本文關(guān)鍵詞： 碳 氮 磷 干物質(zhì) 化學(xué)計量學(xué) 水生植物　出處：《水生態(tài)學(xué)雜志》2017年06期 　論文類型：期刊論文

【摘要】：為揭示水生植物分解過程中的生態(tài)化學(xué)計量學(xué)特征,選取沉水植物苦草(Vallisneria natans)和馬來眼子菜(Potamogeton malaianus)以及漂浮植物浮萍(Lemna minor),分別置于溫室(處理組A、B)和池塘中(處理組C),實(shí)驗時間為5周,每隔1周隨機(jī)從各重復(fù)組中取1份樣品,測定干物質(zhì)重和總氮(TN)、總碳(TC)、總磷(TP)含量,分析其殘存干物質(zhì)的分解過程。結(jié)果表明,在整個分解過程中,3種植物的C/N為7.43~10.06,低于全球水平22.5,C/P為43.09~91.77,明顯高于全球水平23.2,說明同一種植物在相同的同化C能力前提下,對N的利用效率較高,對P的利用率較低;N/P為4.71~9.24,小于14,說明植物主要受N的限制。沉水植物苦草和馬來眼子菜的C/N在溫室和自然條件下規(guī)律一致,而漂浮植物浮萍則變化較大,說明沉水植物分解C和N的速率一致且不受環(huán)境影響,而漂浮植物浮萍分解C和N受環(huán)境影響較大;苦草和浮萍?xì)埓娓晌镔|(zhì)C/N在開始有一個快速增長期,說明這2種植物N的釋放速率超過C;3種植物殘存干物質(zhì)的C/P和N/P都在第1周快速增長且各處理變化較大,說明3種植物P分解速率都在1周內(nèi)超過C和N,且受環(huán)境影響較大。研究結(jié)果將對水生態(tài)修復(fù)過程中是否移除殘存水生植物提供理論依據(jù)。
[Abstract]:In order to reveal the characteristics of ecochemometrics in the decomposition of aquatic plants. The submerged plants Vallisneria natansa, Potamogeton malaianus and the floating plant duckweed were selected. Lemna minor. They were placed in greenhouse (treatment group Anb) and in pond (treatment group C _ (2)) for 5 weeks. One sample was randomly taken from each repeated group every 1 week to determine dry matter weight and total nitrogen (TNN). The decomposition process of the residual dry matter was analyzed. The results showed that the C / N of the three plants was 7.43 ~ 10.06 during the whole decomposition process. Lower than the global level of 22.5% C / P was 43.09 ~ 91.77, which was significantly higher than that of the global level of 23.2, which indicated that the same plant had higher N use efficiency under the condition of the same assimilation ability of C. The utilization rate of P was low; The N / P was 4.71 ~ 9.24, less than 14, indicating that the plant was mainly restricted by N. The C / N ratio of the submerged plants was consistent with the natural conditions in greenhouse and natural conditions. The rate of decomposition of C and N by submerged plants was the same and was not affected by environment, while the decomposition of C and N by floating plants was more affected by environment. There was a rapid growth period at the beginning of dry matter (C / N) residual in the two species, which indicated that the N release rate of the two plants was higher than that of C. The C / P and N / P of the three plant residues increased rapidly in the first week, which indicated that the decomposition rate of P was higher than that of C and N in the first week. The results will provide theoretical basis for the removal of residual aquatic plants in the process of water ecological restoration.
【作者單位】： 中冶華天工程技術(shù)有限公司;中國科學(xué)院南京地理與湖泊研究所湖泊科學(xué)與環(huán)境國家重點(diǎn)實(shí)驗室;
【基金】：南京市科技計劃項目(201608016) 國家自然科學(xué)基金(31270409)
【分類號】：X173
【正文快照】： 生態(tài)化學(xué)計量學(xué)的概念是在2000年由Elser第一次明確提出的(Elser et al,2000a),其理論被生態(tài)學(xué)家所認(rèn)同,研究主要集中于全球碳(C)、氮(N)、磷(P)生物地球化學(xué)循環(huán)和生態(tài)學(xué)過程、植物限制性元素的判斷等領(lǐng)域(Bryan et al,2012)。植物是生態(tài)系統(tǒng)的一個重要組成部分,對生態(tài)系統(tǒng)的

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