本文選題：氮沉降 + 微生物生物量�。� 參考：《生態(tài)學(xué)報》2017年01期

【摘要】：氮沉降對土壤微生物的擾動可能會影響土壤的養(yǎng)分循環(huán),然而關(guān)于中亞熱帶天然林土壤微生物及酶活性對氮沉降的響應(yīng)鮮有報道。通過3 a的氮沉降模擬實驗,研究中亞熱帶米櫧天然林土壤的理化性質(zhì)、土壤微生物量及土壤酶活性的響應(yīng)。結(jié)果表明:氮沉降并未引起土壤的有機碳和總氮顯著性變化;高氮(80 kg N hm~(-2)a~(-1))處理下,土壤p H下降,出現(xiàn)酸化現(xiàn)象;低氮(40 kg N hm~(-2)a~(-1))處理促進淋溶層(A層)中土壤纖維素分解酶(β-葡萄糖苷酶和纖維素水解酶)和木質(zhì)素分解酶(多酚氧化酶和過氧化物酶)活性升高,同時促進土壤微生物生物量碳、氮的積累。冗余分析(RDA)表示,可溶性有機碳(DOC)是驅(qū)動A層土壤酶活性的重要環(huán)境因子;而在淀積層(B層),這4種酶活性并未發(fā)生顯著性差異。施氮處理后,A、B層中土壤的酸性磷酸酶活性增加(P0.05)。研究表明:低水平氮沉降增加了土壤微生物生物量碳氮含量以及土壤有機碳分解相關(guān)酶活性,從而加速了土壤碳周轉(zhuǎn);這為未來氮沉降增長背景下,探索中亞熱帶天然林土壤碳源匯問題提供了依據(jù)。
[Abstract]:The disturbance of nitrogen deposition on soil microorganisms may affect the nutrient cycling of soil. However, there are few reports on the response of soil microbial and enzyme activities to nitrogen deposition in natural forests in the middle subtropics. The physical and chemical properties, soil microbial biomass and soil enzyme activity of Castanopsis carlesii natural forest in the middle subtropics were studied by simulating nitrogen deposition for 3 years. The results showed that nitrogen deposition did not cause significant changes in soil organic carbon and total nitrogen, and soil pH decreased and acidified under high nitrogen (80 kg N hm ~ (-2) a ~ (-1) treatment. Low nitrogen (40 kg N hm ~ (-2) a ~ (-1) increased the activities of soil cellulolytic enzymes (尾 -glucosidase and cellulose hydrolase) and ligninolytic enzymes (polyphenol oxidase and peroxidase) in the leaching layer (layer A). At the same time, promote the accumulation of soil microbial biomass carbon and nitrogen. Redundancy analysis (RDA) showed that soluble organic carbon (DOC) was an important environmental factor driving soil enzyme activity in layer A, but there was no significant difference among the four enzymes in the deposition layer (layer B). The activity of acid phosphatase increased after nitrogen application (P0.05). The results show that low level nitrogen deposition increases soil microbial biomass carbon and soil organic carbon decomposition related enzyme activity, thus accelerates soil carbon turnover. The study of soil carbon source and sink in the middle subtropical natural forest provides the basis.
【作者單位】： 福建師范大學(xué)地理科學(xué)學(xué)院;福建師范大學(xué)濕潤亞熱帶山地生態(tài)國家重點實驗室培育基地;
【基金】：國家自然科學(xué)基金重點資助項目(31130013) 國家“973”計劃資助項目(2014CB954003)
【分類號】：S714

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