植物营养与肥料学报Issue(5)：1209-1216,8.DOI:10.11674/zwyf.2015.0514
地膜覆盖结合秸秆深埋条件下盐渍土壤呼吸及其影响因素
Effect of plastic mulching along with deep burial of straw on dynamics of salinized soil respiration and its affecting factors
摘要
Abstract
[Objective] Characteristics and affecting factors of soil respiration are basis of soil carbon balance. The preliminary research found that burying straw layer under 35-40 cm below the surface along with plastic mulching at the surface made a obvious effect of controlling salinity. At the same time, this treatment could affect soil micro-microbial activity and then affect soil CO2 emission. However, the relevant research in this area is still lacking, especially based on field trial, which could affect the evaluation of the combined effect of this treatment. Therefore, this study is to reveal how different tillage treatments affect saline soil respiration. [Method] Taking typical saline farmland with buried straw layer for three years in Hetao Irrigation District as the study object, this trial was to study the effect of different tillage measures, including conventional tillage(CK), conventional tillage plus plastic mulching( PM) , plastic mulching plus straw layer burial( PM+SL) and deep burial of straw layer( SL) , on dynamicchanges of saline soil respiration and its impact factors and the relationship among them. [Results] 1 ) Soil respiration rates in all tillage treatments showed a decreasing trend in the sunflower growth period, the PM+SL had the highest one in the whole growth period and the PM was the second, while the respiration rate of SL was similar to that of CK except with a higher rate at the bud stage. Meanwhile, at 10:00 and 15:00 of the flowering and mature stage, the respiration values were:PM+SL>PM >SL>CK. The average soil temperature in 0-40 cm had a same trend, and the differences among all tillage methods only appeared at the harvest period. Soil moisture content in 0-40 cm under PM+SL was the lowest in all treatments, but it had significant advantage in controlling salinity and increasing organic matter. 2 ) Soil respiration rate had a significant positive correlation ( P<0. 01 ) with soil temperature, but it had no correlations with soil moisture, soil salt content and soil organic matter. The fitting equation showed the saline soil respiration was influenced by the combined effect of soil temperature, moisture and salinity. [Conclusion]The respiration rate of saline soil in arid regions was affected by the combined effects of soil temperature, moisture and salinity, PM + SL could be used for salinity controlling and heat preservation and enhancing sunflower root growth and metabolic activity of microorganisms in this region.关键词
秸秆深埋/地膜覆盖/土壤呼吸/食葵/盐渍土Key words
straw interlayer/plastic mulching/soil respiration/sunflower/saline soil分类
农业科技引用本文复制引用
霍龙,逄焕成,卢闯,赵永敢,李玉义..地膜覆盖结合秸秆深埋条件下盐渍土壤呼吸及其影响因素[J].植物营养与肥料学报,2015,(5):1209-1216,8.基金项目
国家自然科学基金(31471455,31000692) （31471455,31000692）
公益性行业(农业)科研专项经费(201303130)资助。 （农业）
