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以腾格里沙漠东南缘自然植被区生长的两种典型生物结皮——藓类和藻类-地衣混生结皮覆盖土壤为对象,通过设置0(对照)、1 mm(浅层)和10 mm(深层)沙埋处理,研究了沙埋对该区结皮覆盖土壤温室气体通量的影响,并通过测定沙埋后土壤温度、水分的变化,初步探讨了沙埋影响生物结皮覆盖土壤温室气体通量的环境机制.结果表明:沙埋显著增加了两类结皮覆盖土壤的CO_2释放通量和CH4吸收通量(P<0.05);但对N_2O通量的影响因沙埋厚度和结皮类型的不同而异:深层沙埋(10 mm)显著增加了两类结皮覆盖土壤的N_2O吸收通量,浅层沙埋(1 mm)仅显著降低了藓类结皮覆盖土壤的N_2O吸收通量,而对混生结皮覆盖土壤的N_2O通量影响不显著.沙埋显著增加了两类结皮覆盖土壤的表层温度和0~5 cm深土壤湿度,从而增加了其CO_2释放通量.但是沙埋引起的土壤温湿度的变化与CH_4和N_2O通量变化的相关性不显著,说明沙埋引起的土壤温湿度变化不是影响其CH_4和N_2O通量的关键因子.
Two typical bio-crusts, moss and algae-lichen mixed with crust-covered soil, were grown in the natural vegetation area on the southeastern margin of the Tengger Desert, and were set up with 0 (control), 1 mm (Deep) sand burial treatment. The effects of sand burial on soil GHG flux in this area were studied. By measuring the changes of soil temperature and water content after sand burial, the effects of sand burial on soil cover greenhouse The results showed that the sand burial significantly increased the CO 2 flux and CH 4 fluxes of two soil cover-covered soils (P <0.05), but the effect on N 2 O flux was mainly attributed to the sand burial thickness and knot The depth of the sand burial (10 mm) significantly increased the N 2 O fluxes of two types of crust-covered soil. The shallow sand burial (1 mm) only reduced the N 2 O absorption of the moss-covered soil Fluxes, but had no significant effect on the N_2O fluxes of the soil covered by the mixed crust.Furthermore, the sand burial significantly increased the surface temperature of the two crust-covered soils and the soil moisture of 0 ~ 5 cm, which increased the CO2 flux. However, the changes of soil temperature and humidity caused by sand burial and the changes of CH 4 and N 2 O fluxes Correlation is not significant, said Martinez buried soil temperature and humidity changes are not due to key factors affecting its CH_4 and N_2O flux.