本文關(guān)鍵詞： 氮沉降 降雨 土壤呼吸 天然常綠闊葉林　出處：《西北農(nóng)林科技大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年04期 　論文類型：期刊論文

【摘要】：【目的】探究氮沉降和降雨變化對(duì)華西雨屏區(qū)天然常綠闊葉林土壤呼吸的影響�！痉椒ā客ㄟ^(guò)野外原位試驗(yàn),設(shè)置氮沉降(N)、減少降雨(R)、增加降雨(W)和對(duì)照(CK)4個(gè)處理,對(duì)天然常綠闊葉林土壤呼吸速率、0~10cm土層土壤溫度和土壤體積含水量進(jìn)行為期1年的觀測(cè),并對(duì)以上3項(xiàng)指標(biāo)的相關(guān)性進(jìn)行分析,然后在試驗(yàn)處理的第13個(gè)月測(cè)定微生物生物量C、N含量�！窘Y(jié)果】(1)N、R和W處理的平均土壤呼吸速率分別比CK降低了29.53%,12.26%和21.18%,各處理均顯著抑制了常綠闊葉林土壤呼吸速率(P0.05)。(2)N、R、W和CK的土壤呼吸年通量分別為1 489.85,1 854.85,1 666.32和2 114.11g/m2,N、R和W處理均顯著減少了土壤呼吸年通量(P0.05)。(3)N、R、W和CK的Q_(10)(土壤呼吸對(duì)溫度的敏感系數(shù))值分別為2.37,2.98,2.43和2.53。減少降雨可能使土壤呼吸的溫度敏感性升高,氮沉降和增加降雨則降低了土壤呼吸的溫度敏感性。(4)分別采用指數(shù)模型和一元二次項(xiàng)方程擬合土壤呼吸速率與溫度和體積含水量間的回歸方程,表明土壤溫度能解釋土壤呼吸月動(dòng)態(tài)變化的83.08%~94.67%,土壤體積含水量能解釋土壤呼吸月動(dòng)態(tài)變化的63.06%~67.30%。(5)與CK相比,N、R、W處理的微生物生物量C、N含量均顯著降低�！窘Y(jié)論】氮沉降、增加降雨和減少降雨處理均顯著抑制了華西雨屏區(qū)天然常綠闊葉林的土壤呼吸。在模擬氮沉降和降水變化下,與土壤水分相比,土壤溫度是該區(qū)常綠闊葉林土壤呼吸的主要影響因素。
[Abstract]:[objective] to investigate the effect of nitrogen deposition and rainfall change on soil respiration of natural evergreen broadleaved forest in Yuping area of West China. The soil respiration rate of natural evergreen broadleaved forest was measured for one year in 10 cm soil layer, and the correlation of the above three indexes was analyzed. Then, the microbial biomass C N content was measured in the 13th month of the experiment. [results] the average soil respiration rate of the treatment with N and W decreased by 29.53% 12.26% and 21.18%, respectively, compared with CK. All treatments significantly inhibited the soil respiration rate of evergreen broad-leaved forest. The annual soil respiration fluxes were 1 489.85U 1 854.85U 1 666.32 and 2 114.11g / m 2N 2 N R and W treatments significantly decreased the annual soil respiration fluxes (P 0.05 N N RW and CK values of 2.372.982.43 and 2.53, respectively). The annual soil respiration fluxes were 2.372.982.43 and 2.53, respectively, and the annual soil respiration fluxes were 2.372.982.43 and 2.53, respectively. The annual soil respiration fluxes were 2.372.982.43 and 2.53, respectively, and the annual soil respiration fluxes were 2.372.982.43 and 2.53, respectively. The results showed that the annual soil respiration fluxes were 2.372.982.43 and 2.53, respectively. The temperature sensitivity of soil respiration is increased, The temperature sensitivity of soil respiration was reduced by nitrogen deposition and increasing rainfall. The exponential model and the quadratic equation were used to fit the regression equation between soil respiration rate and temperature and volume water content, respectively. The results showed that the soil temperature could explain the monthly dynamic changes of soil respiration, and the soil volumetric water content could explain the dynamic changes of soil respiration month. 63.060.30. 5) compared with CK, the microbial biomass (Con N) of NRW treatment was significantly lower than that of CK. [conclusion] nitrogen deposition. The soil respiration of natural evergreen broad-leaved forest was significantly inhibited by increasing rainfall and decreasing rainfall. Under the simulated nitrogen deposition and precipitation changes, the soil moisture content of the natural evergreen broad-leaved forest was compared with that of soil moisture. Soil temperature is the main influencing factor of soil respiration in evergreen broadleaved forest.
【作者單位】： 四川農(nóng)業(yè)大學(xué)林學(xué)院;
【基金】：國(guó)家“十二五”科技支撐計(jì)劃項(xiàng)目(2010BACO1A11) 四川省“十二五”農(nóng)作物育種攻關(guān)項(xiàng)目(2011NZ0098-10)
【分類號(hào)】：S714

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本文編號(hào)：1549294