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    2011年, 第21卷, 第5期 刊出日期:2011-08-17 上一期    下一期
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    论文
    Distribution, Properties, Land Use and Management of Mollisols
    in South America
    Artigas Durán, Héctor Morrás, Guillermo Studdert, LIU Xiaobing
    2011 (5):  511. 
    摘要 ( 1272 )   PDF(459KB) ( 1527 )  

    Mollisols are common in South America. They cover about 8.87 × 107 ha, 1.3 × 107 ha and 4.3 × 106 ha in Argentina, Uruguay

    and Southern Brazil respectively, which is 11.5% of the world total. Most of South American Mollisols were developed on Pleistocene and

    Holocene sediments and lie within the limits of the temperate zone, though the extreme north is bordering subtropical and the extreme

    south is within a cold-temperate zone. All suborders of Mollisols occur in Argentina, the most extensive being Udolls followed by Ustolls,

    whereas only Udolls, Aquolls and Albolls occur in Uruguay. Vertisols in Uruguay have many properties similar to Mollisols, and the

    occurrence of Vertisols is strongly associated with Mollisols. The Pampean Mollisols are a significant component of the global breadbasket

    of modern times. The main Argentine crops are wheat, corn, sorghum, barley, soybeans and sunflower, while Mollisols in Uruguay remain

    mostly dedicated to cattle and sheep grazing though crop production has been increasing very rapidly in the last decade. Throughout

    South America, research has shown that Mollisols are experiencing losses of soil organic matter and nutrients, and degradation of physical

    properties after long cropping periods, resulting in soil scientists calling for increased conservation practices to reduce future losses and a

    deterioration of soil quality, and thus a more sustainable agriculture in the region.

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    Mechanism and Forecasting Methods for Severe Droughts and Floods in Songhua River Basin in China
    LI Hongyan, WANG Yuxin, LI Xiubin
    2011 (5):  531. 
    摘要 ( 1103 )   PDF(276KB) ( 1250 )  

    The influence of various factors, mechanisms, and principles affecting runoff are summarized as periodic law, random law, and

    basin-wide law. Periodic law is restricted by astronomical factors, random law is restricted by atmospheric circulation, and basin-wide law

    is restricted by underlying surface. The commensurability method was used to identify the almost period law, the wave method was

    applied to deducing the random law, and the precursor method was applied in order to forecast runoff magnitude for the current year.

    These three methods can be used to assess each other and to forecast runoff. The system can also be applied to forecasting wet years,

    normal years and dry years for a particular year as well as forecasting years when floods with similar characteristics of previous floods,

    can be expected. Based on hydrological climate data of Baishan (1933–2009) and Nierji (1886–2009) in the Songhua River Basin, the

    forecasting results for 2010 show that it was a wet year in the Baishan Reservoir, similar to the year of 1995; it was a secondary dry

    year in the Nierji Reservoir, similar to the year of 1980. The actual water inflow into the Baishan Reservoir was 1.178 × 1010 m3 in 2010,

    which was markedly higher than average inflows, ranking as the second highest in history since records began. The actual water inflow at

    the Nierji station in 2010 was 9.96 × 109 m3, which was lower than the average over a period of many years. These results indicate a

    preliminary conclusion that the methods proposed in this paper have been proved to be reasonable and reliable, which will encourage the

    application of the chief reporter release system for each basin. This system was also used to forecast inflows for 2011, indicating a

    secondary wet year for the Baishan Reservoir in 2011, similar to that experienced in 1991. A secondary wet year was also forecast for

    the Nierji station in 2011, similar to that experienced during 1983. According to the nature of influencing factors, mechanisms and

    forecasting methods and the service objects, mid- to long-term hydrological forecasting can be divided into two classes: mid- to long-

    term runoff forecasting, and severe floods and droughts forecasting. The former can be applied to quantitative forecasting of runoff,

    which has important applications for water release schedules. The latter, i.e., qualitative disaster forecasting, is important for flood

    control and drought relief. Practical methods for forecasting severe droughts and floods are discussed in this paper.

