|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 示踪全球环境变化的微生物代用指标显示文摘文章详细总结了示踪全球环境变化的一系列微生物替代指标。重建古温度的定量指标包括藻类长链烯酮的U、古菌甘油二烷基甘油四醚化合物(GDGTs)的TEX_(86)指标、细菌GDGTs的甲基化指数(MBT)与环化指数(CBT)的组合。古温度的定性指标有脂类单体的氢同位素组成、不饱和脂肪酸的相对含量、有孔虫和硅藻的组合及其生物体的同位素组成和微量元素比值。重建古水文的指标包括有壳变形虫组合、细菌GDGTs的环化指数CBT、细菌和古菌GDGTs的陆源输入指数BIT、古菌和细菌GDGTs的相对丰度R、直链脂肪族化合物的碳优势指数CPI、好氧与厌氧微生物的丰度。古大气CO_2分压的估算可采用藻类长链烯酮的碳同位素组成、有孔虫的硼同位素组成。认为这些微生物指标在古环境重建中潜力巨大,并对一些重要微生物指标的应用原理和限定条件进行了分析。有些指标因受多种环境因子和成岩作用的影响,在应用中需特别的注意,不能无限夸大其应用领域。 | 谢树成 黄咸雨 杨欢 秦养民 | 2013 | 第四纪研究2013，33，1： | 31 |
| 2 | 河南封丘县域农田土壤固碳速率空间变异特征及其影响因素显示文摘农田土壤固碳速率是评价土壤固碳效应和潜力的重要指标,精确估算区域农田土壤固碳速率对土壤地力及环境效应均具有重要意义.本研究选取黄淮海平原典型潮土区河南省封丘县为研究区域,按照土壤利用-土壤类型联合单元布点法,于2011年采集了70个耕层土样,测定了土壤有机碳含量、机械组成、容重、pH,并与全国第二次土壤普查(1981年)数据进行对比分析,结合地统计方法和GIS技术研究了该地区近30年农田土壤固碳速率的空间变异特征,利用显著性检验、回归分析、方差分析等方法定量分析了该区域农田土壤固碳速率的影响因素.结果表明:近30年封丘县域土壤固碳速率平均值为0.33 t C·hm^(-2)·a^(-1),变异系数为74%,属于中等变异性;土壤固碳速率的变化在东西方向上表现为西高东低、中部高南北低,呈片状分布,区域结构性因素是引起农田土壤固碳速率空间分布差异的主导因素,如土壤类型、机械组成、容重、pH,可解释空间变异的59.5%,其次是随机性因素,如秸秆还田量、施肥量,可解释空间变异的40.5%. | 赵占辉 张丛志 刘昌华 蔡太义 张佳宝 | 2016 | 应用生态学报2016，27，5： | 10 |
| 3 | Environmental impacts on the distribution of microbial tetraether lipids in Chinese lakes with contrasting pH: Implications for lacustrine paleoenvironmental reconstructions显示文摘Glycerol dialkyl glycerol tetraethers(GDGTs) in lake sediments are useful biomarkers for the continental paleoclimatic reconstruction. However, the environmental controls on the distribution of these compounds, in particular the 6-methyl isomers of bacterial branched GDGTs(bGDGTs), in the lakes with contrasting pH, are still unknown, hindering their application for paleo-reconstructions. Here, we investigated the environmental impacts on the distribution of GDGTs in 17 alkaline lakes and 1 acid lake in China. It was found that the dissolved oxygen content in water column may have an impact on the distribution of archaeal isoprenoid GDGTs(iGDGTs) by causing the change in archaeal communities. The ratio of GDGT-0/crenarchaeol increases with decreasing oxygen content, indicating that the relative abundance of anaerobic methanogenic archaea or Miscellaneous Crenarchaeotic Group(MCG) vs. aerobic Thaumarchaeota is controlled by the oxygen content dissolved in water of these lakes. Thaumarchaeota are likely to contribute only a small proportion of iGDGTs in the relatively oxygen-depleted lakes, and thus TEX_(86) is not suitable for the reconstruction of the surface temperature of these