摘要
为了进一步深入系统研究松辽平原玉米带黑土耕作区高产田(平面型)土壤质量的管理与评价提供理论支持和借鉴,并且对黑土资源的利用与保护、为粮食的丰产增收在土壤结构理论方面具有重要的现实意义,并且对黑土资源的利用与保护、为粮食的丰产增收在土壤结构理论方面的探索,以松辽平原玉米带耕作区高产田(平面型)与低产田(波浪型)0～20cm耕层土壤为研究对象采用田间季节性冻融过程与室内模拟冻融试验相结合的方法,研究松辽平原玉米带高产田土壤的结构性对冻结的响应,包括影响范围较深和程度,进一步阐明高产田土壤对冻结的响应机理。采用高产田与低产田对比的方法,在不同的冻结条件下,设置含水量接近5%、10%、15%、20%、25%;设置冻结频率0、2、4、6次进行室内模拟冻结实验。通过对容重、孔隙度、孔隙面积、Feret直径等指标的测定与分析,研究了不同冻结频率不同含水量,对高产田和低产田0～20cm耕层的土壤孔隙特征的影响。结果显示:冻融循环能够显著增加松辽平原玉米带高产田与低产田0～20cm耕层土壤孔隙的数目,高产田增加百分比为32.58%;低产田增加百分比为17.95%。显著降低了低产田0～20cm土层范围内Feret直径和土壤的平均孔隙面积以,Feret直径由冻结前的2.31mm降低到冻结后的1.92mm,降低百分比为16.88%,低产田土壤的平均孔隙面积由冻结前的8.91mm2降低到冻结后的4.65mm,降低百分率为47.81%(P<0.05)。除了土壤孔隙的成圆率外,冻融循环对高产田与低产田不同径级团聚体的孔隙数目、平均孔隙面积、平均Feret直径均有不同影响程度的差异(P<0.05)。高产田>5mm团聚体平均孔隙面积由冻结前的37.08mm2降低到冻结后的23.84mm,降低百分比为38.40%,变化差异显著(P<0.05),这是高产田与低产田相比特有的变化规律。而高产田其他粒级团聚体和低产田所有粒级�
In order to further system further in-depth system of Songliao Plain corn with black soil farming area high-yield cropland of soil quality management and evaluation to provide theoretical support and learn from , and the black soil resources utilization and protection, as grain yield income soil structure theory has important practical significance, and the black soil resources utilization and protection, for grain yield income in the exploration of the theoretical aspects of soil structure, the high-yield cropland of the low-yield cropland and comparative method, under freezing conditions, through the analysis of bulk density, porosity, aggregate distribution and stability, compared to three index determination and analysis of different frequencies, different water content of frozen, the high yield cropland and cropland of the low yield in 0-20 cm soil structure characteristics, the different water 5%, 10%, 15%, 20%, 25% and different freezing frequency 0, 2, 4, 6, the results showed： the different water content after freezing and thawing soil pore space characteristics changed with significant influence. The freeze-thaw cycle could significantly increase the number of Songliao Plain Corn Belt yield cropland and low-yield cropland of 0-20 cm top soil porosity, high-yield cropland to increase the percentage of 32.58. The percentage of 17.95 increased in low-yield cropland. Significantly reduced the average pore size of Feret-diameter in the range of 0-20 cm soil layer of low-yield cropland and soil Feret-diameter by 2.31 mm before freezing to frozen 1.92 mm percentage reduction of 16.88, average pore size of the low-yield farmland soil freeze before the 8.91 mm2 mm lower to 4.65 mm2 of the frozen, reducing the percentage of 47.81 （p〈0.05）. In addition to the rate of the soil pores into round aggregates in pore number of freeze-thaw cycle on the high-yield cropland and low-yield cropland of all classes, with an average pore size, the average Feret-diameter had different impact on the degree of difference �
出处
《中国农学通报》
CSCD
2012年第24期80-85,共6页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金"松辽平原玉米带高产土壤的肥力特征及形成机理研究"(31071862)
关键词
黑土
土壤孔性
冻结
高产田
black soil
soil porosity
alternate freezing and thawing
high-yield cropland
