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首页> 外文期刊>African Journal of Biotechnology >Soil carbon dioxide (CO2) efflux of two shrubs in response to plant density in the northern Loess Plateau of China
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Soil carbon dioxide (CO2) efflux of two shrubs in response to plant density in the northern Loess Plateau of China

机译：黄土高原北部两种灌木的土壤CO 2排放对植物密度的响应

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Although plant density should affect soil carbon dioxide (CO2)?efflux and carbon cycling in semi-arid regions, the effects of plant density on soil CO2?efflux are not well known. This study was performed to investigate the responses of soil CO2efflux of two dominant shrubs (Caragana korshinkii?and?Salix psammophila) to plant density in the northern Loess Plateau of China. Two plant density treatments, low and high, were included for?C. korshinkii?(average 20,000 plants ha-1?and average 66,667 plants ha-1) and?S. psammophila?(average 9,583 plants ha-1?and average 31,250 plants ha-1). Soil CO2?efflux was measured every other day with an Ultra-light portable photosynthesis system (CI-340, CID Inc., USA) from July to October 2009. Soil CO2?efflux with high plant density was significantly larger than that with low plant density for both shrub species. Plant density did not change the temporal pattern of CO2?efflux during the study period. Our results indicated that root biomass and aboveground biomass were the significant biotic factors mediating the response of soil CO2?efflux to plant density for the two shrubs. Moreover, both soil water contents in the 0 - 6 cm soil layer and in deeper soil layer partly regulated the responses of soil CO2?efflux to the shrub density treatments in the semi-arid region.
机译：尽管植物密度应该影响半干旱地区土壤二氧化碳（CO2）的通量和碳循环，但是植物密度对土壤二氧化碳（CO2）的通量的影响尚不清楚。本研究旨在研究中国黄土高原北部两种优势灌木（柠条锦鸡儿（Caragana korshinkii）和Salix psammophila）对土壤CO2排放的响应。低温包括两种植物密度处理，低和高。 korshinkii？（平均20,000株ha-1？平均66,667株ha-1）和？S。 psammophila？（平均9,583株ha-1和平均31,250株ha-1）。 2009年7月至10月，使用超轻便携式光合作用系统（CI-340，CID Inc.，美国）每隔一天测量一次土壤CO2排放量。高植物密度的土壤CO2排放量显着大于低植物密度的土壤CO2排放量。两种灌木的密度。在研究期间，植物密度没有改变CO 2流出的时间模式。我们的研究结果表明，根系生物量和地上生物量是介导两种灌木的土壤CO2通量对植物密度响应的重要生物因子。此外，在半干旱地区，0-6 cm土层和较深土层的土壤水分均部分调节了土壤CO2通量对灌木密度处理的响应。

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