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[1]Wang Ping,Li Lushan,Ding Zhiqiang,et al.Effective Retention of Main Forest Litter and Its Influencing Factors in Central Yunnan[J].Research of Soil and Water Conservation,2024,31(03):213-221,229.[doi:10.13869/j.cnki.rswc.2024.03.008]

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Effective Retention of Main Forest Litter and Its Influencing Factors in Central Yunnan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 03 Page number: 213-221,229 Column: Public date: 2024-04-30

Title:: Effective Retention of Main Forest Litter and Its Influencing Factors in Central Yunnan

Author(s):: Wang Ping¹, Li Lushan², Ding Zhiqiang^1,3,4, Li Yuhui¹; (1.Department of Geography, Yunnan Normal University, Kunming 650500, China; 2.Zixi Middle School Chuxiong, Yunnan Province, Chuxiong, Yunnan 675099, China; 3.School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China; 4.Fujian Sanming Forest Ecosystem National Observation and Research Station, Sanming, Fujian 365002, China)

Keywords:: litter; main types of forest; water holding characteristics; effective retention; central Yunnan region

CLC:: S715.7

DOI:: 10.13869/j.cnki.rswc.2024.03.008

Abstract:: [Objective] The aims of this study are to investigate variations in the effective retention of litter within main forests and the influence factors, and to provide scientific support for future vegetation restoration and forest management. [Methods] we employed a combination of field surveys and indoor water immersion experiments within the Shuanghe-Monande Nature Reserve located in Kunming City, the central of Yunnan Province. We studied site characteristics and hydrodynamic processes of seven representative types of forest: Secondary Forest(SF), Theropencedrymion forest(TF), Alnus cremastogyne forest(ACF), Pinus armandii forest(PA), Old Pinus yunnanensis forest(OPY), Young Pinus yunnanensis forest(YPY), Acacia dealbata forest(AD). [Results](1)The litter thickness of seven types of forest ranged from 2.06 to 7.57 cm, with OL layer 1.10～4.30 cm and OF layer 0.83～3.93 cm, and ranked as TF>ACF>PA>OPY>SF>AD>YPY. The litter accumulation volume ranged from 4.75 to 17.45 t/hm², with OL layer accounting for 32.02%～62.48% and OF layer 37.52%～67.98%, and ranked as TF>PA>SF>OPY>ACF>AD>YPY.(2)The maximum water holding rate of litter was 115.3%～170.7%, and the initial water absorption rate was 3.65～5.62 g/(g·h), and their correlation with water immersion were described by logarithmic function y=aln(x)+b and power function y=ktⁿ.(3)The maximum water holding capacity of litter ranged from 7.05 to 32.19 t/hm², ranked as PA>TF>SF>OPY>ACF>AD>YPY. The effective holding capacity ranged from 5.45 to 25.34 t/hm², and TF was the highest(25.34 t/hm²), followed by PA(24.99 t/hm²)and SF(24.62 t/hm²), while YPY had the lowest capacity(5.45 t/hm²). The effective storage capacity of litter ranged from 5.45 to 25.34 t/hm², with the same ranking as water holding capacity. The site characteristics that influenced the effective storage volume included litter storage volume, natural water content, decomposition intensity, and thickness. The hydrodynamic processes affecting the effective storage volume included maximum water loss, average absorption rate in initial 6.0 hours, and average absorption rate in initial 2.0 hours. [Conclusion] For future afforestation efforts in the central Yunnan region, we recommend to prioritize the establishment of mixed needle-broad forests and conserve the zonal evergreen secondary forests. To facilitate the evolution of artificial monoculture forests towards mixed forests, it is advisable to implement measures for natural regeneration. Furthermore, it is crucial to minimize human activities, such as trampling and excessive litter collection, which can disrupt forest ecosystem. By doing so, the water retention capacity of forest system can be enhanced through effective conservation of litter.

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Last Update: 2024-04-30