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论文以黄土高原子午岭林区4种林分(侧柏、油松、辽东栎、刺槐)的绿叶、凋落物(凋落叶、枯枝、果实)为研究对象,分析其C、N、P含量及化学计量学特征,并计算养分再吸收率,为黄土高原植被恢复建设及人工林合理种植规划提供理论依据。结果显示:植物叶片凋落前N、P均发生营养转移,油松N养分再吸收率最高(44.73%),刺槐P养分再吸收率最高(41.10%);刺槐相比于其他3种林分,绿叶C含量(413.94 g·kg~(-1))略低,且其4个组分N含量略高于其他林分的相应组分,绿叶、果实P含量相对较高;4种林分的枯枝C∶N、C∶P值最大,碳蓄积功能较强;叶片N∶P值均小于14,表明生长旺盛期林分主要受N限制。油松、刺槐养分再吸收能力强,是黄土高原森林区适宜植被恢复的造林树种。
In this paper, the leaf, litter (litter, dead branches, fruits) of four species (Platycladus orientalis, Pinus tabulaeformis, Quercus liaotungensis and Robinia pseudoacacia) in the Ziwuling area of the Loess Plateau were studied. The contents of C, N and P And stoichiometry, and calculate the nutrient reabsorption rate for the restoration of the Loess Plateau Vegetation and plantation planning to provide a theoretical basis. The results showed that N and P of the leaves of the locusts had the nutrient transfer before litter, the highest N recovery rate (44.73%) and the highest P (41.10%) respiration rate of Robinia pseudoacacia. Compared with the other three stands, The content of green leaf C was slightly lower (413.94 g · kg -1), and the content of N in four components was slightly higher than that of other components. The contents of P in green leaf and fruit were relatively high. C: N and C: P values of the dead branches were the largest, and the carbon accumulation function was strong. The N:P values of leaves were all less than 14, indicating that the stand of vigorous growth was mainly limited by N. Pinus tabulaeformis and Robinia pseudoacacia have strong nutrient reabsorption ability and are the afforestation species suitable for vegetation restoration in the forest area of the Loess Plateau.