间伐对杉木人工林土壤微生物生物量碳氮的短期影响

doi:10.3969/j.issn.1000-2006.201906007

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南京林业大学学报（自然科学版） ›› 2020, Vol. 44 ›› Issue (5): 125-131.doi: 10.3969/j.issn.1000-2006.201906007

间伐对杉木人工林土壤微生物生物量碳氮的短期影响

郭传阳¹(), 林开敏¹^,^*(), 郑鸣鸣¹, 任正标¹, 李茂¹, 郑宏², 游云飞², 陈志云³

1.福建农林大学林学院,国家林业和草原局杉木工程技术研究中心,福建福州 350002
2.福建省洋口国有林场,福建南平 353211
3.福建省埔上国有林场,福建南平 353205

收稿日期:2019-06-05 出版日期:2020-10-30 发布日期:2020-11-19
通讯作者: 林开敏
基金资助:
国家重点研发计划(2016YFD0600301);福建农林大学科技创新专项基金项目(CXZX2017109);福建农林大学科技创新专项基金项目(CXZX201657)

Short-term effects of thinning on soil microbial biomass carbon and nitrogen in a Cunninghamia lanceolata plantation

GUO Chuanyang¹(), LIN Kaimin¹^,^*(), ZHENG Mingming¹, REN Zhengbiao¹, LI Mao¹, ZHENG Hong², YOU Yunfei², CHEN Zhiyun³

1. China Fir Engineer Research Center of National Forestry and Grassland Administration, College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2. Yangkou State-owned Forest Farm of Fujian Province, Nanping 353211, China
3. Pushang State-owned Forest Farm of Fujian Province, Nanping 353205, China

Received:2019-06-05 Online:2020-10-30 Published:2020-11-19
Contact: LIN Kaimin

摘要/Abstract

摘要：

【目的】探究大径材培育目标下间伐对杉木人工林土壤微生物生物量碳氮的短期影响,为缓解杉木人工林地力衰退问题和大径材定向培育提供指导。【方法】以16年生杉木人工林为对象,采用完全随机区组设计,设置3种间伐强度,分别为强度间伐(32%,编号HIT)、弱度间伐(23%,编号LIT)、对照组(0%,编号CK),研究不同间伐条件下杉木人工林的土壤微生物生物量碳(SMBC)、生物量氮(SMBN)含量的变化及其化学计量特征[土壤微生物生物量碳、氮含量比,土壤微生物生物量碳、氮与土壤全碳(TC)、全氮(TN)含量比,即SMBC/SMBN、SMBC/TC、SMBN/TN]之间的差异。【结果】在不同间伐强度下,杉木人工林不同土层SMBC、SMBN含量及SMBN/TN的值从大到小依次为HIT、LIT、CK;SMBC/TC的值除在≥10~20 cm土层以强度间伐(HIT)最高之外,其他土层均以弱度间伐(LIT)最高;SMBC/SMBN的值除在≥20~40cm土层,以CK最高外,其他土层均以LIT处理最高;从土壤的垂直分布特征来看,杉木人工林SMBC、SMBN含量从大到小依次为0~10、≥10~20、≥20~40 cm,即呈现出SMBC、SMBN含量随土层加深而降低的趋势。【结论】强度间伐对SMBC、SMBN含量影响明显,可能有利于提高土壤肥力;加强对土壤地力的维护,从而改善杉木大径材的培养。

关键词: 杉木人工林, 间伐, 土壤微生物生物量碳, 土壤微生物生物量氮, 全碳, 全氮, 化学计量特征

Abstract:

【Objective】The short-term effects of thinning on soil microbial biomass carbon (SMBC) and nitrogen (SMBN) in a Chinese fir (Cunninghamia lanceolata) plantation were investigated. The results of this study provide important information for alleviating the decline in soil fertility in Chinese fir plantations and for targeted cultivation of large diameter Chinese fir plantation.【Method】Soil microbial biomass C and N and stoichiometric characteristics [specifically the mass of SMBC to SMBN, and the percentage of SMBC and SMBN relative to soil total carbon (TC), and total nitrogen (TN), respectively] at depths of 0-10, ≥10-20 and ≥20-40 cm were examined in a 16-year-old Chinese fir plantation. Three thinning intensities were implemented in a completely randomized block design: high-intensity thinning (HIT), light-intensity thinning (LIT) and non-thinning (CK).【Result】In relation to thinning intensity, the values for SMBC, SMBN and SMBN/TN in all soil layers were in the order: HIT > LIT > CK. The SMBC/TC value was highest under LIT in all soil layers except for ≥10-20 cm, which was highest under HIT. The ratio of SMBC to SMBN was highest under LIT in all soil layers except for ≥20-40 cm, which was highest in the CK. Regarding the vertical distribution in the soil profile, the amount of SMBC and SMBN decreased with soil depth.【Conclusion】These findings suggest that HIT has a significant effect on SMBC and SMBN which may be beneficial in maintaining and improving soil fertility, and in the cultivation of large diameter Chinese fir timber.

Key words: Chinese fir (Cunninghamia lanceolata) plantation, thinning, soil microbial biomass carbon (SMBC), soil microbial biomass nitrogen (SMBN), total carbon (TC), total nitrogen (TN), stoichiometric characteristics

中图分类号:

S714

郭传阳,林开敏,郑鸣鸣,等. 间伐对杉木人工林土壤微生物生物量碳氮的短期影响[J]. 南京林业大学学报（自然科学版）, 2020, 44(5): 125-131.

GUO Chuanyang, LIN Kaimin, ZHENG Mingming, REN Zhengbiao, LI Mao, ZHENG Hong, YOU Yunfei, CHEN Zhiyun. Short-term effects of thinning on soil microbial biomass carbon and nitrogen in a Cunninghamia lanceolata plantation[J].Journal of Nanjing Forestry University (Natural Science Edition), 2020, 44(5): 125-131.DOI: 10.3969/j.issn.1000-2006.201906007.

图/表 6

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间伐处理 thinning	间伐强度/% thinning intensity	郁闭度 canopy density	平均树高/m mean tree height	平均胸径/cm mean DBH	林分密度/ (株·hm^-2) density of stand	单株材积/m³ individual volume
强度间伐high intensive thinning(HIT)	32	0.61	15.80±1.19	20.29±1.10	900	0.29±0.03
弱度间伐light intensive thinning(LIT)	23	0.72	15.62±0.68	19.33±0.72	1 200	0.26±0.02
对照组control(CK)	0	0.81	16.17±1.48	17.50±0.94	1 415	0.21±0.04

间伐对杉木人工林土壤微生物生物量碳氮的短期影响

Short-term effects of thinning on soil microbial biomass carbon and nitrogen in a Cunninghamia lanceolata plantation

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