Responses of Soil Acid Phosphomonoesterase Activity to Simulated Nitrogen Deposition in Three Forests of Subtropical China  

作　　者：HUANG Wen-Juan ZHANG De-Qiang LI Yue-Lin LU XianKai ZHANG Wei HUANG Juan D.OTIENO Z.H.XU LIU Ju-Xiu LIU Shi-Zhong CHU Guo-Wei 

机构地区：[1]Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650(China) [2]Graduate University of Chinese Academy of Sciences,Beijing 100049(China) [3]Department of Plant Ecology,University of Bayreuth,Bayreuth 95440(Germany) [4]Environmental Futures Centre&School of Biomoleeular and Physical Sciences,Griffith University,Nathan QLD 4111(Australia)

出　　处：《Pedosphere》2012年第5期698-706,共9页土壤圈（英文版）

基　　金：the "Strategic Priority Research Program" of the Chinese Academy of Sciences (No.XDA05050208);the National Natural Science Foundation of China (Nos.31070439 and 40730102);the Knowledge Innovation Program of the Chinese Academy of Sciences (Nos.KSCX2-EW-Q-8 and KSCX2-EW-J-28)

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.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.

关 键 词：Dinghushan Biosphere Reserve forest ecosystems forest succession phosphorus limitation subtropical region 

分 类 号：S435.622.3[农业科学—农业昆虫与害虫防治] X510.2[农业科学—植物保护]