检索结果-南通市图书馆

soil Insect Diversity and Abundance Following Different Fertilizer Treatments on the loess Plateau of China

Journal of Integrative Agriculture 2013年第9期12卷 1644-1651页

作者： LIN Ying-hua LU Ping YANG Xue-yun ZHANG Fu-dao Institute of Wetland Research Chinese Academy of Forestry Key Laboratory of Forest Protection of State Forestry Administration Research Institute of Ecology Environment and ProtectionChinese Academy of Forestry College of Resources and Environmental Sciences Northwest A&F University Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences

The presence of abundant and diverse communities of macro-arthropods is considered an indicator of sustainability in agroecosystems. This study was designed to investigate the effects of different fertilizer treatments on abundance and diversity of insects of arable loess soil on the loess Plateau of China. These regimes included a control with no fertilizer addition or manure, treatments with application of mineral fertilizers （N, NK, NP, PK, NPK）, treatments with NPK in combination with organic materials such as wheat straw or maize stalk, treatments with two rates of organic manure application; and different crop rotations （Rot. 1： winter wheat summer maize; Rot.2： winter wheat summer maize soybean intercropping; and Rot.3： winter wheat or rapeseed summer maize soybean intercropping）. soil macro-arthropods were collected from the plough layer （0-20 cm） and sorted by hand after each harvest in June and October 2001 and 2002. A total of 3 132 individuals were collected, from 7 orders and 55 families, dominated by Formicidae （61.72%） and Staphylinidae （14.24%）. The results showed that individuals and groups were significantly influenced by sampling dates, while groups were significantly influenced by the fertilization treatments. soil insect biodiversity, as determined by the Shannon index, was significantly influenced by fertilization and sampling dates. The abundance of soil insects was positively and significantly correlated with soil moisture content in October 2002. Nitrogen, phosphorus and potassium fertilizers and incorporation of organic materials were favorable factors for abundance and diversity in arable loess soil.

关键词： long-term fertilization soil moisture soil insect loess soil

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

Solute transport characteristics of a deep soil profile in the loess Plateau,China

引用

Journal of Arid Land 2018年第4期10卷 628-637页

作者： WANG Jiao SHAO Ming'an Key Laboratory of Ecosystems Network Observation and Modeling Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of soil Erosion and Dryland Farming on the loess Plateau Northwest A&F UniversityYangling 712100China

Understanding solute transport behaviors of deep soil profile in the loess Plateau is helpful for ecological construction and agricultural production improvement. In this study, solute transport processes of a deep soil profile were measured by a conservative tracer experiment using 25 undisturbed soil cores （20 cm long and 7 cm diameter for each） continuously sampled from the surface downward to the depth of 500 cm in the loess Plateau of China. The solute transport breakthrough curves （BTCs） were analyzed in terms of the convection-dispersion equation （CDE） and the mobile-immobile model （MIM）. Average pore-water velocity and dispersion coefficient （or effective dispersion coefficient） were calculated using the CDE and MIM. Basic soil properties and water infiltration parameters were also determined to explore their influence on the solute transport parameters. Both pore-water velocity and dispersion coefficient （or effective dispersion coefficient） generally decreased with increasing depth, and the dispersivity fluctuated along the soil profile. There was a good linear correlation between log-transformed pore-water velocity and dispersion coefficient, with a slope of about 1.0 and an average dispersivity of 0.25 for the entire soil profile. Generally speaking, the soil was more homogeneous along the soil profile. Our results also show that hydrodynamic dispersion is the dominant mechanism of solute transport of loess soils in the study area.

关键词： solute transport loess soil pore-water velocity dispersion coefficient hydraulic conductivity loess Plateau

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 rye grass coverage on soil loss from loess slopes

引用

International soil and Water Conservation Research 2015年第3期3卷 170-182页

作者： Yuequn Dong Tingwu Lei Shuqin Li Cuiping Yuan Shumei Zhou Xiusheng Yang College of Water Resources and Civil Engineering China Agricultural UniversityBeijing100083China Agricultural Clear Watershed Group Institute of Agro-environment and Sustainable DevelopmentCAASBeijing 100081China State Key Laboratory of soil Erosion and Dryland Farming on the loess Plateau Institute of Soil and Water ConservationChinese Academy of Science and Ministry of Water ResourcesYanglingShaanxi 712100China Beijing Grandtopeak Tianpinghang Land Plan and Design Co. Ltd.Beijing 100081China e School of Eonomics and Management Hebei University of Science and TechnologyShijiazhuang050018China University of Connecticut Department of Natural Resources and the EnvironmentStorrs 06269 United States

Vegetative coverage is commonly used to reduce urban slope soil *** experimental study on soil erosion under grass covered slopes is conventionally time and space *** this study,a new method is suggested to study the influences of vegetation coverage on soil erosion from a sloped loess surface under three slope gradients of 51,151,and 251;four rye grass coverages of 0%,25%,50%,and 75%;and three rainfall intensities of 60,90,and 120 mm/h with a silt-loamy loess *** grasses were planted in the field with the studied soil before being transplanted into a laboratory *** was allowed to resume growth for a period before the rain simulation *** showed that the grass cover reduced soil erosion by 63.90%to 92.75%and sediment transport rate by 80.59%to 96.17%under different slope gradients and rainfall *** sediment concentration/sediment transport rate from bare slope was significantly higher than from a grass-covered *** sediment concentration/transport rate from grass-covered slopes decreased linearly with grass coverage and increased with rainfall *** sediment concentration/transport rate from the bare slope increased as a power function of slope and reached the maximum value at the gradient of about 251,whereas that from grass-covered slope increased linearly and at much lower *** results of this study can be used to estimate the effect of vegetation on soil erosion from loess slopes.

