發(fā)布時間：2018-04-21 01:08

  本文選題：肥力 + 玉米秸稈和根茬��； 參考：《土壤學報》2016年04期

【摘要】：外源新碳加入土壤后,傳統(tǒng)技術(shù)尚無法區(qū)分其與原土壤有機碳的不同。利用13C穩(wěn)定同位素方法,通過室內(nèi)培養(yǎng)實驗,探討玉米秸稈和根茬添加到不同肥力水平土壤后外源新碳在土壤中分配與固定的差異。結(jié)果表明:(1)低肥土壤添加葉28 d后土壤有機碳(SOC)含量高于添加根和莖的;高肥土壤添加葉在整個培養(yǎng)期間(1~180 d)SOC含量都高于添加根和莖;兩種肥力水平土壤在添加玉米根、莖、葉180 d后SOC含量均接近相等。(2)玉米根、莖、葉的添加對SOC中外源新碳含量以及殘體殘留率的影響不同,28 d前低肥土壤外源新碳含量高于高肥土壤,28 d后結(jié)果與之相反;低肥土壤在培養(yǎng)28 d后添加根的殘留率比添加莖和葉的低,高肥土壤在培養(yǎng)7 d后添加葉的殘留率比添加根和莖的低。以上結(jié)果表明,外源新碳在土壤中的固定受其來源和土壤肥力水平的影響與制約。
[Abstract]:After exogenous carbon was added to the soil, the traditional technology could not distinguish it from the original soil organic carbon. By using 13C stable isotope method, the difference of the distribution and fixation of exogenous new carbon in soil was studied after corn straw and root stubble were added to different fertility level soil. The results showed that the content of soil organic carbon (SOC) in low fertilizer soil was higher than that in root and stem after 28 days of adding leaves, the content of added leaf in high fertilizer soil was higher than that in root and stem during the whole culture period, the content of maize root and stem was increased in two kinds of soil fertility levels. After 180 days, the content of SOC was close to equal. 2) the effect of the addition of stem and leaf on the content of new carbon in SOC and the residual rate of residual body was different. Before 28 days, the content of exogenous new carbon in low fertilizer soil was higher than that in high fertilizer soil. After 28 days, the results were opposite. The residual rate of root addition in low-fertilizer soil was lower than that in stem and leaf after 28 days culture, and the residual rate of adding leaf in high-fertilizer soil was lower than that in root and stem after 7 days cultivation. The results indicated that the fixation of exogenous new carbon in soil was influenced and restricted by its source and soil fertility level.
【作者單位】： 沈陽農(nóng)業(yè)大學土地與環(huán)境學院土壤肥力研究室;
【基金】：國家自然科學基金項目(31330011,41171237) 國家公益性行業(yè)(農(nóng)業(yè))科研專項(201303126)資助~~
【分類號】：S158

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