12/5/2023 0 Comments Microcosm biology![]() ![]() Root- and microbial-derived mucilages affect soil structure and water transport. Carbon and nitrogen recycling from microbial necromass to cope with C:N stoichiometric imbalance by priming. The microbial efficiency matrix stabilization (MEMS) framework integrates plant litter decomposition with soil organic matter stabilization: do labile plant inputs form stable soil organic matter? Global Change Biology 19, 988–995.Ĭui, J., Zhu, Z., Xu, X., Liu, S., Jones, D.L., Kuzyakov, Y., Shibistova, O., Wu, J., Ge, T., 2020. Tillage and residue management effects on soil aggregation, organic carbon dynamics and yield attribute in rice-wheat cropping system under reclaimed sodic soil. Atmospheric CO 2 enrichment and drought stress modify root exudation of barley. Soil Science Society of America Journal 76, 994–1004.Ĭalvo, O.C., Franzaring, J., Schmid, I., Müller, M., Brohon, N., Fangmeier, A., 2017. Rice rotation and tillage effects on soil aggregation and aggregate carbon and nitrogen dynamics. ![]() Is the rate of mineralization of soil organic carbon under microbiological control? Soil Biology & Biochemistry 112, 127–139.īrye, K.R., Olk, D.C., Schmid, B.T., 2012. NH 4 + toxicity in higher plants: a critical review. Effects of soil nitrogen availability on rhizodeposition in plants: a review. Environmental Monitoring and Assessment 185, 8659–8671.īowsher, A.W., Evans, S., Tiemann, L.K., Friesen, M.L., 2018. Influence of elevated carbon dioxide and temperature on below-ground carbon allocation and enzyme activities in tropical flooded soil planted with rice. Impact of root exudates ofdifferent cultivars and plant development stages of rice ( Oryza sativa L.) on methane production in a paddy soil. Biology and Fertility of Soils 53, 407–417.Īulakh, M.S., Wassmann, R., Bueno, C., Rennenberg, H., 2001. Rice rhizodeposition and carbon stabilisation in paddy soil are regulated via drying-rewetting cycles and nitrogen fertilisation. Short and long-term effects of elevated CO 2 on Lolium perenne rhizodeposition and its consequences on soil organic matter turnover and plant N yield. Elevated CO 2 and N fertilizer applied in rice growing season had a legacy effect on subsequent mineralization and retention of rhizodeposits in paddy soils after harvest, the extent of which varied among the soil aggregates.Īllard, V., Robin, C., Newton, P.C.D., Lieffering, M., Soussana, J.F., 2006. These results were relatively weak in the silt-clay fraction. ![]() It also resulted in up to 23% less rhizodeposit-C incorporated into the microbial biomass of the three soil aggregates, and up to 23% more incorporated into soil organic carbon. Elevated CO 2 increased the rhizodeposit- 13C content of all aggregate fractions by 10%–80%, while it reduced cumulative 13CO 2 emission and the bioavailable C pool size of rhizodeposit-C, especially in N-fertilized soil, except for the silt-clay fraction. During the incubation of microaggregates separated from N-fertilized soils, 3%–9% and 9%–16% more proportion of rhizodeposit- 3C was mineralized to 13CO 2, and incorporated into the microbial biomass, respectively, while less was allocated to soil organic carbon than in the non-fertilized soils. The initial rhizodeposit- 13C content of N-fertilized microaggregates was less than 65% of that of non-fertilized microaggregates. After harvest, soil with labeled rhizodeposits was collected, separated into three aggregate size fractions, and flood-incubated for 100 d. Rice ( Oryza sativa L.) was labeled with 13CO 2 under ambient (400 ppm) and elevated (800 ppm) CO 2 concentrations with and without N fertilization. This study explored the effects of elevated CO 2 and N fertilization during the rice growing season on the subsequent mineralization and retention of rhizodeposit-C in soil aggregates after harvest. Rhizodeposits in rice paddy soil are important in global C sequestration and cycling. ![]()
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