中亚热带不同树种对土壤团聚体组成及其碳、氮含量的影响

doi:10.11707/j.1001-7488.20220406

Abstract

Abstract:

Objective: The objective of this study was to assess the early influence of plantations with different local tree species on the compositions of soil aggregates and their organic carbon and nitrogen concentrations and storage. This study was designed to provide more theoretical basis for rational selection of tree species in afforestation and forest management in subtropical China. Method: A common-garden planted with dominated tree species in central subtropical China was established in a forest stand with the same parent material and forest management through a randomized block design in February 2012. Soil samples were collected at different soil layers (0-10, 10-20, 20-30, 30-40, and 40-50 cm depths) at plantations of six tree species (Schima superba, Castanopsis carlesii, Elaeocarpus decipiens, Cinnamomum camphora, Cunninghamia lanceolate and Pinus massoniana) in August 2019. The particle size compositions (>2, 1-2, 0.25-1, and 0.053-0.25 mm), and their carbon and nitrogen concentrations, storage and carbon to nitrogen ratios were determined. Result: 1) The dominated aggregate mass percentage was observed in >2 mm particles in all soil layers, and the mass percentage of >2 mm particles decreased with increasing soil depth. The mass percentage of >2 mm particles were the highest in soils planted with Castanopsis carlesii, whereas the mass percentages of 1-2, 0.25-1, and 0.053-0.25 mm particles were the highest in soils planted with Pinus massoniana. 2) The organic carbon concentrations in aggregates of all particle sizes decreased with increasing soil depth and the organic carbon concentrations in aggregates increased but then decreased with the decreasing particle sizes at all of the studied soil layers. The organic carbon concentrations in aggregates were the highest in the 1-2 mm particles for 0-10 cm soil layers, while those were the highest in 0.25-1 mm particles for 10-20, 20-30, 30-40, and 40-50 cm soil layers, with the highest concentrations observed in soils planted with Castanopsis carlesii. 3) The nitrogen concentrations in aggregates were the highest in soils planted with Castanopsis carlesii and the lowest in soils planted with Cinnamomum camphora for all particle sizes and soil layers. 4) The patterns of organic carbon and nitrogen storage were consistent with the variations of the compositions of soil aggregates at all soil layers. The organic carbon and nitrogen storage in the >2 mm particles were the highest in soils planted with Castanopsis carlesii, while those in the other particles with sizes less than 2 mm were the highest in soils planted with Pinus massoniana except for the 0-10 cm soil layer. 5) The carbon to nitrogen ratios in all aggregates were higher in surface soils (0-20 cm) but lower in deeper soils (30-50 cm). Conclusion: The compositions of aggregates at all of the studied soil layers was dominated by >2 mm particles, and their mass percentage showed decreasing tendency towards deeper soils after 7 years of plantation for all tree species. The mass percentage of >2 mm particles was the highest in soils planted with Castanopsis carlesii, while those for other particles with sizes less than 2 mm were the highest in soils planted with Pinus massoniana. Meanwhile, the carbon and nitrogen storage in aggregates were strongly controlled by the mass percentages of soil aggregates than by their concentrations in these particles. The soils planted with Castanopsis carlesii had higher carbon and nitrogen storage than the soils planted with Pinus massoniana.

Key words: soil aggregates, particle composition, carbon and nitrogen storage, common-garden, mid-subtropical forest

CLC Number:

Jing Yang,Yaoyi Zhang,Siyi Tan,Shu Liao,Dingyi Wang,Kai Yue,Xiangyin Ni,Fuzhong Wu,Yusheng Yang. Effects of Different Tree Species on the Compositions of Soil Aggregates and Their Carbon and Nitrogen Concentrations in Mid-Subtropical Forests[J]. Scientia Silvae Sinicae, 2022, 58(4): 51-61.

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References 0

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树种 Tree species	DBH/cm	树高 Tree height/m	郁闭度 Canopy density	林下植被盖度 Understory vegetation coverage(%)	叶片生物量 Leaf biomass/(t·hm^-2)	树枝生物量 Twig biomass/(t·hm^-2)	树干生物量 Stem biomass/(t·hm^-2)
木荷S. superba	8.79±0.46c	6.44±0.29a	0.75±0.03a	23±14b	1.25±0.08bc	1.43±0.12c	7.02±0.62b
米槠C. carlesii	11.82±0.47bc	7.20±0.80b	0.47±0.13a	60±17ab	1.00±0.19c	1.92±0.38c	7.50±1.53b
杜英E. decipiens	12.63±0.34b	6.80±0.21b	0.65±0.10a	73±12a	1.68±0.12bc	7.72±1.15a	21.04±2.66a
香樟C. camphora	8.79±1.19c	5.96±0.57b	0.80±0.03a	83±3a	1.95±0.32b	3.26±0.75bc	10.31±2.05b
杉木C. lanceolata	16.81±1.18a	11.33±0.69b	0.53±0.18a	83±7a	5.07±0.34a	4.47±0.30b	20.28±1.37a
马尾松P. massoniana	9.71±0.56bc	6.29±0.37b	0.53±0.03a	67±9ab	0.86±0.11c	1.85±0.24c	7.65±1.00b

项目Item	树种 Tree species		土层 Soil depth		粒径 Particle size		树种×土层 Tree species×soil layer		树种×粒径 Tree species×particle size		土层×粒径 Soil layer×particle size		树种×土层×粒径 Tree species×soil layer×particle size
项目Item	F	P	F	P	F	P	F	P	F	P	F	P	F	P
土壤团聚体质量百分含量 Mass percentage of soil agglomerates	< 0.001	1.000	< 0.001	1.000	779.218	< 0.001	< 0.001	1.000	7.824	< 0.001	6.131	< 0.001	0.761	0.895
土壤团聚体有机碳含量 Organic carbon concentration of soil agglomerates	23.604	< 0.001	194.187	< 0.001	8.311	< 0.001	1.742	0.028	0.192	1.000	1.350	0.192	0.170	1.000
土壤团聚体全氮含量Total nitrogen concentration of soil agglomerates	10.126	0.001	5.811	0.001	1.328	0.266	1.010	0.451	0.165	1.000	0.407	0.960	0.336	1.000
土壤团聚体碳氮比 C/N ratio of soil agglomerates	5.472	< 0.001	58.427	< 0.001	6.108	< 0.001	2.324	0.002	0.204	0.999	0.188	0.999	0.280	1.000
土壤团聚体有机碳储量 Organic carbon storage of soil agglomerates	3.230	0.008	24.226	< 0.001	793.906	< 0.001	0.317	0.998	8.985	< 0.001	26.422	< 0.001	0.795	0.851
土壤团聚体全氮储量 Total nitrogen storage of soil agglomerates	3.357	0.006	0.766	0.548	243.609	< 0.001	0.472	0.975	4.881	< 0.001	2.679	0.002	0.535	0.997

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Effects of Different Tree Species on the Compositions of Soil Aggregates and Their Carbon and Nitrogen Concentrations in Mid-Subtropical Forests

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