Litter production, leaf litter decomposition and nutrient return in Cunninghamia lanceolata plantations in south China: effect of planting conifers with broadleaved species |
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Authors: | Qingkui Wang Silong Wang Bing Fan Xiaojun Yu |
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Institution: | (1) Center for Forest Ecology and Eco-engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, 110016, China;(2) Huitong Experimental Station of Forest Ecology, Chinese Academy of Sciences, 418307 Huitong, China |
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Abstract: | This study compared litter production, litter decomposition and nutrient return in pure and mixed species plantations. Dry
weight and N, P, K, Ca, Mg quantities in the litterfall were measured in one pure Cunninghamia lanceolata plantation (PC) and two mixed-species plantations of C. lanceolata with Alnus cremastogyne (MCA) and Kalopanax septemlobus (MCK) in subtropical China. Covering 6 years of observations, mean annual litter production of MCA (4.97 Mg·ha−1) and MCK (3.97 Mg·ha−1) was significantly higher than that of PC (3.46 Mg·ha−1). Broadleaved trees contributed 42% of the total litter production in MCA and 31% in MCK. Introduction of broadleaved tree
species had no significant effect on litterfall pattern. Total litterfall was greatest in the dry season from November to
March. Nutrient returns to the forest floor through leaf litter were significantly higher in both MCA and MCK than in PC (P < 0.05). The amounts of N, K, and Mg returned to the forest floor through leaf litter were highest in the MCA, and P and
Ca returns were highest in the MCK. Percent contribution of broadleaf litter to total nutrient returns ranged from 41.7% to
86.9% in MCA and from 49.3% to 74.8% in MCK. The decomposition rate of individual leaf litter increased in the order: C. lanceolata < K. septemlobus < A. cremastogyne. Litter mixing had a positive effect on decomposition rate of the more recalcitrant litter and promoted nutrient return.
Relative to mass loss of A. cremastogyne decomposing alone, higher mass loss of the mixture of C. lanceolata and A. cremastogyne was observed after 330 days of decomposition. These results indicate that mixed plantations of different tree species have
advantages over monospecific plantations with regards to nutrient fluxes and these advantages have relevance to restoration
of degraded sites.
Responsible Editor: Alfonso Escudero. |
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Keywords: | Mixed plantation Monospecific coniferous plantation Litterfall Mixed-species litter Litterbag study |
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