【摘要】：[目的]探討添加不同比例外源有機(jī)物與溫度對(duì)森林土壤有機(jī)碳礦化的影響,以期進(jìn)一步認(rèn)識(shí)二者與土壤有機(jī)碳的生態(tài)聯(lián)系。[方法]將涼水國家級(jí)自然保護(hù)區(qū)紅松闊葉混交林試驗(yàn)樣地內(nèi)收集的紅松枯葉、椴樹和楓樺枯葉(闊葉枯葉)作為外源有機(jī)物,通過實(shí)驗(yàn)室培養(yǎng)法,在恒溫箱內(nèi)模擬了紅松枯葉和不同添加比例的闊葉枯葉在不同培養(yǎng)溫度(25、30、35℃)和培養(yǎng)時(shí)間(5、10、20、35、60、90 d)的礦化過程,利用堿液吸收法測定了不同處理土壤CO_2的釋放量,計(jì)算了其有機(jī)碳礦化速率和累積礦化量,分析了其對(duì)土壤有機(jī)碳的激發(fā)效應(yīng)。[結(jié)果]培養(yǎng)溫度為25、35℃時(shí),混合添加闊葉枯葉的激發(fā)效應(yīng)優(yōu)于紅松枯葉的激發(fā)效應(yīng)。培養(yǎng)溫度為30℃時(shí),添加紅松枯葉的激發(fā)效應(yīng)優(yōu)于闊葉枯葉的激發(fā)效應(yīng)。3個(gè)培養(yǎng)溫度下,添加枯葉對(duì)土壤礦化過程具有顯著的促進(jìn)作用(P0.05)。培養(yǎng)溫度為30℃時(shí),添加外源有機(jī)物對(duì)土壤有機(jī)碳的激發(fā)效應(yīng)最優(yōu)。[結(jié)論]紅松闊葉混交林土壤有機(jī)碳的激發(fā)效應(yīng)受添加外源有機(jī)物的種類、培養(yǎng)溫度以及培養(yǎng)時(shí)間等許多因素的影響。
[Abstract]:[objective] to explore the effects of different proportion of exogenous organic matter and temperature on the mineralization of organic carbon in forest soil, so as to further understand the ecological relationship between them and soil organic carbon. [methods] the dead leaves of Pinus koraiensis, Linden and Betula platyphylla (broad-leaf withered leaves) collected from the experimental plots of Pinus koraiensis broad-leaf mixed forest in Liangshui National Nature Reserve were used as exogenous organic compounds. The mineralization process of dead leaves and broad-leaf withered leaves of Pinus koraiensis at different culture temperatures (25, 30, 35 鈩，

本文編號(hào)：2501336