摘要
草原开垦破坏草地植被,并且破坏了整个草原的生态环境,这已取得共识。然而,目前还有人想开垦呼伦贝尔天然草地来追求短期的利益。通过调查一个天然草地坡面的土层厚度和土壤水分,分析天然草地地貌部位对土层厚度和土壤水分的影响,以此为根据来阐述开垦天然草地的利害。结果表明:上部样点含水量低,坡脚和坡底样点含水量依次增加;黑土层保水性好,黄粘土层透水性差,砂土层保水性很差;坡面80%的面积黑土层小于或等于30cm,开垦压实以后厚度只能满足暂时耕作的需要。呼伦贝尔草原地形起伏较大,干旱且多大风,易发生土壤侵蚀。开垦以后将会失去保水性好的黑土层,那时,呼伦贝尔草原前景甚忧。因此,建议不应开垦呼伦贝尔草原,并给与适当保护。
Hulunbeier grassland is very important for china＇s non-pollution animal food.Additionally,it is a ecological barrier for Northeast China and North China.If it was destroyed,environment in Northeast and North China would be in danger.It is well known that cultivated grassland destroys vegetation,and damages the ecological environment of the grassland.However,currently some people always want to cultivate natural grassland for short-term economical profit.The purpose of this study is to analyze the character of soil water content and soil depth along a slope,and simply describe the advantages and disadvantages of cultivated grassland.The soil water content and soil depth of a slope was surveyed in Chenbaerhu County.The results showed： black soil layer（surface layer） has the high capacity holding water,yellow clay soil layer has the low permeability,and sand layer has the low capacity for holding water;soil depth is less than or equal to 30 cm in 80% of the slope,which is only adapted for the current tillage depth after reclamation and compaction.Hulunbeier grassland has a rolling relief and high-intensity winds.Thus,soil erosion often appears and results in a lot of soil loss.If black soil layer was eroded,soil water content and nutrients would not be enough to support plant growth.At last,desertification might be serious in the hulunbeier grassland.Thus,it is suggested that grassland should be not cultivated.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2010年第4期180-184,共5页
Journal of Arid Land Resources and Environment
基金
国家科技支撑计划项目(2008BAD98B02)资助
关键词
呼伦贝尔
天然草地
土层厚度
土壤水分
土壤侵蚀
Hulunbeier
natural grassland
soil layer depth
soil water content
soil erosion
