Impacts of Various Tree Species on Spatial Heterogeneity of Soil Dissolved Organic Carbon in Forest Ecosystems

doi:10.11923/j.issn.2095-4050.cjas2022-0112

Abstract

Abstract:

To investigate the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of several tree species in different sampling places in a forest ecosystem, the factors affecting the spatial heterogeneity of soil dissolved organic carbon and soil organic carbon in forest ecosystem were analyzed. This project was carried out in the subtropical montane moist evergreen broad-leaved primary forest ecosystem in Ailao Mountains of Yunnan Province. Seven dominant tree species in the primary soil area of forest ecosystem with high altitude in three sampling watersheds were selected as the research objects to investigate the contents of soil dissolved organic carbon and soil organic carbon in the 0-10 cm topsoil. The results showed that the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of 5 tree species, including Lithocarpus hancei (Bentham) Rehd., Castanopsis rufescens (Hook. f. et Thoms.) Huang et Y. T. Chang., Lithocarpus xylocarpus (Kurz) Markg., Symplocos ramosissima Wall. ex G. Don and Schima noronhae Reinw. ex Bl. Bijdr, were significantly higher than those in the rhizosphere of the other 2 shrub species, namely, Camellia forrestii (Diels) Coh. St. and Vaccinium duclouxii (Levl.) Hand.-Mazz.. Among the 5 tree species, the contents of soil dissolved organic carbon and soil organic carbon in the rhizosphere of L. hancei and S. noronhae were significantly higher than those of the other 3 species, indicating that different tree species could apparently affect the spatial heterogeneity of soil dissolved organic carbon and soil organic carbon. The contents of soil dissolved organic carbon and soil organic carbon as well as the proportion of soil dissolved organic carbon in soil organic carbon in the rhizosphere of the 7 sampling tree species respectively reached the maximum value in the Laojunshanshen watershed, and decreased to the corresponding lowest value in the Sankeshu watershed, indicating that the environmental factors in different sampling watersheds could also obviously affect the contents of soil dissolved organic carbon and soil organic carbon as well as the ratio between them. The research results of this project fully proved the complexity of the spatial distribution of soil dissolved organic carbon and soil organic carbon in forest ecosystems and the diversity of environmental controlling factors, and could provide new scopes for the research on soil organic carbon composition and carbon storage in various types of forest ecosystems in the world.

Key words: soil dissolved organic carbon, soil organic carbon, L. hancei, S. noronhae, C. rufescens, L. xylocarpus, S. ramosissima, subtropical montane moist evergreen broad-leaved forest in Ailao Mountains

KONG Lingqian, LIU Xianbin, LI Yun. Impacts of Various Tree Species on Spatial Heterogeneity of Soil Dissolved Organic Carbon in Forest Ecosystems[J]. Journal of Agriculture, 2023, 13(8): 46-55.

Figures/Tables 6

References 36

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树种	科名	属名	拉丁学名	树形	生长习性	胸径/cm	树高/m	冠幅/m
硬壳柯	壳斗科	柯属	Lithocarpus hancei (Bentham) Rehd.	高大乔木	常绿阔叶树种	20~25	12~15	8~10
变色锥	壳斗科	锥属	Castanopsis rufescens (Hook. f. et Thoms.) Huang et Y. T. Chang	高大乔木	常绿阔叶树种	20~25	12~15	8~10
云南连蕊茶	山茶科	山茶属	Camellia forrestii (Diels) Coh. St.	中小灌木	常绿阔叶树种	—	2~3.5	1.5~2
云南越桔	杜鹃花科	越橘属	Vaccinium duclouxii (Levl.) Hand.-Mazz.	中小灌木	常绿阔叶树种	—	2~3.5	1.5~2
木果柯	壳斗科	柯属	Lithocarpus xylocarpus (Kurz) Markg.	高大乔木	常绿阔叶树种	35~40	15~20	13~15
多花山矾	山矾科	山矾属	Symplocos ramosissima Wall. ex G. Don	小型乔木	常绿阔叶树种	7~8	1.5~2	3~4
南洋木荷	山茶科	木荷属	Schima noronhae Reinw. ex Bl. Bijdr.	高大乔木	常绿阔叶树种	20~25	12~15	8~10

