沙质农田玉米生产力的形成与土壤环境关系的研究

结果表明:(1)在科尔沁沙地,五种主要类型农田生长季平均土壤含水量是粘壤土水浇地(ICL,12.4%) > 沙壤土水浇地(ISL,9.5%) > 粘壤土旱坡地(CLDSL,8.87%) > 粘壤土旱平地(CLDL,6.55%) > 沙壤土旱平地(SLDL,5.70%),地温是SLDL(22.04℃) > CLDL(21.73℃) > CLDSL(21.40℃) > ISL(21.08℃) > ICL(21.05℃),土壤养分综合指数高低的顺序是ICL(90.8) > ISL(83.8) > CLDL(75.8) > CLDSL(55.0) > SLDL(36.8);(2)五种类型农田玉米植株高(cm)和生物量(kg·m^-2)都是ISL(270,2.96) > ICL(245,2.70) > CLDSL(225,2.12) > CLDL(220,1.86) > SLDL(181,1.32);(3)玉米地上生物量与土壤速效N、P、K的相关系数为0.860,与土壤水分的相关系数为0.837,与土壤有机质含量的相关系数为0.753,而与地温的相关系数为-0.976。

Relation between Productivity Formation of Corn and Soil Environment in Sandy Farmland

Average soil water content during the growth period of corn in the 5 main typical croplands in Horqin Sandy Land follows order: irrigated clay loam (ICL, 12.4%) > irrigated sandy loam (ISL, 9.50%) > clay loam dry slop land (CLDSL, 8.87%) > clay loam dry land (CLDL, 6.55%) > sandy loam dry land (SLDL, 5.70%); Average soil temperature follows order: SLDL(22.04℃) > CLDL(21.73℃) > CLDSL(21.40℃) > ISL(21.08℃) > ICL(21.05℃); Comprehensive index of soil nutrient follows order: ICL(90.8) > ISL(83.8) > CLDL(75.8) > CLDSL(55.0) > SLDL(36.8). (2) Both height (cm) and biomass (kg·m^-2) of corn were ISL(270, 2.96) > ICL(245, 2.70) > CLDSL(225, 2.12) > CLDL(220, 1.86) > SLDL(181, 1.32). (3) Correlation coefficients between the biomass and soil indexes follow order: quick acting N、P、K(R=0.860) > soil moisture (R=0.837) > soil organic matter (R=0.753) > soil temperature (R=-0.976)