灌溉方式对宁夏枸杞园土壤碳库特征及枸杞生长的影响

Effects of Irrigation Method on Soil Carbon Characteristics and Growth of Goji Berry

通过3年田间定位的枸杞灌溉试验,分析了滴灌和漫灌2种灌溉方式对旱区枸杞园土壤活性有机碳库及枸杞生长的影响。结果表明,滴灌对土壤总有机碳含量影响整体呈现出提升的作用,碳库管理指数高于漫灌处理,尤其是0~10和10~20cm表层土壤中易氧化态有机碳含量显著增加,分别提高12.99%和18.67%,且在120~140cm土层易氧化态有机碳有明显累积,提高幅度达到38.17%。采用滴灌和漫灌两种灌溉模式,枸杞总产量无明显差异,但滴灌模式下水生产率较漫灌提高112.12%,且果实等级率也有所提高。因此,针对研究区域枸杞生产管理现状,通过滴灌模式,有利于土壤有机碳质量提升,培肥枸杞果园土壤,能够满足生长需求,对实现长期可持续生产提供科学依据。

In this study, the effects of two irrigation methods, namely drip irrigation and flood irrigation, on the active organic carbon pool and goji berry growth in the dryland soil were analyzed through a three-year field experiment. The results showed that the effect of drip irrigation on the total organic carbon content of soil showed an overall improvement. The carbon pool management index(CPMI) was higher than that of flood irrigation. Especially, in the 0~10 and 10~20 cm soil layers of the topsoil, the permanganate-oxidizable organic carbon(POXC) content were increased by 12.99% and 18.67%, respectively, and the content in the 120~140 cm soil layer was also significantly higher than that in the same layer of soil compared to flood irrigation conditions, with an increase of 38.17%. The difference between the total yield of goji berry in the two irrigation modes was not obvious. However, the water productivity in drip irrigation mode was increased by 112.12% than that of flood irrigation, and the fruit grade rate was improved. Therefore, in view of the current situation of production management in the research area, the drip irrigation mode is conducive to the improvement of soil organic carbon quality, the soil fertilization of orchard and can meet the demand of plants growth, which will provide a scientific basis for achieving long-term sustainable production.