施氮对荒漠化草原土壤理化性质及酶活性的影响

应用生态学报

施氮对荒漠化草原土壤理化性质及酶活性的影响

苏洁琼^1**,李新荣¹,鲍婧婷^1,2

(¹Shapotou Desert Experimental Research Station , Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; ^2University of Chinese Academy of Sciences, Beijing 100049, China)

出版日期:2014-03-18 发布日期:2014-03-18

Effects of nitrogen addition on soil physico-chemical properties and enzyme activities in desertified steppe.

(¹中国科学院寒区旱区环境与工程研究所沙坡头沙漠研究试验站, 兰州 730000; ²中国科学院大学, 北京 100049)

Online:2014-03-18 Published:2014-03-18

摘要/Abstract

摘要：

以腾格里沙漠东南缘的荒漠化草原为对象,设置添加0、1.75、3.5、7和14 g N·m^-2·a^-1 5个氮素水平,研究了施氮对该地区土壤理化性质和土壤酶活性的影响.结果表明: 施氮导致表层(0～10 cm)和下层(10～20 cm)土壤中总氮、NO₃^--N、NH₄⁺-N和有效氮的累积,土壤pH下降,对土壤有一定的酸化作用.施氮明显抑制了土壤酶活性,且不同酶活性在氮素投加水平、土层深度和年际间有所差异.土壤酶活性与土壤氮素水平、土壤pH及土壤水分之间存在显著相关关系.

Abstract: To investigate the impacts of nitrogen (N) enrichment on soil physico-chemical property and soil enzyme activities in desert ecosystems, a field experiment by adding N at 0, 1.75, 3.5, 7, or 14 g N·m^-2·a^-1 was conducted in a temperate desert steppe in the southeastern fringe of the Tengger Desert. The results showed that N addition led to accumulations of total N, NO₃^--N, NH₄⁺-N, and available N in the upper soil (0-10 cm) and subsoil (10-20 cm), however, reductions in soil pH were observed, causing soil acidification to some extent. N addition pronouncedly inhibited soil enzyme activities, which were different among N addition levels, soil depths, and years, respectively. Soil enzyme activities were significantly correlated with the soil N level, soil pH, and soil moisture content, respectively.

苏洁琼1**,李新荣1,鲍婧婷1,2. 施氮对荒漠化草原土壤理化性质及酶活性的影响[J]. 应用生态学报.