lakes. The abundance ratio of iGDGTs to bGDGTs(R_(i/b)) appears to show no relationship with water pH in all the lakes, but exhibits a significant positive correlation with the water depth of the acid Lake Qinghai in Tengchong. As expected, the methylation degree of bGDGTs(MBT′) was found to correlate with both mean annual air temperature(MAT) and water pH, and the cyclization degree of bGDGTs(CBT) correlates only with water pH in these lakes. However, the MBT′_(5ME), an index to measure the methylation degree of 5-methyl bGDGTs, exhibits no relationship with MAT, whereas MBT′_(6ME), the methylation degree of 6-methyl bGDGTs, was found to correlate significantly with MAT. This is opposite to the situation observed in the global soils, pointing to a different adaptation of b GDGT-producing bacteria to environmental variables or different microbial sources of bGDGTs in these lakes. The relative abundance of 6- vs. 5-methyl bGDGTs is controlled by pH in these lakes, similar to that observed in worldwide soils. Hence, the isomer ratio(IR) of 6-methyl bGDGTs or CBT′ can be used as a proxy for water pH, although they might be influenced by other environmental factors including temperature in the lakes with a narrow range of pH. | DANG XinYue XUE JianTao YANG Huan XIE ShuCheng | 2016 | Science China Earth Sciences2016，59，5： | 9 |
| 4 | 青藏高原东部现代泥炭GDGTs分布特征及环境意义显示文摘运用HPLC-APCI-MS详细分析了青藏高原东部红原现代泥炭(32°46′N,102°31′E)和越西现代泥炭(28°46′N,102°34′E)中甘油二烷基甘油四醚类脂物(glycerol dialkyl glycerol tetraethers,简称GDGTs)的组成及分布特征,检测出了丰富的GDGTs化合物,显示研究区分布着产甲烷菌、氨氧化古菌、细菌等多种微生物。其中,细菌支链GDGTs(branchedGDGTs,简称bGDGTs)丰度明显高于占菌类异戊二烯GDGTs(isoprenoidGDGTs,简称iGDGTs)。无环的GDGT-0和archaeol是古菌iGDGTs的主要组分,说明古菌以产甲烷菌为主。bGDGTs中Ia与IIa中度最高,由CBT(环化指数)参数得到的pH值与泥炭实测pH值相近,但基于MBT(甲基化指数)-CBT指标得到的年平均大气温度(MAT)与两研究区现代年平均温度有一定差别。通过该项工作发现今后进行区域细菌bGDGTs相关环境参数的校正是十分必要的。 | 李奇缘 刘潇敏 王章章 郑艳红 | 2016 | 第四纪研究2016，36，2： | 9 |
| 5 | Distribution of GDGTs in lake surface sediments on the Tibetan Plateau and its influencing factors显示文摘Quantitative paleotemperature records are vital not only for verifying and improving the accuracy of climate model simulations, but also for estimating the amplitude of temperature variability under global warming scenarios. The Tibetan Plateau(TP) affects atmospheric circulation patterns due to its unique geographical location and high elevation, and studies of the mechanisms of climate change on the TP are potentially extremely valuable for understanding the