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

Abstract

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

CLC Number:

S718.5

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

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