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试验研究表明,在春小麦全生育期进行补充灌溉和升高CO2浓度能够有效提高田间生态系统边缘效应。与没有CO2浓度升高比较,当CO2浓度升高40~160μmol/mol时,春小麦田间生态系统边缘效应的面积增加1.8~3.6 m2。在春小麦全生育期补充灌溉60 mm与补充灌溉30 mm比较,田间生态系统边缘效应有显著变化。特别是将CO2浓度升高与补充灌溉进行组合,较没有CO2浓度升高与补充灌溉比较,春小麦田间生态系统边缘效应面积提高了300%~500%。同时研究还表明,在春小麦全生育期CO2浓度升高与补充灌溉可以显著提高春小麦田间生态系统边缘效应系数。CO2浓度升高与补充灌溉进行组合较没有CO2浓度升高与补充灌溉比较,边缘效应系数提高4.0~6.7。因此,CO2浓度升高与补充灌溉组合对提高春小麦边缘效应有显著作用。
Experimental studies show that supplementing irrigation and increasing CO2 concentration during the whole spring wheat growing period can effectively increase the edge effect of the field ecosystem. Compared with no increase of CO2 concentration, the area of edge effect of spring wheat increased by 1.8-3.6 m2 when the CO2 concentration increased by 40-160 μmol / mol. Compared with the supplementary irrigation of 60 mm and the supplementary irrigation of 60 mm during the whole growth period of spring wheat, the marginal effect of field ecosystem changed significantly. In particular, increasing the CO2 concentration in combination with supplementary irrigation increased the edge effect area of spring wheat ecosystem by 300% ~ 500% compared with that without supplementary CO2. At the same time, the study also showed that in the whole growth period of spring wheat CO2 concentration and supplemental irrigation can significantly increase the edge effect coefficient of spring wheat ecosystem. Compared with the increase of CO2 concentration and supplemental irrigation, the edge effect coefficient increased by 4.0-6.7 compared with the increase of CO2 concentration. Therefore, the combination of elevated CO2 and supplemental irrigation has a significant effect on increasing the edge effect of spring wheat.