根区施用硝化抑制剂DMPP对不同栽培方式下黄瓜产量及根区温室气体排放的影响

为了研究根区施用硝化抑制剂(DMPP)对日光温室起垄内嵌式基质栽培与土垄栽培黄瓜产量及根区N2O和CO2排放的影响,设置5个处理:CK(土垄栽培,不施氮肥)、SC(土垄栽培,常规施氮肥)、SC+D(土垄栽培、常规施氮肥配施DMPP)、SSC(起垄内嵌式基质栽培、常规施氮肥)、SSC+D(起垄内嵌式基质栽培、常规施氮肥配...

Influences of DMPP on the Cucumber Yield and Root Zone Greenhouse Gas Emission under Different Cultivation Methods

To reveal the impact of DMPP on yield and emissions of N2O and CO2 in root soil of cucumber cultured by different modes in solar greenhouse, five treatments were set including CK (soil cultivation, without fertilization), SC (soil cultivation, conventional nitrogen fertilizer application), SC+D (soil cultivation, conventional nitrogen fertilizer application with DMPP), SSC (soil-ridged substrate-embedded cultivation, conventional nitrogen fertilizer application), SSC+D (soil-ridged substrate-embedded cultivation, conventional nitrogen application combined with DMPP). The influence of DMPP on N2O and CO2 emissions in the vegetable root zone and yield were analyzed. The results showed that: N fertilizer application significantly increased N2O emissions and yield of cucumber. Compared with SC treatment, the cumulative emissions of N2O and CO2 and the comprehensive warming potential of SSC were reduced by 27.9%, 30.2%, and 30.1%, respectively (P<0.05). Additionally, compared with SC treatment, SC+D treatment significantly reduced the comprehensive warming potential by 27.5%; and compared with SSC treatment, SSC+D treatment significantly reduced the comprehensive warming potential by 29.8%(P<0.05). Compared with CK, SC, SC+D, SSC and SSC+D treatments significantly increased yield by 123.7%, 138.0%, 130.0% and 138.7%, respectively (P<0.05). Last, compared with SC treatment, SSC treatment significantly increased cucumber yield and dry matter of aboveground and root systems, which were 5.1%, 8.4%, and 66.1%, respectively. The above results indicated that soil-ridged substrate-embedded cultivation under DMPP was an optimal cultivation mode.