Results 31 to 40 of about 552 (151)
, 2010 目的研究土荆芥生长土壤地球化学特征,为土荆芥gAP管理提供环境因素的依据。方法通过对地道药材土荆芥生长环境的实地调查,并采集其生境土壤样品进行元素分析及研究适宜的肥力条件。结果土荆芥适宜生长土壤为中性或弱碱性沙质土壤,其生长土壤肥力较高,而且分析发现其中A l2O3,k2O,n I,zn,rb,bA的含量明显高于福建省及全国土壤中的平均值,含有丰富的微量元素,nA2O,k2O含量高于非生境土壤,而A l2O3,fE2O3,CAO,TIO2低于非生境土壤,且土荆芥对P、CA有选择性的富集作用 ...
刘志红 +3 more
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Free Iron Determination in Soil by Flame Atomic Absorption Spectrometry [PDF]
Free iron oxide in soil is a product of weathering, migration, and transformation of soil parent materials. Its form, activation, and aging degree can reflect the soil forming process and environment.
Chun YANG +6 more
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Long-term straw incorporation significantly reduced subsoil organic carbon stock in cinnamon soil [PDF]
, 2020 peer ...
Xu, Hu +5 more
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Shuitu Baochi Xuebao, 2003 利用地统计学和地理信息系统相结合的方法研究了沈阳市郊耕地1991个样本0～20cm耕层土壤交换性铁含量的空间异质性特征，绘制了交换性铁含量的空间分布图，结果表明，土壤交换性铁含量基本符合正态分布，变异函数的最佳理论模型为球状模型，交换性铁含量具有中等的空间相关性（Co与Co C比值为41.3%，空间自相关距离为34.9km），Kriging内插图显示出交换性铁具有较强的空间质异性，其空间异质性主要受成土母质，成土过程和土壤类型等结构性因子的影响。
姜勇 张玉革 等
doaj +2 more sources
Shuitu Baochi Xuebao, 2006 试验分析研究了山西省小麦主产区之一——运城市土壤中钴的含量状况及其影响因素。研究结果表明。运城市4县区土壤全钴含量为1.65～17．85mg／kg，平均6．00mg／kg，略高于缺钴临界值5．0mg／kg，而低于全国平均值11．2mg／kg;土壤有效钴含量为0．060～2．235mg／kg,平均0．694mg／kg。在34个土样中，大约有60％的样品有效钴含量低于均值．而含量高于均值的土样仅占总样品数的40％。试验区主要土类褐土和潮土全钴含量分别为6．17mg／kg和4．73mg／kg ...
樊文华 +6 more
doaj
Genetic Types and Ecological Potential of Selenium-Enriched Land in the Northern Margin of the Qinghai—Xizang Plateau [PDF]
The study of the genesis type of selenium (Se)-enriched land found in the Qinghai—Xizang Plateau can provide a scientific basis for the construction of the research, development and utilization system of Se resources on the Qinghai—Xizang Plateau and has
Bingyan JI +6 more
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Shuitu Baochi Xuebao, 2016 采集广东省主要成土母质（玄武岩、砂页岩、第四纪红土和花岗岩）发育的林地、耕地和园地土壤剖面各发生层土壤，测定了土壤颗粒组成、有机质、CEC等理化性质，探讨了不同母质发育土壤颗粒分布的分形维数特征及其与土壤理化性质的关系。结果表明，玄武岩、第四纪红土、花岗岩和砂页岩发育土壤分形维数变幅分别为2.923 9～2.981 2，2.858 8～2.937 7，2.769 3～2.923 1和2.544 6～2.885 6；玄武岩和第四纪红土发育土壤颗粒分布分形维数与砂页岩发育土壤存在显著差异 ...
姜 坤 +5 more
doaj
Study on Microbe Mediated Transformation of Cr/As in Sediments of the Mining Area [PDF]
, 2013 目前我国很多地方都受到重金属铬（Cr）或砷（As）的严重污染，给人类健康和生存环境带来很大威胁，这也成为全球较严重的环境问题。本研究以云南曲靖铬渣堆周边污染沉积物和湖南石门雄黄矿废弃矿区周边砷污染沉积物为研究对象，研究典型低分子有机碳对沉积物中Cr/As形态转化的影响，并利用PCR-DGGE和Real-TimePCR分析沉积物中微生物群落结构和功能微生物的丰度；利用稳定性同位素核酸探针技术（DNA-SIP）分析了乙酸钠作为底物情况下，硫酸盐还原菌（SRB）数量的变化 ...
龚丽博
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Researches on Chemical Behavior and Influencing Factors of Heavy Metals in Soil and Corps of Xiang’an, Xiamen [PDF]
, 2007 翔安区是厦门市主要农作物生产基地。本文通过采用电热板消解法对土壤样品进行消解，并用ICP-MS测定其中重金属含量，测得金属含量范围和平均值分别为：Zn(45.520~229.080mg/kg,153.800mg/kg),Pb(24.372~111.504mg/kg,73.258mg/kg),Cr(6.249~134.400mg/kg,48.504mg/kg),As(5.783~56.052mg/kg,27.092mg/kg),Cu(4.573~46.032mg/kg,18.399mg/kg),Ni(1 ...
黄智伟
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Migration Characteristics and Environmental Quality Assessment of Heavy Metal Elements in the Rock-Soil System in Qiongzhong, Hainan Island [PDF]
The rock-soil system is an important component of the Earth’s critical zone, but there are few detailed studies on different soil systems in Hainan Island.
Hongkun ZHAO +6 more
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