PJB-2022-374
SUITABLE TEMPERATURE AND LENGTH OF WHEAT STRAW IN SITU SOIL CULTURE PROMOTES SOIL NITROGEN ACCUMULATION AND CHEMICAL COMPOSITION STABILIZATION
Daijing Zhang
Abstract
Straw can be an important source of soil nitrogen. Temperature and straw length are considered to be the key factors affecting straw decomposition. In this study, we used indoor constant temperature incubation method and a two-factor randomized test combined with an orthogonal test; the aim was to investigate the changes in soil nitrogen and chemical composition and their relationship after 100 days of wheat straw in situ soil culture at different temperatures (15°C, 25°C, 35°C) and straw lengths (2 mm, 5 cm, 10 cm). The highest increase of nitrogen in soil was observed at 25°C. The chemical composition of the soil after the addition of exogenous straw was mainly composed of amino acids, benzene, aldehydes, etc. The composition types were significantly reduced compared to the original soil. The highest degree of soil humification was observed at 25°C and 2 mm, the ratio of toluene to benzene was 5.46, which was 190.62% higher than that of the original soil. Meanwhile, the relative content of aromatic compounds increased, which was beneficial to soil stability and promoted the formation of soil organic matter. Cluster analysis showed that toluene and acids were grouped with soil nitrogen and had a greater effect on nitrogen content.
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