加强国有企业党风廉政建设的主要途径加强国有企业党风廉政建设的主要途径

在深化国有企业改革的过程中,大力加强国有企业党风廉政建设。着力构建与现代企业制度相适应的教育、制度、监督并重的惩治和预防腐败体系,遏制腐败现象蔓延的势头。努力铲除滋生腐败的条件和土壤,是一项紧迫而艰巨的重要任务。     

特别策划——湿地碳循环研究

正主持人语:湿地生态系统是陆地生态系统中仅次于森林生态系统的最大碳库,湿地生态系统碳循环在全球碳循环中起着重要作用,湿地碳通量研究是湿地碳循环研究的关键问题。由于湿地独特的水文条件,使得湿地碳循环具有与其他生态系统不同的特点。植被、气候条件及水文状况共同决定湿地生态系统的碳收支。许信旺、何小青等采集湖泊自然湿地及其周边围垦农田的代表性土壤剖面样品,测定了总有机碳含     

Influences affecting the soil-water characteristic curve

INTRODUCTION The soil-water characteristic curve (SWCC) gives the relationship between the amount of water in the soil (i.e. gravimetric or volumetric water content) and soil suction (i.e. matric suction at low suction and total suction at high suction). Many properties of a partially saturated soil such as the coefficient of permeability, shear strength and volume strain, pore size distribution, the amount of water contained in the pores at any suction, can be obtained from the SWCC. …     

Measurement and analysis of soil nitrogen and organic matter content using near-infrared spectroscopy techniques

Near infrared reflectance （N1R） spectroscopy is as a rapid, convenient and simple nondestructive technique useful for quantifying several soil properties. This method was used to estimate nitrogen （N） and organic matter （OM） content in a soil of Zhejiang Province, Hangzhou County. A total of 125 soil samples were taken from the field. Ninety-five samples spectra were used during the calibration and cross validation stage. Thirty samples spectra were used to predict N and OM concentration. NIR spectra of these samples were correlated using partial least square regression. The regression coefficients between measured and predicted values of N and OM was 0.92 and 0.93, and SEP （standard error of prediction） were 3.28 and 0.06, respectively, which showed that NIR method had potential to accurately predict these constituents in this soil. The results showed that NIR spectroscopy could be a good tool for precision farming application.     

提高高中生写作水平的三条途径

当前，我市高中生写作水平普遍不高，其原因之一是作文教学离开了它所赖以成长的客家文化土壤。学生大都难有所见，倘有见，只是零星之见；难有所闻，如有闻，只是道听途说；难有所感，若有感，只是人云亦云；难有所想，如能想，只是表面皮毛。于是，下笔常常无病呻吟，无味无力。     

退化岩溶生态地区植被恢复对土壤化学性质的影响——以石林地区为例

以石林喀斯特地区植被恢复过程中典型样地为研究对象,选择了草从、灌草丛、次生林、原生林、人工林和玉米耕地六种植被类型的土壤PH值,有机碳,全氮含量与C/N比进行了分析比较。结果显示：植被恢复程度越高,土壤PH值就越小,而土壤有机质含量越高;人工造林与植被自然恢复相比,植被自然恢复更有利于土壤质量的改善和植被的生长;耕地与其它样地相比,在退化岩溶生态系统地区,人类活动与不合理利用土地都会使土壤质量受到严重影响。因此,我们平时要注意对喀斯特地区的植被保护,特别是石漠化严重的地区,要严厉禁止人为再次干扰,使各种植被更快更好地恢复起来。     

中国海涂土壤资源系统分类探讨

本文探讨了中国海涂土壤资源定性分类存在的不足,指出了“中国土壤系统分类”在海涂土壤资源定量化分类方面存在的主要问题。根据中国海涂土壤资源的本质特性,提出了中国海涂土壤资源的系列诊断层和诊断特性,在此基础上给出了中国海涂土壤资源定量化的高级分类,包括土纲、亚纲、土类、亚类4级。