检索结果-南通市图书馆

Phosphate Sorption-Desorption Characteristics in Two inceptisols and an Alfisol of Chattisgarh, India

Pedosphere 2005年第5期15卷 611-619页

作者： A. K. DOLUI S. S. ROY Department of Agricultural Chemistry and Soil Science Institute of Agricultural Science Calcutta University 35 Bally-gunge Circular Road Kolkata 700 019 (India).Department of Agricultural Chemistry and Soil Science Institute of Agricultural Science Calcutta University 35 Bally-gunge Circular Road Kolkata 700 019 (India).

Two inceptisols and an Alfisol of the Indravati Catchment area in Chattisgarh, India, comprising several gradientsin physical and chemical properties were studied to relate phosphate sorption and desorption to soil properties. Fromthe P isotherm curve, the standard P requirement (SPR) of the soils was determined. Phosphate sorption data were alsofitted both to the Langmuir and Freundlich Equations. The mean sorption maximum values for three different soil serieswere: Bastar > Geedam > Mosodi. The fraction of added phosphate sorbed for the 3 series followed this same trend asdid SPR; the phosphate sorption maximum and the maximum phosphate buffering capacity, which were estimated by theLangmuir isotherm; and the Freundlich constant 1/n. However, phosphate desorption, as well as the maximum recoverypercent did not follow this order. The phosphate affinity constant (K) was also different following the same progressionfor the 3 soil series as the Freundlich constant K’, which measured sorption strength. Meanwhile, an inverse order existedfor K and K’ versus the percent desorbed relative to the sorbed as well as the maximum recovery percent. In addition,significant correlation coefficients among sorption parameters of P and soil factors were found.

关键词： Alfisols inceptisols phosphate sorption-desorption

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

Nature of Soil Acidity in Relation to Properties and Lime Requirement of Some inceptisols

引用

Pedosphere 2003年第2期13卷 181-188页

作者： A.K.DOLUI S.BHATTACHARJEE Division of Agricultural Chemistry and Soil Science University College of Agriculture Calcutta UniversityDivision of Agricultural Chemistry and Soil Science University College of Agriculture Calcutta University 35 Ballygunge Circular Road Kolkata 700 019 (India) 35 Ballygunge Circular Road Kolkata 700 019 (India)

Some inceptisols representing the Singla catchment area in Karimgaungedistrict of Assam, India, were studied for lime requirement as influenced by the nature of soilacidity. The electrostatically bonded (EB)-H^+ and EB-Al^(3+) acidities constituted 33 and 67percent of exchangeable acidity while EB-H^+, EB-Al^(3+), exchangeable and pH-dependent aciditiescomprised 6, 14, 20 and 80 percent of total potential acidity. The pH-dependent acidity made a majorcontribution towards the total potential acidity (67%～84%). Grand mean of lime requirementdetermined by the laboratory incubation method and estimated by the methods of New Woodruff,Woodruff and Peech as expressed in MgCaCO_3 ha^(-1) was in the order: Woodruff (15.6) > New Woodruff(14.9) > Peech (5.1) > incubation (5.0). Correlations analysis among different forms of acidity andlime requirement methods with selected soil properties showed that pH in three media, namely water,1 mol L^(-1) KC1 and 0.01 mol L^(-1) CaCl_2, had a significant negative correlation with differentforms of acidity and lime requirement methods. Exchangeable Fe and Al showed significant positivecorrelations with EB-Al^(3+) acidity, exchangeable acidity, pH-dependent acidity and total potentialacidity, and also lime requirement methods. Extractable Al showed positive correlations withdifferent forms of acidity except EB-H^+ and EB-Al^(3+) acidities. The lime requirement by differentmethods depended upon the extractable aluminium. Significant positive correlations existed betweenlime requirements and different forms of acidity of the soils except EB-H^+ acidity and incubationmethod. The nature of soil acidity was mostly pH-dependent. Statistically, the Woodruff method didslightly better than the New Woodruff, incubation and Peech methods at estimating lime requirementand hence the Woodruff procedure may be recommended for routine soil testing because of its speedand simplicity.

关键词： inceptisols lime requirement nature of acidity soil properties

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

Chemical Fractionation and Sorption of Phosphorus in Greek inceptisols

引用

Journal of Agricultural Science and Technology(A) 2011年第1X期1卷 33-38页

作者： M. Bastounopoulou D. Gasparatos C. Haidouti I. Massas Laboratory of Soils and Agricultural Chemistry Agricultural University of Athens Iera Odos 75 Athens 11855 Greece

Phosphorus fractionation and sorption, both separately and jointly, were studied in two cultivated inceptisols in Northern Greece. Hedley＇s extraction was used to separate soil phosphorus （P） into inorganic Pi （geochemical） and organic Po （biological） fractions. Direct extractable P by Olsen （Olsen-P）, by Mehlich llI （M3-P） and by ammonium oxalate （Pox） was also determined. Phosphorus sorption was carried out with 1：10 soil/solution ratio and sorption parameters were derived from the Langmuir model to the experimental data. Most of the total P occurred in inorganic P forms （74% of Pt）, while organic P comprised only 26% of the Pt. Among the various inorganic P forms relatively large amount of residual P （111 mg kg^-1） was observed, while occluded P in calcium phosphate minerals （***-Pi） and in Fe, Al-oxides （***-Pi） existed in equal amounts （83.1 and 83.7 mg kg^-1 respectively）. The phosphorus sorption parameters showed positive relationships with clay content, cation exchange capacity and the sum of exchangeable calcium plus magnesium. Overall, this study indicated that Ca and Mg compounds strongly influence the P chemistry in moderately weathered soils, with relatively high concentration of primary P minerals.

