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

doi:10.3969/j.issn.1000-2006.201906007

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2020, Vol. 44 ›› Issue (5): 125-131.doi: 10.3969/j.issn.1000-2006.201906007

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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 E-mail:2759334615@qq.com;lkmyx@163.com

Abstract

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

CLC Number:

S714

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, 2020, 44(5): 125-131.

Figures/Tables 6

Table 1

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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

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

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