relationship of the region with the global climate system. With the development of biomarker-based proxies, it is possible to use lake sediments to quantitatively reconstruct past temperature variability. The source of Glycerol Dialkyl Glycerol Tetraethers(GDGTs) in lake sediments is complex, and their distribution is controlled by both climatic and environmental factors. In this work, we sampled the surface sediments of 27 lakes on the TP and in addition obtained surface soil samples from six of the lake catchments. We analyzed the factors that influence GDGT distribution in the lake sediments, and established quantitative relationship between GDGTs and Mean Annual Air Temperature(MAAT). Our principal findings are as follows: the majority of GDGTs in the lake sediments are b GDGTs, followed by crenarchaeol and GDGT-0. In most of the lakes there were no significant differences between the GDGT distribution within the lake sediments and the soils in the same catchment, which indicates that the contribution of terrestrial material is important. i GDGTs in lake sediments are mainly influenced by water chemistry parameters(p H and salinity), and that in small lakes on the TP, TEX_(86) may act as a potential proxy for lake p H; however, in contrast b GDGTs in the lake sediments are mainly controlled by climatic factors. Based on the GDGT distribution in the lake sediments, we used proxies(MBT, CBT) and the fractional abundance of b GDGTs(f_(abun)) to establish calibrations between GDGTs and MAAT, respectively, which potentially provide the basis for paleoclimatic reconstruction on the TP. | WANG MingDa LIANG Jie HOU JuZhi HU Liang | 2016 | Science China Earth Sciences2016，59，5： | 8 |
| 6 | 喜马拉雅山南坡海拔梯度表土GDGTs分布特征及其指示意义显示文摘甘油二烷基甘油四醚脂类化合物(GDGTs)可记录陆地古气候环境变化。然而,古菌产生的类异戊二烯GDGTs(iGDGTs)、细菌产生的支链GDGTs(bGDGTs)及其异构体(5-,6-甲基bGDGTs)在不同海拔梯度环境中的分布及其影响因素仍不甚清晰。本文利用高效液相色谱-大气压化学电离-质谱(HPLC-APCI-MS)对喜马拉雅山南坡尼泊尔境内安纳普娜山地区沿海拔梯度971~5307m的26个表土样品中的GDGTs化合物进行分析,利用3根硅胶柱串联(硅胶柱型号:Hypersil GOLD Silica,100mm×2.1mm,1.9μm)的方法分离了bGDGTs化合物的5-,6-甲基同分异构体。在所有土壤样品中均检测到了iGDGTs与bGDGTs化合物。与环境因子进行分析发现iGDGTs的相对丰度随土壤pH的升高而增大。基于bGDGTs化合物的MBT'5ME指标与年均温(MAT)显著相关,而MBT'6ME受土壤pH值影响明显,并发现6-甲基bGDGTs的存在是影响MBT'与MAT相关性的主要因素。分析发现最近新定义的pH指标IRⅢ a'、IRⅡa'在安纳普娜山地区与pH没有显著的相关性,说明该pH指标不适用于安纳普娜山地区。剔除6-甲基bGDGTs,本文建立了MBT'5ME与MAT的转换方程:MAT=-11.396+34.521×MBT'5ME(n=26,R2=0.874,RMSE=2.0℃,p〈0.001)以及MAT=-11.418+34.776×MBT'5ME-0.269×CBT5ME(n=26,R2=0.874,RMSE=2.08℃,p〈0.001)。