千烟洲试验区湿地松人工林凋落叶及其营养元素动态分析

本文研究了千烟洲试区湿地松人工林凋落吉及其营养元素的数量动态特征。通过对该树种的凋落叶量的分析，了解了该树种的凋落叶在各个时期中的不同特征，从而进一步加深了解凋落叶在森林中的功能地位。     

吉林省稻田土壤营养元素与水稻产量的相互关系

土壤中的营养元素是土壤肥力的重要组成部分。通过对吉林省主要水稻种植区稻田土壤中的主要营养元素N、P、K及土壤理化性质进行的测试分析 ,及对其与水稻产量之间的关系的探讨表明 ,当水解氮∶速效磷∶速效钾接近 1∶0 .0 6～ 0 .0 8∶0 .4～ 0 .6时 ,水稻单产水平较高 ,这为合理施肥、提高水稻产量提供了科学依据     

土壤物理化学环境对石榴品质的影响--河北省元氏县石榴品质差异原因初探

在农业生态地质调查基础上,通过对土壤有效态元素及石榴品质的测定,对影响河北省元氏县石榴品质的土壤物理化学因素进行了分析探讨。结果表明土壤母质岩性、母岩裂隙、土壤结构对石榴品质有一定的影响。在元氏丘陵山区片麻岩土、石英片麻岩土中P、K、Mg、Fe、Mn、Zn、B、S、Mo、Na、Mg、Cu、Si有效态元素含量高,母岩裂隙及土壤结构有利于水分及养分的保持和石榴根系吸收,有利于石榴的品质。     

山东省小清河中下游地工土壤地球化学特征

经调查证实，小清河中下游地区土壤质量较好，N，P，K，Cu，Zn，Fe等元素在土壤中含量丰富，但B元素含量不足，Mo元素含量严重短缺，且有不同程度的污染，应引起足够重视。     

岩石、土壤、农作物关系浅议

表土(土壤)、母质、岩石三者之间化学组成变化很小,土壤的化学组成完全继承了母质、岩石的特性。从不同地域作物生长品质的差异的大量事例表明岩石、土壤、农作物之间关系密切。土壤养分绝大部分来自岩石,研究土壤肥力,就必须研究生长土壤的岩石。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。     

A preliminary study on the distribution characteristics of nutrients （N, P, Si, C） in the Wujiang River Basin

The distribution of nutrients (N, P, Si, C) in the Wujiang River surface water was studied during the high-flow and low-flow periods in 2002. The results showed that nitrate nitrogen (NO3-N) is the main form of dissolved inorganic nitrogen (DIN) in the Wujiang River Basin. It accounts for about 90% of DIN. The average NO3-N concentrations in the mainstream are 147.5 μM in the high-flow period and 158.0 μM in the low-flow period, respectively. The average concentrations of total phosphorus (TP) are 6.43 μM in the high-flow period and 4.18 μM in the low-flow period, respectively. Of the various forms of phosphorus, particulate phosphorus (PP) has the highest percentage ( 62.9%) of TP in the high-flow period. In the low-flow period, however, phosphate is the main form of phosphorus, which accounts for 49% of TP. With the Wujiangdu Reservoir as the boundary, the concentrations of DIN and phosphorus in the upper reaches are different from those in the lower reaches of the Wujiang River. As a whole, the concentrations of DIN and phosphorus are both higher in the low-flow period than in the high-flow period. The spatial and temporal variations of DIN and phosphorus concentrations suggested that DIN and phosphorus come from agricultural and domestic wastewaters and groundwaters and that the Wujiangdu Reservoir has an important impact on the concentrations and distribution of DIN and phosphorus in the Wujiang River. The distribution patterns of dissolved silica (DSi) and dissolved organic carbon (DOC) are similar. Both of them maintain no change in the whole course of the river and their concentrations (with the exception of the reservoir itself) are higher in the high-flow period than in the low-flow period. The average DSi and DOC concentrations in the mainstream are 85.4, 84.6 μM in the high-flow period and 60.8, 53.9 μM in the low-flow period, respectively. The concentrations of nutrients in most of the major tributaries are lower than in the mainstream. This suggested that the contributions of most tributaries are relatively small but importance should be attached to the influence of some individual tributaries such as the Qingshuijiang River and the Weng'an River on the mainstream.     

河南省南部地区生态地球化学评价

河南省南部是全国地方病多发区之一,如何改变环境条件,抑制地方病的发生与蔓延是各级政府亟待解决的问题之一。根据河南省南部地区(1:20万商城县、固始县幅)区域地球化学调查资料,对本区生态环境进行了初步评价。提供了40种元素地球化学成果资料,为生态地球化学研究提供了必要的地球化学前提。     

中东亚地区土地退化早期阶段关键营养元素C、N的差异流失作用

土地退化是导致土地生产力下降的过程之一,也是造成土地资源日益减少的主要原因.在气候变化的大背景下,人类对土地资源的过度利用正使得土地退化成为世界性难题.     

鄂尔多斯盆地上三叠统延长组长7富有机质页岩中藻类化石的发现及地质意义

鄂尔多斯盆地上三叠统延长组长7段富有机质页岩是该盆地中生界含油系统的主力烃源岩,其有机质丰度高,类型好,具有巨大的生烃潜力。该套烃源岩中有机质的富集很大程度上取决于长7期的高古生产力及其提供的充足的有机质。长7期藻类勃发的存在已被多数学者所接受,但是目前还缺乏直观、有力的证据。笔者等通过薄片和扫描电镜观察、能谱分析,在长7段的脉状黄铁矿附近和碳酸盐结核中发现了属种单一、分布丰度高的藻类化石,它们呈现出近似球状的轮廓,在中部分布着一条裂缝。这些藻类化石的发现具有重要的地质意义,它为长7期的藻类勃发提供了很好的证据,也为该时期热液活动的重要作用提供了有力的支撑。