浅析影响艾青诗美理想形成的中外因素     

王咏桂 《贵州教育学院学报》2005,21(1):55-59

艾青艺术世界建构过程中诗美理想的形成与中国传统文化因素及西方外来文化因素的影响有密切的渊源关系，在东西方文化的交融中，艾青显现出他“植根中国文化沃土的诗人”和“吸收西方文化营养的诗人”的创作品格。  相似文献   

漯河市土壤中金属等元素含量分布特征     

鲁艳春  贺金锋  高桂清 《漯河职业技术学院学报》2008,7(5):1-2

对漯河市土壤中金属等元素的含量进行监测分析,初步摸清了漯河市辖区内土壤中金属等元素的分布特征。  相似文献   

黄土高原旱作田土壤水分效应研究     

仇化民 《资源科学》1995,17(4):46-51

在年降水量450-600mm的黄土高原旱作区，耕作土壤持水性好，渗透性强，具有显著的水分吐纳和调节功能，2m土层内可容纳550-600mm的水分，雨季降水是土壤水分补给的主要源泉，土壤蓄水量的高峰期和低谷期落后于降水的高峰和干旱少雨期。蓄水量低谷期出现在6月中旬，元月上旬前后是蓄水最稳定时期。  相似文献   

中国东部地区典型森林类型土壤有机碳储量分析   总被引：28，自引：0，他引：28  

张城  王绍强  于贵瑞  何洪林  张文娟  陈庆美  王伯伦  吴志峰 《资源科学》2006,28(2):97-103

森林土壤有机碳(SOC)是土壤有机碳库的重要组成部分，在土壤有机碳库研究中有着重要作用。本文对中国东部地区7个典型森林的土壤样区碳储量进行了野外调查与对比研究，分析了6种土壤类型和28种植被类型的SOC储量及其随深度的变化。结果表明，调查区域内SOC储量的分布范围在4.01kg～30.12kg/m³之间，在各土壤类型中，长白山棕黑毡土的有机碳储量最高，SOC储量为24.41kg/m³，千烟洲红壤的有机碳储量最低，SOC储量为6.47kg±1.01kg/m³；在各植被类型中，鸡公山的黄山松林SOC储量最高，SOC储量为30.12kg±22.76kg/m³。千烟洲常绿阔叶林土壤的有机碳储量最低，SOC储量为4.01kg±3.56kg/m³，部分地区SOC储量还有一定的增长潜力。年均温与SOC储量呈负相关，但7个典型森林类型土壤碳储量的分布，在由北向南的方向上没有明显的特征。初步分析认为，土地利用类型是影响本研究所调查地区SOC储量分布的主要因子。7个典型森林类型土壤碳储量随土层深度的下降而降低，其中自然林土壤碳储量降低幅度相对较大，人工林土壤碳储 量降低的幅度相对较小。人工林土壤剖面上层SOC储量相对较低，导致了人工林土壤整体有机碳储量比较低。  相似文献   

福建省土壤侵蚀空间分布规律及防治对策探讨   总被引：2，自引：0，他引：2  

林敬兰 《资源科学》2004,26(Z1):111-118

福建省在20世纪90年代,开展了两次基于3S技术的土壤侵蚀调查,结果表明,福建省20世纪90年代中期土壤侵蚀以水力侵蚀为主,占侵蚀总面积15 070.07km2的98.42%,侵蚀面积随着侵蚀强度的增加而减少;侵蚀面积占土地面积的比例高于全省平均值12.31%的6个设区市都是位于东部沿海,占全省土地总面积44.20%的东部沿海占据了侵蚀总面积的56.26%,相对侵蚀面积东、西部分别为15.66%和9.65%.然而,强度以上侵蚀面积则东部沿海比西部内地少196.56km;从土壤侵蚀现状图上还表现出侵蚀斑大多分布在人类生活区附近,离居民区越近,侵蚀越重的特点.90年代末期的土壤侵蚀主要为水力侵蚀,侵蚀面积为13 127.31km2,随着侵蚀强度的增加而减少,其空间分布规律与90年代中期一致,即土壤侵蚀在空间分布上呈现出块状不连续分布的特点,侵蚀总面积和轻中度侵蚀面积由东南部沿海向西北部内陆下降而强度以上侵蚀面积相反.根据福建省土壤侵蚀空间分布规律,结合福建省的生态环境特点,作者提出了发挥生态自我修复功能、发展经济,解决农村能源问题、加强监督执法和监测工作等对策.  相似文献   

Field investigation on effects of wheat-straw/corn-stalk mulch on ecological environment of upland crop farmland   总被引：2，自引：0，他引：2  

