检索结果-南通市图书馆

The rhizosphere pH change of Pinus koraiensis seedlings as affected by n sources of different levels and its effect on the availability and uptake of Fe, Mn, Cu and Zn

引用

Journal of Forestry Research 2002年第1期13卷 37-40,83页

作者：陈永亮韩士杰周玉梅程国玲中科院应用生态研究所沈阳110016 东北林业大学哈尔滨150040

Dark brown forest soil was collected from the upper 20 cm soil layer in Changbai Mountain Research Station of Ecosystem, Chinese Academy of Sciences. The soil was amended with two different forms of nitrogen fertilizers: nO3- as Ca(nO3)2, nH4+ as nH4Cl at the concentrations of 50, 100, 200 and 400 mgkg-1 respectively. The experiment was carried out with 2-yr-old Pinus koraiensis seedlings in pot. The pH change of rhizosphere soil and the contents of available Fe, Mn, Cu, and Zn in soil and leaves were analyzed. The result indicated that the addition of nH4--n decreased the rhizosphere pH value, while the addition of nO3--n increased the rhizosphere pH value in contrast with the control treatment. The direction and extent of the pH change mainly depended on n source and its concentrations applied. The rhizosphere pH change had a remarkable influence on the availability of the micronutrients in the rhizosphere, and thereafter affected the nutrient uptake by the seedlings. The contents of available mineral nutrients had a negative correlation with the pH value in the rhizosphere soil. The contents of available mineral nutrients in leaves were positively correlated to the levels of the available nutrients in the rhizosphere soils.

关键词： Rhizosphere pH n sources Micronutrient Availability Uptake

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of nitrogen specification and culture method on growth of Enteromorpha prolifera

引用

Chinese Journal of Oceanology and Limnology 2011年第4期29卷 874-882页

作者：李俭平赵卫红 Key Laboratory of Marine Ecology & Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Graduate University of Chinese Academy of Sciences

Eutrophication, which is the enrichment of a water mass with inorganic and organic nutrients that support plant growth, is a key factor in stimulating phytoplankton growth. In this study, we determined the effects of various nitrogen sources, different nitrogen concentrations in the culture medium, and two culture methods on the growth of the green alga, Enteromorpha prolifera. The relationship between the specific growth rate of E. prolifera and nO3-n concentration was consistent with that estimated using the Monod equation （R2=0.9713, P〈0.01）. In the n O3-n medium, the maximum specific growth rate was calculated to be 0.1634/d and the semi-saturation constant was calculated to be 16.86 μmol/L. Our results show that E. prolijkra can effectively utilize nH4^＋-n, nO3^-n, and nO^2-n and urea-n in the range of 5 to 50 μmol/L. nH4^＋-n was preferentially assimilated by E. prolifera, and urea-n was favorable for long-term growth.

关键词： eutrophication n concentrations n sources culture methods E. prolifera

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Behaviour of Potassium and Trace Elements in Rhizosphere of Flue-Cured Tobacco (nicotiana Tabacum L.)

引用

Pedosphere 1993年第3期3卷 207-220页

作者： HUGUO－SOnG CAOZHI－HOnG 等 InstituteofSoilScience AcademiaSinicaP.O.Box821Nanjing210008（China） InstituteofSoilScience Academia

The study on the behaviourof potassium, phosphate and trace elements, Fe, Mn, Cu and Zn, in the rhizosphere of different varieties of flue-cured tobacco (nicotiana tabacum L.) with high and low potassium application rate with rhizobag technique showed that soil available K, soil available P, and slow available K was in depletion status, whereas DTPA extractable Fe, Mn, Zn and Cu accumulated obviously in rhizosphere. The depletion and accumulation rates of mineral nutrients differed in degree with K application rate, soil type, and tobacco variety. The content of a vailable K in both rhizosphere and bulk soil and K concentration in tobacco leaf increased significantly, and the available P in rhizosphere dropped with more K applicatin. The DTPA-Fe content of red soil much lower in pH was higher than that of calcareous soil in bulk soil. But the DTPA-Fe content of calcareous soil was much higher than that of red soil in rhizosphere, which was considered perhaps to be mainly related to releasing of Fe phytosiderophore. nitrate could increase depletion of available K in rhizosphere and also soil pH in comparison with ammonium.

关键词： Fe activation flue-cured tobacco mineral nutrients n sources rhizosphere

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：