土壤2016，Vol.48Issue(6)：1151-1158,8.DOI:10.13758/j.cnki.tr.2016.06.013
长期深窄沟排水对冷浸田土壤脱潜特性及水稻产量的影响
Effects of Long-term Deep-narrow Drainage Ditches on Degleyfication Characteristics of Cold-waterlogged Paddy Soil and Rice Yield
摘要
Abstract
Cold-waterlogged paddy fields across Jiangnan rice-growing regions belong to low-yield paddy fields. Deep-narrow drainage is beneficial for such fields in improving grain yield. In this paper, the effects of long-term deep-narrow drainage on the characteristics of cold-waterlogged paddy soil and the yield of rice were studied, using a 30-year investigation system in Shunchang County, Fujian Province. The results showed that compared with the typical cold-waterlogged paddy soil (more than 75 m distance from drainage), the soil Eh was increased by 288.2%–323.4% in long-term deep-narrow drainage paddy soil (within 25 m distance from drainage). And the water contents were decreased by 7.5%–36.2% and the concentrations of total reducing agents, Fe2+and Mn2+ were decreased by deep-narrow drainage. The pH, MBC and MBN contents were increased by 0.13–0.69, 66.0%–99.0% and 77.0%–275.1% respectively in paddy soils within 25 m distance from deep-narrow drainage, the nutrient availability and soil tilth were improved and then the agricultural machinery could work in the field within 25 m distance from drainage. The intensity of soil reduction is one of the key elements for crop growth in cold-waterlogged paddy fields. The mineralization of soil organic matter and the activity of soil microbe were improved by drainage and then crop yields were increased by 6.6%–20.7%, and the increasing range of yield was decreased with the distance increasing from drainage. In a word, there was a significant positive impact of deep-narrow drainage within 25 m distance on the characteristics of cold-waterlogged paddy soil and the yield of crop.关键词
深沟排水/冷浸田/还原性物质/脱潜育化/水稻产量Key words
Deep-narrow drainage ditch/Cold-waterlogged paddy field/Reducing agents/Degleyfication/Rice yield分类
农业科技引用本文复制引用
林诚,李清华,王飞,刘启鹏,林丽红,何春梅,钟少杰..长期深窄沟排水对冷浸田土壤脱潜特性及水稻产量的影响[J].土壤,2016,48(6):1151-1158,8.基金项目
公益性(农业)行业专项(201003059-08)和福建公益类科研院所基本科研专项(2015R1022-5；2016R1021-2)资助。 （农业）
