抚育间伐对马尾松林土壤活性有机碳的短期影响

doi:10.13292/j.1000-4890.202104.008

生态学杂志 ›› 2021, Vol. 40 ›› Issue (4): 1049-1061.doi: 10.13292/j.1000-4890.202104.008

抚育间伐对马尾松林土壤活性有机碳的短期影响

王晓荣^1,2,雷蕾^1,3,曾立雄^1,3,唐万鹏²,崔鸿侠²,肖文发^1,3*

(¹中国林业科学研究院森林生态环境与保护研究所，国家林业和草原局森林生态环境重点实验室，北京 100091；²湖北省林业科学研究院，武汉 430075； ³南京林业大学南方现代林业协同创新中心，南京 210037)

出版日期:2021-04-10 发布日期:2021-04-12

Short-term effects of tending thinning on soil labile organic carbon in Pinus massoniana stands.

WANG Xiao-rong^1,2, LEI Lei^1,3, ZENG Li-xiong^1,3, TANG Wan-peng², CUI Hong-xia², XIAO Wen-fa^1,3*

(¹Research Institute of Forest Ecology, Environment and Protection, ChineseAcademy of Forestry, Key Laboratory of Forest Ecology and Environment Administration of National Forestry and Grassland, Beijing 100091, China; ²Forestry Institute of Hubei Province, Wuhan 430075, China; ³Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China).

Online:2021-04-10 Published:2021-04-12

摘要/Abstract

摘要： 准确把握不同营林措施下马尾松林土壤活性有机碳变化，对于深入理解森林经营管理对土壤碳库的影响机制具有重要意义。以三峡库区马尾松林为研究对象，采用未择伐(NC)、除灌(SC)、伐除非马尾松(NPMC)、伐除优势马尾松(DPMC)等营林措施，利用固定样地等距离网格布点法研究不同营林措施下表层土壤(0～10 cm)活性有机碳组分、空间异质性，并利用多元线性回归模型确定主控因子。结果表明：与未择伐相比，除灌、伐除非马尾松和伐除优势马尾松均显著降低了土壤总有机碳(TOC)和微生物生物量碳(MBC)，且一定程度降低土壤轻组有机碳(LFOC)，但LFOC在各处理间差异性不显著。伐除非马尾松和伐除优势马尾松导致土壤可溶性有机碳(DOC)分别增加了21.68%和19.90%，而除灌则降低了7.06%。未择伐和伐除优势马尾松样地中土壤有机碳组分变异呈现较微弱的空间自相关，而除灌样地中TOC、DOC、MBC由结构因素引起的变异为69.5%～98.5%，伐除非马尾松样地中TOC、DOC、LFOC由结构因素引起的变异为94.5%～99.7%。抚育间伐提高了土壤活性有机碳的空间异质性，土壤总有机碳、总氮、碳氮比、胸径、叶面积、土壤水分等因素是调控土壤活性碳组分空间变异的主控因子。除灌和择伐通过改变林分结构、土壤理化性质以及微环境等因素共同影响土壤有机碳空间变异，并增加了土壤有机碳的不稳定性。

关键词: 马尾松, 抚育间伐, 土壤活性有机碳, 空间异质性, 影响因素

Abstract: Quantifying the variations of soil labile organic carbon in Pinus massoniana stands with different forest management practices is of great significance for understanding the impacts of forest management strategies on soil carbon pool. In this study, we examined the impacts of forest managements, including no-cutting (NC), shrubs cutting (SC), nonP. massoniana cutting (NPMC) and dominant P. massoniana cutting (DPMC), on soil labile organic carbon in P. massoniana air seeded stands in the Three Gorges Reservoir Area. We used equidistant grid point sampling method to measure the content and spatial heterogeneity of soil labile organic carbon in topsoil (0-10 cm) and used multiple linear regression model to detect the main driving factors. Our results showed that total organic carbon (TOC) content and microbial biomass carbon (MBC) were significantly lower in SC, NPMC, and DPMC plots than those in NC plot, while the content of soil light fraction organic carbon (LFOC) showed no significant variation. Compared with the NC treatment, the dissolved organic carbon (DOC) content increased by 21.68% under NPMC and increased by 19.90% under DPMC treatment, while it decreased by 7.06% under SC treatment. The variation of all soil organic carbon fractions in NC and DPMC plot had a weak spatial autocorrelation. The variation range of soil organic carbon fractions such as TOC, DOC and MBC caused by structure factors was 69.5%-98.5% in SC plot, and that of TOC, DOC, and LFOC was 94.5%-99.7% in NPMC plot. All managements increased the spatial heterogeneity of soil labile organic carbon. The main factors affecting spatial variation of soil labileorganic carbon were soil total organic carbon, total nitrogen, carbon/nitrogen ratio, diameter at breast height of trees, leaf area, and soil moisture. These results indicated that the tending thinning practices including understory removal and selective cutting measures can affect soil organic carbon and increase the instability of soil organic carbon by changing stand structure, soil physical and chemical properties, and microenvironment.

Key words: Pinus massoniana, tending thinning, soil labile organic carbon, spatial heterogeneity, influencing factor.

王晓荣, 雷蕾, 曾立雄, 唐万鹏, 崔鸿侠, 肖文发. 抚育间伐对马尾松林土壤活性有机碳的短期影响[J]. 生态学杂志, 2021, 40(4): 1049-1061.

WANG Xiao-rong, LEI Lei, ZENG Li-xiong, TANG Wan-peng, CUI Hong-xia, XIAO Wen-fa. Short-term effects of tending thinning on soil labile organic carbon in Pinus massoniana stands.[J]. Chinese Journal of Ecology, 2021, 40(4): 1049-1061.

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抚育间伐对马尾松林土壤活性有机碳的短期影响

Short-term effects of tending thinning on soil labile organic carbon in Pinus massoniana stands.

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