南京林业大学学报（自然科学版）2017，Vol.41Issue(3)：1-6,6.DOI:10.3969/j.issn.1000-2006.201611026
垦殖对伊犁河谷湿地土壤可溶性有机氮含量的影响
Effects of reclamation on soil soluble organic nitrogen contents in wetlands of the Ili River Valley
摘要
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.关键词
河流湿地/土壤可溶性有机氮(SON)/垦殖/伊犁河谷Key words
riverine wetlands/soil soluble organic nitrogen (SON)/reclamation/Ili River Valley分类
农业科技引用本文复制引用
李兰海,刘翔,朱咏莉..垦殖对伊犁河谷湿地土壤可溶性有机氮含量的影响[J].南京林业大学学报（自然科学版）,2017,41(3):1-6,6.基金项目
国家自然科学基金项目(41471191) （41471191）
江苏省“青蓝工程”资助项目(苏教师[2016] 15号) （苏教师[2016] 15号）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
