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1.
《干旱区研究》2018,(2)
2013年5—8月按照GB13580.2-92规定的大气降水采样方法,采集了东天山喀尔力克山南坡榆树沟流域32场降水,进行了p H、EC及离子组成的测定,并运用综合描述法、相关性分析、气团来源轨迹、富集因子及端源贡献法探究其来源。结果表明:榆树沟流域夏季降水的p H平均值为6.8,呈弱酸性;电导率在3.79~239μs·cm~(-1),受降水量影响明显;阴阳离子质量浓度的平均值分别是SO_4~(2-)NO_3~-Cl~-F~-和Ca~(2+)NH_4~+Na~+K~+Mg~(2+);SO_4~(2-)、NO_3~-、F~-和NH_4~+主要来自于人类活动;Cl~-基本来自海盐源,受地壳源的影响甚微;Na~+的来源受海盐源和陆源共同影响;Ca~(2+)和K~+来自于非海盐源的贡献。 相似文献
2.
玛纳斯河流域绿洲土壤春季盐渍化研究 总被引：1，自引：0，他引：1
运用经典统计学和冗余分析方法,对玛纳斯河流域绿洲土壤全盐量（TS）、pH、电导率（EC）、钠吸附比（SAR）和盐分离子组成的空间分布特征进行了分析。结果表明：土壤全盐量呈现明显的底聚特征,各层土壤全盐量均值在5.80~9.02 g•kg-1,表现为轻度至中度盐化;各层土壤中,pH在8.2~8.4、EC在0.70~1.38 mS•cm-1、SAR在0.25~0.64,未出现碱化现象。冗余分析表明：不同层次土壤中,Ca 2+与SO 42-、Na+与SO42-保持较好的关联性。TS的空间分布,在 0 ~70 cm 全剖面上主要受控于Na+、SO42-、Ca 2+和Mg 2+;分层与全剖面的情况略有不同,但Na+、SO42-在各个土层仍为最主要的控制离子。EC在全剖面上的空间分布受控于 Na+、SO42-;50 ~70 cm 土层主要受Na+与Cl-的控制,其他土层与全剖面相同。 pH受控于CO32-;除0~10 cm土层受HCO-3影响外,其他土层与全剖面相同。SAR在全剖面的空间分布受环境因子的影响较小,除50~70 cm土层受Cl-因子的制约外,0~50 cm土层未表现出明显的控制因子。 相似文献
3.
为了评价塔克拉玛干沙漠腹地达理雅博依绿洲地下水水化学特征与演化规律及对当地生态环境的影响。在研究区的生态井位观测点采集了19组地下水样品进行检测。综合运用数理统计、相关性分析、Piper三线图、Gibbs模型、Schoeller图和离子比等方法,分析地下水水化学特征和克里雅河尾闾绿洲的水化学演化规律。研究表明:研究区地下水阳离子以Na+、Mg+离子为主,阴离子以Cl-、SO42-,为主,Mg+、Cl-、SO42-表现为强变异性,K+、Ca+、Na+、HCO-3表现为中等变异;TDS介于1000mg/L-18620mg/L范围内,平均值为4366.408mg/L,矿化度较高;水化学类型以Cl--Na+为主;地下水样品主要分布于Gibbs图的右上部分,表明研究区地下水主要受蒸发浓缩作用控制,岩石风化和大气降水影响较小;主要离子比表明碳酸盐、蒸发岩和硅酸盐是离子的主要来源,且处于沙漠腹地的独特地理因素,地下水中的离子交换作用较弱。 相似文献
4.
