检索结果-南通市图书馆

Nitrogen retranslocation, allocation, and utilization in bare root Larix olgensis seedlings

Journal of Forestry Research 2012年第1期23卷 87-94页

作者： WEI Hong.xu·XU Cheng-yang · MA Lii-yi · DUAN Jie Key Laboratory of Silviculture and Conservation Ministry of Educa-tion Beijing Forestry University Beijing 100083 China.

We quantified biomass accumulation and nitrogen （N） re- translocation, allocation, and utilization of Changbai larch （Larix olgen- sis） seedlings subjected to four fertilization treatments （24, 59, 81, 117 ***-1 N） with an unfertilized control during summer and autumn 2009. Ammonium phosphate （18-46-0） was the fertilizer used in all treatments. On both sampling dates, the needles had greater biomass and N content than new （2009） stems and old （2008） stems, and coarse, medium and fine roots （diameters of 〉5, 2-5 mm, and 0-2 mm, respectively）. Higher N concentration was observed in old stems and coarse roots than that in new stems and medium roots. In mid-summer, fine roots had higher N concentration than coarse roots. The treatment with 24 ***1 N had the greatest biomass and N content in needles and old stems, and highest net N retranslocation （NRA） and amount of N derived from soil. On Sep- tember 21, no N translocation was observed, while the treatment with 24 ***^-1 N had the highest N utilization efficiency and fertilizer efficiency. Vector analysis revealed that all four fertilization treatments induced Nexcess relative to the control. The treatments with 59, 81, 117 ***^-1 N induce N excess compared with treatments at 24 ***-1 N. We conclude that the traditional local fertilizer application rates exceeded N require- ments and N uptake ability for Changbai larch seedlings. The application rate of 24 ***^-1 N is recommended.

关键词： Larix olgensis Nitrogen retranslocation allocation bio-mass Vector analysis

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 Boron Nutrition on ^45Ca retranslocation and Distribution in Rape(Brassica napus L.)Cultivars

引用

Agricultural Sciences in China 2003年第3期2卷 297-303页

作者： WANGHuo－yan WANGYun－hua 等 InstituteofSoilScience ChineseAcademyofSciencesNanjing210008P.R.China DepartmentofResources EnvironmentandAgrochemistryHuazhongAgriculturalUniversityWuhan430070

Using tracer techniques with the radioisotope 45Ca, the effects of boron supply from soil and nutrient solution on the retranslocation of 45Ca from leaves to other parts of rape plants were studied. Results indicated that only a small portion of foliar-applied 45Ca could be retranslocated to other parts of the rape plant. There was no pronounced effect of boron level in the soil on 45 Ca retranslocation. Increasing boron concentrations in the nutrient solution significantly reduced 45 Ca radioactivity in root and stem, but increased 45Ca uptake and 45 Ca translocation to the upper leaves of rape plants. It was suggested that45 Ca absorbed by newly developed roots was easily distributed to upper leaves of rape plants. Boron may alter distribution of calcium via its effect on root development or growth of newly developed roots.

关键词： Boron (45)~Ca retranslocation Distribution Rape (Brassica napus L.)

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

Dry Matter Accumulation, Partitioning and Re-Translocation in Two Oat Cultivars as Affected by Irrigation in the Farming-Pastoral Zone of Northeast China

Dry Matter Accumulation, Partitioning and Re-Translocation i...

引用

第二届国际防治荒漠化科学技术大会

作者： Zhao Baoping Wu Na Zeng Zhaohai Ren Changzhong Guo Laichun Zhao Guojun Liu Jinghui Hu Yuegao Agronomy College Inner Mongolia Agricultural University College of Agronomy and Biotechnology China Agricultural University Baicheng Academy of Agricultural Sciences

To improve water management for oat production in the dry area of Jilin province, a field experiment was conducted to determine the effect of irrigation on dry matter accumulation, partitioning, re-translocation and yield. Two oat varieties, the naked "Baiyan No. 2" and the hulled "Baiyan No. 7" were subjected to three water regimes: two times irrigation, one time irrigation and no irrigation. When irrigation was applied at jointing and heading stages, the above ground biomass and re-translocation efficiency significantly increased(p < 0.05). Without irrigation, the naked oat, Baiyan No.2 had greater dry matter translocation efficiency and dry matter gain after anthesis, although grain yield did not decrease significantly. The hulled Baiyan No.7 was sensitive to water stress, with poor root development. The biomass and grain yield were significantly decreased by 51.6 and 60.5% respectively under water stress. Under conditions of west Jilin province, the naked oat, Baiyan No.2 should be preferred for dry land cultivation as it is less affected by water stress than the other cultivar. If irrigation is available both cultivars can be used but irrigation should be applied at jointing and heading stages in May or June. 1

关键词： water stress oat Avena sativa dry matter accumulation partitioning retranslocation

来源： cnki会议评论

在线全文

cnki会议

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：