Relationships between seed yields of oilseed rape (Brassica napus L.) and extractable boron concentrations in three soil layers (A, P and W) were investigated through ten experiments on three types of soils (Alluvic E...Relationships between seed yields of oilseed rape (Brassica napus L.) and extractable boron concentrations in three soil layers (A, P and W) were investigated through ten experiments on three types of soils (Alluvic Entisols, Udic Ferrisols and Stagnic Anthrosols) in northern, western and middle Zhejiang Province. Among several mathematical models used to described the relationships, the polynomial equation, y = a + bx + cx2 + dx3, where y is the yield of oilseed rape seed and x the extractable boron concentration in P layer of soil, was the best one. The critical range of the concentrations corresponding to 90% of the maximum oilseed rape yield was 0.40-0.52 mg kg-1. The extractable boron concentration of the P layers of the soils was the most stable. The critical range determined was verified through the production practices of oilseed rape in Zhejiang and Anhui provinces.展开更多
Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnet...Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnetic susceptibility,pH value distribution,loss on ignition and particle-size distribution.It was concluded that the dust source of loess in the upper reaches of the Huaihe River Basin was different from that in the Loess Plateau.And the Holocene pedogenic environmental changes in the upper reaches of the Huaihe River Basin were revealed.展开更多
Facing the innovation technology in building construction, the designer has the option in selecting the type of system construction and building materials. There is a big question for the designer and owner on how to ...Facing the innovation technology in building construction, the designer has the option in selecting the type of system construction and building materials. There is a big question for the designer and owner on how to evaluate the quality material to meet the technical requirements as building construction reliability. By demand to provide a low cost house, there is need for improving structure model and material construction for residents. When material cost takes 60%-70% of total construction cost, it is important to select the appropriate building material. Currently the innovation of material building for main frame and wall component has present for residential projects in Indonesia. Attempt to replace the traditional material such as brick or pozzolan lime concrete block is developed a new material include utilization of coal combustion waste for concrete block, lightweight concrete, or prefab panel wall. This paper presents the research result to develop a tool support for material and system construction selecting that facilitates the selection an optimal material for a simple house construction. A multi-criteria decision method is used based on performance criteria such as economy, reliability, comfort and eco-friend.展开更多
【目的】黄土高原区沟坝地经过人工筑坝后自然淤积或者拦蓄洪水淤积而形成坝淤土,为了解坝淤土的发生特性及系统分类归属开展研究。【方法】为本文选取5个典型坝淤土剖面,分析坝淤土的成土环境、剖面形态特征理化性质,检索坝淤土在中国...【目的】黄土高原区沟坝地经过人工筑坝后自然淤积或者拦蓄洪水淤积而形成坝淤土,为了解坝淤土的发生特性及系统分类归属开展研究。【方法】为本文选取5个典型坝淤土剖面,分析坝淤土的成土环境、剖面形态特征理化性质,检索坝淤土在中国土壤系统分类高级及基层分类的归属。【结果】坝淤土剖面土体深厚,成土母质为人为淤积物质,色调以浊黄橙为主,土壤质地为粉质壤土、壤土和砂质壤土,有机碳含量在1.33~8.29 g kg^(−1),pH为8.40~9.80,CaCO_(3)含量为19.4~173.5 g kg^(−1)。供试剖面包含淡薄表层、雏形层2个诊断层和盐积现象1个诊断现象,以及人为淤积物质、温性土壤温度状况、半干润土壤水分状况、湿润土壤水分状况、氧化还原特征和石灰性等6个诊断特性;供试5个坝淤土剖面分别被检索为普通简育干润雏形土(61-134),弱盐淤积人为新成土(61-129)、斑纹淤积人为新成土(61-012)、石灰淤积人为新成土(61-125、61-133)4个亚类,建立了5个土系。所建立的5个土系在发生分类系统下的参比土种均为坝淤绵土,表明系统分类对于坝淤土的分类更具有区分度。【结论】尽管坝淤土成土时间较短,但人为耕作、灌溉等农业生产措施可以促进土壤发育,加速由新成土发育为雏形土。坝淤土发生特性差异明显,土族和土系类型多样,应因地制宜的充分利用和合理保护不同土系,以促进黄河流域生态环境和农业生产高质量发展。展开更多
基金the Australian Center for international Agricultural Research (No. 9120) and theZhejiang Provincial Government (No. 94222).
