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Search Results: 1 - 10 of 104205 matches for " Ganlin Zhang "
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Evolution and significance of soil magnetism of basalt-derived chronosequence soils in tropical southern China  [PDF]
Decheng Li, Yanfang Yang, Jinping Guo, Bruce Velde, Ganlin Zhang, Feng Hu, Mingsong Zhao
Agricultural Sciences (AS) , 2011, DOI: 10.4236/as.2011.24070
Abstract: Soil samples were collected from eight basalt- derived chronosequence soils with the ages of 0.01, 0.58, 0.92, 1.33, 2.04, 3.04, 3.76 and 6.12 Ma respectively from Leizhou Peninsula and northern Hainan Island of tropical southern China. Magnetic parameters of magnetic susceptibility (MS), percentage of frequency-dependent magnetic susceptibility (FDS%), anhysteretic remanent magnetization (ARM), saturation isothermal remanent magnetization (SIRM), soft and hard isothermal remanent magnetization (IRMs and IRMh) of the collected samples were measured to study the evolution and the significance of the magnetism with soil age. The results show that the magnetic parameters changed fast from Primosols to Ferrosols (0.01 ~ 0.92 Ma) but slowly at Ferralosols stage (1.33 Ma~), it suggests a stable phase occurred for soil magnetism at Ferralosols, the existence of this phase could be supported by the little changes in the contents of clay, Fet and Fed. Obvious differences existed in the values of magnetic parameters between Ferralosols and other soil types (Primosols and Ferrosols), FDS%: Ferralosols > 10%, Primosols and Ferrosols < 10%; ARM, Ferralosols < 7000 × 10–8· SIm3·kg–1, Primosols and Ferrosols > 8000 × 10–8 SIm3·kg–1, thus, it is possible to differentiate Ferralosols from other soil types in tropical region by using magnetic indices.
Nitrogen sink in a small forested watershed of subtropical China

Laiming Huang,Jinling Yang,Ganlin Zhang,

环境科学学报(英文版) , 2011,
Abstract: Global nitrogen (N) emission and deposition have been increased rapidly due to massive mobilization of N which may have longreaching impacts on ecosystems. Many agricultural and forest ecosystems have been identified as secondary N sources. In the present study, the input-output budget of inorganic N in a small forested watershed of subtropical China was investigated. Inorganic N wet deposition and discharge by stream water were monitored from March, 2007 to February, 2009. The concentrations and fluxes of inorganic N in wet precipitation and stream water and net retention of N were calculated. Global N input by dry deposition and biological fixation and N output by denitrification for forested watersheds elsewhere were reported as references to evaluate whether the studied forested watershed is a source or a sink for N. The results show that the inorganic N output by the stream water is mainly caused by NO3??-N even though the input is dominated by NH4 +-N. The mean flux of inorganic N input by wet precipitation and output by stream water is 1.672 and 0.537 g N/(m2 yr), respectively, which indicates that most of inorganic N input is retained in the forested watershed. Net retention of inorganic N reaches 1.135 g N/(m2 yr) considering wet precipitation as the main input and stream water as the main output. If N input by dry deposition and biological fixation and output by denitrification are taken into account, this subtropical forested watershed currently acts as a considerable sink for N, with a net sink ranging from 1.309 to 1.913 g N/(m2 yr) which may enhance carbon sequestration of the terrestrial ecosystem.
Content, Density, Illuviation Mode and Depth of CaCO3 in Soils of Semiarid-Arid Qilian Mountains—An Altitude Sequence Study of the Hulugou Watershed  [PDF]
Ka Lin, Decheng Li, Ganlin Zhang, Yuguo Zhao, Jinling Yang, Feng Liu, Xiaodong Song
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.86036
Abstract: The parental material of soils in the Qilian Mountains of northwest China is mainly aeolian loess containing CaCO3 which may remain in soils under the semiarid-arid climate. To disclose the CaCO3 characteristics change with the altitude and the terrain attributes, we surveyed 18 soil profiles in an altitude sequence from 3076 m to 4510 m in the Hulugou Watershed in the Qilian Mountains, measured CaCO3 contents of all genetic horizon samples, analyzed the densities, illuviation modes and depths of CaCO3 in the profiles, extracted values of the terrain attributes of the profiles including altitude slope, aspect, plane curvature, profile curvature and terrain wetness index (TWI) from the 90 m resolution SRTM3 DEM data on ArcGIS 9.3 platform. We found that CaCO3 weighted content of the profiles ranged from 1.30 g·kg-1 to 93.09 g·kg-1, CaCO3 density from 0.05 kg/m2 to 75.69 kg/m2, CaCO3 illuviation depth from 12 cm to 54 cm. CaCO3 illuviation modes could be divided into three types, i.e., no illuviation mode in which the profile has only A horizon or CaCO3 content < 5 g·kg-1, middle illuviation mode in which CaCO3 accumulated in a middle horizon, and down illuviation mode in which CaCO3 content increases with the depth. CaCO3 weighted content, density and illuviation depth had significant correlation with certain terrain attributes. In general, the altitude sequence is an effective way to study CaCO3 characteristics in the alpine region, and the data of terrain attributes which can influence the precipitation and its redistribution in soil are potential in predicting soil CaCO3 characteristics in the alpine region.
DISTRIBUTIONS OF PHOSPHORUS IN EUM-ORTHIC ANTHROSOLS AND ITS PEDOGENIC IMPLICATION
土垫旱耕人为土中磷的分布特征及其土壤发生学意义

