不同更新方式对亚热带常绿阔叶林土壤氮矿化的影响

doi:10.11707/j.1001-7488.20210403

Abstract

Abstract:

Objective: The purpose of this study was to explore the changes of soil N mineralization after the conversion of subtropical evergreen broad-leaved forest of Castanopsis carlesii to plantation or forest naturally regenerated with artificial enhancement in order to conclude the advantages in N cycling of artificial enhancement of regeneration over the traditional plantation management, therefore to provide a basis for evaluation and selection of forest management models. Method: Natural evergreen forest of Castanopsis carlesii(NF), artificially regenerated secondary forest(AR), and Castanopsis carlesii plantation (CC) in Sanming City, Fujian Province were studied. Soil ammonium nitrogen(NH₄⁺-N), nitrate nitrogen (NO₃^--N) concentrations, and soil N mineralization rate in the surface layer (0-10 and 10-20 cm) among three forest types were compared. Result: The conversions of NF to AR and CC decreased soil NH₄⁺-N, but increased NO₃^--N concentration. Compared with NF, the NH₄⁺-N concentration decreased by 5%-13% and 16%-25% in the soil of 0-10 and 10-20 cm respectively, and the NO₃^--N concentration increased by 1.4%-241% and 68%-871% respectively. The NH₄⁺-N concentration of the AR was 3%-27% higher than that of the CC, and the NO₃^--N was lower by 40%-65%. Soil net N mineralization rate of the AR and the CC was lower by 11%-12% and 27%-50% after the forest conversion, respectively. The soil net nitrogen mineralization rate of AR was significantly higher than that of CC, and the net nitrification rate was significantly lower than that of CC. Conclusion: Compared to the plantation, the artificial regeneration model caused lower human disturbances on soil leading to a higher return of litter nutrients, a higher soil net nitrogen mineralization rate, and a lower net nitrification rate. This results in a high content of inorganic N and improves soil N availability in AR. Therefore, the model of natural regeneration with artificial enhancement is beneficial to soil nitrogen preservation and improvement of nitrogen availability, also advantageous over plantation management in terms of nitrogen cycling.

Key words: forest conversion, forest management models, natural regeneration with artificial enhancement, soil nitrogen mineralization, soil nitrogen nitrification, subtropical forest

CLC Number:

S714.2

Yanli Gao,Zhijie Yang,Li Zhang,Decheng Xiong. Effects of Different Regenerated Models on Soil Nitrogen Mineralization in Subtropical Evergreen Broad-Leaved Forest[J]. Scientia Silvae Sinicae, 2021, 57(4): 24-31.

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References 0

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林分类型 Stand type	海拔 Elevation/m	林龄 Age/a	林分密度 Stand density/hm^-2	平均胸径 Mean DBH/cm	平均树高 Mean tree height/m
NF	315	260~300	1 955	20.0	11.9
NR	335	40	2 158	16.8	13.7
CP	305	40	2 042	16.6	14.2

林分类型 Stand type	土层 Soil layer/cm	pH	细根生物量 Fine root biomass/(g·m^-2)	凋落物量 Litterfall biomass/(t·hm^-2)	全氮含量 Total N content/(g·kg^-1)
NF	0~10	4.08	191.05	7.63	2.34
NF	10~20	4.10	63.30	7.63	1.48
NR	0~10	4.37	84.92	5.17	1.18
NR	10~20	4.33	53.39	5.17	0.76
CP	0~10	4.49	82.62	5.91	1.97
CP	10~20	4.37	32.63	5.91	1.36

林分类型 Stand type	土层 Soil layer/cm	净氮矿化速率 Net nitrogen mineralization rate/(mg·kg^-1d^-1)	净硝化速率 Net nitrification rate/(mg·kg^-1d^-1)
NF	0~10	0.58a	0.92a
NF	10~20	0.44a	0.25b
NR	0~10	0.51b	0.06c
NR	10~20	0.39b	0.02c
CP	0~10	0.29c	0.73b
CP	10~20	0.32c	0.38a

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Effects of Different Regenerated Models on Soil Nitrogen Mineralization in Subtropical Evergreen Broad-Leaved Forest

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