首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 31 毫秒
1.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is...  相似文献   

2.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is...  相似文献   

3.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is...  相似文献   

4.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is...  相似文献   

5.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published. The author’s affiliation is...  相似文献   

6.
Environmental Geochemistry and Health - Unfortunately, in the original publication of the article, Prof. Yong Sik Ok’s affiliation was incorrectly published.  相似文献   

7.
Studying the structure of social interactions is fundamental in behavioral ecology as social behavior often influences fitness and thus natural selection. However, social structure is often complex, and determining the most appropriate measures of variation in social behavior among individuals can be difficult. Social network analysis generates numerous, but often correlated, measures of individual connectedness derived from a network of interactions. We used measures of individual connectedness in networks of affiliative and agonistic interactions in yellow-bellied marmots, Marmota flaviventris, to first determine how variance was structured among network measures. Principal component analysis reduced our set of network measures to four “social attributes” (unweighted connectedness, affiliation strength, victimization, and bullying), which revealed differences between patterns of affiliative and agonistic interactions. We then used these extracted social attributes to examine the relationship between an individual’s social attributes and several performance measures: annual reproductive success, parasite infection, and basal stress. In male marmots, bullying was positively associated with annual reproductive success, while in females, affiliation strength was negatively associated with annual reproductive success. No other social attributes were significantly associated with any performance measures. Our study highlights the utility of considering multiple dimensions when measuring the structure and functional consequences of social behavior.  相似文献   

8.
传统的水土保持措施在坡地茶园上应用比较困难,而利用聚丙烯酰胺(PAM)来防治茶园土壤侵蚀的适宜性还有待研究。因此,在铁观音(Camellia sinensis)茶园设置6个不同PAM施用量的小区(0、2、4、6、8、10 g·m-2),并采集春、夏、秋3个收获季节的土壤和茶叶样品,通过分析茶园土壤理化性质和茶叶中丙烯酰胺残留来评价PAM对土壤理化性质和茶叶安全品质的影响。结果表明:与对照小区相比,土壤容重在低PAM施用浓度小区中发生降低,土壤有机质在不同季节的各PAM处理之间差异不显著,而土壤速效磷、碱解氮和速效钾在3个收获季节中的流失下降明显,其中施用2 g·m-2 PAM的小区其土壤速效磷、碱解氮和速效钾含量最高。每个PAM处理的茶叶样品和土壤样品中单体丙烯酰胺的残留量分别为0.011~0.095μg·L-1和0.008~0.036μg·L-1,均远低于丙烯酰胺安全限值0.5μg·L-1。文章认为红壤茶园施用PAM不仅可以保持土壤肥力,而且对茶叶生产也是安全的。施用PAM是一种适宜的防治红壤茶园土壤侵蚀的水保措施,且最佳用量为2 g·m-2。  相似文献   

9.
许妍  吴克宁 《生态环境》2011,20(11):1777-1782
"十二五"期间,我国国土资源调查评价的重点任务之一是建立农用地质量监测体系。当前我国农用地质量变化监测技术仍然处于研究探索阶段,欧盟土壤环境评价监测项目是较为成熟的监测项目,可为中国农用地质量监测工作提供借鉴。文章分别就欧盟土壤环境评价监测的相关研究和国内学者对农用地质量监测的研究进行了综述,认为欧盟土壤环境评价监测项目在指标选取、监测网络建立、数据更新技术等方面建立了较为成功的机制。未来中国农用地质量监测工作可在关注土壤环境质量、分类土壤退化原因、针对性地选取指标、应用DPSIR模型、确定监测点的方法、充分利用原有监测网络和监测数据等方面借鉴欧盟经验。  相似文献   

10.
Humic substances (HS) are widely used for diverse purposes. The effect of HS on the metal’s status in contaminated soils is contradictory. The aim of this work was to investigate the Cu migration in soils treated with HS. A model field experiment with the addition of Cu (1.243?mg?Cu/kg) and HS Extra® (potassium humate) was performed. The Cu addition resulted in acidification (by 0.7 pH) after 3 months. The major part of the added Cu remained in the upper 7-cm-thick soil layer; 4% reached the lower soil layer, while only 0.1% were removed beyond the profile. The addition of HS mitigated soil acidification increased the content of Cu bound to solid-phase organic substances and abruptly reduced the Cu activity in the soil liquid phase. Simultaneously, the HS addition increased the water-soluble organic substances (WSOS) by four times, including those in the hydrophilic and hydrophobic fractions, resulting in a twofold increase in the content of soluble Cu. Copper complexes with hydrophilic WSOS mainly reached lysimeters, and hydrophobic organic substances were absorbed by the soil. The HS addition to a slightly acidic soil can accelerate the migration of Cu to adjacent environments.  相似文献   