利用上述方程重建的安纳普娜山地区MAT的气温直减率(ΔT=-0.45℃/100m)与由WorldClim数据集提取的采样点MAT计算的气温直减率(ΔT=-0.50℃/100m)基本一致,同时也与由尼泊尔境内56个气象台站气象数据计算的喜马拉雅山中部南坡气温直减率(ΔT=-0.52℃/100m)以及由青藏高原南部气象台站气象数据计算的青藏高原南部气温直减率(ΔT=-0.48℃/100m)基本一致,但低于全球平均气温直减率(ΔT=-0.65℃/100m)。本研究说明在安纳普娜地区MBT'5ME以及MBT'5ME/CBT5ME指标可以用来重建喜马拉雅山南坡地区的古温度和古海拔变化。本文建立的转换方程为用bGDGTs指标定量重建喜马拉雅山南坡地区的古温度和古海拔奠定了研究基础。 | 李秀美 朱二雷 王明达 梁洁 王兆峰 梁尔源 侯居峙 | 2017 | 第四纪研究2017，37，6： | 7 |
| 7 | 微生物四醚膜脂化合物在湖泊环境中的研究进展显示文摘近十几年来,甘油二烷基甘油四醚类化合物(GDGTs)已成为生物地球化学研究的热点,此类化合物广泛分布在海洋、湖泊、土壤、泥炭以及热泉等不同类型的环境载体中,并且携带丰富的环境信息,基于此类化合物分布构建的参数已成为重建古环境变迁的重要指标。本文首先从GDGTs化合物的结构以及生物来源出发,重点阐述了基于此类化合物构建的几个指标TEX86、BIT、MBT/CBT以及ACE在湖泊环境研究中的应用及存在的不足,随后概述了特殊类型湖泊即富营养、高盐度湖泊中GDGTs化合物的分布特征,最后对GDGTs化合物在湖泊环境的研究提出总结以及展望。 | 李婧婧 谢树成 | 2015 | 矿物岩石地球化学通报2015，34，2： | 7 |
| 8 | A 12-kyr record of microbial branched and isoprenoid tetraether index in Lake Qinghai,northeastern Qinghai-Tibet Plateau:Implications for paleoclimate reconstruction显示文摘Branched and Isoprenoid Tetraether(BIT) index was considered as a proxy for terrestrial organic matter input in lake sediments, based on the assumption that branched glycerol dialkyl glycerol tetraethers(b GDGTs) are mainly derived from terrestrial soils. However, mounting evidences have showed that the in situ production of b GDGTs is widespread in lakes, challenging BIT as a reliable terrestrial input proxy. Recently, BIT has been proven to be a reliable proxy for paleohydrology in a small crater lake(Lake Challa) in accordance with a different mechanism. However, the response of BIT to paleohydrology variation may differ for different lakes. In this study, we investigate the variations in the BIT index and the concentrations of its related GDGTs in a 12-ka sediment core from Lake Qinghai, in combination with our previous results for surface sediments. We find that variations in BIT strongly depend on the concentration of crenarchaeol in both surface and ancient sediments of this lake, whereas b GDGT concentration varies much less remarkably. Considering that crenarchaeol production is positively correlated with water depth in Lake Qinghai, water depth may exert negative control on the BIT index in this lake. This case is inconsistent with the positive relationship between BIT and lake levels or rainfall intensity reported for Lake Challa, suggesting that the response of BIT to local paleohydrology is site specific in lacustrine systems. Hence, the application of sedimentary BIT as a paleohydrological proxy in a specific lake requires caution before confirming the environmental controls on BIT in that lake. | WANG HuanYe DONG HaiLiang ZHANG ChuanLun JIANG HongChen LIU WeiGuo | 2016 | Science China Earth Sciences2016，59，5： | 6 |
