长江中游潜沼化土壤的限制因子及其对策研究

研究表明，地下水和单一的种植结构与利用方式，是长江中游地区潜沼化土壤生产力的主要限制因子，在调查和田间试验的基础上，在国家目前难以实现配套水利工程设施的条件下，提出了以生物措施为主，结合小型工程措施进行综合改良利用，治渍改土的切实可行的方案，在优化农业结构的前提下，比较了诸多优化模式，通过田间试验，筛选出诸如退田还湖，种植水生经济植物，垄稻沟鱼及各种轮作方式，同时适当引进耐潜作物品种，实行配方施肥

STUDIES ON LIMITING FACTORS IN THE PRODUCTIVITY AND WAYS FOR THE UTILIZATION AND AMELIORATION OF GLEYED AND SWAMPED SOILS IN THE MIDDLE BASIN OF THE YANGTZE RIVER

The research shows that high groundwater table and single-crop farming system were the most important limiting factors in the productivity of gleyed and swamped soils in the middle basin of the Yangtze river. Based on the investigation and the field experiments, it is suggested that, under the present conditions that large scale hydraulic engineering projects can not be realized, onefeasible means for preventing the soil from waterlogging is biological practices combined with small scale engineering measures. In order to optimize the agricultural structure, several patterns including returning of cultivated land into lake, planting of economic hygrophytes, planting of rice on the ridge and culturing of fish in the ditch as well as appropriate crop-rotation systems were screened through field experiments. Besides, the proper planting of gley resistant breeds and the rational fertilization have been shown to bring about a marked positive effect.The study also showed that together with the increase in production an economic benefit was obtained.