乌鲁木齐大气总悬浮颗粒物（TSP）离子化学组分及影响因素 总被引：1，自引：0，他引：1
利用2009年乌鲁木齐4个大气总悬浮颗粒物（TSP）观测站点资料,采用离子色谱仪分析了TSP中水溶性离子成分。结果表明：① 2009年乌鲁木齐市区3站总离子浓度为151.28 μg/m3,白杨沟为40.83 μg/m3。4站NO3-/SO42-比值较小,表明乌鲁木齐大气污染主要来自于固定污染源。② 2009年乌鲁木齐4站TSP中SO42-、Ca2+、NO3-和NH4+的浓度高于其他各离子,各站离子浓度有明显的季节变化特征,采暖期各离子浓度明显增加,SO42-、NO3-增幅最大。③ 对各主要离子进行相关性分析,得到NH4+与SO42-的相关系数为0.828,与NO3-的相关系数为0.659,说明铵盐化合物主要以硫酸铵和硝酸铵的形式存在;SO42-与NO3-的相关性很大,相关系数为0.973,表明二者主要来自二氧化硫和氮氧化物,排放方式与在大气中的传输途径较一致;地壳元素Ca2+和Mg2+有很好的相关性,相关系数是0.914,表明二者来源相似,可能主要来自风沙土壤尘、道路尘和建筑尘。 相似文献
5.
为探究易贡湖流域地表水水化学特征及其控制因素,以藏东南易贡湖流域为研究对象,采集了26组地表水样,绘制了水样点主要离子线性变化趋势图、Gibbs图及Piper三线图等,运用相关分析、线性趋势分析、数理统计和离子比等方法。分析了研究区地表水主要离子特征及其控制因素,揭示了研究区地表水水中的主要物质来源。结果显示：易贡湖流域地表水阳离子主要为Ca2+、Mg2+,K+和Na+含量较低,4种阳离子的含量关系为：Ca2+>Mg2+>Na+>K+,阴离子主要为HCO3-、SO42-和Cl-,NO3-和F-含量较低,阴离子含量关系为：HCO3->SO42-... 相似文献
6.
为探究新疆昌吉州东部平原区地下水水质演化过程，采用数理统计、Piper三线图、Gibbs图和离子比法对昌吉州东部平原区2016年63组地下水水质取样点及54组2012—2015年地下水水质监测数据进行分析。结果表明：昌吉州东部平原区2012年地下水阳离子平均含量总体为Ca2+>K++Na+>Mg2+，阴离子平均含量总体为HCO3->SO42->Cl-；从2013年开始，SO42-逐渐增大，Ca2+逐渐减小；到2016年阳离子平均含量总体为Ca2+>K++Na+>Mg2+，阴离子平均含量总体为HCO3->SO42->Cl-。水化学类型由2012年HCO3—Ca·Mg（Ca·Na、Ca·Na·Mg）型向2016年HCO3·SO4—Ca·Na·Mg（Ca·Mg、Ca·Na）演化，这主要与含水介质的风化作用和蒸发浓缩作用有关，而蒸发浓缩作用更加体现在承压水区的上部潜水中。地下水中Na+、K+、Cl-主要来自岩盐的溶解；Ca2+、Mg2+主要来自蒸发岩溶解；SO42-主要来自石膏（CaSO4·2H2O）和芒硝（Na2SO4·10H2O）的溶解。Cl-、SO42-除来自岩盐的溶解外，还受到人类活动的影响。 相似文献
7.
蒙琪 《干旱区资源与环境》2021,35(3):80-87
为系统研究石羊河流域中下游浅层地下水水化学特征及主要离子来源,于2018年6-8月采集地下水水化学样品62组。综合运用数理统计、Gibbs图、离子比例关系和水文地球化学模拟等方法,分析了石羊河流域中下游浅层地下水的水文地球化学特征,探讨了水化学演化过程及主要离子来源。结果表明:研究区浅层地下水在水平方向上呈现明显的水化学分带,从中游至下游地下水水化学类型由SO4·HCO3-Na·Ca型过渡为SO4·Cl-Na·Mg型,TDS含量也随之升高,流域中游为TDS含量小于1g/L的淡水,至下游演化为TDS含量高于1g/L的微咸水和咸水。该区浅层地下水水化学组分主要受水岩作用和蒸发浓缩作用控制,Ca2+、Mg2+主要来源于硅酸盐岩和碳酸盐岩的溶解,碳酸盐岩以白云石风化溶解为主,部分水样点存在方解石的风化溶解,阳离子交换作用是影响研究区地下水化学组分的重要过程。模拟结果表明沿地下水流向,地下水离子组分浓度呈递增趋势,岩盐、白云石和石膏发生溶解,方解石沉淀;从中游到下游地下水中阳离子交换作用越来越强烈,且阳离子交换作用强于溶解沉淀作用。 相似文献
8.