树种	科名	属名	拉丁学名	树形	生长习性	胸径/cm	树高/m	冠幅/m
硬壳柯	壳斗科	柯属	Lithocarpus hancei (Bentham) Rehd.	高大乔木	常绿阔叶树种	20~25	12~15	8~10
变色锥	壳斗科	锥属	Castanopsis rufescens (Hook. f. et Thoms.) Huang et Y. T. Chang	高大乔木	常绿阔叶树种	20~25	12~15	8~10
云南连蕊茶	山茶科	山茶属	Camellia forrestii (Diels) Coh. St.	中小灌木	常绿阔叶树种	—	2~3.5	1.5~2
云南越桔	杜鹃花科	越橘属	Vaccinium duclouxii (Levl.) Hand.-Mazz.	中小灌木	常绿阔叶树种	—	2~3.5	1.5~2
木果柯	壳斗科	柯属	Lithocarpus xylocarpus (Kurz) Markg.	高大乔木	常绿阔叶树种	35~40	15~20	13~15
多花山矾	山矾科	山矾属	Symplocos ramosissima Wall. ex G. Don	小型乔木	常绿阔叶树种	7~8	1.5~2	3~4
南洋木荷	山茶科	木荷属	Schima noronhae Reinw. ex Bl. Bijdr.	高大乔木	常绿阔叶树种	20~25	12~15	8~10

山谷	土壤可溶性有机碳含量(g/kg±SE)
山谷	硬壳柯	变色锥	云南连蕊茶	云南越桔	木果柯	多花山矾	南洋木荷
老君山神	75.43^a(5.17)	51.52^a(4.59)	31.06^a(4.15)	29.05^a(3.38)	60.33^a(4.87)	41.19^a(3.43)	81.03^a(6.23)
三棵树	50.63^c(4.30)	39.36^b(3.88)	21.33^b(2.94)	22.55^b(2.63)	38.31^b(4.86)	34.18^b(5.20)	45.58^c(3.76)
山门口	63.09^b(6.07)	48.08^a(3.87)	28.99^a(3.35)	25.41^b(2.02)	56.54^a(4.46)	43.77^a(4.22)	64.81^b(5.49)

山谷	土壤可溶性有机碳含量(g/kg±SE)
山谷	硬壳柯	变色锥	云南连蕊茶	云南越桔	木果柯	多花山矾	南洋木荷
老君山神	75.43^a(5.17)	51.52^a(4.59)	31.06^a(4.15)	29.05^a(3.38)	60.33^a(4.87)	41.19^a(3.43)	81.03^a(6.23)
三棵树	50.63^c(4.30)	39.36^b(3.88)	21.33^b(2.94)	22.55^b(2.63)	38.31^b(4.86)	34.18^b(5.20)	45.58^c(3.76)
山门口	63.09^b(6.07)	48.08^a(3.87)	28.99^a(3.35)	25.41^b(2.02)	56.54^a(4.46)	43.77^a(4.22)	64.81^b(5.49)

山谷	土壤有机碳含量(g/kg±SE)
山谷	硬壳柯	变色锥	云南连蕊茶	云南越桔	木果柯	多花山矾	南洋木荷
老君山神	122.24^a(15.47)	92.23^a(6.32)	85.03^a(6.55)	78.52^a(6.63)	111.29^a(9.40)	90.84^ab(8.72)	120.53^a(12.16)
三棵树	97.29^b(8.97)	82.38^b(7.04)	76.93^b(6.49)	72.83^a(5.13)	91.77^b(8.61)	82.86^b(8.34)	91.19^b(7.72)
山门口	111.45^ab(11.91)	96.48^a(6.41)	85.91^a(5.72)	75.09^a(7.12)	109.05^a(7.89)	101.73^a(8.10)	107.78^ab(8.26)