本文選題：凍融過(guò)程 + 土壤　； 參考：《農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào)》2016年12期

【摘要】：凍融是我國(guó)北方地區(qū)常見(jiàn)的氣候現(xiàn)象,其水熱條件的反復(fù)變化會(huì)影響土壤等環(huán)境介質(zhì)的物理化學(xué)及生物學(xué)性質(zhì)。凍融過(guò)程產(chǎn)生的交替收縮與膨脹可改變土壤結(jié)構(gòu)、水分分布特征,尤其會(huì)降低土壤團(tuán)聚體的穩(wěn)定性;由于溫度、水分、氧化還原等條件的不斷變化,凍融過(guò)程會(huì)促進(jìn)土壤硝化作用和溶解性有機(jī)酸的釋放,使土壤微生物量及其活性受到影響,導(dǎo)致土壤pH值、CEC和Ca CO_3含量等隨之降低。在凍融過(guò)程中,土壤有機(jī)質(zhì)的變化最為明顯,反復(fù)凍融使有機(jī)碳不同程度地暴露和釋放,加快了土壤有機(jī)碳礦化速率,使土壤可溶性有機(jī)碳量增加,最終加劇可溶性有機(jī)碳的流失。以往對(duì)凍融作用的研究主要集中在自然土壤介質(zhì),缺乏對(duì)其他環(huán)境介質(zhì)如畜禽糞便等有機(jī)固體廢棄物的相關(guān)報(bào)道。在綜述凍融過(guò)程對(duì)土壤物理、化學(xué)及生物學(xué)性質(zhì)影響的基礎(chǔ)上,提出了未來(lái)在一定區(qū)域尺度上開(kāi)展凍融過(guò)程對(duì)土壤理化性質(zhì)影響研究,并結(jié)合探討畜禽糞便等有機(jī)固體廢棄物和土壤污染物的響應(yīng)機(jī)制,為凍融氣候條件下土壤污染控制和科學(xué)土地利用管理提供科學(xué)依據(jù)。
[Abstract]:Freezing and thawing is a common climatic phenomenon in northern China. The repeated changes of water and heat conditions will affect the physical, chemical and biological properties of soil and other environmental media.The alternate shrinkage and expansion produced by freezing and thawing process can change the soil structure and water distribution, especially reduce the stability of soil aggregates, because of the constant change of temperature, moisture, redox, etc.Freezing and thawing can promote soil nitrification and release of soluble organic acids, affect soil microbial biomass and its activity, and decrease soil pH and Ca CO_3 content.In the process of freezing and thawing, the change of soil organic matter was most obvious. Repeated freezing and thawing made organic carbon exposed and released to different degrees, accelerated the mineralization rate of soil organic carbon, and increased the content of soil soluble organic carbon.Ultimately, the loss of soluble organic carbon is aggravated.Previous studies on freeze-thawing mainly focused on natural soil media, and lack of related reports on other environmental media such as animal manure and other organic solid wastes.Based on the review of the effects of freezing and thawing on the physical, chemical and biological properties of soil, it is proposed that the effects of freezing and thawing on the physical and chemical properties of soils should be studied at a certain regional scale in the future.The response mechanism of organic solid wastes and soil pollutants such as livestock and poultry manure was discussed to provide scientific basis for soil pollution control and scientific land use management under freezing and thawing climate.
【作者單位】： 北京師范大學(xué)環(huán)境學(xué)院水環(huán)境模擬國(guó)家重點(diǎn)實(shí)驗(yàn)室;北京市土肥工作站;中國(guó)科學(xué)院地理科學(xué)與資源研究所;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(21577007,21277013) “十三五”國(guó)家重點(diǎn)研發(fā)計(jì)劃重點(diǎn)專項(xiàng)(2016YFD0800204)
【分類號(hào)】：S151.9

【相似文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 吳浩浩;干濕交替及凍融過(guò)程對(duì)溫帶森林土壤溫室氣體凈通量的影響[D];長(zhǎng)安大學(xué);2014年

，

本文編號(hào)：1736614