董志勇  钱炳法 《浙江大学学报(A卷英文版)》2002,3(2):209-215

This work systematically investigates the effects of wheat-straw/corn-stalk mulch on the ecological environment in upland crops (winter wheat, summer corn) field from 1997 to 1998. With and without mulch soil moisture distribution, water demand, day and night variation of soil temperature, weeds control, crop yields, water and soil conservation, as well as improvement of soil texture were experimentally investigated. The optimal mulch rate for both water saving and yield-increase was determined. Ineffective interplant evaporation can be turned into effective transpiration of leaf by application of wheat-straw/corn-stalk mulch, which enhances the utility factor of soil moisture and reduces irrigation norm, and may also regulate soil temperature, increase soil fertility, and improve soil texture after being returned to the field. Wheat-straw/corn-stalk mulch inhibits evaporation of moisture so that accumulation of salinity near the soil surface is prevented, and thus ameliorates salinization of land. In the region of severe soil erosion, mulch is used to cover land so as to forestall hydraulic and wind erosion of the soil.  相似文献   

永世为农的文学表达——重读李锐《厚土》系列小说     

李彦文 《海南师范大学学报(社会科学版)》2011,24(6):64-68

李锐的《厚土》系列小说艺术性颇高。80年代批评在评价李锐的《厚土》系列小说时,将对艺术性的发现组织到“民族文化心理”的揭示上,因而忽略了对其艺术性的有效阐释。论文从审美批评的角度重读《厚土》,认为《厚土》以非现代亦非田园的时空建构与“滴——滴”式叙事结构,达到了对在乡土中国永世为农的人的处境的文学表达。  相似文献   

《土力学与地基基础》课程教学改革探析     

姬凤玲 《深圳职业技术学院学报》2012,11(5):77-80

根据《土力学与地基基础》的特点及多年的教学实践经验,从教学内容、教学方法2方面对该课程教学改革进行了探索．在教学内容方面引入了临界状态土力学理论与基于明德林（Mindlin）解答的地基土中竖向附加应力计算等内容．在教学方法方面采用渗透式双语教学、探讨式课堂教学、系统研究型试验教学等方法,有效提高了教学质量．  相似文献   

Model tests on interaction between soil and geosynthetics subjected to localized subsidence in landfills     

Bin Zhu  Deng Gao  Jun-chao Li  Yun-min Chen 《浙江大学学报(A卷英文版)》2012,13(6):433-444

In a landfill, excessive tensile strains or failure of the liner system due to localized subsidence underneath the geosynthetic liner, is a concern in design and operation of the landfill. The localized subsidence can be commonly withstood by reinforcements such as geogrids. A total of nine model tests were carried out to study the influence of soil arching in overburden sandy soil on the geosynthetics and the interaction between the soil and the geosynthetics. The localized subsidence was modeled by a strip trapdoor under the geosynthetic reinforcements. The reinforcement includes several layers of polyvinylchlorid (PVC) membrane or both PVC membrane and a compacted clay layer. Test results show that the vertical soil pressure acting on the geosynthetics within the subsidence zone is strongly related to the deflection of the geosynthetics. The soil pressure acting on the deflected geosynthetics will decrease to a minimum value with respect to its deflection if the final deflection is large enough, and this minimum value is almost independent of the overburden height. Otherwise, the deflection of geosynthetics cannot result in a full degree of soil arching, and the soil pressure within the subsidence zone increases with the increase of overburden height. Deflections and strains of the geosynthetics obviously decrease with the increase of their tensile stiffness. The presence of a compacted clay layer buffer can therefore reduce both deflections and strains of the geosynthetics. Finally, a composite liner structure is recommended for landfills to withstand the localized subsidences.  相似文献   

Automated soil resources mapping based on decision tree and Bayesian predictive modeling   总被引：1，自引：0，他引：1  

周斌  张新刚  王人潮 《浙江大学学报(A卷英文版)》2004,5(7):782-795

This article presents two approaches for automated building of knowledge bases of soil resources mapping.These methods used decision tree and Bayesian predictive modeling,respectively to generate knowledge from training data.With these methods,building a knowledge base for automated soil mapping is easier than using the conventional knowledge acquisition approach.The knowledge bases built by these two methods were used by the knowledge classifier for soil type classification of the Longyou area,Zhejiang Province,China using TM bi-temporal imageries and GIS data.To evaluate the performance of the resultant knowledge bases,the classification results were compared to existing soil map based on field survey.The accuracy assessment and analysis of the resultant soil maps suggested that the knowledge bases built by these two methods were of good quality for mapping distribution model of soil classes over the study area.  相似文献