【摘要】：為了解非生長季農(nóng)田土壤氮素轉化過程,采用室內(nèi)凍融模擬培養(yǎng)試驗研究了不同凍融溫度和凍融循環(huán)次數(shù)對東北4種典型農(nóng)田土壤(棕壤、褐土、草甸土、黑土)可溶性氮組分含量的影響。結果表明:隨著凍結溫度降低,4種農(nóng)田土壤可溶性無機氮(DIN,NO_3~ -N+NH_4~+-N)、可溶性有機氮(DON)和可溶性全氮(DTN)含量均顯著增加。隨著融化溫度升高,除NH_4~+-N含量顯著升高外,4種農(nóng)田土壤NO_3~ -N、DON和DTN含量的變化行為受凍結溫度和土壤類型的協(xié)同影響。隨著凍融循環(huán)次數(shù)增加,棕壤和褐土NO_3~ -N、NH_4~+-N、DON和DTN含量均顯著增加;草甸土NO_3~ -N、DON和DTN含量均顯著增加,而NH_4~+-N含量顯著降低;黑土NO_3~ -N和NH_4~+-N含量均顯著降低,而DON和DTN含量則先升高后降低。不同類型土壤受凍融作用影響的響應能力不同,其大小順序為褐土棕壤、草甸土黑土。可見,凍融作用促進了土壤氮素轉化,有利于土壤有效氮的累積,為春季作物生長提供足夠的氮素,但同時也增加了土壤氮素流失風險。
[Abstract]:In order to understand the process of nitrogen transformation in non-growing season farmland soil, four typical farmland soils (brown soil, cinnamon soil, meadow soil) were studied by using indoor freezing and thawing simulation culture experiments with different freezing and thawing temperatures and times of freeze-thaw cycles. The effect of soluble nitrogen content in black soil. The results showed that the contents of soluble organic nitrogen (DON) and soluble total nitrogen (DTN) increased significantly with the decrease of freezing temperature. With the increase of melting temperature, the variation behavior of NO3- N- don and DTN contents in four kinds of farmland soils except NH4- N was influenced by the synergistic effect of freezing temperature and soil type. With the increase of freeze-thaw cycles, the contents of no _ 3 ~ -N _ 4 ~ -N _ n and DTN in brown soil and cinnamon soil increased significantly, the contents of no _ 3 ~ -N _ (-N) and DTN in meadow soil increased significantly, while the content of NH _ 4 ~ -N decreased significantly, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in black soil, and the contents of no _ 3 ~ -N and NH _ 4 ~ -N decreased significantly in brown soil and cinnamon soil. The contents of DON and DTN increased first and then decreased. The response ability of different types of soils affected by freezing and thawing was different. The order of their size was brown soil of cinnamon soil and black soil of meadow soil. It can be seen that freezing and thawing promoted soil nitrogen conversion, which was beneficial to the accumulation of soil available nitrogen, and provided sufficient nitrogen for crop growth in spring, but also increased the risk of soil nitrogen loss.
【作者單位】： 沈陽農(nóng)業(yè)大學土地與環(huán)境學院;遼寧省農(nóng)業(yè)科學院植物營養(yǎng)與環(huán)境資源研究所;冠縣農(nóng)業(yè)局;
【基金】：國家自然科學基金項目(41301253) 遼寧省農(nóng)業(yè)領域青年科技創(chuàng)新人才培養(yǎng)計劃項目(2014018) 公益性行業(yè)(農(nóng)業(yè))科研專項(201503118-08) 國家科技支撐計劃項目(2013BAD05B07)資助
【分類號】：S153.6

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相關期刊論文 前10條

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