黄河三角洲草地退化的研究

黄河三角洲位于东经118°7′—119°10′,北纬36°56′—38°12′;东自山东省小清河口,西至徒骇河口,以利津县宁海为顶点向渤海湾呈扇形分布。自50年代以来,随着国营及地方农场的建立以及人口的不断增长,这一地区的草地资源得到了广泛的开发利用。但是,由于一些单位只顾盲目地开垦草地和过度放牧、割草,30多年来整个黄河三角洲盐碱化、退化草地达6.67×10~4ha多,约占当地草地总面积的40%。本文研究了该地区草地退化的现状并就退化程度与累计开发时间的关系初步进行了数

Grassland Degradation in the Yellow River Delta

Grasalands under various exploitation stages in the Yellow River Delta were examined quantitatively, and three equations were established between the variations of height, coverage and biomass of plant community and the accumulative development years. It was concluded that the height, coverage and biomass of plant community were reduced with time under the influences of over-grazing and excessive cutting. Corresponding measures should be adopted for protecting the grassland resources, e.g., separating grazing-and cutting areas, controlling the time and intensity of grazing and cutting, and reducing the amount of livestocks in the grassland.