本文選題：土壤碳通量 + 林齡　； 參考：《水土保持學(xué)報(bào)》2017年05期

【摘要】：基于紅外氣體分析技術(shù),對(duì)隴東黃土高原田家溝水土保持科技示范園不同林齡(12,14,15,18a)刺槐林土壤碳通量進(jìn)行定位監(jiān)測(cè),同時(shí)以荒草地為對(duì)照,分析土壤碳通量日、季變化及組分特征。結(jié)果表明:不同林齡刺槐林土壤碳通量日變化差異顯著(P0.01),日變化趨勢(shì)表現(xiàn)為晝高夜低的單峰曲線,13:00—15:00達(dá)到最大值,最小值出現(xiàn)在2:00—5:00;不同季節(jié)間土壤碳通量差異顯著(P0.01),具體表現(xiàn)為夏季春季秋季冬季,夏季土壤碳通量為冬季的8.78~20.32倍;刺槐林春季土壤碳通量以自養(yǎng)呼吸為主,夏、秋兩季以異養(yǎng)呼吸為主,冬季自、異養(yǎng)呼吸貢獻(xiàn)率基本一樣,荒草地春、夏、秋3季以異養(yǎng)呼吸為主,冬季與林地表現(xiàn)一致;刺槐林年土壤CO_2排放量隨林齡增加而增加,年排放量2 069.63~4 590.35g/m~2,荒草地土壤CO_2年排放量2 806.27g/m~2,低于18a刺槐林,高于其余各林齡。研究結(jié)果為隴東黃土高原刺槐人工林土壤的固碳效應(yīng)及經(jīng)營(yíng)措施提供依據(jù)。
[Abstract]:Based on infrared gas analysis technology, soil carbon fluxes of different forest ages in Tianjiagou soil and water conservation demonstration garden of Longdong Loess Plateau were monitored. The soil carbon fluxes of Robinia pseudoacacia forest were compared with that of barren grassland. Seasonal variation and component characteristics. The results showed that the diurnal variation of soil carbon flux in Robinia pseudoacacia stands of different ages was significantly different (P 0.01), and the diurnal variation trend was that the single peak curve of high day, high night and low night reached the maximum value, 13: 00-15: 00. The minimum value appeared at 2: 00-5: 00. The soil carbon fluxes in different seasons were significantly different (P0.01N), which showed that the soil carbon fluxes in summer, spring, autumn and summer were 8.78 ~ 20.32 times of that in winter, and the soil carbon fluxes of Robinia pseudoacacia forest in spring were mainly autotrophic respiration, summer, and summer, respectively. The contribution rate of heterotrophic respiration was basically the same in spring, summer and autumn. The annual CO_2 emission of Robinia pseudoacacia forest increased with the increase of forest age. The annual emission of CO_2 from grassland soil was 2 806.27 g / m ~ (2), which was lower than that of Robinia pseudoacacia forest for 18 years, and was higher than that of other forest ages. The results provided the basis for carbon sequestration effect and management measures of Robinia pseudoacacia plantation in Longdong Loess Plateau.
【作者單位】： 甘肅省水土保持科學(xué)研究所;中國(guó)林業(yè)科學(xué)研究院荒漠化研究所;中國(guó)水利水電科學(xué)研究院泥沙研究所;
【基金】：甘肅省水利科研計(jì)劃項(xiàng)目(2014-223-6)
【分類(lèi)號(hào)】：S714

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