文献类型： 外文期刊

作者： Xing, S. H. ¹ ; Chen, C. R. ¹ ; Zhang, H. ⁴ ; Zhou, B. Q. ² ; Nang, Z. M. ⁴ ; Xu, Z. H. ¹ ;

作者机构： 1.Griffith Univ, Environm Futures Ctr, Griffith Sch Environm, Nathan, Qld 4111, Australia

2.Fujian Agr & Forestry Univ, Coll Resource & Environm, Fuzhou 350002, Peoples R China

3.Fujian Acad Agr Sci, Crop Inst, Fuzhou 350003, Peoples R China

4.Fujian Acad Agr Sci, Inst Soil & Fertilizer, Fuzhou 350003, Peoples R China

关键词： genotype.;Soil soluble organic nitrogen (SON);Camellia sinensis (L.) O. Kuntze;Slope position;Phospholipid fatty acid (PLFA);Protease;Internet resource.

期刊名称：BIOGEOCHEMISTRY （ 影响因子：4.825； 五年影响因子：4.691 ）

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收录情况： SCI

摘要： Soluble organic nitrogen (SON) plays a vital role in ecosystem N cycling processes and is controlled by a number of biotic and abiotic factors. We compared soil SON availability, microbial biomass, protease and asparaginase activities and phospholipids fatty acid (PLFA) profiles at the 0-15 and 15-30 cm layers in 10 year old tea plantations of two genotypes--Oolong tea (Camellia sinensis (L.) O. Kuntze cv. Huangjingui) (designated as OT') and Green tea (C. sinensis (L.) O. Kuntze cv. Fuyun 6) (designated as GT')--established at different slope positions. Concentrations of soil SON measured by the 2 M KCl extraction under the OT plantation were greater than under the GT plantation, while concentrations of soil SON were greater in the middle slope (MS) and lower slope (LS) positions than in the upper slope (US) position. Trends in soil microbial biomass C and N and protease and asparaginase activities between the two genotypes and across the slope positions were similar to the SON pools. The fungal-to-bacterial ratios were higher in the US position than in the MS and LS positions and higher under the GT plantation than under the OT plantation. Results from this study support that the genotype and the slope position are key factors controlling the availability of soil SON in tea plantations and also imply the importance of plant traits (e.g. litter quantity and chemistry) and soil texture in determining overall soil N availability and transformation processes and microbial community composition at the landscape level.