At a long - term scale , the main driving forces to the land use option in the fgtz are the immigrant pressures to this area and the tensile force from farming pressure , but the restriction of land use was caused by eco - environmental vulnerability ( 1 )从长时间尺度分析，农牧交错带土地利用选择的主要动力是中国人口增长形成的向本区的移民压力和随之而来的农耕文化的张力，而阻力则是农牧交错带生态环境的脆弱性对土地利用的限制。
Many factors have a great effect on bird community , such as elevation , vegetation variation , type of habitat , human disturbance and ecotone . the guild is the result of competition and evolution , which is often classified according to the nesting , the foraging and the behaviour 在研究环境因子对鸟类群落的影响时，主要考虑的因子为植被的垂直格局和水平格局、植被演替、生境类型、栖息地结构、海拔、景观破碎、生态交错带等。
Now the systematic research on land use change and construction of ecology in urban - rural ecotone lies in a preliminary phase , especially it is lack the whole development target and planning to how to maintain the complete of the district ecosystem system in rapid urbanization process 我国对城乡交错带的土地利用变化及生态建设研究尚处于起步阶段,尤其是在推进城市化发展中如何维持区域生态系统的完整性方面缺乏整体发展目标和规划。
Steppe diversity , however , is characterized by higher plant diversity in the ecotone , especially in the forest - meadow region . diversity indices of plant communities reached peak values at the boundaries between the ecotone and the forest zone or the steppe zone , and between the forest - meadow region and the meadow - steppe region within the ecotone 在森林-草原交错带多样性指数较高，表现在多样性指数在森林-草原交错带与森林带和草原带之间以及森林-草原交错带内森林草甸区和草甸草原区之间的边界不同程度地出现峰值。
The concept , scope , occurrence , development , dynamic mechanism and the influencing factors of urban - rural ecotone were discussed in this paper . to guide the land use development in the urban - rural ecotone , the principles and methods for optimal allocation of land resource were researched and the limited land resource was allocated in this study 本文通过对城乡交错带概念、范围、发生、发展、演替规律及其驱动力影响因素的研究，结合城乡交错带土地利用研究的基础理论，探讨了土地资源优化配置的原理和方法，并对有限的土地资源优化配置进行了探索，以指导城乡交错带土地利用的健康发展。