关键词： Phosphorus fractionation sorption langmuir equation inceptisols

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

Effect of land use, season, and soil depth on soil microbial biomass carbon of Eastern Himalayas

引用

Ecological Processes 2020年第1期9卷 775-788页

作者： Nima Tshering Lepcha N.Bijayalaxmi Devi Department of Botany Ecology LaboratorySikkim University6th MileGangtokSikkim 737102India

Background:Soil microbial biomass,an important nutrient pool for ecosystem nutrient cycling is affected by several factors including climate,edaphic,and land-use *** soils are young and unstable and prone to erosion and degradation due to its topography,bioclimatic conditions and anthropogenic activities such as frequent land-use *** this study,we tried to assess how soil parameters and microbial biomass carbon(MBC)of Eastern Himalayan soils originated from gneissic rock change with land-use type,soil depth and *** fumigation extraction method was employed to determine MBC from different land-use ***:Soil physical and chemical properties varied significantly with season,land-use and soil depth(p<0.001).The maximum values of soil properties were observed in the rainy season followed by summer and winter season in all the study *** mean microbial biomass carbon was highest in the forest(455.03μg g−1)followed by cardamom agroforestry(392.86μg g−1)and paddy cropland(317.47μg g−1).Microbial biomass carbon exhibited strong significant seasonal difference(p<0.001)in all the land-use types with a peak value in the rainy season(forest-592.78μg g−1;agroforestry-499.84μg g−1 and cropland-365.21μg g−1)and lowest in the winter season(forest−338.46μg g−1;agroforestry-320.28μg g−1 and cropland−265.70μg g−1).The value of microbial biomass carbon decreased significantly with soil depth(p<0.001)but showed an insignificant increase in the second year which corresponds to a change in rainfall ***,land-use type,season and soil depth,soil properties also strongly influenced microbial biomass carbon(p<0.001).Microbial quotient was highest in the agroforestry system(2.16%)and least in the subtropical forest(1.91%).Conclusions:Our results indicate that land-use,soil depth and season significantly influenced soil properties and microbial biomass *** physical and chemical properties of soil and MBC exhibit strong seas

关键词： Soil properties inceptisols Cardamom agroforestry Paddy cropland Subtropical forest Soil organic carbon

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

Features of selected benchmark soils along an elevational transect of the northeastern part of the Moldavian Plateau (Romania)

引用

International Soil and Water Conservation Research 2018年第4期6卷 325-330页

作者： Geanina Bireescu Carmelo Dazzi Giuseppe Lo Papa Institute of Biological Research Department of Experimental and Applied BiologyIasiRomania Dipartimento Scienze Agrarie Alimentari e Forestali Universitàdegli Studi di PalermoItaly

Soil morphological, physical and chemical properties are described at four locations along an elevational transect in the northeastern part of the Moldavian Plateau (Romania). These data contribute to the knowledge of the soils of this area and to their classification according to the USDA-Soil Taxonomy, FAOWRB and the SRTS-Romanian System. The soils were classified as inceptisols, Alfisols and Mollisols, according to the USDA-Soil Taxonomy;Gleysol, Chernozem and Luvisol, according to the FAO-WRB and Gleiosol, Cernoziom, Preluvosol, Luvosol, according to the SRTS-Romanian System. The selected soils have a range of properties that represent the soilscape of the Moldavian subcarpathian plateau, characterised by a natural forest with oak as the dominant species. The selected soil parameters decreased with increasing elevation;calcium carbonate and clay leaching and accumulation are the main soil formation processes.

关键词： inceptisols Alfisols Mollisols Climosequence Moldavian Plateau

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

Geochemical indices of soil development on basalt rocks in arid to sub-humid climosequence of Central Iran

引用

Journal of Mountain Science 2020年第7期17卷 1652-1669页

作者： Ahmad HEIDARI Alireza RAHEB Soil Science Department College of Agriculture and Natural ResourcesUniversity of TehranKarajP.O.Box 4111Iran

Quantitative weathering indices are efficient tools in determining the soil development from the underlying *** order to evaluate the effects of climate on the soils developed under an arid to sub-humid climosequence in central Iran,twenty soil-development indices were *** samples from six pedons were analyzed for routine physico-chemical and geochemical analyses using X-ray fluorescence(XRF).The lowest and highest calculated soil development indices were observed in the arid and sub-humid regions *** the studied indices,fifteen indices showed similar trends concerning the intensity of *** consistency of such trends reveals the feasibility of using these indices to evaluate basalt weathering rate and soil development in arid,semi-arid and sub-humid *** study demonstrated that,among the evaluated weathering indices,the Weathering Index of Parker(WIP)and mass transfer coefficient(τ)were the most proper indices for predicting basalt weathering *** is due to the fact that these indices use the highly mobile earth elements which are the most sensitive elements in basalt chemical *** calculated indices were subdivided into three subgroups including the ratios of mobile/immobile,mobile/mobile and immobile/mobile elements based on the elements used in their *** state of soil evolution was more accurately predicted compared to the other subgroups using the mobile/immobile subgroup of ***,the weathering indices calculated using the mobile elements are better indicators of weathering intensity,soil formation and the exogenous processes across the arid to sub-humid climosequence.

关键词： Basalt Climosequence Geochemical properties Aridisols Mollisols inceptisols

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：