【摘要】：為探究氮沉降對(duì)亞熱帶杉木人工幼林土壤溶液可溶性有機(jī)物質(zhì)(DOM)濃度及光譜學(xué)特征的影響,采用負(fù)壓法,對(duì)0~15和15~30 cm土層土壤溶液DOM進(jìn)行了2年的動(dòng)態(tài)監(jiān)測(cè)及光譜學(xué)特征研究.結(jié)果表明:氮沉降顯著減少了各土層土壤溶液可溶性有機(jī)碳(DOC)濃度,增加了芳香化指數(shù)(AI)及腐殖化指數(shù)(HIX),但對(duì)可溶性有機(jī)氮(DON)無顯著影響.土壤溶液DOM濃度存在明顯的季節(jié)變動(dòng),夏秋季顯著高于春冬季.傅里葉紅外光譜結(jié)果表明,森林土壤溶液DOM在6個(gè)區(qū)域的相似位置存在吸收峰,其中1145~1149 cm~(-1)的吸收峰最強(qiáng).三維熒光光譜表明,DOM主要以類蛋白質(zhì)物質(zhì)(Ex/Em=230 nm/300 nm)和微生物降解產(chǎn)物(Ex/Em=275 nm/300 nm)為主,施氮使0~15 cm土層類蛋白質(zhì)物質(zhì)減少.氮沉降可能主要是通過降低土壤pH、抑制土壤碳礦化和刺激植物生長(zhǎng)等途徑顯著抑制土壤溶液DOC濃度,而表層被抑制的DOC成分以類蛋白質(zhì)物質(zhì)和羧酸鹽物質(zhì)為主.氮沉降短期可能有利于土壤肥力的儲(chǔ)存,但隨著氮沉降量的積累,土壤中營(yíng)養(yǎng)物質(zhì)將難以得到有效利用.
[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.
【作者單位】： 福建師范大學(xué)地理科學(xué)學(xué)院;濕潤(rùn)亞熱帶山地生態(tài)國(guó)家重點(diǎn)實(shí)驗(yàn)室培育基地;衡陽師范學(xué)院城市與旅游學(xué)院;
【基金】：國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目(31130013)資助~~
【分類號(hào)】：S714.2

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