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991.
992.
土壤氮、盐浓度对盐角草(Salicornia europaea)生长发育及氮素吸收的影响 总被引:1,自引:0,他引:1
以盐生植物盐角草(Salicornia europaea)为材料,以NaCl模拟不同盐度环境,盆栽试验了氮(0.3g·kg-1,N1;0.6g·kg-1,N2;1.2g·kg-1,N3;2.4g·kg-1,N4)、盐(2.5g·kg-1,S1;5.0g·kg-1,S2;7.5g·kg-1,S3)处理对其生长发育及氮素吸收利用的影响。结果表明:(1)不同盐度下施氮均可以显著促进盐角草的生长,地上部干质量均在N2处理下达到最大,而株高均在N1时达到最高,且施氮对盐角草生长的影响与盐度有关;(2)不同盐度环境下施氮所能达到的最高干物质产量及最高施氮限量不同,表现为S3S1S2,随着施氮量的增加,氮素生产力与氮素农学利用效率均表现出下降的趋势;(3)施氮显著增加了盐角草各器官含氮量及氮吸收量,同一施氮水平下盐角草各器官含氮量及氮吸收量均表现为同化枝茎根;(4)同一施氮水平下,随着盐度的增加,盐角草同化枝渗透势显著下降,同一盐度环境下,随着施氮量的增加,同化枝渗透势呈现出下降趋势,渗透调节能力增大;(5)3个盐度环境下,施氮均增加盐角草同化枝光合色素含量,从而提高光合效率,增强其对盐渍环境的适应能力。 相似文献
993.
针对南极普里兹湾内达恩利角附近海域的3个测站共12份海水样品,采用寡营养培养基分离培养极地浮游细菌,通过PCR方法获取其中95株细菌的16S rRNA基因序列。序列分析结果表明,分离获得的95株细菌分属α-变形杆菌纲(Alphaproteobactia)、γ-变形杆菌纲(Gammaproteobacteria)和拟杆菌门(Bacteroidetes)3个类群下的35个不同分类单元,其中α-变形杆菌纲为优势细菌,在不同水层中所占的比例为52.6%—62.5%。通过Shannon多样性指数分析发现,南极普里兹湾陆架区测站P2-14多样性指数较陆坡区两测站P2-11和P2-8的高,细菌多样性与浮游植物量和生产力水平呈现正相关。表层细菌Shannon多样性指数最低,50 m水层最高,100和200 m水层多样性指数变化不明显,真光层水体中细菌垂直分布与营养盐和溶解氧浓度存在关联。此外,采用寡营养陈海水培养基,还获得了一些与已报道的16S rRNA基因序列相似性较低的菌株,它们代表了微生物新物种,可能也是南极真光层特有的细菌。研究工作表明,南极普里兹湾真光层水体中蕴藏着丰富的浮游细菌资源,它们有待保护、开发和利用。 相似文献
994.
995.
Accurate rainfall distribution is difficult to acquire based on limited meteorological stations, especially in remote areas like high mountains and deserts. The Hexi Corridor and its adjacent regions (including the Qilian Mountains and the Alxa Plateau) are typical districts where there are only 30 available rain gauges. Tropical Rainfall Measuring Mission (TRMM) data provide a possible solution. After precision analysis of monthly 0.25 degree resolution TRMM 3B43 data from 1998 to 2012, we find that the correlations between TRMM 3B43 estimates and rain gauge precipitation are significant overall and in each station around the Hexi Corridor; however, the biases of annual precipitation differ in different stations and are seriously overestimated in most of the sites. Thus, Inverse Distance Weighting (IDW) interpolation method was used to rectify TRMM data based on the difference between TRMM 3B43 estimates and rain gauge observations. The results show that rectified TRMM data present more details than rain gauges in remote areas where there are few stations, alt- hough they show high coherence of distribution. Precipitation decreases from southeast to northwest on an annual and seasonal scale. There are three rainfall centers (〉500 mm) including Menyuan, Qilian and Toson Lake, and two low rain- fall centers (〈50 mm) including Dunhuang and Ejin Banner. Meanwhile, precipitation in most of the study area presents an increasing trend; especially in northern Qilian Mountains (〉5 mm/a), Badain Jaran Desert (〉2 mm/a), Toson Lake (〉20 mm/a) and Qingtu Lake (〉20 ram/a) which shows a significant increasing trend, while precipitation in Hala Lake (〈-2 mm/a) and Tengger Desert (〈-3 mm/a) demonstrates a decreasing trend. 相似文献
996.
