本文選題：長期施肥　切入點：土壤　出處：《吉林農(nóng)業(yè)大學學報》2017年06期

【摘要】：以長期定位施肥土壤為研究對象,依據(jù)Mehlich法測定土壤黏粒級復合體的表面電荷,分析其表面電荷性質(zhì)的變化。結(jié)果表明:長期單施化肥會導致土壤黏粒級復合體的總負電荷(CEC8.2)下降,且N肥單施或N肥配施的CEC_(8.2)下降幅度較大,說明長期單施或配施N肥的土壤有機質(zhì)含量和pH低,其黏粒級復合體的CEC_(8.2)含量也低。N、K單施或N、K肥配施使永久負電荷(CECP)偏低,配施有機物料的CECP則較高。CM2與CM1組各相同處理間的CECP進行比較,差異不明顯。與單施化肥相比,添加有機物料增加了土壤的有機質(zhì)含量,提高了土壤pH,使可變負電荷(CECV)含量高于單施化肥組,而陰離子交換量(AEC)含量低于單施化肥組。相關分析顯示:土壤CEC_(8.2)與有機質(zhì)和pH均呈顯著正相關,CECV與土壤有機質(zhì)和pH呈極顯著正相關,AEC與土壤有機質(zhì)和pH分別呈顯著和極顯著負相關,凈負電荷量與土壤有機質(zhì)和pH均呈顯著正相關,最大負電荷量與土壤有機質(zhì)和pH均不相關。
[Abstract]:The surface charge of soil clay complex was measured by Mehlich method and the change of surface charge property was analyzed.The results showed that long-term application of chemical fertilizer alone could decrease the total negative charge (CEC8.2) of soil clay grade complex, and the decrease of CEC8. 2) in N fertilizer alone or in combination with N fertilizer was larger, which indicated that the soil organic matter content and pH of soil were low when N fertilizer was applied alone or in combination for a long time.Compared with single fertilizer application, adding organic materials increased soil organic matter content, increased soil pH, made the content of variable negative charge CECVV higher than that of single fertilizer group, and the anion exchange capacity (AEC) content was lower than that of single fertilizer application group.Correlation analysis showed that soil CECJ 8.2) was positively correlated with soil organic matter and pH, and the correlation between CECV and soil organic matter and pH was very significant. AEC was significantly and extremely significantly negatively correlated with soil organic matter and pH, respectively.The net negative charge was positively correlated with soil organic matter and pH, but the maximum negative charge was not correlated with soil organic matter and pH.
【作者單位】： 吉林農(nóng)業(yè)大學資源與環(huán)境學院;吉林省靖宇縣林業(yè)局;陜西省漢中市天然林保護中心;
【基金】：國家自然科學基金項目(41071160) 吉林省科技發(fā)展計劃項目(20126031)
【分類號】：S151.9

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