Total nitrogen and community turnover determine phosphorus use efficiency of phytoplankton along nutrient gradients in plateau lakes

Numerous studies support that biodiversity predict most to ecosystem functioning, but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied. We investigated 398 samples of the phytoplankton phosphorus resource use efficiency (RUE_P = chlorophyll-a concentration/dissolved phosphate) across two seasons in nine plateau lakes in Yunnan Province, China. We identified the main contributors to phytoplankton RUE_P and analyzed their potential influences on RUE_P at different lake trophic states. The results showed that total nitrogen (TN) contributed the most to RUE_P among the nine lakes, whereas community turnover (measured as community dissimilarity) explained the most to RUE_P variation across the two seasons. Moreover, TN also influenced RUE_P by affecting biodiversity. Species richness (SR), functional attribute diversity (FAD2), and dendrogram-based functional diversity (FDc) were positively correlated with RUE_P in both seasons, while evenness was negatively correlated with RUE_P at the end of the rainy season. We also found that the effects of biodiversity and turnover on RUE_P depended on the lake trophic states. SR and FAD2 were positively correlated with RUE_P in all three trophic states. Evenness showed a negative correlation with RUE_P at the eutrophic and oligotrophic levels, but a positive correlation at the mesotrophic level. Turnover had a negative influence on RUE_P at the eutrophic level, but a positive influence at the mesotrophic and oligotrophic levels. Overall, our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversity-ecosystem functioning relationships are investigated.     

白洋淀的纤毛虫及与水质污染的关系

对白洋淀纤毛虫的种类组成、优势种进行了初步调查，同时对水质进行理化监测，共鉴定出纤毛虫４８种。根据Ｍａｒｓｓｏｎ引出的污水生物体系法分析，白洋淀纤毛虫主要由耐有机污染的种群组成。说明白洋淀主要受有机污染。纤毛虫的种类数与水体中ＴＮ、ＴＰ、ＢＯＤ５有着密切关系。     

济南市水文地质特征对地下水污染的影响分析

从环境水文地质学的角度出发，对济南市地下水污染的主要途径和方式，以及局部地下水重污染区进行了较为详细的分析，济南市地下水污染以浅层地下水污染为主，局部地区深层地下水也已受到污染，并有进一步加重的趋势，地下水严重超采，造成多处地表塌陷和降落漏斗，并成为济南市地下水的重污染区。     

试论我国陆地再生能源资源及其特征

在世界矿物能源资源日趋减少的今天,再生能源资源引起人们广泛的兴趣,特别是陆地再生能源资源更是如此。本文对我国陆地再生能源资源——太阳能、风能、水能、生物质能——中的前两种能源资源进行了分区及分省计算,并依据全国已有的调查及普查资料,对后两种源能资源进行了分省及分区统计,在此基础上又对全国陆地再生能源资源的数量、分布及特征进行了对比分析,并从宏观上提出了开发利用我国陆地再生能源资源的建议和设想。     

Preconcentration and determination of trace copper(II) in natural water using silica gel modified with 1-(2-pyridylazo)-2-naphthol

Trace copper (II) in water can be preconcentrated using silica gel modified with 1-(2-pyridylazo)-2-naphthol (PAN) and be determined spectrophotometri-cally. The conditions for the preconcentration were studied. The method was applied to both artificial and natural water samples and the results suggest that copper (II) of ppb level in water can be measured accurately after the preconcentration.     

锅炉烟气脱硫技术发展综述

在调查研究的基础上，论述国内外烟道气脱硫技术的发展与前景，提出开发生产适合我国国情的烟气脱硫技术势在必行。还简要介绍了最为普遍的石灰／石灰石法脱硫基本原理。     

我国生态工业园区稳定性的调研报告

作为可持续发展的重要实践工具，生态工业园（EIPs）建设得到快速推进的同时，也由于多方面存在的影响因素制约，使园区面临“不稳定”风险．本调研报告通过专家调查和全国范围内的统计调查确认了“技术充足，政府支持，行业多样，核心组员，成员沟通”等5个影响因素对我国生态工业园区稳定发展具有显著影响，并对数据结果做了进一步的讨论，提出了相应的政策建设。     

In situ preparation of g-C3N4/Bi4O5I2 complex and its elevated photoactivity in Methyl Orange degradation under visible light

A graphite carbon nitride(g-C_3N_4) modified Bi_4O_5I_2 composite was successfully prepared insitu via the thermal treatment of a g-C_3N_4/Bi OI precursor at 400°C for 3 hr.The as-prepared g-C_3N_4/Bi_4O_5I_2 showed high photocatalytic performance in Methyl Orange(MO) degradation under visible light.The best sample presented a degradation rate of 0.164 min~(-1),which is 3.2 and 82 times as high as that of Bi_4O_5I_2 and g-C_3N_4,respectively.The g-C_3N_4/Bi_4O_5I_2 was characterized by X-ray powder diffractometer(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Raman,X-ray photoelectron spectroscopy(XPS),ultraviolet-visible diffuse reflectance spectra(DRS),electrochemical impedance spectroscopy(EIS) and transient photocurrent response in order to explain the enhanced photoactivity.Results indicated that the decoration with a small amount of g-C_3N_4 influenced the specific surface area only slightly.Nevertheless,the capability for absorbing visible light was improved measurably,which was beneficial to the MO degradation.On top of that,a strong interaction between g-C_3N_4 and Bi_4O_5I_2 was detected.This interplay promoted the formation of a favorable heterojunction structure and thereby enhanced the charge separation.Thus,the g-C_3N_4/Bi_4O_5I_2 composite presented greater charge separation efficiency and much better photocatalytic performance than Bi_4O_5I_2.Additionally,g-C_3N_4/Bi_4O_5I_2 also presented high stability.·O_2~-and holes were verified to be the main reactive species.     

城市生活垃圾综合处理系统的选择

以上海城市生活垃圾处置为对象，利用层次分析方法，选择了分选回收＋堆肥＋卫生填埋的综合处置系统，并且确定了堆肥方式应首先考虑仓式静态好氧堆肥。经过运行费比较，所选择的综合处置系统比现行的处置系统具有明显的优势。     

染化废水厌氧生物处理技术的研究

鉴于厌氧微生物对偶氮染料的还原裂解作用，开发了以易降解工业有机废水作为外加碳源的染化废水厌氧生物处理的新技术．试验结果表明：在进水ＣＯＤ３１００—３５００ｍｇ／Ｌ，ＣＯＤ总／ＣＯＤ染化比值４０，ＨＲＴ３．０ｄ下，ＣＯＤ去除率＞８０％，最低染化ＣＯＤ去除率＞４５％，色度去除率＞８５％；实验证实，在厌氧处理过程中，染料组分的结构已发生了明显的变化；反应器内的污泥大多呈颗粒状；污泥活性和工艺性能可控制工艺运行参数得以维持．