关键词： loess soil Rainfall simulation Slope soil erosion Surface coverage

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Experimental determination of sediment transport capacity of rill flow over sandified loess slope

引用

International soil and Water Conservation Research 2023年第2期11卷 301-310页

作者： Ren Feng Jiacun Chen Zhenyue Xie Dingqiang Li Zaijian Yuan National-Regional Joint Engineering Research Center for soil Pollution Control and Remediation in South China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and ManagementInstitute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou510650China Meizhou International Institute of soil and Water Conservation Meizhou514000China

Rill erosion is affected by the sand particle content in soil,especially in the wind and water erosion transition region of the loess *** sediment transport capacity(STC)is a key parameter in rill erosion research,assessing the impact of aeolian sand intrusion on the STC of rill flow is of importance for a better understanding of rill *** study aimed to assess the effect of aeolian sand intrusion on the STC on sandified loess slopes,with typical slopes and flow discharges,using a flume system which consisting of a sediment-feeding and a sediment-supply/settlement *** sediment feeding flume was jointed by 10°higher than that of the sediment measurement flume *** flow discharges(2,4,and 8 L min^(-1))and four slope gradients(5°,10°,15°,and 25°)were used to represent the natural hydrological conditions under three intrusion rates(SIR)of aeolian sands(10%,20%,and 50%).The results show that STC increased with slope gradient and flow discharge,and the relationship between the STC and the SIR was significantly affected by the slope gradient;the STCs decreased with the SIR on a slope of 5°but increased with the SIR on steep slopes of 15°-25°,implying a significant impact of slope gradient on the relationship between SIR and *** SIR of 50%resulted in the highest sediment concentration nearly 1200 kg m^(-3)on slopes of 25°.On sandified loess slopes of 10%,20%,and 50%SIR,the STC were about 30%,46%,and 57%higher than on loess slopes,indicating an increased erosion rate by sand particle intrusion into loess *** results highlight the impact of sand intrusion on STC of rill flow and provide deeper insights into the soil loss process on the sandified loess slope.

关键词： Sand intrusion loess soil Rill flow Transport capacity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of freeze-thaw on soil erosion processes and sediment selectivity under simulated rainfall

引用

Journal of Arid Land 2017年第2期9卷 234-243页

作者： WANG Tian LI Peng REN Zongping XU Guoce LI Zhanbin YANG Yuanyuan TANG Shanshan YAO Jingwei State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area Xi’an University of Technology State Key Laboratory of soil Erosion and Dry-land Farming on the loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water Resources

The freeze-thaw （FT） processes affect an area of 46.3% in China. It is essential for soil and water conservation and ecological construction to elucidate the mechanisms of the FF processes and its associated soil erosion processes. In this research, we designed the control simulation experiments to promote the understanding of FT-water combined erosion processes. The results showed that the runoff of freeze-thaw slope （FTS） decreased by 8% compared to the control slope （CS）, and the total sediment yield of the FTS was 1.10 times that of the CS. The sediment yield rate from the FTS was significantly greater than that from the CS after 9 min of runoff （P〈0.01）. Both in FTS and CS treatments, the relationships between cumulative runoff and sediment yield can be fitted well with power functions （R2〉0.98, P〈0.01）. Significant differences in the mean weight diameter （MWD） values of particles were between the CS and the FTS treatments in the erosion were smaller than those under FTS for both washed and observed for washed particles and splashed particles process （P〈0.05）. The mean MWD values under CS splashed particles. The ratio of the absolute value of a regression coefficient between the CS and the FTS was 1.15, being roughly correspondent with the ratio of K between the two treatments. Therefore, the parameter a of the power function between cumulative runoff and sediment yield could be an acceptable indicator for expressing the soil erodibility. In conclusion, the FTS exhibited an increase in soil erosion compared to the CS.

关键词： freeze-thaw erosion loess soil soil erodibility runoff sediment size-selectivity rainfall simulation

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

Comparative Study on Rain Splash Erosion of Representative soils in China

引用

Chinese Geographical Science 2008年第2期18卷 155-161页

作者： CHENG Qinjuan CAI Qiangguo MA Wenjun Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Graduate University of the Chinese Academy of Sciences Beoing 100049 China College of Resources and Environment China Agricultural University Beijing 100094 China

As the first event of soil erosion, rain splash erosion supplies materials for subsequent transportation and en-trainment. The loess Plateau, the southern hilly region and the Northeast China are subject to serious soil and water loss; however, the characteristics of rain splash erosion in those regions are still unclear. The objectives of the study are to ana-lyze the characteristics of splash erosion on loess soil, red soil, purple soil and black soil, and to discuss the relationship between splash erosion and soil properties. soil samples spatially distributed in the abovementioned regions were col-lected and underwent simulated rainfalls at a high intensity of 1.2mm/min, lasting for 5, 10, 15, and 20min, respectively. Rain splash and soil crust development were analyzed. It shows that black soil sample from Heilongjiang Province corre-sponds to the minimum splash erosion amount because it has high aggregate content, aggregate stability and organic mat-ter content. loess soil sample from Inner Mongolia corresponds to the maximum splash erosion amount because it has high content of sand particles. loess soil sample from Shanxi Province has relatively lower splash erosion amount be-cause it has high silt particle content and low aggregate stability easily to be disrupted under rainfalls with high intensity. Although aggregate contents of red soil and purple soil samples from Hubei and Guangdong provinces are high, the sta-bility is weak and prone to be disrupted, so the splash erosion amount is medium. Splash rate which fluctuates over time is observed because soil crust development follows a cycling processes of formation and disruption. In addition, there are two locations of soil crust development, one appears at the surface, and the other occurs at the subsurface.

关键词： rain splash erosion black soil loess soil red soil purple soil soil crust

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

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

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：