南亚热带杉木林改造不同树种配置模式的土壤质量评价

doi:10.16843/j.sswc.2017.03.016

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Abstract [Background] The productivity and soil quality of Cunninghamia lanceolata plantation continuously decreased by managements of pure and successive plantation, short rotation, and clear-cutting harvest, which were harmful to forest sustainable development. In order to improve forest ecosystem productivity and soil quality, C. lanceolata and broadleaf mixed plantations (hereafter referred as mixed plantations) were established by planting different broadleaf tree species at the clear-cutting site of C. lanceolata plantations in south subtropics of China. [Methods] Taking soil chemical property of a 13-year-old pure C. lanceolata plantation as control, we studied the influence of tree species composition on soil characteristics at top 25 cm depth in 12 mixed plantations of 11-12 years old. We compared the differences of soil physical (bulk density, soil water content, total porosity, capillary and non-capillary porosity, and particle components) and chemical (pH, soil organic matter, total N, total P, available N, NH₄⁺-N, NO₃^--N and available P content) properties, as well as microbial biomass carbon and nitrogen content among 12 mixed plantations. Integrated soil quality index of each mixed plantation was calculated on the basis of principal component analysis. [Results] The results showed that the pH (4.15-4.71), available N (81.4-152.8 mg/kg) and available P (0.93-2.39 mg/kg) of mixed plantations were higher than those of pure C. lanceolata plantation (4.06 for pH, 30.8 mg/kg for available N and 0.76 mg/kg for available P, respectively). In contrast, the total P content of pure C. lanceolata plantation (0.34 g/kg) was higher than those of most mixed plantations (0.14-0.32 g/kg) except plantation C (0.45 g/kg). There were no consistent trends among different plantations for other soil property indexes. Soil quality index of mixed plantations varied from 0.25 to 0.64, which was higher than 0.6 in three kinds of tree species composition pattern, including 1) Mytilaria laosensis + Cinnamomum camphora + Cinnamomum burmanni + Michelia macclurei + C. lanceolata, 2) M. laosensis + Liquidambar formosana + C. camphora + Winchia calophylla + C. lanceolata,and 3) M. laosensis + L. formosana + C. camphora + Elaeocarpus sylvestris + C. lanceolata, indicating greater ability on improving soil quality than other species composition patterns. [Conclusions] M. laosensis and C. camphora could be much more helpful to improve soil quality than other species, while Syzygium hainanense and Lagerstroemia speciosa had no apparent effect. The three kinds of tree species composition pattern mentioned above should be appropriate in conversion of pure C. lanceolata plantation in south subtropics of China. The future study of stand conversion should be focused on the interspecific relationship, proportion of advantaged tree species, and density in mixed plantations.

Key words： soil quality comprehensive assessment stand conversion Cunninghamia lanceolata and broadleaf mixed plantation tree species composition south subtropics

Received: 26 September 2016

PACS:

S718.5

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	Articles by authors
	HUANG Yuhui
	ZHANG Weiqiang
	GAN Xianhua
	TANG Honghui
	PAN Lijun
	XIAN Weiguang

Cite this article:

HUANG Yuhui,ZHANG Weiqiang,GAN Xianhua, et al. Soil quality assessment on different tree species composition patterns in Cunninghamia lanceolata stand conversion in south subtropics[J]. SSWC, 2017, 15(3): 123-130.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2017.03.016 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2017/V15/I3/123

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