本文選題：寧南退耕區(qū) + 土壤有機碳　； 參考：《浙江農(nóng)業(yè)學(xué)報》2017年03期

【摘要】：以寧南退耕區(qū)采取的5種主要退耕模式——純山杏林、山杏+檸條林、山杏+山桃+檸條林、沙棘林和苜蓿人工草地為研究對象,以撂荒地為對照,探討不同退耕模式對土壤有機碳固存的影響。結(jié)果表明:在100 cm土層內(nèi)5種退耕模式和撂荒對照的土壤有機碳儲量基本上呈現(xiàn)出隨土層深度加深而遞減的趨勢,其中淺層(0~20 cm)是土壤有機碳固存的聚集層,且極顯著高于其他層的土壤有機碳累積;100 cm土層累積的總碳量表現(xiàn)為山杏+檸條林山杏林沙棘林山杏+山桃+檸條林撂荒地苜蓿人工草地。從有機碳蓄積來看,在寧南山區(qū)采用單一的喬灌混交、喬木林或灌木林的退耕模式較采用人工草地或自然恢復(fù)的模式更有利于土壤有機碳的累積。
[Abstract]:In this paper, five main types of conversion models, pure apricot forest, Caragana korshinskii forest, Caragana korshinskii forest, Hippophae rhamnoides forest and alfalfa artificial grassland, were used as the research objects, and the abandoned land was used as the control. The effects of different models of returning farmland on soil organic carbon sequestration were studied. The results showed that in 100 cm soil layer, the soil organic carbon (SOC) reserves of five models of returning to farmland and abandoned control showed a decreasing trend with the depth of soil layer deepening, among which the shallow layer of 20 cm was the accumulation layer of soil organic carbon sequestration. The soil organic carbon accumulation in 100 cm soil layer was significantly higher than that in other layers. The total carbon accumulation in 100 cm soil layer was as follows: alfalfa artificial grassland in apricot Caragana forest, Hippophae rhamnoides forest, Caragana korshinskii forest and abandoned alfalfa field. From the perspective of organic carbon accumulation, using a single Arbor and Irrigation mixed in the mountain area of southern Ningxia, the conversion model of Arbor forest or shrub is more favorable to the accumulation of soil organic carbon than that of artificial grassland or natural restoration.
【作者單位】： 寧夏農(nóng)林科學(xué)院荒漠化治理研究所;寧夏防沙治沙與水土保持重點實驗室;寧夏生態(tài)修復(fù)與多功能林業(yè)綜合研究中心;
【基金】：“十二五”國家科技支撐項目(2015BAC01B01) 自治區(qū)一二三產(chǎn)業(yè)融合項目(寧夏多功能林業(yè)分區(qū)域研究與示范) 寧夏自然科學(xué)基金項目(NZ16095,NZ16106,NZ15121) 寧夏農(nóng)林科學(xué)院科技創(chuàng)新先導(dǎo)資金項目(NKYJ-15-18,NKYJ-15-19)
【分類號】：S153.6

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