检索结果-南通市图书馆

Effects of water application intensity of microsprinkler irrigation on water and salt environment and crop growth in coastal saline soils

引用

Journal of Integrative Agriculture 2015年第10期14卷 2077-2089页

作者： CHU Lin-lin KANG Yao-hu wan shu-qin National Research Center of Pumps Jiangsu University Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Science and Natural Resources Research Chinese Academy of Sciences

Laboratory and field experiments were conducted to investigate the effects of water application intensity（WAI） on soil salinity management and the growth of Festuca arundinacea（festuca） under three stages of water and salt management strategies using microsprinkler irrigation in Hebei Province, North China. The soil water content（è） and salinity of homogeneous coastal saline soils were evaluated under different water application intensities in the laboratory experiment. The results indicated that the WAI of microsprinkler irrigation influenced the è, electrical conductivity（ECe） and p H of saline soils. As the WAI increased, the average values of è and ECe in the 0–40 cm profile also increased, while their average values in the 40–60 cm profile decreased. The p H value also slightly decreased as depth increased, but no significant differences were observed between the different treatments. The time periods of the water redistribution treatments had no obvious effects. Based on the results for è, ECe and p H, a smaller WAI was more desirable. The field experiment was conducted after being considered the results of the technical parameter experiment and evaporation, wind and leaching duration. The field experiment included three stages of water and salt regulation, based on three soil matric potentials（SMP）, in which the SMP at a 20-cm depth below the surface was used to trigger irrigation. The results showed that the microsprinkler irrigation created an appropriate environment for festuca growth through the three stages of water and salt regulation. The low-salinity conditions that occurred at 0–10 cm depth during the first stage（-5 k Pa） continued to expand through the next two stages. The average p H value was less than 8.5. The tiller number of festuca increased as SMP decreased from the first stage to the third stage. After the three stages of water and salt regulation, the highly saline soil gradually changed to a low-saline soil. Overall, based on the salt desa

关键词： coastal saline soil microsprinkler irrigation water application intensity soil salinity water and salt regulation reclamation

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

Effect of different water application intensity and irrigation amount treatments of microirrigation on soil-leaching coastal saline soils of North China

引用

Journal of Integrative Agriculture 2016年第9期15卷 2123-2131页

作者： CHU Lin-lin KANG Yao-hu wan shu-qin Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China Ministry of Education/College of Water Conservancy and Hydropower Engineering Hohai University Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Science and Natural Resources Research Chinese Academy of Sciences

In coastal regions, Bohai Gulf is one of the most affected areas by salinization. To study the effects of mocrosprinkler irrigation on the characteristics of highly saline sandy loam soil（ECe（saturated paste extract）=22.3 d S m^–1; SAR（sodium adsorption ratio）=49.0） of North China, a laboratory experiment was conducted. Five water application intensity（WAI） treatments（1.7, 3.1, 5.3, 8.8, and 10.1 mm h^–1）, five irrigation amount（IA） treatments（148, 168, 184, 201, and 223 mm） and three time periods of water redistribution（0, 24 and 48 h） were employed in the study. A compounding microsprinkler system was used for the WAI treatments, and a single microsprinkler was used for the IA treatments. The results indicated that, as soil depth increased, soil water content（θ） increased and then slightly decreased; with WAI and IA consistently increasing, the relatively moist region expanded and the average θ increased. Meanwhile, soil ECe increased as soil depth increased, and the zone with low soil salinity expanded as WAI and IA increased. Although the reduction of the average SAR was smaller than that of the average electrical conductivity of the ECe, these variables decreased in similar fashion as WAI and IA increased under microsprinkler irrigation. The average p H decreased as soil depth increased. Longer time periods of water redistribution led to lower salinity and slight expansion of the SAR zone. Considering the effects of leached salts in coastal saline soils, greater WAI and IA values are more advantageous under unsaturated flow conditions, as they cause better water movement in the soil. After leaching due to microsprinkler irrigation, highly saline soil gradually changes to moderately saline soil. The results provide theoretical and technological guidance for the salt leaching and landscaping of highly saline coastal environments.

