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    當前位置 > 首頁 > 新聞動態 > 科研動態
    成都生物所在不同森林樹種根系分泌物生態學效應研究中獲進展
    更新日期: 2019-06-21 作者: 汪其同 文章來源:生物多樣性與生態系統服務領域
    打印 文本大小:    

     森林根系分泌物輸入在根際土壤碳(C)和養分循環中發揮著極其重要的作用,已成為當前全球變化下森林地下生態學研究的關鍵環節和前沿熱點。森林根系分泌物輸入數量與質量受眾多生物與非生物因素所調控。但縱觀現有研究,大多聚焦于不同環境要素對森林根系分泌物輸入特征及其介導的土壤過程和功能的影響,而很少研究關注具有不同生物學特性的樹種(如常綠和落葉樹)之間根系分泌物輸入及其生態反饋效應差異。 

     基于此,中科院成都生物研究所森林過程與調控項目組汪其同博士在尹華軍研究員的指導下,比較分析了西南山地兩種落葉樹(蓮香樹和落葉松)和兩種常綠樹(華山松和油松)根系分泌C輸入及其介導的根際土壤N素轉化差異。研究發現,落葉樹種通常比常綠樹種釋放更多的C進入土壤,并誘導激發了更強的根際土壤N素轉化過程。推測二者差異的可能原因與兩種類型樹種具有不同的光合能力、根系特征與土壤養分有效性有關。利用國際上已公開發表的溫帶森林常綠與落葉樹種根系分泌物C輸入數據進行整合分析,也進一步印證了上述結果,即溫帶地區落葉樹種比常綠樹種具有更高的根系C分泌速率。該研究從根際生態學角度豐富了森林樹種差異所驅動的根際過程及其潛在調控機理的認識和理解。 

     以上研究結果近期發表在國際土壤類期刊Plant and Soil2019上。該研究得到了國家重點研發計劃項目、中科院拔尖青年人才項目和國家自然科學基金等項目的資助。 

     原文鏈接 

       

     1 常綠和落葉樹種間根際效應的差異 


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