Soil respiration difference and benefit analysis of intercropping cotton and alfalfa in jujube orchard
Different planting patterns have different effects on soil greenhouse gas emissions,crop yield and economic benefits.In this experiment,static box method combined with gas chromatograph were used to measure the greenhouse gas emission of soil under four different planting patterns:jujube-cotton intercropping,cotton monocropping,jujube-alfalfa intercropping and alfalfa monocropping,and the yield and economic benefit were calculated and comprehensively analyzed to determine the planting pattern with the highest comprehensive income.The results showed that compared with cotton monoculture,jujube-cotton intercropping reduced CO2 emission flux by 15.78%and N2O emission flux by 76.40%.Compared with alfalfa monoculture,jujube-alfalfa intercropping decreased CO2 emission flux by 1.06%and N2O emission flux by 57.89%.Compared with jujube-alfalfa intercropping,jujube-cotton intercropping increased CO2 emission flux by 206.42%and N2O emission flux by 375.00%.The yield of cotton monoculture increased by 40.90%compared with jujube cotton intercropping.Among the two alfalfa harvests,the yield of the first alfalfa single cropping increased by 93.24%compared with the jujube-alfalfa intercropping.The yield of alfalfa monoculture in the second crop increased by 27.31%compared with jujube-alfalfa intercropping.The net income of jujube-cotton intercropping increased by 24.00%compared with cotton monoculture.The net income of intercropping two alfalfa crops increased by 35.00%compared with single cropping.Intercropping mode is beneficial to soil CO2 and N2O emission reduction.Considering greenhouse gas emission flux,yield and economic benefits,jujube-alfalfa intercropping and jujube-cotton intercropping are the planting patterns with higher comprehensive in come in this experimental area.
万方数据
维普
