Li Jing, Zhang Lili, Yu Shikui, Luo Zongzhi, Su Dewei, Zheng Dan, Zhou Hengyu, Zhu Jieyi, Lin Xingsheng, Luo Hailing, Rensing Christopher, Lin Zhanxi, Lin Dongmei
National Engineering Research Center of Juncao Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
College of Juncao and Ecology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Plants (Basel). 2024 Mar 1;13(5):708. doi: 10.3390/plants13050708.
Long-term plant residue retention can effectively replenish soil quality and fertility. In this study, we collected rhizosphere soil from the residual roots of annual in the Ulan Buh Desert over the past 10 years. The area, depth, and length of these roots decreased over time. The cellulose content of the residual roots was significantly higher in the later 5 years (2018-2022) than the former 5 years (2013-2017), reaching its highest value in 2021. The lignin content of the residual roots did not differ across samples except in 2015 and reached its highest level in 2021. The total sugar of the residual roots in 2022 was 227.88 ± 30.69 mg·g, which was significantly higher than that in other years. Compared to the original sandy soil, the soil organic matter and soil microbial biomass carbon (SMBC) contents were 2.17-2.41 times and 31.52-35.58% higher in the later 3 years (2020-2022) and reached the highest values in 2020. The residual roots also significantly enhanced the soil carbon stocks from 2018-2022. Soil dehydrogenase, nitrogenase, and N-acetyl-β-D-glucosidase (S-NAG) were significantly affected from 2019-2022. The rhizosphere soil community richness and diversity of the bacterial and fungal communities significantly decreased with the duration of the residual roots in the sandy soil, and there was a significant difference for 10 years. , and were the representative bacteria in the residual root rhizosphere soil, while were the enriched fungal genera. The distance-based redundancy analysis and partial least square path model results showed that the duration of residual roots in the sandy soil, S-NAG, and SMBC were the primary environmental characteristics that shaped the microbial community. These insights provide new ideas on how to foster the exploration of the use of annual herbaceous plants for sandy soil improvement in the future.
长期保留植物残体能够有效改善土壤质量和肥力。在本研究中，我们采集了乌兰布和沙漠过去10年一年生植物残根的根际土壤。这些根的面积、深度和长度随时间减少。残根的纤维素含量在后期5年（2018 - 2022年）显著高于前5年（2013 - 2017年），在2021年达到最高值。残根的木质素含量除2015年外各样本间无差异，并在2021年达到最高水平。2022年残根的总糖含量为227.88 ± 30.69 mg·g，显著高于其他年份。与原始沙地土壤相比，后期3年（2020 - 2022年）土壤有机质和土壤微生物生物量碳（SMBC）含量分别高出2.17 - 2.41倍和31.52 - 35.58%，并在2020年达到最高值。残根在2018 - 2022年也显著增加了土壤碳储量。2019 - 2022年土壤脱氢酶、固氮酶和N - 乙酰 - β - D - 葡萄糖苷酶（S - NAG）受到显著影响。随着沙质土壤中残根存在时间的延长，根际土壤细菌和真菌群落的丰富度和多样性显著降低，10年间存在显著差异。 、 和 是残根根际土壤中的代表性细菌，而 是富集的真菌属。基于距离的冗余分析和偏最小二乘路径模型结果表明，沙质土壤中残根的存在时间、S - NAG和SMBC是塑造微生物群落的主要环境特征。这些见解为未来如何促进利用一年生草本植物改良沙地土壤的探索提供了新思路。