关键词： coastal saline soil microsprinkler irrigation SAR reclamation

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

Soil Salinity Changes Under Cropping with Lycium barbarum *** Irrigation with Saline-Sodic Water

引用

Pedosphere 2011年第4期21卷 539-548页

作者： DOU Chao-Yin KANG Yao-Hu wan shu-qin HU Wei Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 (China) Graduate University of Chinese Academy of Sciences Beijing 100049 (China)

In order to utilize the wasted saline-sodic soils under shallow groundwater condition, a 3-year field study was carried in a field cropped with Lycium barbarum L. and irrigated by drip irrigation with saline groundwater under the water table depth of 30-40 cm in the northern Yinchuan Plain, China. Effects of cropping duration （one, two, and three years） on soil salinity, soil solution composition, and pH in three adjacent plots were investigated in 2008. Results showed that a high irrigation frequency maintained high soil water potential and subsequently facilitated infiltration and downward movement of water and salt in the crop root zone. Salt accumulated on the edges of the ridges, and soil saturated-paste electrical conductivity （ECe） was higher in the edge. Concentrations of Na^＋, Ca^2＋, Mg^2＋, Cl^-, and SO24^- in the soil increased with the soil depth as did the ECe, while HCO3 and pH had a relative uniform distribution in soil profile. As planting year increased, the ECe and soil salts in the field had a decreasing tendency, while in the root zone they decreased immediately after irrigation and then remained relatively stable in the following growing seasons. HCO3 and pH had little change with the planting year. Results suggested that the application of drip irrigation with saline water could ameliorate saline-sodic soil and provide a relatively feasible soil environment for saline-sodic soils with shallow groundwater.

关键词： water table the growth of salt-tolerant plant Lycium barbarum L. under the salt accumulation saturated-paste electrical conductivity (ECe) shallow groundwater soil water potential depth

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

Comparison of Two Dripper Line Designs to Assess Cotton Yield,Water Use,and Net Return in Northwest China

引用

Journal of Integrative Agriculture 2012年第11期11卷 1924-1932页

作者： wanG Ruo-shui wan shu-qin KANG Yue-hu LIU Shi-ping Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Science and Natural Resources Research Chinese Academy of Sciences Beijing 100101 P.R.China University of Chinese Academy of Sciences Beijing 100049 P.R. China

This study aimed to compare the effects of two types of drip irrigation line design on cotton yield, water use, and net returns. The experiments were carried out in the arid region of Xinjiang, Northwest China, during 2009-2010 growing years. The two types of lateral placement are commonly used by the local farmers in the area： double lines （two laterals controlling four rows） and single line designs （one lateral controlling four rows）. The results indicated that less irrigation water was applied by single line compared with double lines design. This implies that more irrigation water could be saved using single line, by reducing the water consumption of cotton. The emergence rates for double lines were 2 and 6% higher than those for single line design in 2009 and 2010. The seed cotton yields for double lines design were 5.76 and 6.41 Mg ha-1 which were 13 and 9% higher than for single line design in 2009 and 2010, respectively. Single lines could however lower the investment cost compared to double lines, which produced 10 and 7% more net income in 2009 and 2010, respectively. By contrast, the double lines was more profitable and suitable for the farmers in Northwest China than single line design.

关键词： drip irrigation lateral layout economic benefit water saving water use efficiency (WUE)

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 signal regulatory proteinα1 on proliferation of hepatocellular carcinoma: a preliminary study

引用

Hepatobiliary & Pancreatic Diseases International 2005年第2期4卷 244-248页

作者： Jian-Min qin, He-Xin Yan, Xing-wang wan, shu-qin Liu, Jin-Zhang Zeng, Hui-Fang Cao, Meng-Chao Wu and Hong-Yang wang Shanghai, China International Cooperative Laboratory on Signal Trans- duction, Eastern Hepatobiliary Surgery Institute, Second Military Medical University, Shanghai 200438, China International Cooperative Laboratory on Signal Transduction Eastern Hepatobiliary Surgery Institute Second Military Medical University Shanghai 200438 China. jianminqin@***

