排序方式: 共有19条查询结果,搜索用时 15 毫秒
1.
中国黑钻鳞耳蕨组(耳蕨属)的研究 总被引:2,自引:0,他引:2
孔宪需 《应用与环境生物学报》1997,3(2):132-137
对中国黑钻鳞耳蕨组(耳蕨属)种类进行了分类处理.确认中国有12种,并报导了其中2个新种:浪穹耳蕨(Polystichumlangchungense)、洪雅耳蕨(P.pseudo-xiphophyllum). 相似文献
2.
中国西部成都的区域经济特征 总被引:3,自引:0,他引:3
本文介绍了西部成都的区位环境、农业经济、交通运输等状况,认为成都具有成为中国西部中心城市的可能性 相似文献
3.
Hsu BM Wu NM Jang HD Shih FC Wan MT Kung CM 《Environmental monitoring and assessment》2005,104(1-3):155-162
The flow cytometry (FC) has been used to detect Giardia cysts and Cryptosporidium oocysts quantitatively and instantaneously in this study. The experimental results showed that FC is potential to become a more precise method for the detection of Giardia and Cryptosporidium in water. This study also evaluated the staining efficiencies for three commercial antibodies. After staining Cryptosporidium oocysts with direct immunofluorescent antibodies in water samples, two populations were detected in the scatter-plots (FL1 versus SSC) of the FC. The Cryptosporidium oocysts and Giardia cysts are significantly separated from other particles while stained with direct immunofluorescent antibodies produced by Meridian Diagnostics and WaterborneTM Inc. 相似文献
4.
The characteristics of scour holes were discussed including the problems created by them in relation to the hydraulic structures associated with their formation. The philosophy on the design and use of deflector buckets together with the need for plunge basins to dissipate the energy of the high velocity jets were reviewed. Laboratory observations were made to study the erosion of beds of gravel caused by water jets projected from spillway buckets. Flip buckets with 15, 30, 45 and 60 degrees exit angles were utilized. One-quarter inch and %-inch nominal size bed materials were used in the investigation. The gravel was placed in a large comprehensive scour basin to observe their behavior when subjected to the water jets. Besides the formula derived for the maximum depth of scour, a set of dimensionless equations were developed to describe the three-dimensional configuration of scour holes. The dimensions of stable plunge basins could be obtained from these profiles. 相似文献
5.
Cheng Chunyan Zhang Fei Shi Jingchao Kung Hsiang-Te 《Environmental science and pollution research international》2022,29(38):56887-56907
Environmental Science and Pollution Research - Good surface water quality is critical to human health and ecology. Land use determines the surface water heat and material balance, which cause... 相似文献
6.
Liang T Zhang S Wang L Kung HT Wang Y Hu A Ding S 《Environmental geochemistry and health》2005,27(4):301-311
With the continual increase in the utilization of rare earth elements (REEs) for industrial and agricultural purposes in China,
the research into the environmental biogeochemical behavior of REEs has become a pressing issue. The REEs’ content in soil
and various parts of wheat under different conditions in soil–plant systems were measured by INAA and ICP-MS. The results
showed four aspects. (1) The mean value of total REEs in soil of China was 176.8 mg kg−1. The mean ratio of ΣLREE/ΣHREE in soils was 8.0 and cerium accounts for 42% of the total REEs. The content of REEs in wheat
seed ranged between 10−11 and 10−8 g g−1, 3–4 orders of magnitude lower than that in soil. (2) The REEs contents in ryegrass, especially in roots, were significantly
related to that of soil. The bioavailability of REEs in soil mainly depended on the exchangeable fraction of REEs, which was
strongly affected by the physico–chemical properties of the soil. (3) Long-term foliage-dressing with Changle microfertilizer
of REEs did not affect the contents and distribution patterns of REEs in soil. At the maturing stage of spring wheat, the
REEs content was in the order of root > leaf >stem and crust. Compared with the control, foliage-dressing has a higher accumulation
of REEs in root and leaf. However, no significant difference was found in stem and crust between the two treatments. (4) There
was no significant accumulation with the soil-dressing method. When comparing controls in both foliage- and soil-dressing
methods, no distinct residue of REEs in grains was found. 相似文献
7.
