本文選題：麻櫟林 + 氣候過渡帶�。� 參考：《生態(tài)學報》2017年21期

【摘要】：土壤呼吸是陸地生態(tài)系統(tǒng)碳循環(huán)的關鍵環(huán)節(jié)之一。隨著極端氣候事件的頻發(fā),森林蟲害的發(fā)生頻率和強度也趨于增加,森林蟲害爆發(fā)已經(jīng)是影響森林生態(tài)系統(tǒng)碳循環(huán)過程的一種重要的自然干擾。氣候過渡帶典型森林生態(tài)系統(tǒng)蟲災的爆發(fā)是否會影響土壤的碳排放過程目前仍不清楚。本研究利用雞公山地區(qū)麻櫟-楓香混交林大規(guī)模爆發(fā)食葉性害蟲的機會,比較蟲災爆發(fā)當年(2014)與正常年份(2015)的土壤碳排放通量,以闡明森林蟲災爆發(fā)對土壤碳排放通量的影響。結(jié)果表明:蟲災爆發(fā)當年7、8、9、10月份土壤平均溫度比正常年份相應各月份分別高0.26、0.51、0.83、0.07℃,土壤呼吸分別顯著提高了129.9%、77.1%、61.6%和58.9%。蟲災爆發(fā)年份生長季的平均土壤呼吸為3.55μmol m~(-2)s~(-1),比正常年份(2.77μmol m~(-2)s~(-1))高36.2%;生長季期間的平均土壤異養(yǎng)呼吸比正常年份增加了29.7%。該研究表明森林食葉蟲害的爆發(fā)至少在短期內(nèi)可導致森林土壤碳排放量呈顯著的增加趨勢,近而對森林生態(tài)系統(tǒng)土壤碳庫積累產(chǎn)生重要影響。因此,充分認識病蟲害對森林生態(tài)系統(tǒng)的干擾和影響,將有助于陸地生態(tài)系統(tǒng)碳循環(huán)的準確估算和模擬。
[Abstract]:Soil respiration is one of the key links of terrestrial ecosystem carbon cycle. With the frequent occurrence of extreme climate events, the occurrence frequency and intensity of forest pests tend to increase. Forest pest outbreaks have become an important natural disturbance affecting the carbon cycle of forest ecosystems. It is still unclear whether the outbreak of insect pests in typical forest ecosystems in the transitional zone will affect the carbon emission process of soil. In order to elucidate the effect of forest pest outbreak on soil carbon fluxes, we used the opportunity of large-scale outbreak of leaf-eating pests in Quercus acutis-Maple mixed forest in Jigongshan area to compare the soil carbon emission fluxes between the year of pest infestation (2014) and the normal year (2015) in order to elucidate the effect of forest pest outbreak on soil carbon emission flux. The results showed that the average soil temperature in October was higher than that in normal year. The soil respiration was significantly increased by 129.9% and 58.9%, respectively. The average soil respiration in the growing season was 3.55 渭 mol / m ~ (-1), which was 36.2% higher than that in the normal year (2.77 渭 mol ~ (-2), and the average soil heterotrophic respiration during the growing season was 29.7 ~ (th) higher than that in the normal year. This study shows that the outbreak of forest leaf-eating pests can lead to a significant increase in forest soil carbon emissions in at least a short period of time, which has an important impact on the accumulation of soil carbon pool in forest ecosystem. Therefore, it is helpful to estimate and simulate the carbon cycle of terrestrial ecosystem by fully understanding the disturbance and influence of pests and diseases on forest ecosystem.
【作者單位】： 河南大學生命科學學院河南省全球變化生態(tài)學國際聯(lián)合實驗室;洛陽理工學院;黃河水利職業(yè)技術學院;信陽市南灣實驗林場;河南省雞公山國家級自然保護區(qū)管理局;
【基金】：國家自然科學基金(31600379) 河南省高等學校重點科研項目(17A180001)
【分類號】：S714;S763

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本文編號：1961399