| 9 | 实验模拟氧化条件对微生物四醚脂的环境替代指标的影响显示文摘以古菌和细菌细胞膜脂甘油四烷基甘油四醚(GDGTs)为基础建立的古温度指标四醚指数(TEX_(86))与甲基化/环化指标(MBT/CBT),以及陆源输入指标(BIT)与干旱和盐碱化指标R_(i/b),在海洋、湖泊、黄土-古土壤等沉积物的古环境重建中得到了广泛的应用。然而,利用这些微生物分子指标来重建古环境时,氧化等降解因素对GDGTs化合物,尤其是对细菌支链GDGTs的影响目前还不是很清楚。本研究通过过氧化氢模拟不同氧化程度对土壤中GDGTs化合物产生的影响,进而分析古菌和细菌GDGTs不同结构化合物抗氧化能力的差异,了解化学氧化降解对GDGTs各指标的影响。结果表明,古菌类异戊二烯GDGTs抗氧化能力低于细菌支链GDGTs,同时含环的古菌和细菌GDGTs抗化学氧化能力均要低于无环GDGTs。古菌GDGTs古温度指标TEX_(86)在氧化过程中逐渐降低,在氧化条件下沉积的古菌GDGTs的TEX_(86)指标用于古温度的重建存在低估的可能。在以无环细菌支链GDGTs为主的环境中,细菌MBT/CBT指标随氧化程度加深其重建温度基本不受影响。古菌与细菌GDGTs抗降解能力的差异导致陆源输入指标BIT指数随着氧化程度增加而升高,在地质体中应用此指标恢复古陆源输入存在高估的可能性。干旱化和盐碱化指标R_(i/b)随着氧化程度加深表现出逐渐降低的趋势,从而在应用上也可能存在低估。需要指出的是,实验室用的过氧化氢比自然条件下氧气的氧化作用强得多,本文的结论反映了一种比较极端的状况。 | 丁伟华 杨欢 何钢强 谢树成 | 2013 | 第四纪研究2013，33，1： | 4 |
| 10 | Distribution of branched glycerol dialkyl glycerol tetraethers in soils on the Northeastern Qinghai-Tibetan Plateau and possible production by nitrite-reducing bacteria显示文摘Branched glycerol dialkyl glycerol tetraethers(b GDGTs) are ubiquitous and abundant in soils, but their sources remain elusive. Recent studies demonstrate that the distributions of b GDGTs are sensitive to various environmental factors. In an effort to understand how and to what extent soil moisture(expressed as soil water content(SWC) or mean annual precipitation(MAP), p H and temperature may impact the distribution of b GDGTs, and to shed more light on the biological sources of b GDGTs in cold and arid regions, we investigated the distribution of b GDGTs as well as bacterial 16 S r RNA gene and functional genes involved in the N cycle(including amo A, nir S and nir K) in 41 surface soil samples from around Lake Qinghai and east of Qaidam Basin on the Northeastern Qinghai-Tibetan Plateau. We found that lower soil moisture reduced the fractional concentrations of cyclic b GDGTs and thus the cyclisation ratio of branched tetraethers(CBT) index correlated negatively with SWC and MAP, suggesting that soil moisture is an important factor controlling b GDGT distributions in soils in this arid and semi-arid region. Two subgroups of b GDGTs were assigned on the basis of cluster analysis, and b GDGT indices behaved differently in the two groups, hinting at different biosynthetic mechanisms for b GDGTs under different