11.
东江流域土壤、植被和悬浮物的碳、氮同位素组成   总被引:1,自引:0,他引:1  
碳、氮同位素值对监测流域植被组成、环境变迁是一种非常有效的指标,为中短时间尺度环境变化研究提供了一条新的途径。以亚热带山区的东江流域为例,以流域内的植被、土壤及水体悬浮物为研究对象,应用其有机质同位素组成(δ13C、δ15N),揭示流域植被的成分和环境变化的信息。研究发现:东江流域土壤碳同位素、C/N比值差值不大;植被的氮同位素差值明显,C/N比值差异较大。对东江流域悬浮物δ13C值近20年的监测表明:其值在早期逐年升高,近10年来转趋稳定并呈明显下降趋势,变化范围在-17.8‰~-26.1‰之间,反映了该流域植被破坏和恢复的过程以及土壤侵蚀状况的变化趋势。  相似文献   

12.
张青  史全良 《生态环境》2010,19(12):2850-2856
采用形态鉴定及基于ITS及rbcL序列构建ML系统发育树对采自云南省姚安县及南华县的10种叶状地衣中分离纯化培养的共生藻进行分析研究。鉴定结果表明5个编号分别为Z1、Z4、Z5、Z6、Z9的树生地衣共生藻样品鉴定为念珠藻目(Nostocales)念珠藻科(Nostocaceae)念珠藻属(Nostoc);2个土生地衣共生藻样品Z2、Z10鉴定为四孢藻目(Tetrasporales)胶球藻科(Coccomyxaceae)胶球藻属(Coccomyxa);3个石生地衣分离藻样品Z3、Z7、Z8鉴定为绿球藻目(Chlorococcales)栅藻科(Scenedesmaceae)链带藻属(Desmodesmus)。另外从地衣采集地及分子系统分析结果可以看出,尽管Z1、Z5、Z9分别是从采自不同区域(姚安县及南华县)的地衣中分离纯化的,但亲缘关系最近;同样Z4、Z6亲缘关系最近;Z2、Z10亲缘关系最近,Z7、Z8亲缘关系最近。所以地衣共生菌与共生藻的共生关系与其生存的地理区域关系不大,但却和其生长基质有明显的相关性。  相似文献   

13.
Abstract: We examined the relationship between authorship and the use of biological information in recovery plans under the U.S. Endangered Species Act. Approximately one-third of recovery plans were written solely by federal government employees, and one-third of plans included authors with university affiliations. The number of plans written strictly by federal staff increased significantly over time, whereas the percentage of plans that included authors with university affiliation remained unchanged. We tested three hypotheses posed by Clark et al. (1994) regarding authorship and endangered species recovery and found that (1) groups of authors from diverse affiliations are likely to strengthen the recovery planning process, (2) recovery plans lacking nonfederal participation suffer from inadequate attention to species biology, and (3) academic affiliation is strongly associated with the use of focal-species biology in recovery plans. Our results suggest that modifying the choice of participants in the recovery planning process may increase the use of biological information in recovery measures recommended in recovery plans and thus influence the eventual success of recovery efforts.  相似文献   

14.
《毒物与环境化学》2012,94(3-6):281-299
Abstract

To investigate metal nanoparticle-induced phytotoxicity, Brassica nigra seeds were exposed to 50–1000?mg L?1 ZnO nanoparticles in culture media and 100–1000?mg kg?1 in soil. Plant length and weight were adversely affected in culture conditions, but with soil the effect was not significant. Determination of the radical-scavenging potential revealed that soil grown plants were less stressed than plants grown on culture medium. The total antioxidant and reducing power potential of soil grown plants were less variable compared to plants grown on culture medium. Total phenolic and flavonoid concentrations varied in plants, which changed with the nanoparticle’s concentrations in medium and soil. High performance liquid chromatography analysis showed that rutin was the major antioxidative molecule that significantly increased in nanoparticles-stressed B. nigra plants.  相似文献   

15.
陈琼贤  彭志平 《生态环境》2002,11(4):373-375
探讨了营养型土壤改良剂(简称改良剂)对水稻产量、土壤酸度、土壤养分、土壤肥力和土壤物理性能的效应。连续2年4造水稻试验结果表明,施用改良剂比对照稻谷产量增加8.6%~11.3%(平均10.3%),增产达极显著水平,并且有良好后效。施用土壤改良剂具有提高pH,降低活性Al,增加N、P、K有效养分和代换性K、Ca和Mg的效果。  相似文献   

16.
通过25年的长期定位试验研究不同的施肥方式对土壤有效磷与速效钾质量分数及水稻产量的影响。研究结果表明:有机肥配合施用氮、磷、钾肥能够大大提高土壤耕层有效磷的质量分数,施肥主要影响土壤耕层有效磷的质量分数,对其它土层影响不明显。有机肥配合施用氮、磷、钾肥能够提高土壤耕层速效钾的质量分数,对20~40 cm土层土壤速效钾质量分数也有提高作用。化肥配合有机肥施用稻谷的产量高于单施化肥或单施有机肥,单施化肥或单施有机肥稻谷的产量高于不施肥的对照。因此,为了提高土壤肥力与作物产量,最好的培肥方式是有机肥配施氮磷钾肥。  相似文献   

