CAJ | 학술논문

通过分析南疆阿克苏阿瓦提县枣棉间作和单作枣树、单作棉田土壤微生物生物量碳、氮的时空变化及其与土壤理化性质的相关性,研究不同种植模式对土壤微生物性状的影响.结果表明,不同种植模式下微生物生物量碳、氮含量有显著差异.土壤微生物生物量碳含量在17.47~362.47 mg/kg,总体呈现出单作棉田＞枣棉间作4 a＞枣棉间作5 a＞单作枣树5 a 的特点.不同种植模式土壤微生物生物量氮含量在3.63~34.03 mg/kg,依次为枣棉间作4 a＞单作棉田＞枣棉间作5 a＞单作枣树5 a.在枣棉间作系统内微生物生物量碳、氮的分布均呈现出水平和垂直方向的空间变异性,微生物生物量碳、氮在水平方向的最大位点分别位于枣树行冠下区和近冠区0~20 cm土层中.在垂直方向的分布上,微生物生物量碳、氮均在土壤0~20 cm 土层最高,20~40 cm 土层、40~60 cm 土层急剧下降.相关性分析显示,土壤微生物生物量碳、氮与土壤有机碳、全氮、碱解氮、pH 值呈极显著(P ＜0．01)或显著(P ＜0.05)正相关.通径分析表明,土壤有机碳是影响土壤微生物生物量碳、氮重要的直接作用因子.
통과분석남강아극소아와제현조면간작화단작조수、단작면전토양미생물생물량탄、담적시공변화급기여토양이화성질적상관성,연구불동충식모식대토양미생물성상적영향.결과표명,불동충식모식하미생물생물량탄、담함량유현저차이.토양미생물생물량탄함량재17.47~362.47 mg/kg,총체정현출단작면전＞조면간작4 a＞조면간작5 a＞단작조수5 a 적특점.불동충식모식토양미생물생물량담함량재3.63~34.03 mg/kg,의차위조면간작4 a＞단작면전＞조면간작5 a＞단작조수5 a.재조면간작계통내미생물생물량탄、담적분포균정현출수평화수직방향적공간변이성,미생물생물량탄、담재수평방향적최대위점분별위우조수행관하구화근관구0~20 cm토층중.재수직방향적분포상,미생물생물량탄、담균재토양0~20 cm 토층최고,20~40 cm 토층、40~60 cm 토층급극하강.상관성분석현시,토양미생물생물량탄、담여토양유궤탄、전담、감해담、pH 치정겁현저(P ＜0．01)혹현저(P ＜0.05)정상관.통경분석표명,토양유궤탄시영향토양미생물생물량탄、담중요적직접작용인자.
Effects of different planting patterns on soil microbial characters were studied by analyzing the temporal and spatial variation of soil microbial biomass carbon and nitrogen of the jujube-cotton intercrop-ping and monoculture cotton and jujube field,and their correlations with the soil physical and chemical properties in Awati County of Aksu Xinjiang.The results showed that microbial biomass carbon and nitro-gen of different cropping systems had significant differences.The content of microbial biomass carbon changed between 17.47-362.47 mg/kg,and showed that cotton monoculture>jujube-cotton intercropping 4 a>jujube-cotton intercropping 5 a>jujube monoculture 5 a.The content of soil microbial biomass nitro-gen of different planting patterns were in 3.63 -34.03 mg/kg,and the others were sequenced as follows:“jujube-cotton intercropping 4 a>cot-ton monoculture>jujube-cotton intercropping 5 a>jujube monocul-ture 5 a”.The distribution of microbial biomass carbon and nitrogen exhibited the spacial variability of horizontal and vertical in the jujube-cotton intercropping system,and the largest sites of microbial biomass carbon and nitrogen in the horizontal direction were respectively located in the layers of L1 (0-20 cm)in the crown area and near of jujube row.In the vertical directions,microbial biomass carbon and nitrogen were highest in the L1,while declined sharply in the L2 (20-40 cm)and L3 (40-60 cm).Correlation analysis showed that soil microbial biomass carbon and nitrogen were the positive correlations of extremely significant or significant with soil organic carbon,total nitrogen,hydrolyzable nitrogen and pH.Path analysis indicated that soil organic carbon was the important factor affecting microbial biomass carbon and nitrogen in soil.