【摘要】：依據(jù)新疆綠洲棉花長(zhǎng)期連作的微區(qū)定位試驗(yàn),研究了在秸稈還田和不還田處理下,棉田土壤有機(jī)碳礦化特征,以及土壤有機(jī)碳釋放隨棉花秸稈還田年限的變化規(guī)律。結(jié)果表明:秸稈還田與不還田處理相比增加了0~60 cm土層土壤的總有機(jī)碳(TOC)、可礦化碳(MC)的含量和礦化速率(MR),并且隨著秸稈還田年限的加長(zhǎng)呈上升趨勢(shì),但隨土層的加深而下降。持續(xù)秸稈還田后棉田隨著秸稈還田時(shí)間增加土壤有機(jī)碳礦化速率、累積礦化排放量(CO_2-C排放量)增加,但礦化強(qiáng)度呈降低趨勢(shì),而棉花連作但秸稈不還田的棉田變化趨勢(shì)與之相反。說(shuō)明棉花秸稈還田措施增加了新疆綠洲棉田土壤有機(jī)碳含量,土壤中有機(jī)碳雖然不斷得到補(bǔ)充,但尚未達(dá)到飽和狀態(tài),隨著秸稈還田時(shí)間延長(zhǎng)棉田固碳能力下降。
[Abstract]:Based on the microregional localization experiment of cotton continuous cropping in oasis of Xinjiang for a long time, the mineralization characteristics of soil organic carbon in cotton field and the change of soil organic carbon release with the returning years of cotton straw were studied under straw returning and non-returning treatment. The results showed that the content of total organic carbon (TOC),) mineralizable carbon (MC) and the mineralization rate (MR),) of total organic carbon (TOC),) in the soil layer of 0 ~ 60 cm soil layer were increased compared with the non-return treatment. The content of (MC) and the mineralization rate of the total organic carbon mineralizable carbon (MC) in the soil layer increased with the increase of the number of years of straw returning to the field. After continuous straw returning to the field, the soil organic carbon mineralization rate increased, and the cumulative mineralization discharge (CO_2-C emission) increased, but the mineralization intensity decreased with the straw returning time, and the soil organic carbon mineralization rate increased with the straw returning time, but the mineralization intensity decreased with the increase of soil organic carbon mineralization rate. The change trend of cotton field with continuous cropping but no straw returning to the field was opposite to that of cotton field. The results showed that the measures of returning cotton straw to field increased soil organic carbon content in Xinjiang oasis cotton field. Although soil organic carbon was continuously supplemented, it was not yet saturated, and the carbon sequestration capacity of cotton field decreased with the extension of straw returning time.
【作者單位】： 石河子大學(xué)新疆兵團(tuán)綠洲生態(tài)農(nóng)業(yè)重點(diǎn)實(shí)驗(yàn)室;克拉瑪依市克拉瑪依區(qū)農(nóng)林水牧局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(31260307)資助
【分類號(hào)】：S153.6

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