[Effect of land-use change on soil habitat in north Hebei plateau during last 50 years].

The change of soil habitat in an area depends on the land-use and cover change in the area to a great extent. Analysis of soil data in north Hebei plateau during last 50 years confirmed that the land-use change, i.e., the disorder reclamation of a large stretch of natural grassland into cultivated land and the extensive farming, had a series of negative effects on the soil habitat, and made the soil nutrients decreased. During last 50 years, the total and available amount of soil organic matter, N, P, and K decreased by 36.90%, 67.77%, 44.44%, 34.15%, 32.22%, 58.90% and 35.29%, respectively, and the granulometric contents of sand, silt and clay also varied by 18.24%, 19.55%, and 12.29%, respectively, which revealed that in order to ensure the land quality in the regionally important but vulnerable habitat area against the effect of land-use change and its possible degradation with time and to be in sustained dynamic equilibrium, it is necessary to take reasonable fertilization and reliable technical measures.