BACKGROUND: Signal regulatory protein alpha1 (Sirpα1) is a negative regulatory factor, and inhibits receptor tyro- sine kinase-dependent cell proliferating signal. This study was undertaken to observe the effect of signal regulatory proteinα1 ( Sirpα1) on gankyrin, cyclin D1, CDK4 and Fas expression in Sk-hep1 mouse hepatoma carcinoma cell line. METHODS: BOSC 23 packed cells were respectively trans- fected by means of recombinated retrovirus including pLX- SN, pLXSN-Sirpα1 and pLXSN-Sirpα1Δ4Y2 with lipofec- tin, and various plasmid virus media (viral titer 2.1 × 106 CFU/ml) were collected and infected respectively in 80% confluent Sk-hepl cells. Transfected Sk-hep1 cells were se- lectively screened with G418 (1200 μg/ml), and Sk-hep1 cell lines transfected with various plasmids were obtained. The protein expressions of gankyrin, cyclin D1, CDK4 and Fas in various Sk-hep1 lines were determined by Western blotting. Various Sk-hep1 lines were recovered to culture with 10% fetal bovine serum at 12 hours and 24 hours after starving culture with free serum for 72 hours, and cells were collected to determine the percentage of S phase cells of proliferating cycle by flow cytometry. RESULTS: Sirpα1 transfection remarkably downregulated gankyrin and cyclin D1 expression. Sirpα1Δ4Y2 downregu- lation of gankyrin expression was greater than that of Sirpα1(P 0.05). The per- centage of S phase cells significantly decreased in Sk-hep1 cells transfected with Sirpα1 and Sirpα1Δ4Y2 plasmids (vs pLXSN Sk-hep1, P <0.05). The percentage of S phase cells in various Sk-hep1 cells increased when recovering to culture with 10% fetal bovine serum at 12 hours, but the percentage of S phase cells in Sk-hep1 cells transfected with Sirpα1 was the lowest ( vs pLXSN and Sirpα1Δ4Y2 Sk- hepl, P<0.05). The percentage of S phase cells in trans- fected pLSXN Sk-he

关键词： hepatocellular carcinoma signal regulatory proteinα1 proliferation regulatory control effective mechanism

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

无回溯并行多路径搜索测试向量生成算法

引用

计算机应用 2010年第5期30卷 1390-1393页

作者：黄越于宗光万书芹江南大学信息工程学院江苏无锡214122 中国电子科技集团公司第五十八研究所江苏无锡214035

无回溯并行多路径搜索算法(NBMP)在生成测试向量过程中生成基于原始输入端奇异立方和与原始输出端关联的传输立方,并利用生成的奇异立方和传输立方生成测试向量。算法在实现过程采用无须回溯和多路径探索策略。通过分析和实验结果证明... 详细信息

无回溯并行多路径搜索算法(NBMP)在生成测试向量过程中生成基于原始输入端奇异立方和与原始输出端关联的传输立方,并利用生成的奇异立方和传输立方生成测试向量。算法在实现过程采用无须回溯和多路径探索策略。通过分析和实验结果证明算法时间复杂度近似为线性。算法对ISCAS85基准电路中规模最大的8个电路进行实验,将实验结果与传统算法进行比较,结果表明NBMP算法故障覆盖率优于传统算法。

关键词：数字电路基准电路测试向量生成故障覆盖率多路径

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

低洼重度盐碱地滴灌水盐调控的环境效应

引用

干旱地区农业研究 2019年第1期37卷 1-10页

作者：万书勤孙甲霞董世德康跃虎中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室北京100101 中国科学院大学资源与环境学院北京100049

采用"咸水滴灌+高垄+覆膜"水盐调控技术模式,开发利用河套灌区水平排水困难的低洼重度盐碱撂荒地时,研究了该区浅层地下水埋深、浅层地下水电导率(ECw)、潜水层地下水电导率(ECi)、土壤饱和泥浆提取液电导率(ECe)、枸杞成活率和保存率... 详细信息

采用"咸水滴灌+高垄+覆膜"水盐调控技术模式,开发利用河套灌区水平排水困难的低洼重度盐碱撂荒地时,研究了该区浅层地下水埋深、浅层地下水电导率(ECw)、潜水层地下水电导率(ECi)、土壤饱和泥浆提取液电导率(ECe)、枸杞成活率和保存率等的变化。结果表明:研究区浅层地下水埋深、ECw和ECe明显受周边和研究区灌溉、降雨等的影响;随着枸杞种植年限的延长及植株蒸腾耗水的增加,整个研究区的浅层地下水埋深、ECw、ECi及ECe均逐年降低,0～40 cm土层土壤由极重度盐土转变为重度盐土;该技术模式下,枸杞成活率达到75.4%,保存率达到67.5%。即可以采用"咸水滴灌+高垄+覆膜"滴灌水盐调控技术模式,通过种植枸杞等耐盐碱的多年生林果,来开发利用传统方法难以有效开发利用的地下水浅埋且地下水为咸水的重度盐碱地,通过枸杞生长耗水可以显著降低整个区域的地下水位埋深,ECw和ECe也逐年降低。

关键词：低洼盐碱地地下水浅埋区浅层地下水埋深地下水电导率潜水层地下水电导率土壤饱和泥浆提取液电导率

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

松嫩平原盐碱草地主要植物群落土壤酶活性研究

引用

土壤 2012年第4期44卷 601-605页

作者：刘淑慧康跃虎万书勤张体彬中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室北京100101 太原理工大学水利科学与工程学院太原030024

