| How to deatase the greenhouse gas emission in farmland is one of the hot spot in sustainableagriculture.Recently research focused on farming system, field management measures and emission reductioneffect direction, intercropping in greenhouse gas emissions research relatively weak. In intercropping groups,What are the characteristics of farmland greenhouse gas emissions? What are the discharge mechanism andinfluencing factors? These are all lack of theoretical basis. Through the field experiment, this paper discussesemissions of CO-2and N2O between maize intercropping peas and the corresponding sole plant in different level ofnitrogen: no nitrogen (N1), local habits level of nitrogen with15%reduction (N2), local habits level of nitrogen(N3):1. CO2emissions flux of intercropping farmland is greater than that of two soles cropping. With the increaseof nitrogen application rate the CO2emission flux increased, in higher N treatment was higher than that in lowerN treatment. Sole corn grow before peas harvest,farmland CO2emissions flux under N2and N1conditionincreased6.18%and-0.87%compared with N3;in corn intercropping pea, Compared withN2and N1,N3increasedthe5.16%and13.97%respectively. The average CO2emission flux in three kinds of planting mode relations for:intercropping> sole corn> sole pea, as compared with sole, intercropping increased12.93%and14.37%respectively. Sole corn grow after Peas harvest,farmland CO2emissions flux under N3condition increased9.27%and21.36%compared with N2and N1respectively; in intercropping, compared with N2and N1,N3increased the5.16%and13.97%respectively; average CO2emissions of corn intercropping increased24.70%than sole corn.Under the same level of nitrogen,CO2emissions in intercropping before peas harvest was more than two sole with12.99%and14.36%respectively, meanwhile, after peas harvested,7.94%increased.2. N2O emissions flux of intercropping farmland is smaller than that of two soles. Along with the increase ofnitrogen, N2O emission flux is getting higher. Sole corn grow before peas harvest,farmland N2O emissions fluxunder N3condition increased21.95%and40.27%compared with N2and N1respectively;in sole pea, comparedwith N2and N1,N3increased the56.44%and32.59%respectively; in corn and pea interplanting,N3increased48.06%and23.16%compared with N2and N1respectively; sole corn grow after peas harvest,farmland N2Oemissions flux under N3condition increased40.01%and29.93%, compared with N2and N1respectively; in cornand pea intercropping,N3increased26.48%and11.78%,compared with N2and N1respectively; The averageN2O emission flux in three kinds of planting mode relations for: sole pea>intercropping> sole corn, ascompared with intercropping and sole corn, sole pea increased22.40%and37.48%respectively. Average N2Oemissions of corn intercropping was more than sole corn by24.70%.Under The same level of nitrogen, N2Oemissions in sole pea before peas harvest was more than sole corn and intercropping with37.41%and28.74%respectively, meanwhile, after peas harvested,1.44%increased.3. Farmland CO2emissions, N2O flux and the content of soil organic matter, total nitrogen and C/N into significant positive correlation; CO2emissions, N2O flux and geothermal at5cm and10cm is a significantpositive correlation, however,with the deeper soil temperature of relevance not significant. In the whole growthcrops CO2, N2O emissions and flux between three levels water content into0-30cm were negative correlation, butno significant correlation between each other.4. Cropping patterns affect soil moisture and soil temperature, nitrogen fertilizer influence soil organic matterand total nitrogen content. Before peas harvest, organic matter content of three soil model relations for: sole pea>intercropping> sole corn, as compared with i intercropping and sole corn, sole pea increased0.93%and5.01%respectively. After peas harvest, organic matter content of sole was more than intercropping by1.40%. Beforepeas harvest, soil total nitrogen content elations for: sole corn>intercropping> sole pea,as compared withintercropping and sole pea, sole corn increased4.78%and12.25%respectively. After peas harvest, organicmatter content of intercropping was more than sole0.99%.In the whole growth period crops, the same nitrogen treatment, three planting mode of soil moisture contentis no significant difference; in the same planting mode, along with the increase of nitrogen, moisture content alsowith the increase, but with N2and N3,there were no significant difference of soil water content. In the wholegrowth period crops, the same nitrogen treatment, three planting mode of soil moisture content is no significantdifference; in the same planting mode, along with the increase of nitrogen, moisture content also with the increase,but with N2and N3,there were no significant difference of soil water content. In sole corn,moisture content of N2in the whole growth period grew by an average of4.78%more than N1,meanwhile,N3was more than N1by5.95%.In sole pea,moisture content of N2in the whole growth period grew by an average of0.90%more thanN1,meanwhile,N3was more than N1by6.95%.In intercropping,moisture content ofN2in the whole growth periodgrew by an average of0.93%less than N1,however,N3was more than N1by2.05%.The results showed that in threeplanting model, soil moisture average content of intercropping was minimum.Under The same level of nitrogen, before the peas harvest, temperature of three planting mode in0-15cmsoil relations for: sole corn> intercropping> sole pea, average temperature of sole corn was more thanintercropping and sole pea by5.98%and4.95%℃respectively. After pea harvest, the relations for: intercropping> sole corn,2.73%increased. |
PDF Full Text Request