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    Quantitative Assessment of Impacts of Climate and Economic-technical Factors on Grain Yield in Jilin Province from 1980 to 2008
    YAO Zuofang, YANG Fei, LIU Xingtu, YAN Minhua, MENG Jun
    2011 (5):  543. 
    摘要 ( 922 )   PDF(546KB) ( 1343 )  

    Climate change is one of the most important challenges threatening agricultural grain yield and food security. Determining the

    factors influencing grain yield in Jilin Province and the weights of their contribution are a very important task, because Jilin Province is an

    important agriculture base in China. In this study, the accumulation factor sequence evaluating data method was used to analyze the

    climate and economic-technical factor contribution weights to grain yield and grain yield changes in each city of Jilin Province. Climate

    yield was also estimated to study the climate effect on the grain yield, and it was calculated in two ways: an improved algorithm and a

    traditional quadratic method. The results show that the climate and economic-technical factors have different contribution weights to

    grain yield in different cities in Jilin Province. The contribution weight of the climate factor to grain yield was 0.212–0.349, while that the

    economic-technical factor was 0.651–0.788. Furthermore, the changes of the climate factor contributing to grain yield changes

    accounted for 0.296–0.546, and the changes of the economic-technical factor accounted for 0.454–0.704. The weights of climate and

    economic-technical factor contributing to grain yield are very different between the eastern and western cities in Jilin Province, but their

    weights contributing to the grain yield change are similar in these cities. In general, the amount of fertilizer used per hectare (FUPH) is

    the main factor affecting grain yields and yield changes from 1980 to 2008. It is noted that when the FUPH growth rate stabilized after

    1995, the effects of the climate factor on the grain yield become more obvious than before. The improved algorithm is effective for

    estimating climate yield in Jilin Province, and the climate yields were mostly between –500 kg/ha and 500 kg/ha, and showed a slightly

    rising trend in most cities.

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    Effective Solution Algorithm for Tomographic Inversion of Volume Emission Rate from Satellite-based Limb Measurement
    WANG Zijun, CHEN Shengbo
    2011 (5):  554. 
    摘要 ( 806 )   PDF(459KB) ( 1300 )  

    The volume emission rate (VER) of airglow can be used to investigate atmospheric processes. Satellite-based limb measurement

    of atmosphere is able to obtain the VER profile of airglow with high vertical resolution. However, the traditional one-dimensional retrieval

    techniques for VER inversion fail to retrieve horizontal structure of VER profile. Thus, the tomographic technique based on the maximum

    probability is applied to retrieving two-dimensional VER profile of airglow from infrared limb measurement. This technique could process the

    observed data with low signal-to-noise ratio caused by the observation angle of less than 180° due to the solid nature of the Earth. For

    saving the processing time and improving the computing speed of VER inversion, serial tables for storing the large sparse matrix for

    radiance simulation and a large dataset during iterative estimate of VER are presented. The index and weighting factor of line of sight

    (LOS) through each grid are saved in initial estimate to avoid being computed repeatedly. Furthermore, the product of observed radiance

    and corresponding weighting factor obtained in initial iteration is stored as weighted observed radiance for the iterative calculation

    subsequently. Based on the improved algorithm, the VER of airglow is inversed through the tomographic technique. The full width of half

    maximum (FWHM) of error is 1.78% and the offset of the peak percentage error is 0.22% after 40 iterations for final VER. Comparison of

    assumed and retrieved VER profiles suggests that VER can be retrieved with a bias of 15% between 10 km and 90 km above the LayerMin

    (6384 km from the Earth center), and with a bias of 8% for altitude from 30 km to 60 km with vertical resolution of 1 km after 40

    iterations. After improvements, the computation speed of VER inversion for once can be improved by 29.6 times for 700 images of 1/3

    orbit, and accordingly, the processing time will be reduced from 3 hours and 11 minutes to only 6 minutes. In conclusion, the

    improvements to tomographic inversion of VER of airglow proposed in this paper are effective and significant.

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    Distribution Orientation and Driving Mechanism of Geographical Pattern Change of China′s Banking Industry
    CHEN Dong, FAN Jie
    2011 (5):  563. 
    摘要 ( 1265 )   PDF(620KB) ( 1358 )  

    By analyzing the relationship among government, market driving forces, distribution orientation of banking industry, service

    opportunity equality and spatial patterns, this paper proposes that it is distribution orientation that lead to the formation and evolution of

    spatial pattern of banking industry. The difference of the distribution orientation leads to the separation of the spatial pattern of banking

    industry, and the change of the distribution orientation leads to the change of spatial pattern. The degree of spatial pattern change is

    subject to the degree of change of distribution orientation, and the scale of bank resources in the regions, which supports the

    distribution orientation variation. Based on these theoretical frameworks, some indicators were designed to analyze the pattern change of

    China′s banking industry and its effects since 1995 under the change of the distribution orientation. This paper finds that the orientation

    of economic benefit maximization driven by market causes the banking industry to concentrate in economically developed regions. The

    government, which does not follow the orientation of economic benefit maximization, plays a role of stabilizer. Since the bank branches in

    the regions with the greatest change in bank branch distribution are too few, and regions with the greatest change in bank loan

    allocation are the regions with lots of loans, the pattern change of the banking industry in physical form is not as notable as that in

    economic form.

