【摘要】：為了揭示干旱半干旱區(qū)高寒濕地不同水分梯度對土壤呼吸規(guī)律的影響,以及土壤溫度與含水量對土壤呼吸影響的差異性,以新疆巴音布魯克天鵝湖高寒濕地為研究對象,在2014年植物生長季利用LI-8100土壤碳通量自動測量系統(tǒng)對不同水分條件(常年積水區(qū)、季節(jié)性積水區(qū)、常年干燥區(qū))下的土壤呼吸速率進(jìn)行測定,分析土壤呼吸日變化、季節(jié)性變化特征及其與土壤溫度、土壤體積含水量的關(guān)系.結(jié)果表明:1不同水分條件下巴音布魯克天鵝湖高寒濕地土壤呼吸速率日變化均呈明顯的單峰曲線,常年積水區(qū)、季節(jié)性積水區(qū)、常年干燥區(qū)土壤呼吸速率最大值分別為1.97、7.39、8.83μmol/(m2·s),均出現(xiàn)在13:00—15:00;土壤CO2日累積排放量季節(jié)性變化明顯,差異性達(dá)到極顯著水平(P0.01),三者的最大值分別為0.12、0.45、0.40 mol/m2,地表積水顯著抑制了土壤呼吸,提高了土壤碳穩(wěn)定性.2不同水分條件下土壤呼吸速率與土壤溫度、土壤體積含水量之間均呈極顯著正相關(guān)(P0.01),常年積水區(qū)、季節(jié)性積水區(qū)和常年干燥區(qū)的Q10(土壤呼吸溫度敏感性)差異性極顯著(P0.01),其大小表現(xiàn)為常年干燥區(qū)(1.54)常年積水區(qū)(2.22)季節(jié)性積水區(qū)(3.36),各水分區(qū)域6月典型日的Q10最大,表現(xiàn)為常年干燥區(qū)(2.56)季節(jié)性積水區(qū)(4.30)常年積水區(qū)(4.75),說明水分條件顯著影響Q10.3巴音布魯克天鵝湖高寒濕地土壤呼吸受地下5 cm處土壤溫度(T)與0~5 cm土壤體積含水量(W)的綜合影響,季節(jié)性積水區(qū)土壤呼吸速率與二者之間滿足最佳擬合模型Rs=-1.113+0.041W-0.366T+0.008WT,常年干燥區(qū)則滿足最佳擬合模型Rs=1.470+0.023W-0.027T+0.002WT.
[Abstract]:In order to reveal the effects of different water gradients on soil respiration in arid and semi-arid alpine wetland and the difference between soil temperature and water content on soil respiration, the alpine wetland of Bayinbrook Swan Lake in Xinjiang was studied. In the plant growth season of 2014, the soil respiration rate under different water conditions (perennial hydrops, seasonal hydrops, perennial dry areas) was measured by LI-8100 soil carbon flux automatic measurement system, and the diurnal variation of soil respiration was analyzed. Seasonal variation and its relationship with soil temperature and soil volume water content. The results showed that: (1) the diurnal variation of soil respiration rate in the alpine wetland of Bayinbrook Swan Lake under different water conditions showed obvious single peak curve, perennial hydrops and seasonal hydrops. The maximum soil respiration rate in dry area was 1.97 ~ 7.39 渭 mol/ (m ~ 2 s),) at 13: 00-15: 00; The diurnal cumulative emissions of soil CO2 varied significantly (P0.01), and the maximum values of the three levels were 0.120.45 and 0.40 mol/m2, respectively, which significantly inhibited soil respiration. The soil carbon stability was improved. 2 the soil respiration rate was positively correlated with soil temperature and volumetric water content under different water conditions (P0.01), and there was no significant correlation between soil respiration rate and soil temperature (P0.01). The Q10 (soil respiration temperature sensitivity) of seasonal hydrops and perennial dry areas was significantly different (P0.01), and its size was as follows: perennial dry area (1.54), perennial hydrops area (2.22) and seasonal stagnant area (3.36). The Q10 of the typical days in June was the highest in each water area, showing that the seasonal water accumulation area (4.30) was perennial dry area (2.56), and the seasonal water accumulation area (4.75). The results showed that soil respiration in Q10.3 Bayinbrook Swan Lake alpine wetland was significantly affected by soil temperature (T) at 5 cm underground and soil volume water content (W) at 0 5 cm. The optimum fitting model Rs=-1.113 0.041W-0.366T 0.008 WTbetween soil respiration rate and soil respiration rate in seasonal hydrops and Rs=1.470 0.023W-0.027T 0.002 WT2 in perennial dry area were satisfied.
【作者單位】： 新疆農(nóng)業(yè)大學(xué)草業(yè)與環(huán)境科學(xué)學(xué)院新疆土壤與植物生態(tài)過程重點(diǎn)實(shí)驗(yàn)室;
【基金】：新疆農(nóng)業(yè)大學(xué)草業(yè)科學(xué)國家重點(diǎn)學(xué)科項(xiàng)目(XJCYB-2012-02) 國家自然科學(xué)基金項(xiàng)目(41305136)
【分類號】：S151.9

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