为探究新疆伊犁河谷西北部地下水化学特征及成因,运用数理统计以及Piper三线图、Gibbs图、离子比图等方法,对2018年伊犁河谷西北部地下水取样监测数据进行分析。结果表明:(1)研究区地下水属于总硬度偏高的弱碱性水,地下水化学组分含量整体变异性不大,主要阳离子为Ca2+,主要阴离子为HCO3-。(2)地下水水化学类型以HCO3-Ca、HCO3·SO4-Ca、HCO3·SO4-Ca·Mg、HCO3·SO4-Ca·Na和HCO3-Ca·Mg型为主。(3)研究区地下水化学组分主要受岩石溶滤作用控制,蒸发-浓缩作用及阳离子交换作用对地下水化学组分有一定的贡献,个别地下水水样点可能受到人为活动的影响。(4)地下水中的Na+、Cl-和SO42-主要来自岩盐、石膏等蒸发岩的溶解,Ca2+和Mg2+主要来自方解石、白云石和石膏等矿物溶解。 相似文献
9.
塔里木河流域水化学组成分布特征 总被引：4，自引：0，他引：4
于2010年6月对塔里木河干流及主要支流地表水进行水化学采样,共设25个点采集50个样品。分析表明：塔里木河干流水体中阳离子Na++K+＞Ca2+＞Mg2+,与南北侧支流Na++K+＞Mg2+＞Ca2+存在显著差异,但均以Na++K+为主,阳离子浓度分别占干流、南北侧支流的68.6%、62.6%和62.5%。与1965年对应采样点同月份水化学成分相比,塔里木河流域主要可溶性离子浓度增幅较大,整体平均增加8.0倍,尤其是Cl-达21.7倍,这可能是近年来塔里木河流域气温上升降水增加等自然因素,间接促进降水过程中水化学侵蚀地表可溶性物质所致。同时,流域内工农业快速发展,生活污水、工农业废水大量排放到塔里木河,这可能是影响塔里木河水质变化的重要因素之一。 相似文献
10.
11.
Zongjie LI 《干旱区科学》2017,9(6):911-923
Precipitation chemistry analysis is essential to evaluate the atmospheric environmental quality and identify the sources of atmospheric pollutants. In this study, we collected a total of 480 precipitation samples at 6 sampling sites in the northern and southern slopes of Wushaoling Mountain from May 2013 to July 2014 to analyze the chemical characteristics of precipitation and to identify the main sources of ions in precipitation. Furthermore, we also explored the indicative significance for sand dust events in the northern and southern slopes of Wushaoling Mountain based on the precipitation chemistry analysis.During the sampling period(from May 2013 to July 2014), the p H values, EC(electrical conductivity)values and concentrations of cations(Ca~(2+), Mg~(2+), Na~+, K~+ and NH_4~+) and anions(SO_4~(2–), NO_3~–, Cl~–, NO_2~– and F~–) in precipitation were different in the northern and southern slopes at daily and seasonal time scales, with most of the values being higher in the northern slope than in the southern slope. The chemical type of precipitation in the southern and northern slopes was the same, i.e.,SO_4~(2–)-Ca~(2+)-NO_3~–-Na~+. The concentrations of ions in precipitation were mainly controlled by terrigenous material and anthropogenic activities(with an exception of Cl~–). The concentration of Cl~– in precipitation was mainly controlled by the sea salt fraction. The concentrations of Na+ and Cl~– showed an increasing trend after the occurrence of sand dust events both in the northern and southern slopes. In addition, after the occurrence of sand dust events, the concentrations of K~+, Mg~(2+), SO_4~(2–), NO_3~– and Ca~(2+) showed an increasing trend in the southern slope and a decreasing trend in the northern slope. It is our hope that the results may be helpful to further understand the atmospheric pollution caused by sand dust events in the Wushaoling Mountain and can also provide a scientific basis for the effective prevention of atmospheric pollution. 相似文献
12.
