low-N, medium-N） were established for MPF and MF. Results showed that soil APA was highest in MEBF, followed by MPF and MF. Soil APAs in both MPF and MF were not influenced by low-N treatments but depressed in medium-N treatments. However, soil APA in MEBF exhibited negative responses to high N additions, indicating that the environment of enhanced N depositions would reduce P supply for the mature forest ecosystem. Soil APA and its responses to N additions in subtropical forests were closely related to the succession stages in the forests.