不同土地利用方式对黑土胶散复合体的影响及与酸度的关系  

Effects of Different Land Uses on Black Soil Colloidal Complex and Its Relationship with Acidity

作　　者：丁慧仪 王淑华[1] 王继红[1] DING Huiyi;WANG Shuhua;WANG Jihong(Jilin Agricultural University,Changchun 130118)

机构地区：[1]吉林农业大学,长春130118

出　　处：《水土保持学报》2020年第5期369-376,共8页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(41877027)。

摘　　要：以吉林省黑土玉米带区域内10对长期定位采样点的2种土地利用方式土壤(耕作黑土和防护林带黑土)为研究对象,采用胶散分组法提取土壤胶散复合体,探究长期不同利用方式对黑土胶散复合体和酸度的影响。结果表明:耕作黑土与防护林带黑土均表现为G 0与G 2组的绝对含量增加,G 1组的绝对含量下降,复合体总量分别下降了3.88%和0.28%。耕作黑土和防护林带黑土pH分别平均下降12.12%和3.77%,有机碳含量在耕作黑土和防护林带黑土中分别平均下降23.17%和9.00%,2种利用方式土壤的胡敏酸、富里酸、交换性钙离子和碳酸钙均出现下降;耕作黑土分别平均下降12.18%,3.53%,16.29%,31.53%;防护林带黑土分别平均下降20.07%,13.14%,2.81%,7.81%。G 1组与pH、HA、Ca^2+和CaCO 3呈极显著正相关,与FA呈显著负相关;G 2组与pH、HA、Ca^2+和CaCO 3呈极显著负相关。pH与HA、Ca^2+和CaCO 3呈极显著正相关,与FA呈显著负相关。经过11年的变化,黑土胶散复合体稳定性下降,相比非耕作状态下黑土,耕作模式下的黑土胶散复合体稳定性下降更为严重,胶散复合体总量下降的更多,酸度下降更为明显。Ca^2+和HA的变化是影响黑土土壤酸化和土壤团聚体稳定性的主要驱动因素。土壤酸化的结果使土壤胶散复合体数量减少,稳定性变差。In order to explore the effects of long-term different land uses on the colloidal complex and acidity of black soil,the soil colloid dispersion complex was extracted by colloid dispersion grouping method based on 10 pairs of long-term soil positioning sampling point(tillage black soil and shelterbelt black soil)in the black soil corn belt of Jilin Province.The results showed that the absolute contents of cultivated black soil and shelterbelt black soil increased in G 0 and G 2 groups,but decreased in G 1 group,and the total amount of complex decreased by 3.88%and 0.28%,respectively.The pH of cultivated black soil and shelterbelt black soil decreased by 12.12%and 3.77%respectively,and the contents of organic carbon in cultivated black soil and shelterbelt black soil decreased by 23.17%and 9.00%respectively.Humic acid,fulvic acid,exchangeable calcium ion and calcium carbonate decreased in the two land uses,and the average decrease in cultivated black soil was 12.18%,3.53%,16.29%and 31.53%,respectively.The black soil of shelterbelt decreased by 20.07%,13.14%,2.81%and 7.81%,respectively.The G 1 group showed extremely significant positive correlations with pH,HA,Ca ^2+and CaCO 3,and significantly negative correlations with FA;while G 2 group had extremely significant negative correlations with pH,HA,Ca ^2+and CaCO 3.Soil pH was significantly positively correlated with HA,Ca ^2+and CaCO 3,and negatively correlated with FA.After 11 years,the stability of black soil colloid-dispersion complex decreased.Compared with non-tillage black soil,the stability of black soil colloid-dispersion complex decreased more seriously.The total amount of colloid-dispersion complex decreased more,and the acidity decreased more obviously than that of non-tillage black soil.The changes of Ca ^2+and HA were the main driving factors affecting soil acidification and the stability of soil aggregates in black soil.As a result of soil acidification,the number of soil colloid-dispersion complex decreased and its stability became worse.

关 键 词：土地利用方式 胶散复合体 胶结物质 酸度 

分 类 号：S513[农业科学—作物学]