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    Simulating Impact of Larch Caterpillar (Dendrolimus superans) on Fire Regime and Forest Landscape in Da Hinggan Mountains,
    Northeast China
    CHEN Hongwei, HU Yuanman, CHANG Yu, BU Rencang, LI Yuehui, LIU Miao
    2011 (5):  575. 
    摘要 ( 1370 )   PDF(480KB) ( 1321 )  

    Larch caterpillar (Dendrolimus superans) is very common in the Da Hinggan Mountains, Northeast China, affecting fire regime

    and forest ecosystem change at large spatio-temporal scales. In this study, we used a spatially explicit landscape model, LANDIS, to

    simulate the changes of fire regime and forest landscape under four larch caterpillar disturbance intensity levels scenarios in Huzhong

    forest area, northern of Da Hinggan Mountains. The results indicate that larch caterpillar disturbances would decrease fine fuel load and

    increase coarse fuel load in the 300 simulation years. Larch caterpillar disturbances would decrease fire frequency in the first 200 years,

    and the disturbances also decrease fire intensity and fire risk in the early and late stage of simulation. Larch caterpillar disturbances

    would decrease the area percent of larch cohorts and increase the proportion of white birch, and increase the degree of aggregation of

    white birch as a result of its strong seed dispersal and colonization ability. Disturbances would also decrease the mature and over-mature

    larch cohorts and increase all cohorts of white birch, especially the mature and over-mature cohorts. Larch caterpillar disturbances will

    decrease the stability of forest landscape, therefore, some measures preventing insect outbreak and ensuring the sustainable

    management of forest ecosystem should been taken in the study area.

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    Land Use Change and Anthropogenic Driving Forces: A Case Study in Yanhe River Basin
    SU Changhong, FU Bojie, LU Yihe, et al.
    2011 (5):  587. 
    摘要 ( 1628 )   PDF(606KB) ( 2554 )  

     Human activities alter land use patterns and affect landscape sustainability. It is therefore very important to investigate the

    relationship between land use change and human activities. This study focuses on the detection of changing land use patterns in the

    Yanhe River Basin in northern Loess Plateau of China between 1995 and 2008. Landscape metrics were used to analyze the changing land

    use patterns and to explore the related anthropogenic driving forces. Results show that: 1) Totally, 186 590 ha of croplands were

    converted into alternate land-use types (equivalent to 61.7% of the original cropland area). The majority of cropland areas were found to

    be converted into grassland and woodland areas (accounting for 55.9% and 4.9% respectively of the original cropland areas). 2) Both

    cropland and woodland demonstrated an increasing fragmentation tendency while grasslands showed a decreasing fragmentation

    tendency. 3) Multiple driving forces of land use change were thought to act together to changes in landscape metrics in the Yanhe River

    Basin. The anthropogenic driving forces were analyzed from four perspectives: ecological conservation policy, labor force transfer,

    industrial development, and rural settlement. The policy of the GfG (Grain for Green) project was the main driving factor which expedited

    the conversion from cropland to woodland and grassland. Industrial development was also found to affect land use change through the

    direct impact of economic activities such as oil exploration and agricultural production, or through indirect impacts such as the industrial

    structures readjustment. Labor force transfer from rural to urban areas was found to follow the industrial structure readjustment and

    further drove land use change from cropland to off-farm land use. Establishment of new tile-roofed houses instead of cave-type dwellings

    in rural settlements has helped to aggregate the original scattered land-use type of construction.

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    Human Driving Forces: Analysis of Rocky Desertification in Karst Region in Guanling County, Guizhou Province
    WU Xiuqin, LIU Hongmeng, HUANG Xiulan, ZHOU Tao
    2011 (5):  600. 
    摘要 ( 1068 )   PDF(267KB) ( 1971 )  

    Karst rocky desertification is one of the major ecological and environmental problems that threaten the sustainable

    development of southwestern China. It is caused by irrational and intensive land-use patterns in karst geo-ecological environment.

    Therefore, it is vital to identify how human forces work on this degraded environment. Based on the soil erosion information in 2000 and

    remote sensing images of Guanling County collected in 2000 and 2007, four grades of karst rocky desertification data in 14 villages of

    Guanling County were extracted. Impacts of population, affluence, and other human forces on karst rocky desertification were analyzed

    using STIRPAT model. The results show that: 1) Factors of population and affluence had strong influence on karst rocky desertification.