environmental conditions. Real time PCR results showed that nir S and nir K genes correlated significantly with the concentration of b GDGTs, suggesting that the nir S- or nir K-encoding bacteria involved in denitrification might potentially be an additional biological source for soil b GDGTs(besides Acidobacteria). Moreover, our results also support the application of new indices based on 5-methyl b GDGTs and 6-methyl b GDGTs in reconstructing past temperature and p H variations in this region. | SUN ChiJun ZHANG ChuanLun LI Fu Yan WANG HuanYe LIU WeiGuo | 2016 | Science China Earth Sciences2016，59，9： | 3 |
| 11 | GDGTs在黄土古环境重建中的研究进展显示文摘甘油二烷基甘油四醚广泛存在于黄土、泥炭、湖泊、海洋等各类沉积载体中,并有效地记录了地质历史时期的古环境信息。简要概述了甘油二烷基甘油四醚的结构、生物源以及常见的甘油二烷基甘油四醚陆地环境代用指标,重点阐述了甘油二烷基甘油四醚在黄土古环境重建中的研究进展,并提出了展望。主要研究进展包括:①甘油二烷基甘油四醚古环境指标在黄土古气候研究中得到了较广泛的应用,并重建了黄土高原地区过去80万年的古温度变化;②黄土高原地区温度变化主要受当地夏季太阳辐射驱动,并受植被下垫面调控;③黄土高原地区末次冰消期降水的增加明显滞后于温度的升高。甘油二烷基甘油四醚在黄土古环境研究中仍存在重建温度偏高、环境指标与气候因子关系复杂等问题。未来对新指标的开发以及区域性转换函数的建立和应用将有望进一步提高甘油二烷基甘油四醚在黄土古环境重建中的准确性,并为解决不同气候区空间上的水-热配置模式和气候变化机制提供依据。 | 田少华 肖国桥 杨欢 | 2020 | 地球科学进展2020，35，5： | 2 |
| 12 | 中国酸碱度不同湖泊四醚脂类分布影响因素及对湖泊古环境重建的启示显示文摘湖泊沉积物中甘油二烷基甘油四醚化合物(GDGTs)在记录陆地古气候方面有着重要作用.然而,这些化合物,尤其是细菌支链GDGTs(bGDGTs)异构体(5-,6-甲基bGDGTs)在中国不同酸碱性湖泊中的分布及其影响因素仍未可知.本文通过对碱酸度不同的湖泊进行对比,并结合其他环境变量,调查了GDGTs各类化合物在中国中东部湖泊系统和西南酸性青海中的分布特征及其影响因素.结果表明,湖水含氧量能够影响湖泊古菌群落结构,从而影响古菌iGDGTs的分布.GDGT-0/crenarchaeol比值随着含氧量降低而增高,表明厌氧的产甲烷古菌或混杂型泉古菌(MCG)与奇古菌相对含量受控于湖水含氧量.含氧量较低的湖泊奇古菌贡献GDGTs化合物比例较小,四醚指数TEX_(86)不能用来重建表层湖水温度.与土壤不同的是,湖水pH并不会影响古菌iGDGTs和细菌bGDGTs的相对含量,但在单一湖泊,如腾冲青海中,古菌与细菌的相对含量(R_(ilb))与水深相关.虽然这些湖泊中细菌bGDGTs的甲基化指数(MBT')与年均大气温度(MAT)和pH(或年均降雨量)相关,环化指数(CBT)仅与pH相关,但基于5-甲基bGDGTs的MBT'_(5ME)与MAT的关系并不明显,反而是表征6-甲基bGDGTs甲基化程度的MBT'_(6ME)与MAT更相关.与全球土壤相似,湖泊中5-,6-甲基bGDGTs的相对含量也主要受pH影响.因此,6-甲基bGDGTs的相对含量(IR)或CBT'可以作为潜在的湖泊pH计.但在较小pH梯度下,IR和CBT'两个指标可能受其他环境因子,如温度等的影响. | 党心悦 薛建涛 杨欢 谢树成 | 2016 | 中国科学:地球科学2016，46，2： | 2 |
| 13 | 晚第四纪黄土古温度定量重建研究进展显示文摘中国黄土是古气候研究的重要陆相沉积载体。定量重建黄土记录的古温度变化信息对于理解气候变化的机制具有十分关键的作用。过去主要借助磁化率、植硅体、游离铁与全铁、甘油二烷基甘油四醚(GDGT)等代用指标对黄土高原地区黄土记录的古温度变化进行定量研究。在简述晚第四纪黄土古温度定量重建常用方法的基础上,对各种指标的局限性进行了分析。准确定量重建黄土记录的古温度序列需要开展多指标、多方法的交叉检验。 | 曾方明 | 2013 | 地质科技情报2013，32，4： | 2 |
| 14 | 中亚阿尔泰山南坡表土和泥炭沉积物GDGTs综合研究显示文摘相对于我国季风区,西北内陆地区表土和泥炭沉积物的甘油二烷基甘油四醚化合物(GDGTs)现代过程研究结果报道较少。对中亚干旱区阿尔泰山南坡海拔梯度表土、高山泥炭地哈拉沙子和那仁夏周边坡地表土以及哈拉沙子表层泥炭沉积物进行了GDGTs分析,结果表明:1)其海拔梯度表土当中细菌来源支链结构GDGTs(brGDGTs)的分子分布特征主要响应于湿度的变化;2)同样主要由于湿度变化的影响,奇古菌的影响和贡献在相对低海拔地区更为明显,产甲烷古菌的影响和贡献在相对高海拔地区上升,导致古菌来源的类异戊二烯结构GDGTs(isoGDGTs)的TEX86参数随海拔上升具有显著的降低趋势;3)哈拉沙子和那仁夏泥炭地泥炭沉积物当中的brGDGTs和isoGDGTs都并非主要来自周边坡地土壤的异源输入,而主要都是泥炭地原地自生来源。这些研究结果,一方面为在该区域利用GDGTs开展古环境、古气候重建提供基础性参考;另一方面,也对其他区域相应研究结果形成有益补充。 | 郭海春 曹建涛 魏士凯 石福习 贾国东 卞昊昆 顾兆炎 饶志国 | 2021 | 第四纪研究2021，41，4： | 2 |
