黄淮海平原生态区划

黄淮海平原是我国最大的冲积平原和重要农业产区,包括冀鲁豫苏皖京津七省市平原地区.在特定的生物地理条件下,它成为一个独立的地域性生态系统.黄淮海平原生态系统是复杂的和不稳定的,历史上经常发生旱涝盐碱灾害,并交错危害,严重地影响农业生产的发展.

ECOLOGICAL REGIONALIZATION OF HUANG-UAI-HAI PLAIN IN CHINA

The Huang-Huai-Hai plain is one of the largest alluvial plains and it is also an important agricultural region in China.It is mainly Formed by the flooding and sedimentation of water system of the Huang,Huai and Hai rivers.Due to the flat relief and poor drainage,there is a large area of saline soil of which the groundwater is salty in the central and eastern portion of the plain.This area belongs to the semihumid and semi-arid climatic zone.Owing to the influence of Pacific monsoon,it is dry in spring and rainy and flooding in summer and autumn.The crop yield is quite unstable.Under the specific biogeographical condition,an unique regional ecosystem is formed in the plain;and the alternation of drought,flooding,salinization and alkalination induce the extreme complication and unstability of the ecosystem in this region which seriously influences the development of agricultural production and national economy.