关键词: 红松阔叶混交林, 掘根倒木, 坑和丘, 微气候, 植被更新

Abstract: Chemical fertilizers are often excessively applied on vegetable field s to pursue higher yields. In some areas, the fertilization rates are several ti mes of those needed by vegetables. Nitrogen and phosphorous are obviously accumu lated in the vegetable soils, resulting in the malnutrition, excessive nitrate, and poor quality of vegetables. Furthermore, a series of environmental problems, e.g., deterioration of vegetable soil physical and chemical properties, nitrate pollution of groundwater, and eutrophication of surface water, are produced. Th is paper reviewed the present status of nitrogen and phosphorous non-point sour ce pollution from vegetable soils (accumulation characteristics of nitrogen and phosphorous and their pollution risks to water environment and vegetables), poll ution mechanisms (sources, transformation, and losses of nitrogen and phosphorou s), and control techniques (fertilization, chemical addition, nitrogen catch cro p cultivation, optimal planting system, spatial matching of source and sink land scapes, and grass buffer strip technology), aimed to supply references for the f urther study on the nitrogen and phosphorous non-point source pollution from ve getable fields.

Key words: Pinus koraiensisdominated broadleaved mixed forest, treefall, pit and mound, microclimate;, vegetation regeneration.