人工防护林对风沙土有机碳动力学的影响  

Effects of Artificial Shelter Forest on Dynamic Change of Organic Carbon Pool of Aeolian Sandy Soil

作　　者：王迎菊[1,2] 靳正忠[1] 雷加强[1] 王永东[1] 付庆龙[2,3] 

机构地区：[1]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [2]中国科学院大学,北京100039 [3]中国科学院南京土壤研究所,江苏南京210008

出　　处：《干旱区研究》2017年第3期495-503,共9页Arid Zone Research

基　　金：国家自然科学基金项目(41571498)资助

摘　　要：选取塔里木沙漠公路沿线定植年限为5、7、10、13、16 a的防护林,运用物理化学提取法及傅里叶变换红外光谱仪,研究人工防护林对风沙土发育过程中土壤有机碳动力学的影响。结果表明:(1)随定植年限增加,土壤碳储量变化不大;(2)土壤有机碳在0~50 cm随深度增加而降低,50 cm以下变化不大;(3)随防护林定植年限的增加,表层土壤(0~10 cm)中总有机碳(TOC)、微团聚体有机碳(OCMIA)、腐殖质有机碳(OCHS)、抗氧化性(OCNa Cl O)和抗酸解性有机碳(OCHCl)均有所升高,其中TOC、OCMIA、OCHS逐年增加,而OCNa Cl O和OCHCl在5~7 a时增加较快,以后趋于稳定,且各碳组分(OCHCl除外)在不同定植年限防护林风沙土间的差异极显著(P<0.01),OCHCl差异显著(0.01<P<0.05);(4)所有碳组分极显著相关,其中OCMIA、OCHS与TOC的相关性比OCHCl、OCNa Cl O高;(5)惰性碳库中OCMIA和OCNa Cl O占总有机碳的比例较高,OCHS相对含量随定植年限增加而升高;(6)腐殖质结构中C=O相对含量(C=O/C-O-C)先降低后升高,脂族链聚亚甲基碳含量占末端甲基碳的比例(CH2/CH3)7 a时最高,后3个年限变化不大。因此,人工防护林引起了土壤有机碳累积,特别是惰性碳库在表层累积,腐殖化程度增加,提高了土壤固碳能力并促进了风沙土的发育。This study investigated the dynamic change of organic carbon pool of aerolian sandy soil in the sheher belts planted for 5,7,10,13 and 16 years respectively along the Taklimakan Desert Highway. The results are as fol- lows ： （1） The total organic carbon content was changed slightly with the increase of plantation years ; （2） The soil or- ganic carbon content was decreased only in soil layer of 0 -50 cm in depth, and changed slightly in soil layer dee- per than 50 cm; （3） The change of topsoil （0 - 10 cm） showed that the contents of total soil organic carbon （TOC） ,micro-aggregate organic carbon （ OCMIA ） , humus organic carbon （ OCHs ）, resistance to oxidation carbon （ OCNaco ） and resistance to hydrolysis carbon （ OCHcl ） were increased with the increase of plantation years, TOC, OCMIA and OC.s were increased year by year, and OCNaclo and OCHcl were increased after the plantation for 5 to 7 years. Except OCHcI ,all other carbon fractions were changed with the increase of plantation years （P 〈0.01 ） ,and OCscI was changed with significant difference （0.01 〈 P 〈 0.05 ） ; （4） There were the significant correlations among all kinds of SOC fractions,in which the correlations between OCM1A and TOC, and OCHs and TOC were higher than those between OCHcl and TOC, and OCNaclo and TOC ; （5） The proportions of content of OCMIA and OCNclo were high- er than those of OCns and OC.c, and the relative content of OCHs was increased with the increase of plantation years ; （6） The relative content of functional C = O groups （ C = O/C-O-C ） was decreased at first and then in- creased, and the ratio of polymerization methylene in carbon branched chain to methyl at the end of the carbon chain （ CH2/CH3 ） was the highest in the 7-year-old shelter forest. This indicated that the soil organic carbon accumula- tion occurred in the artificial shelter forest, especially the inert carbon pool accumulation in topsoil, and the humufi- cation degree was increased. Thus the

关 键 词：人工防护林 风沙土 植被定植 腐殖质 惰性碳 碳动态 

分 类 号：S718.5[农业科学—林学]