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排序方式: 共有233条查询结果,搜索用时 31 毫秒
151.
Xu Chen Yang Guishan Wan Rongrong Ou Weixin Wang Peng 《Environmental science and pollution research international》2021,28(30):40178-40191
Environmental Science and Pollution Research - Faced with huge environmental problems of ecosystem degradation, “Ecological Redline Policy (ERP)” in China is a new key national-level... 相似文献
152.
Deng Zhongci Kang Ping Wang Zhen Zhang Xiaoling Li Weijie Ou Yihan Lei Yu Dang Ying Deng Zhongren 《Environmental science and pollution research international》2021,28(3):2914-2922
Environmental Science and Pollution Research - Urbanization in China has dramatically increased from 39.10 in 2002 to 58.52% in 2017. Studies have discussed the impacts of urbanization and its... 相似文献
153.
不同生育期Cd胁迫对水稻生长及镉累积的影响 总被引:7,自引:0,他引:7
采用水培试验方法,从水稻移栽至某特定生育期之间添加外源镉(Cd),通过递推减法,研究了湘晚籼13号水稻不同生育期Cd胁迫对其生长和不同部位中Cd含量的影响.结果表明,50μg·L~(-1)外源Cd胁迫不会影响水稻的正常生长发育,糙米中的Cd主要来源于水稻分蘖期吸收的Cd在后期的迁移、灌浆期吸收的Cd和成熟期吸收的Cd,这3个关键生育期对糙米中最终Cd含量的贡献率分别为36.4%、18.2%和16.4%.因此,与灌浆期和成熟期相比,在水稻分蘖期采用一些植物阻隔技术可能对水稻籽粒中Cd含量的削减更为重要. 相似文献
154.
YOAN PAILLET LAURENT BERGÈS JOAKIM HJÄLTÉN PÉTER ÓDOR CATHERINE AVON MARKUS BERNHARDT‐RÖMERMANN RIENK‐JAN BIJLSMA LUC DE BRUYN MARC FUHR ULF GRANDIN ROBERT KANKA LARS LUNDIN SANDRA LUQUE TIBOR MAGURA SILVIA MATESANZ ILONA MÉSZÁROS M.‐TERESA SEBASTIÀ WOLFGANG SCHMIDT TIBOR STANDOVÁR BÉLA TÓTHMÉRÉSZ ANNELI UOTILA FERNANDO VALLADARES KAI VELLAK RISTO VIRTANEN 《Conservation biology》2010,24(4):1157-1160
155.
156.
Chunyan Yu Xie Quan Xiaoxia Ou Shuo Chen 《Frontiers of Environmental Science & Engineering》2008,2(3):291-296
Four fractions (A, B, C, and D) of humic acids (HAs) were separated based on the polarity from weak to strong. UV-vis absorption and Fourier transform infrared spectroscopy (FTIR) analysis show that the fractions C and Dpossessedmore aromatic C=C content. The influences of HAs and their fractions on the photolysis were investigated by the photodegradation of 2,4-D solutions under simulated solar light irradiation. The degradation rate of 2,4-D was found to decrease in the presence of bulk HAs or their fractions especially at high HAs concentration. The fractions of strong polarity C and D retarded the degradation rate more than the fractions of weak polarity A and B. This could be attributed to the different absorption intensity of the four HAs fractions in the order of D ? C > A > B, and the stronger π-π electron donor-acceptor interactions between the strong polar fractions and 2,4-D. 相似文献
157.
HCHs and DDTs in salt marsh plants taken from intertidal flats in the Yangtze estuary and coastal area in April and July 2002 were determined by GC-ECD. A significant seasonal effect was observed for HCHs and DDTs in sources and concentration levels in different sample types including above-ground tissues and roots as well as the whole plants and rhizospheric sediments. The results indicated that the concentration of t-HCH was higher in the above-ground tissues than in their roots in April; however, the partitioning of DDTs between contaminated sediments and the roots showed the higher concentrations of t-DDT in their roots. HCHs and DDTs concentration levels were higher in above-ground tissues than in roots in July. BCFs of HCHs and DDTs exhibited lower values with higher levels of contaminants in sediments, and higher values with lower levels in sediments. 相似文献
158.
159.
Xiaoxia Ou Jianfang Yan Fengjie Zhang Chunhua Zhang 《Frontiers of Environmental Science & Engineering》2018,12(1):7
In this study, FeVO4 was prepared and used as Fenton-like catalyst to degrade orange G (OG) dye. The removal of OG in an aqueous solution containing 0.5 g·L–1 FeVO4 and 15 mmol·L–1 hydrogen peroxide at pH 7.0 reached 93.2%. Similar rates were achieved at pH 5.7 (k = 0.0471 min–1), pH 7.0 (k = 0.0438 min–1), and pH 7.7 (k = 0.0434 min–1). The FeVO4 catalyst successfully overcomes the problem faced in the heterogeneous Fenton process, i.e., the narrow working pH range. The data for the removal of OG in FeVO4 systems containing H2O2 conform to the Langmuir–Hinshelwood model (R2 = 0.9988), indicating that adsorption and surface reaction are the two basic mechanisms for OG removal in the FeVO4–H2O2 system. Furthermore, the irradiation of FeVO4 by visible light significantly increases the degradation rate of OG, which is attributed to the enhanced rates of the iron cycles and vanadium cycles. 相似文献
160.
为研究水灰比对不同温度作用下混凝土残余抗压强度、质量损失的影响,对不同受火温度和不同水灰比的混凝土标准立方体试件进行高温下及高温后的抗压强度试验和质量损失测试。试验结果表明:随着水灰比的增大,高温下及高温后混凝土抗压强度、混凝土质量损失均呈现出整体下降的趋势。通过试验拟合回归分析,建立了高温下混凝土抗压强度、质量损失与受火温度之间的关系式,可通过质量损失、受火温度来预估高温下混凝土残余抗压强度。 相似文献