LIU Jieyun 《干旱区科学》2016,8(6):910-920
With rapid economic growth in China,anthropogenic reactive nitrogen(Nr) emissions have more than doubled over the last two or three decades.Atmospheric Nr pollution is an environmental concern in China especially in megacities such as Beijing.In order to identify the impact of emission sources on atmospheric Nr pollution,we measured atmospheric Nr concentrations and their isotopic composition(δ~(15)N) dynamics at three typical sites:landfill,pig farm and road traffic sites in Beijing from April 2010 to March 2011.Passive samplers were used for monitoring ammonia(NH_3) and nitrogen dioxide(NO_2),two major Nr species,while their δ~(15)N values were measured by a diffusion method combined with mass spectrometer approach.The raw water pool of the landfill and fattening house of the pig farm were important NH_3 sources with mean NH_3 concentrations being 2,829 and 2,369 μg/m~3,respectively,while the road traffic site was a minor NH_3 source(10.6 μg/m~3).NH_3 concentrations at sites besides the landfill and roads were high in summer and low in winter due to the annual variation of temperature and the change of emission source intensity.In contrast,the NH_3 concentrations inside the pig farm house were high in winter and low in summer,for the barn windows were open in summer and closed in winter.The mean NO_2 concentrations were 89.8,32.9 and 23.0 μg/m~3 at the road traffic,the landfill and pig farm sites,respectively.Due to vehicle fuel combustion,NO_2 concentration at the road traffic was the highest among the three sources,and the road traffic was a main NO_2 emission source.PM10,p NH4+ and p NO3– concentrations in particulate matter were higher in summer than in winter(except PM10 for the pig farm).The δ~(15)NH_3 values ranged from –19.14‰ to 7.82‰,with an average of –0.05‰ for the landfill site,and the lowest values were observed in June and July.The δ~(15)NH_3 values for the pig farm site ranged from –29.78‰ to –14.05‰ with an average of –24.51‰,and the δ~(15)NH_3 values were more negative in summer than in the other seasons.The δ~(15)NO_2 values were –9.63‰ to 7.04‰ with an average of –3.72‰ for the road traffic site.The δ~(15)NO_2 values were more negative in summer than those in the other seasons.The different δ~(15)N values for the various Nr species in different sources may serve as important indicators for identifying atmospheric Nr sources in megacities.The results may also provide the theoretical basis for research on the atmospheric N deposition and its sources. 相似文献
13.
