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首页> 外文期刊>Plant and Soil >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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Litter production, leaf litter decomposition and nutrient return in Cunninghamia lanceolata plantations in south China: effect of planting conifers with broadleaved species

机译：中国南方杉木杉木人工林的凋落物产生，凋落物分解和养分归还：种植阔叶树的针叶树的影响

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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 super(-1)) and MCK (3.97 Mg.ha super(-1)) was significantly higher than that of PC (3.46 Mg.ha super(-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.
机译：这项研究比较了纯种和混种人工林的凋落物产量，凋落物分解和养分归还。在加利福尼亚州的一个纯杉木种植园（PC）和两个杉木种植园中，杉木与Alnus cremastogyne（MCA）和Salopanax septemlobus（MCK）的凋落物干重和N，P，K，Ca，Mg量均进行了测量。亚热带的中国。涵盖6年的观察，MCA（4.97 Mg.ha super（-1））和MCK（3.97 Mg.ha super（-1））的年平均产仔数显着高于PC（3.46 Mg.ha super（-1））。 -1））。阔叶树占MCA凋落物总产量的42％，占MCK占31％。阔叶树种的引入对凋落物格局没有明显影响。 11月至3月的旱季总凋落物数量最大。 MCA和MCK均通过凋落物返回林地的养分比PC显着更高（P <0.05）。在MCA中，通过凋落物返回林地的N，K和Mg量最高，而在MCK中，P和Ca的返回量最高。阔叶凋落物对总养分回报的贡献百分比在MCA中为41.7％至86.9％，在MCK中为49.3％至74.8％。单个叶片凋落物的分解速率按以下顺序增加：C. lanceolata

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