Short-term effects of nitrogen addition and vegetation removal on soil chemical and biological properties in a freshwater marsh in Sanjiang Plain, Northeast China
Short-term effects of nitrogen addition and vegetation removal on soil chemical and biological properties in a freshwater marsh in Sanjiang Plain, Northeast China
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DOI：
10.1016/j.catena.2012.12.008
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发表时间：
2013-05
期刊：
影响因子：
6.2
通讯作者：
Yanyu Song;C. Song;Yingchen Li;Cui-cui Hou;Gui-sheng Yang;Xiaoyan Zhu
中科院分区：
文献类型：
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作者：
Yanyu Song;C. Song;Yingchen Li;Cui-cui Hou;Gui-sheng Yang;Xiaoyan Zhu
氮（N）是湿地生态系统中常见的有限营养元素。施氮可通过改变土壤化学和生物学特性来影响生态系统碳平衡，改变土壤碳储量。在本研究中，在中国东北的小叶章淡水沼泽地，研究了氮添加和植被去除后一个生长季对土壤性质的影响。具体而言，分析了土壤中的有效N（NH 4 +-N和NO3−-N）、微生物生物量C（MBC）和溶解有机C（DOC）浓度。此外，还研究了土壤酶（β-葡萄糖苷酶、转化酶和脲酶）的活性。结果表明，施氮显著增加了土壤表层和下层NH 4 +-N和NO3−-N的含量，植被的去除增强了这种效应。施氮和去除植被后，土壤MBC浓度增加，DOC浓度变化不显著。在土壤酶活性方面，施氮促进了表层土壤β-葡萄糖苷酶活性，促进了两层土壤转化酶和脲酶活性。植被去除增强了施氮对β-葡萄糖苷酶和转化酶活性的影响，但抑制了对脲酶活性的影响。说明施氮通过湿地植被间接影响土壤生化过程。
Nitrogen (N) is commonly a limited nutrient in wetland ecosystems. Nitrogen addition affects the ecosystem carbon (C) balance and alters soil C storage through soil chemical and biological changes. In the present study, the effects of N addition and vegetation removal after one growing season on soil properties were examined in a Calamagrostis angustifolia freshwater marsh in Northeast China. Specifically, available N (NH4+–N and NO3−–N), microbial biomass C (MBC), and dissolved organic C (DOC) concentrations in the soil were analyzed. In addition, activities of soil enzyme (β-glucosidase, invertase, and urease) were investigated. The results showed that N addition resulted in significant increase of NH4+–N and NO3−–N in both topsoil and subsoil, and vegetation removal enhanced these effects. Soil MBC concentrations increased after N addition and vegetation removal but DOC concentrations did not change significantly. As to soil enzyme activities, N addition stimulated the β-glucosidase activity in the topsoil and invertase and urease activities in both soil layers. Vegetation removal enhanced the effect of N addition on β-glucosidase and invertase activities but inhibited the effect on urease activity. These results suggested that N addition affects soil biochemical process indirectly through marshland vegetation.