Naturely, occupying rate equal to square proportion that all kinds of agro-geology environmental factor's component parts be included into distribution of agricultural and pastrol area during a certain period.
进占程度实质又是在一定时期内农牧区的分布中各农业地质环境要素的具体构成类型分占的面积比例，这样，经典信息熵定义就找到了完全适用的条件。
Thus we find, development of AEG condition of Loess Plateau Area can be described with occupying proportion that mankind's agricultural action (taking distribution of agricultural and pastrol area as index) to agro-geology environmental factors and their component parts.
由此，黄土高原农业环境地质系统的状态变化完全可以由人类农事活动（以农牧业区的分布状况为指标）对农业地质环境要素及其构成类型的进占程度来描述。
Stand on a base of upper study, this paper choose distribution map of agriculture and stock raising in seven different historical age as basic material, sum up ten agro-geology environmental factors into Loess plateau Area's AEG system, and cover all these factor's component parts map on distribution draft of every period's agricultural and pastrol, then measure the occupying proportion, bring results into fomula of factor information entropy, finally, take average value of ten factor's information entropy in each period as its characteristical AEG system entropy value.
在以上研究的基础上，论文选择黄土高原地区七个历史时期的农牧业分布图作为基本资料，将该区的十个地质环境要素纳入农业环境地质系统中，将其类别分布图与上述农牧业分布图进行叠加量测，结果代入要素系统熵计算公式，求得了十个农业地质环境要素在各个历史时期中的系统熵，对每个历史时期的这十个熵值求算术平均值就获得了该历史时期黄土高原地区总的农业环境地质系统熵。
Henan Agricultural University, Zhengzhou 450002; 2.The Geology College of China Geo-science University, Beijing 100083; 3.Henan Institute of Geological Survey Zhengzhou 450007
河南农业大学郑州450002(韩春建，冯新伟，吕巧灵)，中国地质大学北京100083，河南省地质调查院郑州450007付巧玲
Agricultural Chemistry, Geochemistry and Agricultural Geology
农业化学和地球化学与农业地质的几个问题
It is of significance to study agricultural geology for agricultural production.
研究农业地质对农业生产有重要意义。
Agricultural geology takes as a pressing task researching on relation of soil to its mother rock and of soil to growth of crops, hence enjoying excellent development prospects.
农业地质学所面临的一个任务是研究土壤与围岩的关系，土壤与农作物的关系，其发展前景无限美好。
Because Zhejiang Province is a frontier of open area, it becomes an urgent matter to develop the benefit agriculture, the characteristic agriculture and the green agriculture, to guarantee clean and the insecurity of agricultural product and to verify the agricultural geology environment quality condition.
作为对外发展前沿地区的浙江省，发展效益农业、特色农业、绿色农业，保证农产品的清洁和安全，查明农业地质环境质量状况已成当务之急。
THE PREVENTION AND TREATMENT METHODS FOR SEISMIC GEOLOGY HAZARDS IN GANSU CALAMITY REGION BY WENCHUAN EARTHQUAKE Occurrence of Agricultural Floods and Droughts and Forecasting of Serious Disasters in Hengyang City
汶川地震甘肃省重灾区次生地质灾害及防治衡阳市农业旱涝灾害发生规律及大灾预测
The conclusions are as follows: the narrow sense of groundwater vulnerability from nature hydrologic geology is that main river way, alluvial flat, second bottom and artificial earth fill are the most vulnerable, but this doesn't agree with real pollution distribution; Considering human behavior and distribution of pollution, the broad sense one is that city proper and north suburbs irrigation by polluted water are the most, this agrees with the real pollution distribution, but the grading contrast in broad agricultural region isn't obvious.
结果显示：从纯水文地质条件出发，西安市地下水污染的狭义敏感性，以主河道、漫滩阶地、一级阶地和人工填土区最为敏感，与中心城区地下水污染的实际分布状况有较大偏离；考虑人类活动及污染源分布，广义敏感性为，西安市地下水污染的敏感性以建城区和北郊污灌区最为敏感，与地下水污染的现实分布格局相一致，但在广阔的农业区，使得敏感性等级不甚明显。