17.
Arsenic bioavailability in rock, soil and water resources is notoriously hazardous. Geogenic arsenic enters the body and adversely affects many biochemical processes in animals and humans, posing risk to public health. Chelpu is located in NE Iran, where realgar, orpiment and pyrite mineralization is the source of arsenic in the macroenvironment. Using cluster random sampling strategy eight rocks, 23 soils, 12 drinking water resources, 36 human urine and hair samples and 15 adult sheep urine and wool samples in several large-scale herds in the area were randomly taken for quantification of arsenic in rock/soil/water, wool/hair/urine. Arsenic levels in rock/soil/water and wool/hair/urine were measured using inductively coupled plasma spectroscopy and atomic absorption spectrophotometry, respectively. While arsenic levels in rocks, soils and water resources hazardously ranged 9.40–25,873.3 mg kg?1, 7.10–1448.80 mg kg?1 and 12–606 μg L?1, respectively, arsenic concentrations in humans’ hair and urine and sheep’s wool and urine varied from 0.37–1.37 μg g?1 and 9–271.4 μg L?1 and 0.3–3.11 μg g?1 and 29.1–1015 μg L?1, respectively. Local sheep and human were widely sick and slightly anemic. Hematological examination of the inhabitants revealed that geogenic arsenic could harm blood cells, potentially resulting in many other hematoimmunological disorders including cancer. The findings warn widespread exposure of animals and human in this agroecologically and geopolitically important region (i.e., its proximity with Afghanistan, Pakistan and Turkmenistan) and give a clue on how arsenic could induce infectious and non-infectious diseases in highly exposed human/animals.  相似文献   

18.
One central aspect of the environmental management system for universities developed in Osnabrück is the environmental audit of universities, realized by an ecobalance. This article deals with modelling the material and energy flows caused by the University’s commuters (staff and students), and by the business trips of employees, using the software Umberto®. The result is the University’s traffic balance. 10,000 MWh of energy are consumed yearly by the University’s traffic. 94% of the consumption is caused by commuters (1,300 employees and 11,500 students) and only 6% by business trips. Compared with the whole energy consumption of the University, the traffic’s share is 32% and therefore lies between the electricity’s share (25%) and that of heat (43%). Similarly related are the CO2 emissions, caused by traffic (3,160 tons per anno). Compared with the whole CO2 emissions of the University the traffic’s share is 31%, thus putting it between the heat’s share (27%) and that of electricity (42%). Although the average weekly distance the University’s commuters drive (79 km/student and 84 km/employer) is at the bottom of the range for other comparable universities, a transportation demand management for a further reduction of the traffic-caused CO2 emissions should be implemented.  相似文献   

19.
Sooty mangabeys are terrestrial monkeys exhibiting female philopatry and male dispersal. Studies in captivity as well as in the wild have found that adult females form linear dominance hierarchies. However, while captive studies found no evidence for a matrilineal social system, a previous study in Taï National Park, Ivory Coast, suggested that relatedness could influence both dominance rank and affiliation pattern among adult females. Here I test whether the dominance rank, coalitionary behavior, and affiliative behavior of juveniles in a group of free-ranging mangabeys in the Taï National Park are in accordance with a matrilineal, individual, or age-related dominance system. I found that juvenile females' dominance ranks remained stable over time and were highly correlated with the dominance ranks of their mothers, whereas juvenile males' dominance ranks were initially correlated with the ranks of their mothers, but showed greater instability with increasing age. Moreover, coalitions occurred mainly between juveniles and animals that were close in rank, including their mothers and siblings. Finally, juvenile females associated and groomed preferentially with close-ranking juvenile and adult females. Juvenile males showed similar preferences in affiliation with adult females, but when associating with juvenile males, they preferred peers. The observed social behavior of free-ranging juvenile sooty mangabeys resembled the social behavior described for juveniles of many matrilineal primate species.  相似文献   

20.
Stomach cancer (SC) is a severe health burden, with nearly half of the world’s cases found in China. Noticeably, the emissions of heavy metals into the environment have increased alongside rapid urbanization and industrialization in China. However, as regards carcinogenic associations, the relationship between heavy metals and SC is yet unclear. Based on 9378 newly diagnosed SC cases in Hangzhou City from 2009 to 2012, this work is concerned with the quantitative characterization of the spatial distribution pattern of SC incidence and its geographical association with soil heavy metals by means of a novel geographical model. The results show that (a) Cd is one of the severe soil pollutants in Hangzhou; (b) higher SC incidence clusters are in central Hangzhou, whereas lower clusters are found in the northeast and southwest with a male to female incidence ratio about 2.2:1; (c) although when considered separately, the heavy metals in this work do not have a considerable impact on the distribution of SC incidence in Hangzhou City, nevertheless, the joint effects of multiple heavy metals have significant impacts on SC risk. The present work calls for a rigorous quantitative assessment of the integrated heavy metal soil pollution and its effects on SC incidence.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号