采用现场采样及室内测试方法,研究了松嫩平原盐碱草地主要植物群落羊草(Leymus chinensis)、芦苇(Phragmites australis)、虎尾草(Chloris virgata)、碱茅(Puccinellia tenuiflora)、碱蓬(Suaeda glauca)以及盐碱荒地上土壤磷酸酶、脲酶和蔗糖酶的酶活性值以及垂直分布规律,并对3种酶活性与各理化因子之间进行了相关分析。结果表明:羊草群落的磷酸酶、脲酶、蔗糖酶活性值均为最高,芦苇、虎尾草群落土壤的酶活性值也较高,碱茅群落的土壤酶活性较低,而碱蓬群落土壤酶活性值最低,接近于盐碱荒地上土壤酶活性值。各植物群落的土壤酶活性垂直分布多表现为随着土壤深度的加深而呈现依次递减的规律,且表层(0～10 cm)土壤酶活性在所有根层总酶活性中所占的比例最大,占根层(0～40 cm)土壤酶活性的50%以上。土壤酶与土壤理化因子相关分析表明,土壤的土壤酶活性大多与EC、pH值显著负相关,对土壤酶活性影响较大;土壤酶活性与土壤养分正相关,脲酶与其相关性较大,蔗糖酶与养分的相关关系不是很明显。

关键词：土壤酶活性盐碱草地土壤环境松嫩平原

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

中国地下水资源对区域经济社会发展的支撑作用评价

引用

资源科学 2007年第5期29卷 97-104页

作者：杨建锋万书勤陈兴华中国地质调查局发展研究中心北京100083 中国科学院地理科学与资源研究所北京100101

在我国各地区经济社会发展过程中,地下水资源所起的支撑作用是有明显差异的。对地下水资源所起的支撑作用进行定量评价,不仅可以直观地测度地下水的重要性,而且能够为水文地质调查宏观部署提供基础依据。通过构建地下水资源支撑度评价... 详细信息

在我国各地区经济社会发展过程中,地下水资源所起的支撑作用是有明显差异的。对地下水资源所起的支撑作用进行定量评价,不仅可以直观地测度地下水的重要性,而且能够为水文地质调查宏观部署提供基础依据。通过构建地下水资源支撑度评价指标体系,对我国各省(自治区、直辖市)地下水对经济社会发展的支撑作用进行了初步评价。结果表明:地下水资源支撑度最高的10个省份依次是山西、北京、河北、内蒙古、山东、河南、宁夏、贵州、陕西和辽宁;地下水资源支撑度最低的5个省份是江西、湖南、福建、浙江和上海;从区域来说,地下水资源支撑度最高的是黄淮海地区、鄂尔多斯高原与银川河套平原区、黄土高原东部地区及贵州省,其次是东北地区和西北地区,东南沿海地区最低。根据评价结果,对我国区域水文地质调查宏观部署提出了若干建议。

关键词：地下水经济社会区域可持续性指标体系

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

整枝和滴灌灌溉制度对番茄产量品质和耗水的影响

引用

节水灌溉 2013年第5期 17-21页

作者：万书勤康跃虎蒋树芳刘士平中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室北京100101

无限生长型番茄的整枝和水分管理是影响其产量和品质的主要措施之一。在2年的田间试验中发现,在我国华北半湿润地区番茄露地生产中,当保留4层花果序时,可以在番茄第1、第2层穗果的果实如鸡蛋大小时,将第1、第2层穗果下部的枝叶全部去掉... 详细信息

无限生长型番茄的整枝和水分管理是影响其产量和品质的主要措施之一。在2年的田间试验中发现,在我国华北半湿润地区番茄露地生产中,当保留4层花果序时,可以在番茄第1、第2层穗果的果实如鸡蛋大小时,将第1、第2层穗果下部的枝叶全部去掉,仅保留第3和第4层穗果的主枝叶进行光合作用;并且在番茄缓苗后,可控制滴头正下方0.2m深度土壤基质势的下限高于-50kPa。这种番茄整枝和滴灌灌溉制度不影响番茄的产量,并且提高了果实中可溶性糖和蛋白质的含量,减少灌水量和耗水量,而且还可以提高番茄的水分利用效率和灌溉水利用效率。

关键词：番茄滴灌整枝方式土壤基质势灌溉计划

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

在线全文

在线全文

在线全文

在线全文

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

在线全文

在线全文

在线全文

在线全文

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：