Geographical Tendencies of Trace Element Contents in Soils Derived from Granite,Basalt and Limestone

来源 :Pedosphere | 被引量 : 0次 | 上传用户:heiyun28
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
92 soil samples were collected from granite, basalt and limestone areas of eastern China and determined for 13 trace element contents. The geographical tendencies of and factors affecting trace element contents in soils were studied.The sequences of soil trace element contents (especially the transitional elements in the 4th period) were: basalt soils > limestone soils > granite soils.The contents of trace elements in soils of granite areas and basalt areas showed great inheritance of trace element contents from the relevant parent rocks. The contents of trace elements in limestones were very low, but they became very high in limestone soils. Trace element contents of soils derived from limestone and basalt’increased significantly from north to south, these tendencies were similar to the tendency of ferric oxide contents in soils.There were differences of contents of trace elements bound to ferric oxide in different kinds of parent material and in different types of soil. The correlations between the co 92 geographical samples were collected from granite, basalt and limestone areas of eastern China and determined for 13 trace element contents. The geographical tendencies of and factors affecting trace element contents in soils were studied. The sequences of soil trace element contents (especially the transitional elements in the 4th period) were: basalt soils> limestone soils> granite soils. contents of trace elements in soils of granite areas and basalt areas showed great inheritance of trace element contents from the relevant parent rocks. The contents of trace elements in limestones were very low, but they became very high in limestone soils. Trace element contents of soils derived from limestone and basalt’increased significantly from north to south, these tendencies were similar to the tendency of ferric oxide contents in soils. Here were differences of contents of trace elements bound to ferric oxide in different kinds of parent material and in different types of soil. The correlati ons between the co
其他文献
滑动变阻器是电学实验中使用率极高的仪器,其用法也是历年高考的考查热点,其连入电路时通常有分压和限流两种连接方法,下面对两种接法作一简单比较(见表1).  一、选择连接方式的原则  由上表可见,滑动变阻器的两种电路连接方法均能控制负载的电流、电压,但两种接法之间还是有一些差异的,埘不同的负载产生的效果小同,在应用时必须根据实际情况取长避短,应遵循以下原则.  1.安伞原则:变阻器是一种控制器件,在电
本研究对中国企业管理者的职业选择及其影响因素进行了考察。结果发现,社会认知职业模型基本适用于该群体:其结果预期对职业兴趣有显著影响;其管理自我效能及结果预期对职业承诺有显著影响;其社会、经济支持对职业承诺的影响不显著,但对自我职业生涯管理有显著影响;其管理自我效能及自我职业生涯管理对工作绩效有显著影响;但仍有某些变量间的路径关系未得到验证。
阜阳市局 £4a 局长——_MINtkMMtgj’#lnH$B——q.M——D收束志不他只邀狲位J则【科校为先导推动地租工作.B为广为戳民U用凶盼引眯B.习.互们羹宽.互狈槽竺汹IAn.刊 办好杂志。必
疥疮是由人疥虫寄生于人体皮肤薄嫩处,如手腕、指缝、脐周及臀部等部位,成人较少累及头皮和面部,婴儿则可累及全身各个部位.属于慢性传染性皮肤病,可引起医院感染,在聚集人群
阜阳市局 £4a 局长——_MINtkMMtgj’#lnH$B——q.M——D收束志不他只邀狲位J则【科校为先导推动地租工作.B为广为戳民U用凶盼引眯B.习.互们羹宽.互狈槽竺汹IAn.刊 办好杂志。必
随着火车票预售期提前到二十天,对网友体力、智力、运气进行全面考验的“春节抢票运动会”已全面拉开帷幕。与官方网站票源高度紧张形成鲜明对比的是,某些“代购”网站却宣称可以“优惠”、“无限制”供票。然而,这些渠道很有可能是不法分子为盗取消费者财产、信息所精心布设的陷阱。为了保证大家都能安心出行,趋势科技提醒消费者一定要前往官方指定网站购票,并使用趋势科技PC-cillin2013等安全防护软件甄别可能出
近30年来,城市空间经历了相当可观的变化。在人口、经济、技术、社会与种族等因素交相作用之下,大城市解体了。关于市区的概念,例如市中心或市的边界的概念,含义已和过去不
请下载后查看,本文暂不支持在线获取查看简介。 Please download to view, this article does not support online access to view profile.
阜阳市局 £4a 局长——_MINtkMMtgj’#lnH$B——q.M——D收束志不他只邀狲位J则【科校为先导推动地租工作.B为广为戳民U用凶盼引眯B.习.互们羹宽.互狈槽竺汹IAn.刊 办好杂志。必
阜阳市局 £4a 局长——_MINtkMMtgj’#lnH$B——q.M——D收束志不他只邀狲位J则【科校为先导推动地租工作.B为广为戳民U用凶盼引眯B.习.互们羹宽.互狈槽竺汹IAn.刊 办好杂志。必