垦殖对伊犁河谷湿地土壤可溶性有机氮含量的影响

发布时间：2018-01-28 10:59

  本文关键词： 河流湿地 土壤可溶性有机氮(SON) 垦殖 伊犁河谷　出处：《南京林业大学学报(自然科学版)》2017年03期 　论文类型：期刊论文

【摘要】：【目的】研究垦殖对伊犁河谷湿地土壤可溶性有机氮(SON)的影响,为该区湿地的开发保护和氮素调控提供科学依据。【方法】以伊犁河谷的芦苇湿地及其垦殖而成的稻田为研究对象,分层采集0~100 cm的土壤样品,分析垦殖对垂直方向上土壤SON含量的影响,并探求SON与土壤理化性质和其他氮组分之间的关系。【结果】在0~100 cm土壤深度内,芦苇湿地和稻田土壤的SON含量占土壤可溶性总氮(TSN)含量的58.9%~74.1%,表明SON是该区域土壤可溶性氮素的主要组成部分;土壤SON含量在垦殖后降低了16.7%~40.5%,在≥20~60cm土层表现为显著降低,表明垦殖对土壤可溶性有机氮的影响不仅限于表层土壤,这缘于湿地和稻田土壤的高含水率使得土壤SON在垂直方向上的移动性较强;湿地土壤的有机碳和全氮在垦殖后大幅减少,其中垦殖前的含量分别是垦殖后的2.9~5.9倍和2.0~6.0倍。总体上讲,土壤碳氮比、微生物量氮、铵态氮和硝态氮在开垦前后的变化不大,只有0~20 cm土层的微生物量氮和硝态氮在垦殖后显著降低(P0.05);土壤SON与土壤有机碳和全氮表现出显著的相关性,说明垦殖后土壤有机质水平的降低是SON含量下降的主要原因。【结论】土壤SON是伊犁河谷湿地土壤可溶性氮素的主要形态,但其含量在湿地垦殖为稻田后表现出减少的趋势。
[Abstract]:[objective] to study the effect of reclamation on soil soluble organic nitrogen (SON) in Yili Valley wetland. [methods] the Reed wetland in Yili River Valley and its cultivated paddy field were taken as the research object, and the soil samples of 0 ~ 100 cm were collected by stratification. The effect of reclamation on soil SON content in vertical direction was analyzed, and the relationship between SON and soil physical and chemical properties and other nitrogen components was explored. [results] the soil depth was within 0 ~ 100cm. The SON content of Reed wetland and paddy soil accounted for 58.9% of the total soluble nitrogen (TN) content in the soil, indicating that SON is the main component of soil soluble nitrogen in this region. The content of SON in soil decreased by 16.7% and decreased significantly in soil layer 鈮，

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