Lu Qi-Fei, Ye Xie-Feng, Han Jin, Pan Hao-Dong, Zhang Ming-Jie, Wang Jing, Yang Jia-Hao, Yao Peng-Wei, Li Xue-Li
National Tobacco Cultivation and Physiology and Biochemistry Research Center, College of Tobacco Science, Henan Agricultural University, Zhengzhou 450002, China.
Staff Training College of China National Tobacco Corporation, Zhengzhou 450008, China.
Huan Jing Ke Xue. 2022 Jul 8;43(7):3825-3834. doi: 10.13227/j.hjkx.202109003.
A field experiment was conducted to study the effects of different organic material amendments on soil respiration in a flue-cured tobacco field. Five treatments were set up:no fertilizer (NF), chemical fertilizer (NPK), chemical fertilizer+ryegrass (NPKG), chemical fertilizer+wheat straw (NPKS), and chemical fertilizer+tobacco straw biochar (NPKB). The results showed that:① Compared with that under NPK, NPKG and NPKS decreased the temperature sensitivity () of total soil respiration and heterotrophic respiration, whereas NPKB increased the of heterotrophic respiration. The two-factor fitting model of soil respiration and soil hydrothermal factors accounted for 50%-80% of the variation in soil respiration. ② The addition of organic materials significantly increased the content of soil soluble organic carbon (DOC) and root dry matter. Soil heterotrophic respiration() was significantly positively correlated with DOC content, and soil autotrophic respiration() was significantly parabolically correlated with root biomass, with an of 0.327-0.634. ③ Soil respiration increased first and then decreased during the tobacco growth period. Compared with that under the NF treatment, the NPK treatment significantly promoted soil respiration and its components. Compared with those of the NPK treatment, rates were significantly increased by 20.08%, 10.32%, and 9.88% under the NPKG, NPKS, and NPKB treatments, respectively; rate increased by 24.21%, 16.51%, and 11.68% respectively, and rate was increased by 15.12% in the NPKG treatment. In summary, straw returning and biochar addition significantly increased by increasing soil DOC, thereby promoting . Incorporation of ryegrass not only increased the but also increased by promoting the growth and development of roots and therefore the .
通过田间试验研究了不同有机物料改良对烤烟田土壤呼吸的影响。设置了5个处理：不施肥（NF）、化肥（NPK）、化肥+黑麦草（NPKG）、化肥+小麦秸秆（NPKS）和化肥+烟草秸秆生物炭（NPKB）。结果表明：①与NPK处理相比，NPKG和NPKS降低了土壤总呼吸和异养呼吸的温度敏感性（），而NPKB提高了异养呼吸的温度敏感性。土壤呼吸与土壤水热因子的双因素拟合模型解释了土壤呼吸变异的50%-80%。②添加有机物料显著增加了土壤可溶性有机碳（DOC）含量和根系干物质。土壤异养呼吸（）与DOC含量显著正相关，土壤自养呼吸（）与根系生物量显著呈抛物线相关，相关系数为0.327-0.634。③烟草生育期内土壤呼吸先升高后降低。与NF处理相比，NPK处理显著促进了土壤呼吸及其组分。与NPK处理相比，NPKG、NPKS和NPKB处理的速率分别显著提高了20.08%、10.32%和9.88%；速率分别提高了24.21%、16.51%和11.68%，NPKG处理的速率提高了15.12%。综上所述，秸秆还田和添加生物炭通过增加土壤DOC显著提高了，从而促进了。黑麦草的掺入不仅增加了，还通过促进根系的生长发育从而增加了，进而提高了。