YANG Xiaoju 《干旱区科学》2022,14(12):1395-1412
Atmospheric particle pollution is one of the major factors leading to degradation of ancient wall paintings, particularly heritage sites in arid and semi-arid regions. However, current systematic research on the changes, sources, and influential factors of atmospheric particulate matter and its water-soluble ion concentrations is not sufficient. Thus, the major water-soluble ion concentrations, sources, and influential factors of atmospheric particles PM2.5 and PM10 (particulate matter with an aerodynamic equivalent diameter ≤2.5 and 10.0 μm, respectively, in ambient air) were collected from Cave 16 and its ambient exterior environment in the Dunhuang Mogao Grottoes, China, between April 2015 and March 2016. Results showed that the concentrations of PM2.5 and PM10 inside and outside the cave were the highest in March 2016 and the lowest in December 2015. The higher particle concentration from March to May was related to the frequent occurrence of sand and dust events, and the lower particle concentration from June to September was associated with good diffusion conditions, increased precipitation, and an established cave shelterbelt. The concentration of particulate matter inside the cave was affected by the concentration of particles in the air outside the cave. Ca2+, NH+ 4, Na+, Cl-, and SO2- 4were the main components of the total ions of PM2.5 and PM10 both inside and outside the cave. The total ions inside the cave were frequently affected by the disturbance of tourists' activities during the peak tourist season from May to August. Under the influence of dust, the total concentrations of Cl-, SO2- 4, Na+, NH+ 4, and Ca2+ in particles of different sizes inside and outside the cave increased, and the concentrations of Cl-, SO2- 4, Na+, and Ca2+ decreased during precipitation period. Backward air mass trajectory analysis suggested that the pollutants were mainly from Xinjiang, China. The pollutant sources of air particulates are straw burning, secondary pollution sources, soil dust, dry spring rivers, and tourist activities. 相似文献
14.
Groundwater plays a dominant role in the eco-environmental protection of arid and semi-arid regions.Understanding the sources and mechanisms of groundwater recharge,the interactions between groundwater and surface water and the hydrogeochemical evolution and transport processes of groundwater in the Longdong Loess Basin,Northwest China,is of importance for water resources management in this ecologically sensitive area.In this study,71 groundwater samples(mainly distributed at the Dongzhi Tableland and along the Malian River)and 8 surface water samples from the Malian River were collected,and analysis of the aquifer system and hydrological conditions,together with hydrogeochemical and isotopic techniques were used to investigate groundwater sources,residence time and their associated recharge processes.Results show that the middle and lower reaches of the Malian River receive water mainly from groundwater discharge on both sides of valley,while the source of the Malian River mainly comes from local precipitation.Groundwater of the Dongzhi Tableland is of a HCO3-Ca-Na type with low salinity.The reverse hydrogeochemical simulation suggests that the dissolution of carbonate minerals and cation exchange between Ca2+,Mg2+and Na+are the main water-rock interactions in the groundwater system of the Dongzhi Tableland.Theδ18O(from-11.70‰to-8.52‰)andδ2H(from-86.15‰to-65.75‰)values of groundwater are lower than the annual weighted average value of precipitation but closer to summer-autumn precipitation and soil water in the unsaturated zone,suggesting that possible recharge comes from the summer-autumn monsoonal heavy precipitation in the recent past(≤220 a).The corrected 14C ages of groundwater range from 3,000 to 25,000 a old,indicating that groundwater was mainly from precipitation during the humid and cold Late Pleistocene and Holocene periods.Groundwater flows deeper from the groundwater table and from the center to the east,south and west of the Dongzhi Tableland with estimated migration rate of 1.29-1.43 m/a.The oldest groundwater in the Quaternary Loess Aquifer in the Dongzhi Tableland is approximately 32,000 a old with poor renewability.Based on theδ18O temperature indicator of groundwater,we speculate that temperature of the Last Glacial Maximum in the Longdong Loess Basin was 2.4℃-6.0℃ colder than the present.The results could provide us the valuable information on groundwater recharge and evolution under thick loess layer,which would be significative for the scientific water resources management in semi-arid regions. 相似文献
15.
