Responses of Soil Acid Phosphomonoesterase Activity to Simulated Nitrogen Deposition in Three Forests of Subtropical China |
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| Authors: | HUANG Wen-Juan ZHANG De-Qiang LI Yue-Lin LU Xian-Kai ZHANG Wei HUANG Juan D.OTIENO Z. H. XU LIU Ju-Xiu LIU Shi-Zhong CHU Guo-Wei |
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| Affiliation: | Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Graduate University of Chinese Academy of Sciences, Beijing 100049, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Department of Plant Ecology, University of Bayreuth, Bayreuth 95440, Germany;Environmental Futures Centre&School of Biomolecular and Physical Sciences, Griffth University, Nathan QLD 4111, Australia;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China;Key laboratory of Vegetation Restoration and Management of Degrade Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China |
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| Abstract: | 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. |
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| Keywords: | Dinghushan Biosphere Reserve forest ecosystems forest succession phosphorus limitation subtropical region |
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