丹江口庫區(qū)覆膜耕作土壤凈氮礦化隨夏玉米生長期的變化
[Abstract]:Net nitrogen mineralization in farmland has an important effect on soil nitrogen loss and agricultural non-point source pollution. Taking yellow brown soil of summer maize in Wulongchi small watershed of Danjiangkou reservoir area as an example, the in situ mineralization experiment was carried out. The changes of net nitrogen mineralization in summer maize during the growth period of summer maize under film mulching were studied by comparing with the soil without mulching film tillage. The results showed that during the whole growth period of summer maize, the net ammoniation, nitrification and mineralization of mulching tillage soil were significantly higher than that of non-mulching soil, which were 6.63 ~ (12. 96) and 19.59mg kg~ (-1), respectively. The net ammoniation rate of mulching tillage soil was higher at seedling stage, lowest at heading stage, and increased to the highest at maturity stage, while the rate of net nitrification and net nitrogen mineralization was higher at seedling stage and lowest at jointing stage. The process of rising to the highest at maturity; There was a significant linear relationship between net nitrogen mineralization rate and soil total nitrogen and NO_3~--N content and soil water content. Film mulching can effectively regulate soil hydrothermal conditions and promote soil net nitrogen mineralization.
【作者單位】: 湖北大學(xué)資源環(huán)境學(xué)院/區(qū)域開發(fā)與環(huán)境響應(yīng)湖北省重點實驗室;
【基金】:國家自然科學(xué)基金項目(41471227)資助~~
【分類號】:S513;S153
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