Seasonal Changes of Soil Nitrogen Mineralization Along Restoration Gradient of Sandy Grassland, Northern China

IF 0.4 4区 环境科学与生态学 Q4 ECOLOGY
P. Lv, X. Zuo, Shanshan Sun, Jing Zhang, Shenglong Zhao, Ya Hu
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引用次数: 0

Abstract

ABSTRACT Soil nitrogen mineralization strongly affects N availability, thus impacting the primary productivity in ecosystems. The seasonal environmental changes affect soil mineralization in restored sandy grasslands such as a studied mobile dune (MD), a semi-fixed dune (SFD), a fixed dune (FD) and a grassland (G). During the growing season, we examined the association of soil N mineralization rate with vegetation characteristics, soil properties and climatic factors through the multivariate stepwise regression model. The vegetation cover, species diversity, above- and belowground biomass, soil carbon, nitrogen, soil water content (SWC), pH, electrical conductivity, very fine sand, clay and silt fractions increased during sandy grassland restoration. The NH4+-N concentration in MD and SFD was higher than that in FD and G, while NO3--N and inorganic N concentration showed a reverse trend. The NH4+N, NO3--N and inorganic N concentrations in MD, SFD and FD reached to the highest values in June, while in G they were highest in May. The net mineralization and nitrification rates increased with sandy grassland restoration; both of these rates were much greater in June than in other months at all sites. Regression analysis showed that the NO3--N concentration, SWC, pH of the soil and precipitation could explain 75% of the total variation in net nitrification rate, and the NO3--N concentration and precipitation could explain 59% of the total variation in the net mineralization rate. These results illustrate that the sandy grassland restoration can enhance the soil N availability, with soil N mineralization mainly determined by the changes of the NO3--N concentration and precipitation.
北方沙质草地恢复梯度土壤氮矿化的季节变化
摘要土壤氮矿化强烈影响氮的有效性,从而影响生态系统的初级生产力。季节性环境变化影响恢复沙质草原的土壤矿化,如研究的流动沙丘(MD)、半固定沙丘(SFD)、固定沙丘(FD)和草地(G)。在生长季节,我们通过多元逐步回归模型检验了土壤氮矿化率与植被特征、土壤性质和气候因素的关系。沙质草原恢复过程中,植被覆盖率、物种多样性、地上和地下生物量、土壤碳、氮、土壤含水量、pH值、电导率、极细砂、粘土和淤泥含量增加。MD和SFD的NH4+-N浓度高于FD和G,而NO3--N和无机氮浓度则呈相反趋势。MD、SFD和FD的NH4+N、NO3--N和无机氮浓度在6月达到最高值,而G的NH4+-N、NO3-N和无机氮含量在5月达到最高;这两个比率在6月份都远高于其他月份。回归分析表明,NO3-N浓度、土壤SWC、pH值和降水量可解释净硝化速率总变化的75%,NO3-氮浓度和降水量可以解释净矿化速率总变化59%。这些结果表明,沙质草地的恢复可以提高土壤氮的有效性,土壤氮矿化主要由NO3-N浓度和降水量的变化决定。
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来源期刊
Polish Journal of Ecology
Polish Journal of Ecology 环境科学-生态学
CiteScore
1.10
自引率
0.00%
发文量
9
审稿时长
18-36 weeks
期刊介绍: POLISH JOURNAL OF ECOLOGY (formerly Ekologia polska) publishes original scientific research papers dealing with all aspects of ecology: both fundamental and applied, physiological ecology, evolutionary ecology, ecology of population, community, ecosystem, landscape as well as global ecology. There is no bias regarding taxons, ecosystems or geographical regions.
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