8.
Lee JH Hossner LR Attrep M Kung KS 《Environmental pollution (Barking, Essex : 1987)》2002,120(2):173-182
Plutonium uptake by Brassica juncea (Indian mustard) and Helianthus annuus (sunflower) from soils with varying chemical composition and contaminated with Pu complexes (Pu-nitrate [239Pu(NO3)4], Pu-citrate [239Pu(C6H5O7)], and Pu-diethylenetriaminepentaacetic acid (Pu-DTPA [239Pu-C14H23O10N3]) was investigated. Sequential extraction of soils incubated with applied Pu was used to determine the distribution of Pu in the various soil fractions. The initial Pu activity levels in soils were 44.40-231.25 Bq g(-1) as Pu-nitrate Pu-citrate, or Pu-DTPA. A difference in Pu uptake between treatments of Pu-nitrate and Pu-citrate without chelating agent was observed only with Indian mustard in acidic Crowley soil. The uptake of Pu by plants was increased with increasing DTPA rates, however, the Pu concentration of plants was not proportionally increased with increasing application rate of Pu to soil. Plutonium uptake from Pu-DTPA was significantly higher from the acid Crowley soil than from the calcareous Weswood soil. The uptake of Pu from the soils was higher in Indian mustard than in sunflower. Sequential extraction of Pu showed that the ion-exchangeable Pu fraction in soils was dramatically increased with DTPA treatment and decreased with time of incubation. Extractability of Pu in all fractions was not different when Pu-nitrate and Pu-citrate were applied to the same soil. More Pu was associated with the residual Pu fraction without DTPA application. Consistent trends with time of incubation for other fractions were not apparent. The ion-exchangeable fraction, assumed as plant-available Pu, was significantly higher in acid soil compared with calcareous soil with or without DTPA treatment. When the calcareous soil was treated with DTPA, the ion-exchangeable Pu was comparatively less influenced. This fraction in the soil was more affected with time of incubation. The lowest extractable Pu was from a pH 6.55 Crockett soil that contained the highest clay compared to the other two soils. Extractable soil Pu was largely affected by soil pH and the amounts of clay, salt, metal oxide, and carbonate. 相似文献
9.
10.
Atmospheric deposition of PCDD/Fs measured via automated and traditional samplers in Northern Taiwan 总被引:1,自引:0,他引:1
Most polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in the atmosphere are bound to particles which are suspended in the atmosphere, and eventually settle on soil, vegetation, water bodies or other receptors in the environment. Monitoring atmospheric deposition fluxes (dry/wet) is important in tracing the environmental fate and behavior of PCDD/Fs. PCDD/F depositions were collected via an automated PCDD/F ambient sampler and traditional cylindrical vessels, respectively, from April 2007 to February 2008. The automated PCDD/F ambient sampler used in this study can prevent both re-suspension and photo degradation of the PCDD/Fs collected and effectively separates the PCDD/F samples into dry and wet contributions. The results indicated that the ambient PCDD/F concentrations collected using the PS-1 sampler ranged from 0.02 pg I-TEQ/m3 to 0.16 pg I-TEQ/m3 in Northern Taiwan. The results also indicated that the PCDD/F deposition flux collected using the automated PCDD/F sampler (17.5 pg I-TEQ/m2 d to 25.8 pg I-TEQ/m2 d) was significantly higher than that sampled with the cylindrical vessels (2.0 pg I-TEQ/m2 d to 9.9 pg I-TEQ/m2 d). The difference was attributed to the fact that part of the PCDD/F depositions collected using the traditional cylindrical vessels had undergone photo degradation and evaporation. In addition, the wet deposition flux of PCDD/Fs (39.4 pg I-TEQ/m2 rainy day to 228 pg I-TEQ/m2 rainy day) observed in this study was significantly higher than the dry deposition flux (12.3 pg I-TEQ/m2 sunny day to 16.7 pg I-TEQ/m2 sunny day). These results demonstrated that wet deposition is the major PCDD/F removal mechanism in the atmosphere. 相似文献