不同肥力棕壤全氮和微生物量氮對外源玉米殘體氮的響應
[Abstract]:Two kinds of soil fertility were studied in brown soil long-term continuous cropping experiment (27a). Maize plants labeled with ~ (15) N were used as experimental materials, maize roots and stems were added to the two soils, respectively. Leaf (8 treatments) were treated with simulated culture and ~ (15) N isotope tracer technique in order to find out the changes of soil total nitrogen content and microbial biomass nitrogen in different fertility soils after adding maize roots, stems and leaves. The results showed that: (1) the total nitrogen content of low fertility brown soil increased by 5.754.77% and 3.75%, respectively, and the contribution rate of exogenous new nitrogen was 3.54% higher than that of high-fertility brown soil, respectively. 3.28% and 2.49%, indicating that the response of different fertility soils to maize residue was different, and the response of low fertility brown soil to exogenous new nitrogen was more sensitive. (2) the microbial biomass nitrogen increased 0.83-0.98 times in low-fertility brown soil and 0.87-1.56 times in high-fertility brown soil. It can be seen that the accumulation of soil microbial biomass nitrogen can be significantly promoted by adding maize plants in different parts, which indicates that exogenous organic matter input is an important factor to stimulate the quantity and activity of soil microorganisms. And the stimulative effect in high fertility soil is more obvious. In addition, microbial biomass nitrogen was significantly higher in high fertility soils than in root addition treatments, but there was no significant difference between root, stem and leaf supplementation treatments in low fertility soils. The contribution of exogenous organic nitrogen input to the soil nitrogen pool is closely related to the soil fertility level and the material composition characteristics of different residues.
【作者單位】: 沈陽農業(yè)大學土地與環(huán)境學院土肥資源高效利用國家工程實驗室和農業(yè)部東北耕地保育重點實驗室;
【基金】:國家自然基金項目(31330011,41671293) 國家重點研發(fā)計劃項目(2016YFD0200304)
【分類號】:S158;S513
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