本文關(guān)鍵詞： 疏勒河上游 凍土退化 土壤微生物 變化特征 環(huán)境因素　出處：《生態(tài)學(xué)雜志》2017年10期 　論文類型：期刊論文

【摘要】：在氣候變暖及人類活動的雙重干擾下,疏勒河上游凍土發(fā)生了顯著退化,具體表現(xiàn)為活動層厚度加大、植被退化等。然而,關(guān)于凍土退化對微生物的影響還未見報道。本文以疏勒河上游不同季節(jié)(4月、6月、9月)、不同退化程度凍土為對象,研究了可培養(yǎng)細(xì)菌數(shù)量的季節(jié)性變化及其影響因素。結(jié)果表明:研究區(qū)域可培養(yǎng)細(xì)菌數(shù)量介于0.4×10~7~5.3×10~7CFU·g~(-1),3個月份土壤可培養(yǎng)細(xì)菌數(shù)量均隨凍土退化程度增加而顯著下降,且同種類型凍土6月份樣品中可培養(yǎng)細(xì)菌數(shù)量最多,但不同類型凍土細(xì)菌數(shù)量的季節(jié)變化未表現(xiàn)出一致的規(guī)律性。相關(guān)性分析表明,可培養(yǎng)細(xì)菌數(shù)量與土壤含水量、總氮呈極顯著正相關(guān),與有機(jī)碳呈顯著正相關(guān)。這些結(jié)果表明,伴隨著凍土退化而發(fā)生的地上植被逆向演替過程中,青藏高原不同類型凍土間已產(chǎn)生較大的環(huán)境異質(zhì)性如土壤碳氮及含水量,進(jìn)一步可能導(dǎo)致凍土微生物數(shù)量分異。研究結(jié)果為利用微生物綜合評價青藏高原不同類型凍土的生態(tài)環(huán)境提供了數(shù)據(jù)基礎(chǔ)。
[Abstract]:Due to the double interference of global warming and human activities, the frozen soil in the upper reaches of Shule River has undergone significant degradation, such as increasing the thickness of active layer and degenerating vegetation, etc. The effects of permafrost degradation on microbes have not been reported. In this paper, the different seasons (April, June, September) of the upper reaches of the Shule River are taken as the objects. The seasonal variation of culturable bacteria and its influencing factors were studied. The results showed that the number of culturable bacteria in the study area was between 0.4 脳 10 ~ (7) (5.3 脳 10 ~ (7) CFU 路g ~ (-1)). In three months, the number of culturable bacteria decreased significantly with the increase of the degree of frozen soil degradation, and in June, the number of culturable bacteria of the same type of frozen soil was the highest. The correlation analysis showed that the number of culturable bacteria was positively correlated with soil water content and total nitrogen content. These results indicate that the reverse succession of aboveground vegetation occurs with the degradation of permafrost. The environmental heterogeneity of different types of frozen soil in Qinghai-Xizang Plateau, such as soil carbon, nitrogen and water content, has been great. The results provide a data basis for the comprehensive evaluation of the ecological environment of different types of frozen soil in the Qinghai-Tibet Plateau.
【作者單位】： 太原師范學(xué)院地理科學(xué)學(xué)院;中國科學(xué)院西北生態(tài)環(huán)境資源研究院內(nèi)陸河流域生態(tài)水文重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院西北生態(tài)環(huán)境資源研究院沙漠與沙漠化重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院西北生態(tài)環(huán)境資源研究院甘肅省極端環(huán)境微生物資源與工程重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家科技支撐計劃項(xiàng)目(2014BAC05B02) 國家自然科學(xué)基金項(xiàng)目(31570498和31470544) 山西省面五青年基金項(xiàng)目(201701D221225)資助
【分類號】：S154.3
【正文快照】： 凍土是地球上最極端環(huán)境之一,是地質(zhì)歷史和氣候變遷背景下受區(qū)域地理環(huán)境、地質(zhì)構(gòu)造、巖性、水文和植被特征等因素影響下形成的的客觀地質(zhì)體,作為冷氣候的產(chǎn)物之一,凍土覆蓋了全球超過20%的陸地表層,在地氣間物質(zhì)和能量交換過程中發(fā)揮著重要作用,被稱為全球變化敏感帶(Zhang e

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