Yibo ZHANG 《干旱区科学》2017,9(6):810-822
Due to increasing global demand for crop production and energy use, more and more reactive nitrogen(Nr) has been generated and emitted to the environment. As a result, global atmospheric nitrogen(N) deposition has tripled since the industrial revolution and the ecological environment and human health have been harmed. In this study, we measured dry and wet/bulk N deposition from July 2013 to December 2015 in a semi-arid grassland of Duolun County, Inner Mongolia, China. The samples of dry and wet/bulk N deposition were collected monthly with a DELTA(DEnuder for Long Term Atmospheric sampling) system and with Gradko passive samplers and a precipitation gauge. The measured results show that the annual mean concentrations of NH_3, NO_2, HNO_3, particulate NH_4~+(pNH_4~+) and particulate NO_3~-(pNO_3~-) in atmosphere were 2.33, 1.90, 0.18, 1.42 and 0.42 μg N/m3, respectively, and that the annual mean volume-weighted concentrations of NH_4~+-N and NO_3~--N in precipitation were 2.71 and 1.99 mg N/L, respectively. The concentrations of Nr components(including NH_3, NO_2, HNO_3, p NH_4~+, pNO_3~-, NH_4~+-N and NO_3~--N) exhibited different seasonal variations. Specifically, NO_2 and HNO_3 exhibited higher concentrations in autumn than in summer, while the other Nr components(NH_3, pNH_4~+, pNO_3~-, NH_4~+-N and NO_3~--N) showed the highest values in summer. Based on measured concentrations of Nr components and their deposition velocities estimated using the GEOS-Chem global atmospheric chemical transport model, the calculated annual mean dry deposition fluxes were 3.17, 1.13, 0.63, 0.91 and 0.36 kg N/(hm~2·a) for NH_3, NO_2, HNO_3, p NH_4~+ and pNO_3~-, respectively, and the calculated annual mean wet/bulk deposition fluxes were 5.37 and 3.15 kg N/(hm~2·a) for NH_4~+-N and NO_3~--N, respectively. The estimated annual N deposition(including dry N deposition and wet/bulk N deposition) reached 14.7 kg N/(hm~2·a) in grassland of Duolun County, approaching to the upper limit of the N critical load(10–15 kg N/(hm~2·a)). Dry and wet/bulk deposition fluxes of all Nr components(with an exception of HNO_3) showed similar seasonal variations with the maximum deposition flux in summer and the minimum in winter. Reduced Nr components(e.g., gaseous NH_3 and p NH_4~+ in atmosphere and NH_4~+-N in precipitation) dominated the total N deposition at the sampling site(accounted for 64% of the total N deposition), suggesting that the deposited atmospheric Nr mainly originated from agricultural activities. Considering the projected future increases in crop and livestock production in Inner Mongolia, the ecological and human risks to the negative effects of increased N deposition could be increased if no mitigation measures are taken. 相似文献
16.
水稻稻瘟病反应型和产孢量关系初探 总被引：3，自引：1，他引：3
利用6个水稻品种:丽江新团黑谷、中作93、中华9号、新2号、京越、黎明和3个稻瘟病菌种北-1、中2-1、稻72和已知比例的混合小种(北-1:中2-1=1:1)共24个品种-小种组合,采取分小种接种方法,研究了水稻叶瘟病反应型(产孢面积)与产孢量之间的关系,组建了产孢面积-产孢量模型y=exp (1.46lnx-4.64),在此基础上估测了反应型权重值。 相似文献
17.
生防芽孢杆菌T2胞外蛋白酶的纯化及其抗真菌作用 总被引：5，自引：0，他引：5
从小麦根际土壤中分离到一株高产蛋白酶并对棉花枯萎病菌(Fusarium oxysporum f sp.vasinfectum)具有拮抗作用的枯草芽孢杆菌(Bacillus subtilis)T2。采用硫酸铵分级沉淀、DEAE Sepharose Fast Flow、SP Sepharose Fast Flow离子交换层析、Sephadex G-75凝胶过滤层析,从T2发酵液中分离纯化出一种分子量约为29.0kD的蛋白酶。该酶作用的最适温度为65℃,最适pH为8.0,在低于50℃、pH5.0-7.5范围内较稳定。Na+、K+Pb2+、EDTA对酶有激活作用,Ca2+、Ba2+、Al3+、Zn2+、Mn2+、Hg2+、SDS对酶有部分抑制作用,而PMSF可完全抑制酶活,推测该酶是一种丝氨酸蛋白酶。抗菌活性显示,该酶对棉花枯萎病菌的孢子萌发、菌丝生长有明显抑制作用。 相似文献
18.
