本文選題：紅壤 + 旱地土�。� 參考：《環(huán)境科學(xué)學(xué)報(bào)》2017年12期

【摘要】：為進(jìn)一步理解紅壤旱地土壤中碳源與土壤氮養(yǎng)分之間的耦合作用機(jī)制,以華中地區(qū)典型紅壤旱地土壤為研究對(duì)象,運(yùn)用靜態(tài)培養(yǎng)法,設(shè)置室內(nèi)培養(yǎng)試驗(yàn),研究了添加葡萄糖、乙酸、草酸3種碳源對(duì)紅壤旱地土壤中氮素礦化及反硝化的影響.結(jié)果表明,在25℃好氧培養(yǎng)下,不同碳源的添加對(duì)土壤氮素轉(zhuǎn)化的影響具有較大差異.具體表現(xiàn)為:與對(duì)照處理(CK)相比,添加葡萄糖在整個(gè)培養(yǎng)期間內(nèi)顯著地促進(jìn)了土壤可溶性有機(jī)氮(DON)含量的減少(p0.01),在培養(yǎng)第1 d,添加葡萄糖顯著地促進(jìn)了氧化亞氮(N_2O)的排放、硝態(tài)氮(NO_3~--N)含量的減少(p0.01);添加乙酸也顯著促進(jìn)了上述過(guò)程(p0.05),但促進(jìn)作用沒(méi)有葡萄糖強(qiáng)烈;而添加草酸對(duì)上述過(guò)程的促進(jìn)不顯著.30 d培養(yǎng)結(jié)束后,葡萄糖、乙酸、草酸3種處理的DON含量分別為14.84、19.46和23.47 mg·kg~(-1),比CK處理(24.20 mg·kg~(-1))分別減少了38.68%、19.59%、3.02%;葡萄糖、乙酸、草酸3種處理的NO_3~--N含量分別為8.77、13.89和20.42 mg·kg~(-1),比CK處理(17.23 mg·kg~(-1))分別減少了49.10%、19.38%和增加了18.51%.研究表明,碳源的可利用性是促進(jìn)土壤氮素礦化和反硝化的關(guān)鍵因素.
[Abstract]:In order to further understand the coupling mechanism between carbon sources and soil nitrogen nutrients in the upland soils of red soil, the typical red soil upland soils in central China were studied in this paper. The static culture method was used to set up an indoor culture experiment to study the addition of glucose. Effects of three carbon sources, acetic acid and oxalic acid, on nitrogen mineralization and denitrification in red soil upland soils. The results showed that under aerobic culture at 25 鈩，

本文編號(hào)：1955301