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河口沼泽因地理位置的特殊性,极易遭受外来生物的入侵。刈割是治理河口沼泽外来入侵种互花米草(Spartina alterniflora)常用的物理方法之一。在涨潮前和落潮后两个时段,采用静态箱—气相色谱法,连续7d采集气样,研究了刈割治理对闽江河口鳝鱼滩互花米草沼泽生态系统CO2和CH4排放通量的短期影响。结果表明,经刈割治理的互花米草沼泽样地CO2和CH4排放通量都显著低于对照样地(p<0.05);其中,CO2排放通量减小的幅度大于CH4排放通量;涨潮前,刈割样地CO2排放通量在第6天开始恢复上升,CH4排放通量的增加早于CO2。落潮后,刈割样地CO2排放通量与5cm土温显著负相关(n=21,r=-0.704,p<0.01);对照样地CH4排放通量与表层土壤盐度显著负相关(n=21,r=-0.611,p<0.01)。
Due to the particularity of the geographical position, estuarine swamps are extremely vulnerable to invasion by alien organisms. Mowing is one of the most commonly used physical methods for controlling invasive alien species Spartina alterniflora in estuarine swamps. In the two periods before and after the ebb tide, static box - gas chromatography was used to collect gas samples continuously for 7 days. The effects of cutting management on CO2 and CH4 flux of Spartina alterniflora swamp ecosystem at the Yongjiang River estuary were studied. Short-term impact. The results showed that the CO2 and CH4 fluxes of the treated Spartina alterniflora swamp were significantly lower than that of the control plots (p <0.05); the CO2 flux decreased more than the CH4 flux; Before the tide, the fluxes of CO2 emissions from the cutting plot began to recover on the 6th day, and the emission of CH4 increased earlier than that of CO2. After ebb tide, the flux of CO2 in the mowed plot was negatively correlated with the soil temperature of 5 cm (n = 21, r = -0.704, p <0.01). The flux of CH4 in the control plot was negatively correlated with the soil salinity = 21, r = -0.611, p <0.01).