Pan Jihua,Zhang Ganlin,
潘继花
,张甘霖

第四纪研究 , 2008,
Abstract: Phosphorus(P),an important soil nutrient element,has its change closely related to natural pedogenic processes and human activities.In order to understand P behaviors during natural and anthropogenic pedogensis,three profiles with different land uses and different thickness of cumulic layers were analyzed.The results show that compared with the underlying layer of naturally formed Luvisols,total P(TP),available P(AP),organic P(OP),and inorganic P(IP)contents in the upper layer of Eum-Orthic Anthrosols increased 0.29,4.67,0.20,0.30 times respectively.In the upper layer of Eum-Orthic Anthrosols,all phosphorus forms had the highest contents in Aup1 horizon and decreased rapidly down to Aup2 horizon.TP and OP decreased gradually from Aup2 horizon to Aupb horizon and then to 2A horizon,reflecting that the intensity of human activity was different in different historical periods.In the underlying layer of naturally formed Luvisols,because P was inherited from loess and mainly affected by natural factors,the contents of TP,AP,OP,IP were lower than in the horizons of Eum-Orthic Anthrosols.P contents in horizons of Eum-Orthic Anthrosols at the toe-slope position with vegetable land use were higher than those at the upper terrace crop land.The distribution patterns of different forms of P in profiles were attributed to their mobility,the calcium content,as well as uptake by roots,irrigation,and fertilization.The relationship between OP and OP/IP and the relationship between different forms of P and soil organic matter,iron,calcium,and clay content reflected the different effects of natural soil genesis processes and human activities.
Change of Tillage Layer Thickness of Farmland in Anhui Province of Eastern China  [PDF]
Yuxin Ma, Decheng Li, Ganlin Zhang, Xusheng Li, Yuguo Zhao, Jinling Yang, Feng Liu, Mingsong Zhao, Shanquan Li, Changlong Wei, Fan Yang, Laiming Huang
Agricultural Sciences (AS) , 2014, DOI: 10.4236/as.2014.55041
Abstract:

Tillage layer thickness (TLT) of farmland could be regarded as one of physical indexes in assessing soil productivity and quality. In recent years, tillage layer shallowing was found in China in various regions, mainly due to the adoption of non-tillage or rotary tillage practices, but only little rough and non-quantitative information is available so far on the issue. This research took Anhui, a typical agricultural province in Eastern China as an example and compared the TLTs of 87 typical profiles on provincial scale and 210 on county scale from 1980s to 2010s. The results showed that TLTs of 3.7% and 17.2% of samples in 1980s and 2010s respectively were larger than 20 cm. From 1980s to 2010s the mean TLT increased from 16.3 to 17.4 cm on the provincial scale and from 15.0 to 15.5 cm on the county scale respectively. In the middle and southern regions the mean TLTs increased by 0.4-0.7 cm on the provincial scale and 0.3-3.2 cm on the county scale respectively, but decreased by 2.0 cm in northern region on the county scale. The mean TLT increased by 0.8 cm for paddy-field and 1.4 cm for dry-land on the provincial scale. TLT was influenced comprehensively by the factors of soil texture, the depth of rotary tillage and the farming positivity of the farmers. Generally, TLT of farmland with coarse soil texture was higher than that of farmland with fine soil texture, in 1980s TLT in region of poor-economic condition usually was deeper than in region of good-economic condition, and the adoption of rotary tillage led widely TLTs of farmlands to about 15 cm in 2010s.