文摘Relationships between seed yields of oilseed rape (Brassica napus L.) and extractable boron concentrations in three soil layers (A, P and W) were investigated through ten experiments on three types of soils (Alluvic Entisols, Udic Ferrisols and Stagnic Anthrosols) in northern, western and middle Zhejiang Province. Among several mathematical models used to described the relationships, the polynomial equation, y = a + bx + cx2 + dx3, where y is the yield of oilseed rape seed and x the extractable boron concentration in P layer of soil, was the best one. The critical range of the concentrations corresponding to 90% of the maximum oilseed rape yield was 0.40-0.52 mg kg-1. The extractable boron concentration of the P layers of the soils was the most stable. The critical range determined was verified through the production practices of oilseed rape in Zhejiang and Anhui provinces.
基金National Natural Science Foundation of China,No.40571154No.40471119
文摘Based on field surveys,soil samples were collected at the YPC site,Yuzhou City,Henan Province for analysis of contents of major and trace elements and their variations with XRF and comparison with the curves of magnetic susceptibility,pH value distribution,loss on ignition and particle-size distribution.It was concluded that the dust source of loess in the upper reaches of the Huaihe River Basin was different from that in the Loess Plateau.And the Holocene pedogenic environmental changes in the upper reaches of the Huaihe River Basin were revealed.
文摘Facing the innovation technology in building construction, the designer has the option in selecting the type of system construction and building materials. There is a big question for the designer and owner on how to evaluate the quality material to meet the technical requirements as building construction reliability. By demand to provide a low cost house, there is need for improving structure model and material construction for residents. When material cost takes 60%-70% of total construction cost, it is important to select the appropriate building material. Currently the innovation of material building for main frame and wall component has present for residential projects in Indonesia. Attempt to replace the traditional material such as brick or pozzolan lime concrete block is developed a new material include utilization of coal combustion waste for concrete block, lightweight concrete, or prefab panel wall. This paper presents the research result to develop a tool support for material and system construction selecting that facilitates the selection an optimal material for a simple house construction. A multi-criteria decision method is used based on performance criteria such as economy, reliability, comfort and eco-friend.
文摘【目的】黄土高原区沟坝地经过人工筑坝后自然淤积或者拦蓄洪水淤积而形成坝淤土,为了解坝淤土的发生特性及系统分类归属开展研究。【方法】为本文选取5个典型坝淤土剖面,分析坝淤土的成土环境、剖面形态特征理化性质,检索坝淤土在中国土壤系统分类高级及基层分类的归属。【结果】坝淤土剖面土体深厚,成土母质为人为淤积物质,色调以浊黄橙为主,土壤质地为粉质壤土、壤土和砂质壤土,有机碳含量在1.33~8.29 g kg^(−1),pH为8.40~9.80,CaCO_(3)含量为19.4~173.5 g kg^(−1)。供试剖面包含淡薄表层、雏形层2个诊断层和盐积现象1个诊断现象,以及人为淤积物质、温性土壤温度状况、半干润土壤水分状况、湿润土壤水分状况、氧化还原特征和石灰性等6个诊断特性;供试5个坝淤土剖面分别被检索为普通简育干润雏形土(61-134),弱盐淤积人为新成土(61-129)、斑纹淤积人为新成土(61-012)、石灰淤积人为新成土(61-125、61-133)4个亚类,建立了5个土系。所建立的5个土系在发生分类系统下的参比土种均为坝淤绵土,表明系统分类对于坝淤土的分类更具有区分度。【结论】尽管坝淤土成土时间较短,但人为耕作、灌溉等农业生产措施可以促进土壤发育,加速由新成土发育为雏形土。坝淤土发生特性差异明显,土族和土系类型多样,应因地制宜的充分利用和合理保护不同土系,以促进黄河流域生态环境和农业生产高质量发展。
