發(fā)布時間：2018-03-02 17:26

  本文選題：土壤呼吸　切入點：一年生植物功能群　出處：《草業(yè)科學》2016年12期 　論文類型：期刊論文

【摘要】：作為草原群落重要層片的一年生植物功能群,在濕潤季節(jié)和年份高度發(fā)育補償群落生物量、維持放牧草原生態(tài)系統(tǒng)穩(wěn)定,但尚不清楚一年生植物功能群通過這一補償方式如何補償群落地上/地下生物量和影響土壤呼吸�；�2012年和2013年內(nèi)蒙古錫林郭勒大針茅(Stipagrandis)+羊草(Leymus chinensis)典型草原兩個放牧強度試驗樣地群落地上/地下生物量、土壤呼吸及相關(guān)環(huán)境因子的測定。研究表明,1)一年生植物功能群對群落生產(chǎn)力的補償作用及生長季土壤呼吸累積量在濕潤年份(2012年)均大于干旱年份(2013年);且在中度放牧處理中均顯著大于輕度放牧處理(P0.05);2)土壤呼吸與一年生植物功能群地上、地下生物量、土壤5cm溫度和土壤0-10cm含水率均具有極顯著正相關(guān)關(guān)系(P0.001)。由此表明,當放牧降低了草原群落多年生功能群生物量時,一年生植物功能群在濕潤季節(jié)和年份可補償群落生產(chǎn)力、促進土壤呼吸排放速率,進而影響草原生態(tài)系統(tǒng)碳循環(huán)過程。
[Abstract]:As an important layer of grassland community, annual plant functional group developed highly in wet season and year to compensate the biomass of the community and maintain the stability of grazing grassland ecosystem. However, it is not clear how the annual plant functional group can compensate the aboveground / underground biomass of the community and affect soil respiration through this compensation. Based on the two typical steppes, Leymus chinensis, Stipagrandises, Xilingol, Inner Mongolia, 2012 and 2013. The aboveground / below-ground biomass of the community in three grazing intensity test plots, Determination of soil respiration and related environmental factors. The results showed that the compensatory effect of annual plant functional group on community productivity and the accumulation of soil respiration in wet year (2012) were higher than that in dry year (2013), and the accumulation of soil respiration in wet year (2012) was higher than that in dry year (2013). Soil respiration and annual plant functional group were significantly higher in moderate grazing than in light grazing. The underground biomass, soil temperature (5cm) and soil moisture content (0-10cm) were significantly positively correlated with P0.0010.The results showed that, when grazing decreased the biomass of perennial functional group of grassland community, The annual plant function group can compensate the community productivity in wet season and year, promote soil respiration emission rate, and then affect the process of carbon cycle in grassland ecosystem.
【作者單位】： 內(nèi)蒙古大學生命科學學院;內(nèi)蒙古自治區(qū)氣象科學研究所;內(nèi)蒙古自治區(qū)錫林浩特國家氣候觀象臺;內(nèi)蒙古民族大學農(nóng)學院;
【基金】：國家自然科學基金項目“內(nèi)蒙古退化草原碳庫特征及其形成機理的整合研究”(31160476) 中國氣象局氣候變化專項項目“氣候變化對錫林郭勒典型草原畜牧業(yè)的影響及適應(yīng)技術(shù)研究”(CCSF201522)
【分類號】：S812
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本文編號：1557500