997.
A South China Sea (SCS) local TC (SLT) is defined as a tropical cyclone (TC) that forms within the SCS region and can reach the grade of tropical storm (TS) or above. The statistical features of the SLTs from 1985 to 2007 are analyzed first. It is found that over the SCS about 68% of the TCs can develop into TSs. The SLT intensity is relatively weak and associated with its genesis latitude as well as its track. The SLT monthly number presents a seasonal variation with two peaks in May and July to September. Based on the daily heat flux data from the Woods Hole Oceanographic Institution_Objectively Analyzed air-sea Fluxes (WHOI_OAFlux) in the same period, the air-sea exchange during the process of generation and development of the SLT is studied. Results show that the heat fluxes released to the atmosphere increase significantly day by day before cyclogenesis. The ocean to the south to the TC center provides the main energy. Along with the development of SLT, the regions with large heat fluxes spread clockwise to the north of TC, which reflects the energy dispersion property of vortex Rossby waves in the periphery of the TC. Once the SLT forms the heat fluxes are not intensified as much. During the whole process, the net heat, latent heat and sensible heat flux display a similar evolution, while the latent heat flux makes a main contribution to the net heat flux. The maximum air-sea heat exchange always occurs at the left side of the TC moving direction, which may reflect the influence of the SCS summer monsoon on TC structure. 相似文献
998.
Based on composite analysis and numerical simulations using a regional climate model (RegCM3), this paper analyzed the impact of the LHF anomaly in the tropical western Pacific on the precipitation over the south of China in June. The results are as follows. (1) Correlation analysis shows that the SC precipitation in June is negatively correlated with the LHF of the tropical western Pacific in May and June, especially in May. The SC precipitation in June appears to negatively correlate with low-level relative vorticity in the abnormal area of LHF in the tropical western Pacific. (2) The LHF anomaly in the tropical western Pacific is a vital factor affecting the flood and drought of SC in June. A conceptual model goes like this: When the LHF in the tropical western Pacific is abnormally increased (decreased), an anomalous cyclone (anticyclone) circulation is formed at the low-level troposphere to its northwest. As a result, an anomalous northeast (southwest) air flow affects the south of China, being disadvantageous (advantageous) to the transportation of water vapor to the region. Meanwhile, there is an anomalous anticyclone (cyclone) at the low-level troposphere and an anomalous cyclone (anticyclone) circulation at the high-level troposphere in the region, which is advantageous for downdraft (updraft) there. Therefore a virtual circulation forms updraft (downdraft) in the anomalous area of LHF and downdraft (updraft) in the south of China, which finally leads to the drought (flood) in the region. 相似文献
999.
QuikSCAT卫星散射计矢量风检验及南海月平均风场特征分析 总被引:4,自引:1,他引:3
采用中国科学院南海海洋研究所2008年建设的,西沙海洋观测研究站上的自动气象站实测数据,对亚太数据研究中心提供的近实时QuikSCAT卫星遥感风场资料(2008年4月6日—12月31日)进行了检验和统计特征分析,得出:这两者风速的相关系数为0.86,平均偏差为-1.50 m/s,均方根误差为1.71 m/s,表明QuikSCAT卫星遥感风场资料在南海具有很高的适用性。在此基础上,利用QuikSCAT卫星遥感的月平均风场资料分析了南海月平均风场特征。结果表明:(1)南海季风10月到次年3月盛行东北风,6—8月盛行西南风,4、5、9月为季风转换季节;(2)存在两个平均风速大值中心,一个位于南海南部(10°N,108°E)附近,另一个位于台湾海峡附近,其位置和强度会随着季节变化而变动。 相似文献
1000.