Effects of reclamation on soil soluble organic nitrogen contents in wetlands of the Ili River Valley

doi:10.3969/j.issn.1000-2006.201611026

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 41 ›› Issue (03): 1-6.doi: 10.3969/j.issn.1000-2006.201611026

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Effects of reclamation on soil soluble organic nitrogen contents in wetlands of the Ili River Valley

LI Lanhai¹, LIU Xiang^1,2, ZHU Yongli^3*

1. State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Co-Innovation Center of the Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, China

Online:2017-06-18 Published:2017-06-18

Abstract

Abstract: 【Objective】 To investigate the effect of reclamation on soil soluble organic nitrogen(SON)contents in wetland of the Ili River Valley, which could provide basis for the exploitation, protection and nitrogen regulation of wetlands in this area. 【Method】 Soil samples of 0-100 cm were collected at different depths from a reed(Phragmites australis(Cav.)Trin. ex Steud.)wetland and a paddy field which converted from this wetland to study the effect of reclamation on profile distribution of soil SON content, and to analyze the relationships between soil SON and physicochemical properties/other nitrogen fractions. 【Result】 Soil SON contents of reed wetland and paddy field accounted for 58.9%-74.1% of soil total soluble nitrogen(TSN)contents in the 0-100 cm soil layers, indicating that SON was the main component of soil soluble nitrogen in the study area. Soil SON contents decreased by 16.7%-40.5% after reclamations and the decreases were significant in the ≥20-60 cm soil layers. These results indicated that the effect of reclamation on soil SON content was not limited to topsoil, possibly due to that the high soil water contents of wetland and paddy field promoted the mobility of soil SON. Soil organic carbon content and total nitrogen content decreased considerably after reclamation, and the contents before reclamation were 2.9-5.9 times and 2.0-6.0 times higher than those after reclamation, respectively. In general, the ratio of carbon to nitrogen, microbial biomass nitrogen, ammonium nitrogen and nitrate nitrogen showed little response to the reclamation, only the contents of microbial biomass nitrogen and nitrate nitrogen in the 0-20 cm soil layer was significantly(P<0.05)decreased by reclamation. The significant(P<0.01)correlations between soil SON and organic carbon/total nitrogen suggested that the decreas of soil organic matter content after reclamation was the main reason for the decreased soil SON contents. 【Conclusion】 Soil SON is the major part of soil soluble nitrogen in the Ili River Valley, but its content showed a decreasing tendency after reclaiming into paddy field.

CLC Number:

S154

LI Lanhai, LIU Xiang, ZHU Yongli. Effects of reclamation on soil soluble organic nitrogen contents in wetlands of the Ili River Valley[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2017, 41(03): 1-6.

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Effects of reclamation on soil soluble organic nitrogen contents in wetlands of the Ili River Valley

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