彭州市丹景山镇典型农作物输出系数研究   总被引：1，自引：0，他引：1  

邢立文  魏新平  王龙  李华  王军勤  周云  何荣智 《中国农村水利水电》2012,(8):58-61

农业非点源污染具有随机性大、分布范围广、危害性大等特点,已成为重要的环境污染方式。根据现场实测,分析了四川省彭州市丹景山镇不同作物田的总氮、总磷输出系数,探讨了不同作物及不同典型水文年输出系数形成差异的原因,完善了输出系数模型,为控制丹景山镇农业氮素、磷素的输出提供建议。  相似文献   

牡丹江市大气污染治理存在的问题及对策   总被引：1，自引：0，他引：1  

李静 《现代农业科技》2013,(5):241+243

黑龙江省牡丹江市大量利用煤炭为能源,使得牡丹江市的大气质量问题一直不容乐观。通过介绍牡丹江市传统的大气污染控制情况及治理策略所存在的问题,提出合理化的对策,以期为寻找更好的治理方式提供参考。  相似文献   

浅谈提高房地产项目环评审批效率的措施     

祝妍华  徐安安 《安徽农业科学》2014,(7):2091-2092,2100

为提高苏州高新区房地产建设项目的环评审批效率,在此分析了房地产项目的建设特点及环评审批现状,并结合相关的法律法规依据,提出合理调整环评评价内容、降低环评评价等级、提高环评审批效率的意见和建议。  相似文献   

我国高校环境科学专业本科人才培养改革浅探     

白秀玲  周云凯 《安徽农学通报》2012,18(3):102-104

随着环境问题的日益复杂以及科技的快速发展,我国传统的环境科学专业人才培养模式已不能适应社会发展的需要。该文通过分析我国目前环境科学专业人才培养存在问题,提出环境科学专业人才培养应采取的思路和具体途径,旨在为我国环境科学专业建设与发展提供参考。  相似文献   

基于神经网络模型的青岛市城区土壤重金属污染源定位     

吴育文  徐英凯  刘通  林晖 《湖北农业科学》2013,52(3)

建立基于遗传算法的BP神经网络系统,该模型可以有效描绘区域中重金属元素的分布情况,并由此通过各元素浓度极大值点求出污染源近似坐标,实现对污染源的定位.将该模型运用于青岛市,根据青岛市不同功能区的土壤重金属含量调查结果,实现了对可能重金属元素污染源位置的预测.  相似文献   

环境条件对重阳木生长的影响   总被引：1，自引：0，他引：1  

曹志华  文佳  胡娟娟  束庆龙* 《中国林副特产》2012,(4):8-11

对重阳木以通径分析方法分析其生长状况与环境条件的关系。结果表明:多行的重阳木与其生长状况呈较强的正相关关系,除直接作用外,根系半深埋,根系损害以及地面硬化等均可通过其对生长状况产生影响;根系正常与冠幅生长相关性较强,除直接作用外,多行,根系伤害以及地面硬化程度均可通过其对冠幅生长产生影响;单行的重阳木与树干生长关系密切,除直接作用外,根系深埋、根系伤害程度以及地面硬化程度均可通过其对树干生长产生影响;根系深埋推迟发芽时间,除直接作用外,单行以及地面硬化均可通过其对发芽时间产生影响。  相似文献   

人工湿地法解决五岳河水污染问题的可行性     

聂鑫 《黑龙江农业科学》2010,(8):153-154

人工湿地作为一种污水生物处理技术,因其具有独特的优势,已得到广泛的应用。针对五岳河水污染现状,结合人工湿地处理废水的特点,从场地选择、工艺类型选择等方面论述利用人工湿地法解决五岳河水污染问题的可行性。  相似文献   

论鄂尔多斯东北部的资源开发与环境整治   总被引：3，自引：0，他引：3  

郭绍礼 《干旱区资源与环境》1994,8(1):29-43

本文是从资源开发条件的评价入手，揭示所出现的环境问题，并提出建立人工高效开发－整治型的综合模式结构，以便持续稳定地协调好资源开发与环境整治的关系，促进这里的经济发展。  相似文献   

Organoclays for controlled release of the herbicide fenuron     

Hermosin MC  Calderón MJ  Aguer JP  Cornejo J 《Pest management science》2001,57(9):803-809

Organoclays were assayed as matrices in which to associate herbicides, with the aim of decreasing product losses that could give rise to water contamination from agricultural activities. Fenuron was selected as model of a very mobile and highly water-soluble herbicide. Two different organoclays of high (A-HDT) and low (H-C18) reversible fenuron sorption were selected. Herbicide-organoclay complexes were prepared from the two organoclays and with two different fenuron contents (20 and 40 g AI kg-1) and two different mixing times, so as to form a series of weak and strong complexes. The release of fenuron from those complexes into water and water/soil suspensions gave values of T50 (time to release 50% of the fenuron content) ranging from 0.3 min to 2400 h. The total fenuron released in these closed systems ranged from 48 to 80% of the fenuron in the complex. The organoclay type (high or low sorptivity) had the greatest influence on fenuron release, followed by the strong or weak complex, suggesting that herbicide-organoclay interactions are the main factors controlling release. Soil column leaching experiments showed fenuron-organoclay complexes to be effective in reducing the peak herbicide concentration in the leachate to a half (6 microns) or a quarter (3 microns) of that obtained from the free technical compound (12 microns). Herbicide lost through leaching was reduced from 78% for the free technical fenuron to 50-30%, depending on the organoclay used as carrier and the strength of the complex. Bioassay with ryegrass showed that the weak fenuron/H-C18 complex (40 g AI kg-1) gave the same herbicidal activity as technical fenuron. The potential suitability of low-sorptive organoclays for conferring slow-release properties on the fenuron complex has been demonstrated.  相似文献   

Effect of pyrethroids on carbohydrate metabolic pathways in common carp,Cyprinus carpio     

K Kamalaveni  V Gopal  Ursula Sampson  D Aruna 《Pest management science》2001,57(12):1151-1154

The activity levels of succinate dehydrogenase (SDH) and glucose‐6‐phosphate dehydrogenase (G6PD) were assessed in various tissues of Cyprinus carpio var communis which had been exposed to lethal concentrations of group‐II pyrethroids (deltamethrin, cypermethrin, fenvalerate and fluvalinate) for a period of 72 h. The results indicated a steady decrease in SDH activity with a concomitant increase in G6PD activity. The decreased SDH activity indicated inhibition of SDH at mitochondrial level and the increased G6PD activity an enhancement of an alternative pathway of carbohydrate metabolism, viz the hexose monophosphate shunt (HMP) or pentose phosphate pathway as a biochemical adaptation to overcome the toxic stress. © 2001 Society of Chemical Industry  相似文献