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921.
922.
以吉(林)长(春)高速公路为例,论述了高速公路施工期、营运期对沿线生态环境、大气环境、声学环境、水环境可能产生的影响程度及范围。 相似文献
923.
924.
Lallai A Mura G Palmas S Polcaro AM Baraccani L 《Environmental science and pollution research international》2003,10(4):221-224
Olive mill wastewater contains some phenolic compounds that cause antibacterial activity of a kind that prevents biological treatment without previous dilution. Among these phenolic compounds, p-hydroxybenzoic acid (PHB) is considered to be one of the most representative. This work examines the biodegradation of PHB by aerobic microbial mixed cultures previously acclimatized to glucose, which was used as an easily biodegradable model compound. Microbial growth runs were carried out in a batch reactor in the PHB concentration range of 200-1000 mg/L. In all the runs the PHB proved to be completely degradable. The specific growth rates obtained were in the range of 0.16-0.35 l/h. Experimental runs showed that the functional relationship between the specific growth rate and PHB concentration was that proposed by Monod. The kinetic constants of the Monod equation (mu(max) and K(S)) and biomass yield coefficient (Y) were determined experimentally. With the parameter values thus obtained, a mathematical model that also takes account of the duration of the lag phase was employed to describe both the microbial growth and the consumption of PHB. The concentration values of the model fit well with the data obtained experimentally. 相似文献
925.
采用生物膜与悬浮生长强化处理工艺,提高了高负荷生物滤池后续活性污泥的抗冲击负荷和可生化性.综合了生物滤池与活性污泥法各自的优越性,提高了处理效果. 相似文献
926.
扁刺栲在两种类型林分中的生长过程分析 总被引:5,自引:0,他引:5
通过对扁刺栲—华木荷林区针阔混交林、次生阔叶林的群落调查以及扁刺栲的树干解析.研究结果表明:(1)扁刺栲在针阔混交林与次生阔叶林中,胸径快速生长期分别在a8~12和a10~14之间,生长高峰值分别出现在a10和a12,最大值分别为1.07cm和0.85cm.(2)扁刺栲在针阔混交林与次生阔叶林中,树高快速生长期分别在a6~10和a10~14之间,生长高峰值分别出现在a8和a10,最大值分别为0.55m和0.56m.(3)在针阔混交林中,16a生扁刺栲单株材积达0.0134m^3,而在次生阔叶林中只有0.0103m^3.在分析不同林分中扁刺栲生长差异及其原因的基础上,建议对次生阔叶林经营应采用动态管理. 相似文献
927.
The Northwest Forest Plan: Origins, Components, Implementation Experience, and Suggestions for Change 总被引:5,自引:0,他引:5
JACK WARD THOMAS JERRY F. FRANKLIN† JOHN GORDON‡ K. NORMAN JOHNSON§ 《Conservation biology》2006,20(2):277-287
Abstract: In the 1990s the federal forests in the Pacific Northwest underwent the largest shift in management focus since their creation, from providing a sustained yield of timber to conserving biodiversity, with an emphasis on endangered species. Triggered by a legal challenge to the federal protection strategy for the Northern Spotted Owl ( Strix occidentalis caurina ), this shift was facilitated by a sequence of science assessments that culminated in the development of the Northwest Forest Plan. The plan, adopted in 1994, called for an extensive system of late-successional and riparian reserves along with some timber harvest on the intervening lands under a set of controls and safeguards. It has proven more successful in stopping actions harmful to conservation of old-growth forests and aquatic systems than in achieving restoration goals and economic and social goals. We make three suggestions that will allow the plan to achieve its goals: (1) recognize that the Northwest Forest Plan has evolved into an integrative conservation strategy, (2) conserve old-growth trees and forests wherever they occur, and (3) manage federal forests as dynamic ecosystems. 相似文献
928.
高温和干旱对银杏光合作用、叶片中黄酮苷和萜类内酯含量的影响 总被引:1,自引:0,他引:1
为了探讨高温和干旱的相互作用对银杏(Ginkgobiloba)生长及叶内次生代谢物的影响,设干旱、高温(夜间30℃)和干旱+高温3个处理,测定了2年生银杏幼苗的生长指标、光合特性、叶片水势、气孔导度以及叶内黄酮苷和萜类内酯的含量。与对照(未经干旱或高温处理)相比,高温引起银杏叶片最大净光合速率降低,气孔导度和光补偿点增加;干旱处理后,银杏最大净光合速率、气孔导度和叶片水势均降低,但光补偿点以及叶片黄酮苷和萜类内酯含量增加,表观量子产量变化不明显。高温和干旱共同作用下,银杏光补偿点和呼吸速率增高,光饱和点显著降低,根冠干重比无统计学上显著变化,但总干重降低。上述结果说明干旱和高温降低了银杏对光的适应范围,银杏光能利用效率变低,气孔导度下降,最大净光合速率降低,呼吸作用增强,抑制了生长;干旱引起黄酮苷和萜类内酯含量增加的幅度大于高温。 相似文献
929.
介绍了"十五"期间我省电离辐射环境质量状况和电磁辐射环境质量状况;核技术应用单位放射环境质量概况、辐射环境监督管理以及辐射环境的基础能力建设状况。 相似文献
930.
N. V. Bazova A. V. Bazov N. M. Pronin N. A. Rozhkova L. T. Dashibalova Z. I. Khazheeva 《Russian Journal of Ecology》2008,39(6):438-443
Data on the occurrence, abundance, and biomass of caddis fly larvae Aethaloptera evanescens in the Selenga during the ice periods of 1987–2005 are presented. These insect larvae prefer river stretches with a gravel-sand ground, flow rate of 0.3–0.4 m/s, and depth of 2–3 m. Probable factors determining their distribution in the Selenga in recent years are a considerable drop of water level in the river (1995–2005), the improvement of hydrochemical conditions, and the presence of suspended and drifting erosion materials entering the river as a consequence of sand-gravel mixture excavation between 1980 and 1990. 相似文献