Effects of Exogenous Glucose on Soil Organic Carbon Sequestration and Carbon Metabolism in Root of Malus baccata (L.) Bork
Effects of Exogenous Glucose on Soil Organic Carbon Sequestration and Carbon Metabolism in Root of Malus baccata (L.) Bork
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DOI：
10.1080/00103624.2022.2094396
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发表时间：
2022-07
影响因子：
1.8
通讯作者：
D. Lang;D. Lyu;Jiali He;Z. Zhu;S. Qin
中科院分区：
文献类型：
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作者：
D. Lang;D. Lyu;Jiali He;Z. Zhu;S. Qin
土壤活性碳输入影响土壤有机碳动态和植物组织能量代谢途径。然而，针对果园土壤的研究仍然很少。本研究以13 C-葡萄糖为碳源，研究了有机碳组分中13 C-葡萄糖的去向和苹果根系的碳代谢。博克在两个水平，1.50 g kg−1（GLC 1）和7.50 g kg−1（GLC 2）的外源性葡萄糖的反应进行了评价。葡萄糖的添加增加了土壤有机碳（SOC）、微生物量碳（MBC）、溶解有机碳（DOC）和颗粒有机碳（POC）的δ 13 C值和活性组分含量。试验结束时，GLC 1的MBC、DOC和POC含量分别比GLC 2高3.20%、14.26%和5.16%。此外，这两种血糖速率之间的SOC含量无显著差异。培养结束时，葡萄糖-C主要分配到SOC（56.79-85.05%），其次是DOC（4.72-20.88%）和MBC（4.46-18.1%），最低的是POC（3.86-5.77%）。外源葡萄糖提高了根中有机酸含量和与碳代谢相关的关键酶活性。浆果。此外，根中能量物质三磷酸腺苷的含量，GLC 1比GLC 2高22.35%。相关分析表明，土壤有机碳组分与苜蓿根系碳代谢参数呈显著正相关。浆果。总体而言，葡萄糖的添加改善了碳在根系中的代谢和葡萄糖来源的碳在土壤中的分配。
ABSTRACT Labile carbon (C) inputs to soil affect organic C dynamics in soil and the pathway of energy metabolism in tissue of plants. However, studies focusing on orchard soil are still scarce. In this study, the fate of 13C-glucose in organic C components, and the C metabolism in root of Malus baccata (L.) Borkh. in response to exogenous glucose at two levels, 1.50 g kg−1 (GLC1) and 7.50 g kg−1 (GLC2), were evaluated. Glucose addition increased the δ13C values and contents of soil organic carbon (SOC) and active fractions including microbial biomass carbon (MBC), dissolved organic carbon (DOC) pools, and particulate organic carbon (POC). At the end of the experiment, the MBC, DOC, and POC contents in GLC1 were 3.20%, 14.26%, and 5.16% higher than those in GLC2, respectively. In addition, no marked difference was found for SOC content between these two glucose rates. At the end of incubation, glucose-C was mostly allocated to SOC (56.79–85.05%), followed by DOC (4.72–20.88%) and MBC (4.46–18.1%); the lowest percentage was in POC (3.86–5.77%). Exogenous glucose increased the contents of organic acids and activities of key enzymes related with C metabolism in roots of M. baccata. In addition, adenosine triphosphate content, the energy matter, in root under GLC1 was 22.35% higher than that under GLC2. Correlation analyses suggested that the soil organic C fractions were positively correlated with C metabolism parameters in the roots of M. baccata. Overall, glucose addition improved the C metabolism in roots and the allocation of glucose-derived C in soil.