The temporal and spatial distribution of ancient rice in China and its implications
GONG ZiTong,CHEN HongZhao,YUAN DaGang,ZHAO YuGuo,WU YunJin,ZHANG GanLin,
GONG
,ZiTong,CHEN,HongZhao,YUAN,DaGang,ZHAO,YuGuo,WU,YunJin,ZHANG,GanLin

科学通报(英文版) , 2007,
Abstract: The relics of ancient rice have been regarded as the most important objective evidence of the origina- tion and spread of rice cultivation.Based on the records of 280 rice relics sites and the rice cropping regionalization as well as the distribution map of paddy soils,the current study compiled the temporal and spatial distribution map of ancient rice distribution in China.The map shows that the distribution of ancient rice is spatially extensive and meantime comparatively concentrated,temporarily covering a long and relatively continuous time-span.The rice relics in the Central China double and single rice cropping regions are among the earliest and the most abundant ones,possessing continuity in time sequence.Combined with the discovery of ancient rice and paddy filed relics,soil micromorphology, pollen combination and element geochemistry,it is suggested that Central China was the origin center of rice cultivation in China.Rice had been spread to the rest part of China in three major waves,also to the East Asian part like Korea and Japan.The temporal and spatial distribution of ancient rice reflects the past environmental change,which is also meaningful to the current rice regionalization and plan- ning as well as food security in China.
Landform-based pedodiversity of some soil chemical properties in Hainan Island,China
海南岛不同地形上某些土壤化学性质的多样性分析

ZHANG Xuelei,CHEN Jie,ZHANG Ganlin,
张学雷
,陈杰,张甘霖

应用生态学报 , 2004,
Abstract: Diversity indices and abundance distribution models are the statistical tools having been applied by ecologists for decades to analyze the intrinsic regularities of various ecological entities.In this work,similar techniques were used to analyze the pedodiversity of some soil chemical properties in Hainan Island,China,and discussions were conducted on the basis of related SOTER digital databases.Through the calculation of the richness (S),diversity (H') and evenness (E) of pH value,CEC and organic matter content in surface soil of different landforms and the establishment and application of the multi-distribution models of these soil chemical properties,the pedodiversity of some soil chemical properties of different landforms in Hainan Island in the GIS environment could be expressed digitally.
Landform Based Pedodiversity of Some Soil Properties in Hainan
海南岛不同地形上土壤性质的多样性分析

ZHANG Xuelei,CHEN Jie,ZHANG Ganlin,
张学雷
,陈杰,张甘霖

地理学报 , 2003,
Abstract: Diversity indices and abundance distribution models are statistical tools which ecologists have applied for decades for analyzing the intrinsic regularities of various ecological entities. In this work, similar techniques are used to analyze pedodiversity of some soil properties, and discussions are conducted on the basis of the SOTER digital databases in Hainan Island of China. Through calculation of indices of richness (S), indices of diversity (H') and indices of evenness (E) of soil profile depth types, soil horizon number types and soil (surface) bulk density types of different landforms, and establishment and application of the model of multi-distribution of soil profile depth types, soil horizon number types and soil (surface) bulk density types of the landforms, the analysis of pedodiversity of some soil properties of different landforms in Hainan under the GIS environment can be expressed digitally.
Figure 1 Linear fitness of the index H' respectively calculated by the number or the area of the related Sus Pedodiversity analysis in Hainan Island

ZHANG Xuelei,CHEN Jie,ZHANG Ganlin,TAN Manzhi,JJ Ibá,?ez,

地理学报 , 2003,
Abstract:
The temporal and spatial distribution of ancient rice in China and its implications
ZiTong Gong,HongZhao Chen,DaGang Yuan,YuGuo Zhao,YunJin Wu,GanLin Zhang
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0130-3
Abstract: The relics of ancient rice have been regarded as the most important objective evidence of the origination and spread of rice cultivation. Based on the records of 280 rice relics sites and the rice cropping regionalization as well as the distribution map of paddy soils, the current study compiled the temporal and spatial distribution map of ancient rice distribution in China. The map shows that the distribution of ancient rice is spatially extensive and meantime comparatively concentrated, temporarily covering a long and relatively continuous time-span. The rice relics in the Central China double and single rice cropping regions are among the earliest and the most abundant ones, possessing continuity in time sequence. Combined with the discovery of ancient rice and paddy filed relics, soil micromorphology, pollen combination and element geochemistry, it is suggested that Central China was the origin center of rice cultivation in China. Rice had been spread to the rest part of China in three major waves, also to the East Asian part like Korea and Japan. The temporal and spatial distribution of ancient rice reflects the past environmental change, which is also meaningful to the current rice regionalization and planning as well as food security in China.
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