带状套作模式中土壤有机质和全氮的空间分布规律——以玉米大豆为例.

【Objective】 The experiment was conducted to study the effect of different planting patterns arrangements of maize and soybean intercropping on spatial distribution of soil total nitrogen and organic matter contents, in order to provide reference for optimal management and fertilizer utilization and better crop yield at lower fertilizer cost.【Method】 The soil samples of continuous maize/soybean relay strip intercropping (MS1), maize/soybean relay strip intercropping in rotations (MS2), Traditional maize/soybean intercropping (MS3), sole maize (M), sole soybean (S), and fallow land (FL) were used as tests from 2018 to 2020 to analyze the differences of soil organic matter and total nitrogen contents under different planting patterns.【Result】 The highest content of soil organic matter (29.19 g/kg) and total nitrogen (10.19 g/kg) were detected under MS2. The minimum content of organic matter (1.69 g/kg) and total nitrogen (0.64 g/kg) were under FL. Soil total nitrogen in soybean row was higher than that in maize row, and organic matter content was significantly different under different planting patterns (P<0.05). Compared with other planting patterns, soil organic matter changed greatly under MS2 planting patterns, and the spatial distribution was the most dense. The variation coefficient of soil organic matter content was used to classify the soil. It was found that the variation of MS1, MS2, MS3, M and S was moderate, the variation of FL was weak, and the variation of MS2 was the largest. The spatial distribution density of total nitrogen in maize row was lower than that in soybean row, but the maximum and minimum values of total nitrogen and organic matter had the same distribution pattern. The moderate variation of soil total nitrogen was MS1, MS2, MS3, M, and S, the weak variation was FL, and the maximum variation was MS2. At the same time, the correlation analysis of soil nitrogen and organic mass variability showed that there was a high correlation between soil organic matter and soil total nitrogen, indicating that the change rule of total nitrogen and organic matter was consistent, and soil organic matter and total nitrogen content showed a significant positive correlation under different planting patterns. 【Conclusion】 There were significant variations for soil organic matter and total nitrogen under different planting patterns of maize and soybean in intercropping. MS2 was a better planting pattern for strip relay intercropping, it could increase spatial distribution of soil organic matter and total nitrogen unit content, and improve the soil fertility and carbon to nitogen ratio. [ABSTRACT FROM AUTHOR]