杉木、木荷纯林与混交林凋落物动态及C归还研究
首发时间:2010-02-03
摘要:通过对杉木人工林、木荷人工林和杉荷人工混交林凋落物量及C归还量进行两年的动态研究发现,3种人工林的年均凋落物量分别为2470.85kg•hm-2•y-1、4171kg•hm-2•y-1和4285.99 kg•hm-2•y-1,不同人工林中凋落量均以叶为主,其所占比例范围达到68.62-87.26%。杉木人工林凋落物量每年出现3次较大峰值,分别出现在4-5月、7月和12月,而木荷人工林和杉荷人工混交林凋落物在3月份达到最大,占到全年凋落物量的20%以上。与人工纯林相比,混交林增加了阔叶树种的单株凋落物产量,但显著减少了针叶树种的凋落物产量。3种人工林的C年归还量大小顺序与年均凋落量相同,杉荷人工混交林最高(2.12t•hm-2•y-1),杉木人工林最低(1.19t•hm-2•y-1)。
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Litter dynamics of Cunninghamia Lanceolata, Schima superba and their mixed plantation
Abstract:Litterfall and the associated C return of Cunninghamia Lanceolata,, Schima superba and their mixed plantation were observed for two years. It was found that annual litterfall ranged from 2470.85kg•hm-2•y-1 in Cunninghamia Lanceolata plantation to 4285.99 kg•hm-2•y-1 in mixed plantation. Leaf litterfall dominated the total litterfall in all the three plantations, which ranged from 68.62-87.26%. There were three litterfall peaks in a year, which occurred in April-May, July and December for Cunninghamia Lanceolata plantation, while for Schima superba plantation and mixed plantation, Litterfalls peaked in March, which accounted for over 20% of annual litter fall. Compared with the pure plantation, the litterfall of broadleaf in mixed plantation was increased, but the Cunninghamia Lanceolata litterfall was decreased. The magnitude rank of annual C return was in agreement with that of litterfall, which was highest in mixed plantation(2.12t•hm-2•y-1),lowest in Schima superba plantation(1.19t•hm-2•y-1).
Keywords: Cunninghamia Lanceolata Schima superba mixed plantation litterfall C return
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