云南滇池‘中山杉118’人工林及土壤的碳、氮积累特征

Carbon and nitrogen accumulation characteristics of Taxodium‘Zhongshanshan 118’plantation and soil in Dianchi of Yunnan Province

碳和氮是陆地森林生态系统的重要组分,其循环过程及相互作用对生态系统的生产力以及稳定性起着重要作用。近年来,国内外研究人员对不同区域乃至全球森林土壤的碳、氮储量和循环进行了大量研究,其中,有关碳、氮储量估算方面的研究较多[1-3]。人工林正逐步成为森林总量的关键组成部分,并在森林可持续经营管理过程中发挥着重要作用。研究人工林碳库和氮库的储量及调控机制是了解和预测全球气候变化的重要工作。

The carbon and nitrogen storage and distribution pattern of 10 a plantation of Taxodium‘Zhongshanshan 118’and soil(soil layer of 0-45 cm)were investigated in Dianchi of Yunnan Province.The results show that the contents of carbon and nitrogen in leaf,branch,and stem of T.‘Zhongshanshan 118’plantation are 439-520 and 3.34-5.22 g·kg^(-1),those in litter are 510 and 1.16 g·kg^(-1),and those in soil layer of 0-15,15-30,and 30-45 cm are 4.76-8.78 and 0.28-0.61 g·kg^(-1),respectively.The carbon and nitrogen storage in stem of T.‘Zhongshanshan 118’plantation are relatively high,accounting for 60.9%and 57.1%of that of arbor layer(including leaf,branch,and stem),respectively.The carbon and nitrogen storage in soil layer of 0-45 cm are 41.24 and 1.73 t·hm^(-2),respectively,which exhibits an obvious surface enrichment.It is suggested that T.‘Zhongshanshan 118’has a strong carbon sequestration capacity,and has a great application potential in the forest ecosystem of Dianchi region.