| 15 | 包气带土壤pH对灌溉施肥响应的变异过程显示文摘为了分析灌溉施肥活动引起的包气带土壤pH值变异特征及其对地球化学条件的响应,通过历时3 a的野外原位灌溉施肥试验,应用不同季节灌前、灌后6 m土层中不同深度的测定资料,系统分析了土壤pH对灌溉、施肥的响应过程,结果表明:各深度pH值呈弱变异性(CV=1.01%~2.28%),与灌溉前相比,灌后土壤pH值的均值和变异系数均呈现明显的变化;灌前包气带各层pH具有强烈的空间自相关性,灌后受水分、基质等相互作用影响,pH的空间自相关性有所减弱,C_0/(C_0+C)和变程a分别由7.23 m和3.54 m(灌前0 d)减少到3.26 m和2.76 m(灌后第10天)。土壤基质是决定土壤酸碱性的主要因素,在灌溉施肥活动对pH的响应过程中,地球化学条件(土壤含水量、土壤温度、土壤有机质(SOM)、氧化还原电位(RP)等)、土壤基质组成和氮底物浓度(NH^+_4-N)等的交互作用影响pH的动态。土壤含水量和温度单独对pH影响不显著,两者交互作用对pH有显著影响。引起土壤pH变化的主要变异源为Cl^-、土壤有机质(SOM)、NO^-_3-N、NH^+_4-N等营养物质和不同空间深度土壤基质的差异,表明灌溉施肥改变了包气带pH地球化学动力场、营养物质和土壤基质的交互作用,引起各深度的生物地球化学反应,控制pH值的空间变异特性。当包气带介质土壤水分变化时,首先营养物氨态氮以分子态或水合态形式被介质吸附,H^+得到释放,使得灌后第4天pH值下降。随着氨氧化过程中H^+的释放,pH在灌前和灌后第10天和第30天有显著差异。氨的氧化引起硝酸盐含量不断增加,使得硝酸盐对pH值的影响在灌后不断增强,相关系数由0.24(0 d,P<0.05)增加到0.41(30 d,P<0.01),而氨态氮对pH值的影响逐步降低,相关系数由0.43(0 d,P<0.01)降低为0.19(30 d,P>0.05)。 | 狄龙 刘秀花 胡安焱 谢兰宝 刘光辉 | 2019 | 干旱地区农业研究2019，37，2： | 1 |
| 16 | The spatial distribution of archaeal lipids in a mesoscale subtropical watershed, Southeast China显示文摘Archaea play an important role in global carbon and nitrogen cycles. Archaeal lipids, such as isoprenoid glycerol diakyl glycerol tetraethers(i GDGTs), are important biomarkers tracing change in archaeal community structure and biogeochemical processes in the natural environments. In this research, the spatial distributions of archaeal lipids in the surface sediments of the Jiulong River(JR) and the Jiulong River estuary(JRE) were examined. GDGT-0(containing zero cyclopentyl ring) and crenarchaeol were the most abundant i GDGTs in the JR and JRE. From the rivers to the estuary, the total i GDGTs, GDGT-0, crenarchaeol and archaeol concentrations showed significant spatial variation; in particular, GDGT-0 and archaeol in the river may be predominantly derived in situ from methanogens, whereas crenarchaeol in the estuary mainly derived in situ from Thaumarchaeota. We inferred that archaeal community was dominated by methanogens in the Jiulong River and by Thaumarchaeota in the Jiulong River estuary, which are consistent with change in archaeal community structure observed in other estuarine environments. | LI Xue Ying ZHENG FengF eng CHEN Yu Fei GUO Wen Ting ZHANG TingT ing HU AnY i YU Chang Ping ZHANG Chuan Lun | 2016 | Science China Earth Sciences2016，59，7： | 1 |
