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

doi:10.11707/j.1001-7488.20190804

摘要/Abstract

摘要： [目的]探讨不同间伐强度下马尾松人工林根际与非根际土壤中性糖为含量、组成和来源，以更好了解间伐后林地土壤有机碳库及其稳定性变化，为马尾松人工林可持续经营提供科学指导。[方法]以30年生马尾松人工林为研究对象，采用随机区组法，设置4种处理，各处理重复3次，共12块20 m×20 m固定样地，包括对照（0%）、轻度间伐（25%）、中度间伐（45%）和强度间伐（65%），测定土壤基本理化性质及枯落物和土壤中性糖的含量及组成。[结果]根际土壤中性糖含量（4.55~7.89 mg·g^-1）显著高于非根际土壤（2.67~4.18 mg·g^-1）；间伐可显著降低根际土壤中性糖含量，且各处理间差异显著（P<0.05），分别低于对照15.34%、27.25%和42.33%；非根际土壤中性糖含量仅在强度间伐下显著降低（P<0.05）；非根际土壤中8种中性单糖含量在不同间伐强度间差异不显著，均以葡萄糖含量最高，占中性糖总量的33.21%~41.39%，其次为甘露糖（占中性糖总量的18.34%~25.09%）、半乳糖（占中性糖总量的13.87%~16.99%）、阿拉伯糖（占中性糖总量的8.45%~11.34%）、木糖（占中性糖总量的6.22%~7.91%）、鼠李糖（占中性糖总量的4.37%~6.06%）、岩藻糖（占中性糖总量的2.71%~3.26%）和核糖（含量最少，占中性糖总量的比例不到1%）；根际土壤中8种中性单糖分布规律与非根际土壤一致，且随间伐强度增加各中性单糖含量呈下降趋势，但各处理间差异除葡萄糖外均未达到显著水平；间伐可增加根际与非根际土壤中六碳糖（半乳糖+甘露糖）和五碳糖（木糖+阿拉伯糖）含量的比值，且间伐后该比值均大于2；根际与非根际土壤中性糖在总有机碳中的比例分别为16.65%~17.36%和16.75%~23.21%，且该比值均随间伐强度增加呈先降后升的趋势，在中度间伐时达到最低值。[结论]间伐可降低根际与非根际土壤中性糖总量，但对土壤中8种中性单糖含量影响不显著；间伐后土壤微生物活性增强，从而可增加土壤中性糖的微生物来源；中度间伐下根际与非根际土壤中性糖和总有机碳的比值最低，表明中度间伐有利于土壤碳库的稳定，对马尾松近熟林实施45%的间伐强度较为适宜。

关键词: 间伐强度, 马尾松人工林, 根际与非根际土壤, 中性糖

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.

Key words: intensity of thinning, Pinus massoniana plantations, rhizosphere and bulk soil, neutral sugar

中图分类号:

S718.5

叶钰倩, 赵家豪, 刘畅, 关庆伟. 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[J]. 林业科学, 2019, 55(8): 28-35.

Ye Yuqian, Zhao Jiahao, Liu Chang, Guan Qingwei. Impacts of Thinning Intensity on Neutral Sugars in Rhizosphere and Bulk Soil of Pinus massoniana Plantation[J]. Scientia Silvae Sinicae, 2019, 55(8): 28-35.

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