SHAN Junjie WANG Jianping SHAN Fashou TENG Xueming FAN Qishun LIQingkuan QIN Zhanjie ZHANG Xiangru 《干旱区科学》2020,12(2):331-348
It is widely accepted that hydrogeochemistry of saline springs is extremely important to understand the water circulation and evolution of saline basins and to evaluate the potential of potassium-rich evaporites.The Kuqa Basin,located in the northern part of the Tarim Basin in Northwest China,is a saline basin regarded as the most potential potash-seeking area.However,the origin and water circulation processes of saline springs have yet to be fully characterized in this saline basin.In this study,a total of 30 saline spring samples and 11 river water samples were collected from the Qiulitage Structural Belt(QSB)of the Kuqa Basin.They were analyzed for major(K^+,Ca2^+,Na^+,Mg2^+,SO42-,Cl-and HCO3-)and trace(Sr2^+and Br-)ion concentrations,stable H-O-Sr isotopes and tritium concentrations in combination with previously published hydrogeochemical and isotopic(H-O)data in the same area.It is found that the water chemical type of saline springs in the study area belonged to the Na-Cl type,and that of river water belonged to the Ca-Mg-HCO3-SO4 type.The total dissolved solid(TDS)of saline springs in the QSB ranged from 117.77 to 314.92 g/L,reaching the brine level.On the basis of the general chemical compositions and the characteristics of the stable H-O-Sr isotopes of saline springs,we infer that those saline springs mainly originated from precipitation following river water recharging.In addition,we found that saline springs were not formed by evapo-concentration because it is unlikely that the high chloride concentration of saline springs resulted in evapo-concentration and high salinity.Therefore,we conclude that saline spring water may have experienced intense evapo-concentration before dissolving the salty minerals or after returning to the surface.The results show that the origin of salinity was mainly dominated by dissolving salty minerals due to the river water and/or precipitation that passed through the halite-rich stratum.Moreover,there are two possible origins of saline springs in the QSB:one is the infiltration of the meteoric water(river water),which then circulates deep into the earth,wherein it dissolves salty minerals,travels along the fault and returns to the surface;another is the mixture of formation water,or the mixture of seawater or marine evaporate sources and its subsequent discharge to the surface under fault conditions.Our findings provide new insight into the possible saltwater circulation and evolution of saline basins in the Tarim Basin. 相似文献
19.
1961-2017年柴达木盆地干湿状况及其影响因子 总被引：1，自引：0，他引：1
根据1961—2017年柴达木盆地8个气象站数据资料,采用联合国粮农组织FAO推荐的Penman-Monteith模型计算潜在蒸散量,继而算得湿润指数,辅以气候倾向率、M-K检验、Morlet小波周期和主成分分析等方法,探究柴达木盆地干湿变化特征及影响因素。结果表明:1961—2017年,柴达木盆地整体具有变湿趋势,变化倾向率为0.007·(10a)~(-1)(α≥0.001),且湿润指数年际变化波动较大,变异系数为30.73%,春、夏、秋、冬四季湿润指数均呈上升趋势,倾向率分别为0.003·(10a)~(-1)、0.009·(10a)~(-1)、0.004·(10a)~(-1)、0.003·(10a)~(-1);空间变化差异显著,盆地东部地区变湿趋势大于西部,德令哈和都兰变湿趋势最为显著;湿润指数在1981年和1986年发生突变,且存在2.8 a和3.6 a(α≥0.05)的变化周期,与大气环流2～4 a周期较吻合;主成分分析表明,降水量和平均气温是柴达木盆地湿润指数的主要影响因子。此外,湿润指数与北半球极涡面积和强度及亚洲区极涡面积和强度关系密切,相关系数分别为-0.46、-0.36、-0.49、-0.47,均通过99%的显著性检验。 相似文献