水分调控对水稻根际土壤及产量的影响

Effects of Water Regulation on Rhizosphere Soils and Yield of Rice

通过盆栽试验,分析了不同水分调控处理下水稻产量及水稻根际土壤氧化还原电位(Eh)和微生物的变化。结果表明,干湿交替处理下土壤Eh升高,提高了土壤的通气性,细菌、放线菌活性和数量都呈增加趋势,促进水稻根系生长;其中W2处理水稻各生育期的干物质累积量、收获指数、产量及其构成(穗粒数、结实率和千粒质量)均最高。W2处理是获得高产稳产的最佳水分调控方式。

Pot experiments were conducted to analyze the changes of rice yield, rhizosphere soil redox po- tential （Eh） and soil microbial biomass in different water treatments. The results showed that：under wet- ting-drying alternation irrigation, Eh increased and soil aeration was improved, which caused the increase of the activity and amount of bacterium and actinomycetes and improved the root growth. The dry matter accumulation, harvest index in all periods, yield, grain number, seed setting rate and thousand grain weigh were the top in treatment W2 . So, treatment W2 was the optimal water regulation to obtain higher and stable yield.