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土地利用

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Nematode faunal analyses were found to be a useful method for interpreting the stress or/and nutrient conditions under different land uses.

线虫区系分析方法可用来揭示不同土地利用方式下土壤食物网的变化,为进一步研究土壤生态过程对土地利用方式的响应提供了有效的工具。

At last the paper puts forward corresponding countermeasure to the structure optimization of urban land-utilization in our country macroscopically.

最后从宏观层面对我国大城市土地利用结构优化问题进行考察,提出我国大城市土地利用结构优化的相应对策思路。

Land use structure change and change of spatial autocorrelation based on Moran's I of land use degree of Guangzhou in 1990,1995,2000 and 2004 were analyzed in the paper.

摘 要:分析了1990-2004年广州市土地利用结构的变化和基于 Moran's I 的土地利用程度空间自相关变化。

Unless since land it utilize by change watch, the with the fastest developing speed in cities and towns, the forest land , the whole area of herb ground increase very fast under the policy of grain for green, Yuan Tai station nonirrigated farmland increase by a large margin, the land of rivers and creeks is reducing, land use ratio of Jingchuan county remain to raise, the total area of use is reducing too.

土地利用变化看,城镇的发展速度最快,林地、牧草地总面积在退耕还林还草的政策下增加较快,塬台旱地大幅度增加,河川地在减少,泾川县总的未利用面积在减少,而土地的利用率有待提高。

In order to study the contribution of agricultural lands to the sustainability of mega-city area, the emergy synthesis ,developed by Odum, is incorporated in this paper to evaluate the energetic efficiency of land use.

应用Odum所建立的能值理论和方法,通过能值指标评价各类用地的土地利用效率并探讨不同农作物的农地效益,寻找农地可持续利用的途径,从而为土地使用的可持续规划提供方法上的参考依据。

Meanwhile, the land problem has already become an essential and key puzzledom during the construction of development zones.

研究开发区土地利用水平,寻找合理的管理和利用方式,促进开发区土地资源的合理配置,成为开发区发展建设中亟待解决的问题。

The analyses of social and economic development indicate that, up to 1998, the total population in Yijinholo County is 143, 949 persons, the population density is 24 persons per square kilometer, large population number results in land exploitation for food and overgrazing in rangeland. The change in temporal and spatial pattern of landuse from 1977 to 1998 demonstrates that mobile sand dunes was replaced by rangeland and woodland and partial shrubland in the middle of study area changed into rangeland and farmland from 1977 to 1987, while mobile sand dunes and rangeland transformed into shrubland and farmland in a small parts from 1987 to 1998, the above-mentioned change is proved by the change of fractal dimension index and fragmentation index at landscape and its element levels.

对近50年来伊旗社会经济发展的分析结果表明,虽然人口增长率基本上呈下降趋势,但由于人口基数较大,截至1998年底,伊金霍洛旗的人口总数达143949人,人口密度为24人/平方公里,较高的人口密度带来了更多的生存需求,使得大量的草牧场被开垦,而剩余的则严重超载。1977-1998年间伊土地利用结构总体格局变化的分析结果表明,1977-1987时段内主要是流动沙地为草牧场和乔木林地所取代,伴随着中部的部分灌木林地转换为草牧场和农地:而1987-1998时段内主要是草牧场和流沙地为灌木林地和农地特别是灌木林地所取代,而景观及各景观要素的分维度指数和破碎度指数的变化也充分证实了这一结论,虽然在前10年(1977-1987年)中大面积的灌木林被砍伐,但土地利用格局的整体变化间接地反映出该时段内荒漠化的状况正在发生逆转。

The relationship between slope and upslope drainage area is derived by regression analysis, from the relationship the characteristics of gully initiation have been analyzed. Combined with the land use information, land use impact on gully initiation threshold has also been studied.

对坡度和上游汇水面积数据作回归分析,得到坡度和上游汇水面积的关系,进而分析研究区内切沟发育的特点;结合研究区土地利用状况分析土地利用对切沟发育临界条件的影响。

To solve these problems and find out scientific and effective land managing methods for URIA, this paper focuses in the following items: I.

为缓解上述矛盾,急需分析城乡结合部的土地利用存在的问题,制定出有效的城乡结合土地利用管理办法。

III. Research on land use characteristic and land use structure evolvement of URIA.

三、城乡结合部土地利用特征与土地利用结构演变。

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