| 17 | Flooding impact on the distribution of microbial tetraether lipids in paddy rice soil in China显示文摘Isoprenoid 和分叉的甘油 dialkyl 甘油 tetraethers (GDGT ) 类脂化合物被学习在泛滥并且在武汉的非充满的稻土壤,华中,检验 GDGT 分发的反应到泛滥的土壤。样品在大量涌入四个特定的月的土壤前后被收集。两核心(CL ) 并且未经触动极(IPL ) GDGT 被确定。许多 archaeol 和 caldarchaeol 的增加可能在充满的土壤的 methanogens 的出现是指示的。否定关联在 IPL 的比率之间被观察分叉的 GDGT-IIa 到 GDGT-Ia 和土壤 pH。在酸土壤的土壤 pH 的上升被知道被源于泛滥的氧化还原作用条件控制。因此,分叉的 GDGT 分发可以被水内容在稻土壤控制。另外,我们建议源于泛滥的缺氧的条件可以也控制许多相对 crenarchaeol 的分叉的 GDGT,它接着导致增加分叉并且 isoprenoidal tetraethers (位) 值,为到海洋的沉积的陆上的输入的索引[出版摘要] | Asma AYARI Huan YANG Shucheng XIE | 2013 | Frontiers of Earth Science2013，7，3： | 0 |
| 18 | 中国干旱-半干旱区表土bGDGTs与气候环境因子数据再分析显示文摘文章通过收集中国北方干旱-半干旱区域已发表的bGDGTs数据,重新计算了不同地区表土bGDGTs各组分与温度及pH等环境因子之间的相关关系。主要获得以下认识:1)不同于干旱区,半干旱区bGDGTs的异构体指标与土壤pH表现为强相关,在4个异构体指标(IBT、CBT'、IR'_(Ⅱa)、IR'_(Ⅲa))中CBT'、IR'_(Ⅲa)计算的pH结果精度较高;2)半干旱区f(5 me)与pH表现为强相关(-0.847),指示了基于5-甲基bGDGTs的指标同样具有重建半干旱区pH的潜力。但是目前缺乏CBT'_(5ME)-pH之间的转换函数;3)全球温度校正方程计算得出的温度误差普遍大于中国区域校正方程(中国北方、青藏高原等区域)获取的温度误差。通过整合数据重新计算发现4个区域温度校正方程(MBT'_(5ME)、Tmr、MAATsr、Index 1)计算的温度结果具有较小的误差,且在半干旱区重建的温度结果更为精确;另外MAATsr、Index 1的区域温度校正方程也适用于干旱区的温度重建,但是由于本文集成数据中包含的干旱区样本较少,因此在实际应用中需要谨慎。在未来的研究中需要加强干旱-半干旱区尤其是干旱区的地表过程研究,为建立该地区的温度校正方程提供更多有用的信息。 | 晁倩 赵晖 侯居峙 张帅 汪克奇 孙爱军 杨宏宇 | 2022 | 第四纪研究2022，42，2： | 0 |
| 19 | Use of brGDGTs in surface geochemical exploration for petroleum —A case study of oil and gas fields in the Jiyang depression显示文摘Branched glycerol dialkyl glycerol tetraethers(brGDGTs),likely produced by bacteria in soil and peat,are widely distributed,easily detected,newly adopted biomarker compounds.In this study,brGDGTs were used to explore the relationship between the absolute abundance of brGDGTs and the distribution of oil and gas fields in the Duoshiqiao area of the Jiyang depression.The results showed that the concentrations at the Xiakou fault and in the oil and gas fields were obviously higher than those in the contrast areas.The clear relationship among the concentration of brGDGTs,the distribution of oil and gas fields,and the acidolysis hydrocarbon(ethane)indicates that the concentration effectively responds to hydrocarbon seeps from the oil and gas field below.brGDGTs may become some of the most important indicators in surface geochemical prospecting for oil and gas. | ZHOU HaoDa HU JianFang XIONG YongQiang LIANG QianYong | 2014 | Science China Earth Sciences2014，57，7： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员