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Testing potassium limitation on soil microbial activity in a sub-tropical forest

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Because potassium (K) is a rock-derived essential element that can be depleted in highly-weathered tropical soils,K availability may limit some portion of soil microbial activity in tropical forest ecosystems.In this paper we tested if K limits microbial activity in the condition of sufficient labile C supply.An incubation experiment was performed using surface soil samples (0-10 cm depth) obtained from four permanent ecological research plots in a natural sub-tropical forest in southern China.Soil samples were taken in September 2016.Heterotrophic soil respiration rates and microbial biomass were measured after the addition of glucose (both D and L) with and without K (potassium chloride).We did not observe any effects of K addition on soil microbial respiration,suggesting that K does not limit the microbial activity in the condition of sufficient labile C supply.The lack of microbial response to added K can be attributed to the high mobility of K in forest ecosystems,which may have provided sufficient K to microbes in our soil samples (already provided at the beginning of the incubation).However,at the present stage,we cannot conclude that K is not a limiting factor of soil microbial activity in other tropical forest ecosystems because of the heterogeneity of tropical forest ecosystems and few observations.The hypothesis needs to be tested in larger numbers of tropical forests.

Nutrient limitationRock-derived nutrientsSoil biologyNutrient dynamicsPotassium addition

Taiki Mori、Senhao Wang、Zhuohang Wang、Cong Wang、Hui Mo、Jiangming Mo、Xiankai Lu

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Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems,and Guangdong Provincial Key Laboratory of Applied Botany,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,Guangdong,People's Republic of China

Graduate School of Agriculture,Kyoto University,Kitashirakawa Oiwake-cho,Sakyo-ku,Kyoto,Japan

Department of Forest Site Environment,Forestry and Forest Products Research Institute,Tsukuba,Ibaraki 305-8687,Japan

University of Chinese Academy of Sciences,Beijing 100049,People's Republic of China

Department of Biological Sciences,Stanford University,Stanford,CA 94305-5020,USA

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This study was financially supported by National Natural Science Foundation of ChinaThis study was financially supported by National Natural Science Foundation of ChinaGrant-in-Aid for JSPS Postdoctoral Fellowships for Research Abroadand the Youth Innovation Promotion Association,CAS

NO.417311764165011048428 601No.2015287

2019

林业研究(英文版)
东北林业大学,中国生态学学会

林业研究(英文版)

CSTPCDCSCDSCI
影响因子：0.365
ISSN：1007-662X
年,卷(期)：2019.30(6)
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