    In the STIRPAT model analysis, the population and affluence coefficients were positive, indicating that the increase in population and

    affluence would lead to more serious desertification. 2) Factors of farmer correlated with karst rocky desertification negatively, especially

    the way of viewing the relationship between people and nature, and the level of knowledge about rocky desertification. Government

    behavior was not a significant factor in this analysis. 3) The findings provide evidence that STIRPAT model can be used to analyze the

    relationship between human driving forces and rocky desertification.

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    Application of Land-use Change Model in Guiding Regional Planning: A Case Study in Hun-Taizi River Watershed, Northeast China
    LIU Miao, HU Yuanman, ZHANG Wei, et al.
    2011 (5):  609. 
    摘要 ( 1186 )   PDF(424KB) ( 1183 )  

    This paper firstly investigated the land-use and land-cover change (LUCC) in the Hun-Taizi River watershed, Northeast China

    from 1988 to 2004 based on remotely sensed images and geographic information systems (GIS) technology. Then, using the famous land

    -use change model of Conversion of Land Use and its Effects at Small regional extent (CLUE-S), this paper simulated the land use

    changes under historical trend (HT), urban planning (UP) and ecological protection (EP) scenarios considering urban planning and

    ecological protection over the next 20 years. The simulated results under UP scenario in 2020 were compared with the planning map to

    assess the feasibility of using land-use change model to guide regional planning. Results show that forest land, dry farmland, paddy, and

    shrub land were the main land-use categories. Paddy and dry farmland being converted to urban area and rural settlement characterized

    the land-use change from 1988 to 2004. The main land-use categories changed over time. Landscape-pattern fragmentation will be

    worse under HT and UP scenarios, but better in EP scenario. The comparing results of simulated map with planning map in 2020 show that

    land-use change model is powerful tool to guide regional planning. Land-use scenarios can support regional planning and policy-making

    through analyzing future consequences scientifically.

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    Changes of Residential Land Density and Spatial Pattern from 1989 to 2004 in Jinan City, China
    YIN Haiwei, KONG Fanhua, ZHANG Xiang
    2011 (5):  619. 
    摘要 ( 1031 )   PDF(569KB) ( 1343 )  

    Urban sprawl is driven by a myriad of factors, the predominant one of which is the development of residential land. Selecting

    part of Jinan City for a case study, we use the landscape metric of percent of landscape (PLAND) to capture residential land growth and

    density changes in 1989, 1996 and 2004 to illuminate the dynamic process of residential land development. The results indicate that the

    moving window method and the landscape metrics method are efficient ways to describe residential land density. The residential land

    showed the greatest change among the built-up land with 1995.68 ha from 1989 to 2004, which is mainly transformed from agriculture

    land and green space. The urban center area of study area is primarily covered with medium density residential land, and surrounded by

    high density residential land. The development pattern of residential land exhibited both fill-in (new growth occurs through infilling the

    free spaces within the developed area) and sprawl processes, influenced by a series of factors, such as urban development policy,

    conservation of springs, recreational and aesthetic amenities. The findings of the study will help to guide urban planning with a focus on

    the management and protection of the environment and resources.

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    Perception and Attitudes of Local Communities Towards Wild
    Elephant-related Problems and Conservation in Xishuangbanna, Southwestern China
    HE Qingcheng, WU Zhaolu, ZHOU Wai, DONG Rui
    2011 (5):  629. 
    摘要 ( 1115 )   PDF(195KB) ( 1500 )  

    The problem of wild elephants, or human-elephant conflict (HEC), influences the daily life of local communities and hinders the

    conservation of wild elephants. The perception and attitudes of local communities who inhabited the frontiers between human activities

    and wild elephant movement are important to the mitigation of the HEC and conservation of wild elephants. To analyze the perception

    and attitudes of local communities, the Participatory Rural Appraisal (PRA) was used in the investigation of 423 interviewees from 22

    villages in Xishuangbanna from July 2009 to February 2010. The results indicated that local communities had their views on the elephant-

    related problems. In field survey, we found that 66.5% of interviewees were willing to support, participate in, and assist in the

    conservation of wild elephants; 33.5% of interviewees were opposed or indifferent to such conservation, because their livelihoods and

    even their lives were endangered by wild elephants. These views and attitudes were influenced by local communities′ perception of HEC,

    education level, gender and self-interest. Therefore, it is necessary to analyze the diverse views among local communities and balance

    profits and costs in addressing HEC.

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