• 论文与研究报告 •

### 间伐强度对马尾松人工林根际与非根际土壤中性糖特征的影响

1. 南方现代林业协同创新中心 南京林业大学生物与环境学院 南京 210037
• 收稿日期:2017-11-06 修回日期:2019-05-29 发布日期:2019-09-05
• 基金资助:
长三角城市群关键生态景观重建修复技术与示范（2016YFC0502703）。

### Impacts of Thinning Intensity on Neutral Sugars in Rhizosphere and Bulk Soil of Pinus massoniana Plantation

Ye Yuqian, Zhao Jiahao, Liu Chang, Guan Qingwei

1. Co-Innovation Center of the Sustainable Forestry in Southern China College of Biology and the Environment, Nanjing Forestry University Nanjing 210037
• Received:2017-11-06 Revised:2019-05-29 Published:2019-09-05

Abstract: [Objective] To investigate the content, composition and origin of neutral sugars in rhizosphere and bulk soil under different thinning intensities, aiming at determining the changes of soil organic carbon pool and its stability after thinning.[Method] The experiment was conducted in a 30-years-old Pinus massoniana plantation. Four thinning intensities were performed with a randomized block design. Soil physicochemical properties and the content and composition of neutral sugar in litter and soil were measured to determine their responses to thinning.[Result] The content of neutral sugar in the rhizosphere soil was significantly higher than that in bulk soil, which was 4.55-7.89 mg·g-1 and 2.67-4.18 mg·g-1, respectively. Thinning significantly decreased the content of neutral sugar in the rhizosphere soil by 15.34%, 27.25% and 42.33%, respectively. The content of neutral sugar in the bulk soil was only decreased significantly in HIT. Thinning had no significant effect on the content of monosaccharides in the bulk soil, and its content was in the order of glucose > mannose > galactose > arabinose > xylose > rhamnose > fucose > ribose. The distribution of monosaccharides in the rhizosphere soil was consistent with that in the bulk soil, and its content was decreased with the increase of thinning intensity. Thinning increased (G+M)/(A+X) ratio in the rhizosphere and the bulk soil, and the ratio was greater than 2. The distribution proportion of neutral sugar in SOC in the rhizosphere and the bulk soil ranged from 16.65% to 17.36%, 16.75% to 23.21%, respectively, and the lowest ratio was found in MIT.[Conclusion] Thinning reduced the total amount of neutral sugars in the rhizopshere and the bulk soil, but showed no significant effect on soil monosaccharides content. Soil microbial activity was enhanced after thinning, leading to an increase in the microbial source of soil neutral sugars. The lowest ratio of neutral sugar to SOC was found in MIT, indicating that MIT benefited the stability of soil carbon pool. The thinning intensity of 45% was the better one for mature Pinus massoniana plantations.