氮沉降对杉木人工幼林土壤溶液可溶性有机物质浓度及光谱学特征的影响
发布时间：2019-01-02 12:10
【摘要】：为探究氮沉降对亚热带杉木人工幼林土壤溶液可溶性有机物质(DOM)浓度及光谱学特征的影响,采用负压法,对0~15和15~30 cm土层土壤溶液DOM进行了2年的动态监测及光谱学特征研究.结果表明:氮沉降显著减少了各土层土壤溶液可溶性有机碳(DOC)浓度,增加了芳香化指数(AI)及腐殖化指数(HIX),但对可溶性有机氮(DON)无显著影响.土壤溶液DOM浓度存在明显的季节变动,夏秋季显著高于春冬季.傅里叶红外光谱结果表明,森林土壤溶液DOM在6个区域的相似位置存在吸收峰,其中1145~1149 cm~(-1)的吸收峰最强.三维荧光光谱表明,DOM主要以类蛋白质物质(Ex/Em=230 nm/300 nm)和微生物降解产物(Ex/Em=275 nm/300 nm)为主,施氮使0~15 cm土层类蛋白质物质减少.氮沉降可能主要是通过降低土壤pH、抑制土壤碳矿化和刺激植物生长等途径显著抑制土壤溶液DOC浓度,而表层被抑制的DOC成分以类蛋白质物质和羧酸盐物质为主.氮沉降短期可能有利于土壤肥力的储存,但随着氮沉降量的积累,土壤中营养物质将难以得到有效利用.
[Abstract]:In order to investigate the effect of nitrogen deposition on the concentration and spectral characteristics of soluble organic matter in soil solution of Chinese fir plantation, the negative pressure method was used. The dynamic monitoring and spectral characteristics of DOM in soil solution of 0 ~ 15 and 15 ~ (30) cm soil layer for 2 years were studied. The results showed that nitrogen deposition significantly decreased the concentration of soluble organic carbon (DOC), increased aromatization index (AI) and humification index (HIX), but had no significant effect on soluble organic nitrogen (DON). The concentration of DOM in soil solution showed obvious seasonal variation, which was significantly higher in summer and autumn than in spring and winter. The results of Fourier transform infrared spectroscopy (FTIR) showed that the absorption peaks of DOM in forest soil solution were similar in 6 regions, and the absorption peak of 1145 ~ 1149 cm~ (-1) was the strongest. Three-dimensional fluorescence spectra showed that DOM was mainly composed of protein-like substances (Ex/Em=230 nm/300 nm) and microbial degradation products (Ex/Em=275 nm/300 nm), and nitrogen application reduced the protein-like substances in the soil layer of 0 ~ 15 cm. Nitrogen deposition probably inhibited the concentration of DOC in soil solution by reducing soil pH, inhibiting soil carbon mineralization and stimulating plant growth, while the DOC components in the surface layer were mainly protein-like substances and carboxylate compounds. Nitrogen deposition may be beneficial to the storage of soil fertility in the short term, but with the accumulation of nitrogen deposition, the nutrients in the soil will be difficult to be effectively utilized.
【作者单位】： 福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地;衡阳师范学院城市与旅游学院;
【基金】：国家自然科学基金重点项目(31130013)资助~~
【分类号】：S714.2
[Abstract]:In order to investigate the effect of nitrogen deposition on the concentration and spectral characteristics of soluble organic matter in soil solution of Chinese fir plantation, the negative pressure method was used. The dynamic monitoring and spectral characteristics of DOM in soil solution of 0 ~ 15 and 15 ~ (30) cm soil layer for 2 years were studied. The results showed that nitrogen deposition significantly decreased the concentration of soluble organic carbon (DOC), increased aromatization index (AI) and humification index (HIX), but had no significant effect on soluble organic nitrogen (DON). The concentration of DOM in soil solution showed obvious seasonal variation, which was significantly higher in summer and autumn than in spring and winter. The results of Fourier transform infrared spectroscopy (FTIR) showed that the absorption peaks of DOM in forest soil solution were similar in 6 regions, and the absorption peak of 1145 ~ 1149 cm~ (-1) was the strongest. Three-dimensional fluorescence spectra showed that DOM was mainly composed of protein-like substances (Ex/Em=230 nm/300 nm) and microbial degradation products (Ex/Em=275 nm/300 nm), and nitrogen application reduced the protein-like substances in the soil layer of 0 ~ 15 cm. Nitrogen deposition probably inhibited the concentration of DOC in soil solution by reducing soil pH, inhibiting soil carbon mineralization and stimulating plant growth, while the DOC components in the surface layer were mainly protein-like substances and carboxylate compounds. Nitrogen deposition may be beneficial to the storage of soil fertility in the short term, but with the accumulation of nitrogen deposition, the nutrients in the soil will be difficult to be effectively utilized.
【作者单位】： 福建师范大学地理科学学院;湿润亚热带山地生态国家重点实验室培育基地;衡阳师范学院城市与旅游学院;
【基金】：国家自然科学基金重点项目(31130013)资助~~
【分类号】：S714.2
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