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2009年4—10月,通过田间试验,以传统无膜漫灌为对照,研究了膜下滴灌对我国新疆棉田生态系统净初级生产力、土壤异氧呼吸和CO2净交换通量的影响.结果表明:膜下滴灌和无膜漫灌处理下,棉田生态系统净初级生产力、土壤异氧呼吸通量和CO2净交换通量均呈先增大后减小的变化趋势.与无膜漫灌相比,膜下滴灌显著提高了棉花地上、地下生物量和净初级生产力,降低了土壤异氧呼吸通量.在整个生长季节,膜下滴灌处理的年土壤异氧呼吸通量为214gC·m-2,低于无膜漫灌处理的317gC·m-2;膜下滴灌处理的棉花年净初级生产力为1030gC·m-2,显著高于无膜漫灌处理的649gC·m-2;膜下滴灌处理比无膜漫灌处理多固定大气CO2479gC·m-2.膜下滴灌栽培措施既提高了作物生产力,又降低了土壤CO2排放,是干旱地区一种重要的农业固碳减排措施.
From April to October in 2009, field experiments were conducted to compare the effect of drip irrigating film on the net primary productivity, soil oxygen respiration and net CO2 exchange fluxes of cotton fields in Xinjiang, China. The results showed that: Under the condition of drip irrigation under mulch and without flooding treatment, net primary productivity, soil oxygen oxygen uptake flux and net CO2 exchange flux of cotton ecosystem increased first and then decreased, compared with no membrane diffuse irrigation Drip irrigation significantly increased cotton aboveground and underground biomass and net primary productivity, and decreased soil oxygen oxygen flux. The annual soil oxygen flux was 214gC · m-2, which was lower than The net primary productivity of cotton under drip irrigation was 1030gC · m-2, which was significantly higher than that of non-membrane diffused irrigation (649gC · m-2) The treatment of multiple fixed atmosphere CO2479gC · m-2. The drip irrigation cultivation measures not only increased crop productivity but also reduced soil CO2 emission, which was an important carbon sequestration reduction measure in arid areas.