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| Seasonal dynamics and impact factors of soil soluble organic nitrogen in different subtropical fruit plantations |
| Received:February 02, 2016 |
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| KeyWord:subtropics;longan plantation;loquat plantation;soil soluble organic nitrogen;seasonal dynamics;impact factor |
| Author Name | Affiliation | E-mail | | ZHOU Bi-qing | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | CHEN Cheng-rong | School of Environment, Griffith University, Brisbane, QLD 4111, Australia | | | ZHANG Li-ming | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | YANG Wen-hao | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | MAO Yan-ling | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | XING Shi-he | College of Resource and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
University Key Lab of Soil Ecosystem Health and Regulation in Fujian, Fujian Agriculture and Forestry University, Fuzhou 350002, China | fafuxsh@126.com |
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| Abstract: |
| To discuss the seasonal dynamics and its impact factors of soil soluble organic nitrogen(SON) in different subtropical fruit plantations, the plots sampling at fixing time and position were set in two adjacent different fruit plantations(Dimocarpus Longan Lour. and Eriobotrya Japonica Lindl.) with the same topography, parent material, soil type and planting time in south subtropics of Fujian. The concentrations of soil SON and relative properties at different seasons and depths of both fruit plantations were analyzed by TOC-TN analyzer, Quickchen Automateic Ion Analyzer and Gas Chromatography and the main impact factors of soil SON dynamics in the fruit plantation were discussed by grey correlation analysis. The results showed that the mean contents of soil SON accounted for 68.8% and 71.1% of total soluble nitrogen(TSN) in upper(0~20 cm) and lower(20~40 cm) layers of Dimocarpus Longan Lour. plantation, and 63.7% and 70.2% of TSN in upper(0~20 cm) and lower(20~40 cm) layers of Eriobotrya Japonica Lindl. plantation, respectively, and the SON contents in Dimocarpus Longan Lour. plantation at different seasons and depths were significantly higher than those in Eriobotrya Japonica Lindl. plantation,which indicated that SON was main component of soil soluble nitrogen in the fruit plantations and was significantly different between various types of fruit plantation in subtropics. Soil SON contents in Summer and Winter were significantly higher than those in Spring and Autumn in both fruit plantations, while the SON contents in upper and lower layers of Dimocarpus Longan Lour. plantation were highest in Winter, and those in both layers of Eriobotrya Japonica Lindl. plantation were highest in Summer. The grey correlation coefficients between SON content and possible impact factor in the fruit plantations showed following order:organic matter content, bacteria and fungi biomass > protease activity,soil temperature and pH > Asparaginase activity and soil moisture. The results indicated that the seasonal dynamics of soil SON in the subtropical fruit plantations were mainly affected not only by the differences of organic matter content, bacteria and fungi biomass, but also by the differences of protease activity, soil temperature and pH in different seasons. |
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