文档介绍：
特大冰雪害后杉木人工林土壤碳氮动态变
化#
谢昕云,王勤,杨佳,徐小牛
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(安徽农业大学林学与园林学院,合肥 230036)
摘要:冰雪灾害是对森林生态系统破坏性极大的自然干扰因子。2008 年 1 月我国南方发生了严重的冰冻雪
灾,造成大面积森林遭受严重破坏。为了探讨冰雪灾害对森林生态系统养分循环的影响,对安徽老山自然
保护区不同受损程度(轻、中、重 3 种类)的 13 年生杉木林地表凋落物层和土壤的碳氮动态特点进行了为
期 2 年的监测。结果表明,不同受害林地凋落物层蓄积量为 - t hm-2,其中雪灾引发的非正常
凋落物量达 - t hm-2;凋落物层有机碳和全氮储量分别为 - t hm-2 和 - kg
hm-2。灾后 2 年,0-10 cm 表土有机碳含量不同受损林分都有不同程度的提高(%-%),而 10-30 cm
土层略有降低。土壤全氮含量变化显著,0-10 cm 表土全氮降低了 %-%,并随林分受损程度加重降
低幅度增大。重度和中度受损林分表层土壤(0-10 cm)微生物生物量碳氮含量下降明显,显著低于轻度受
损林分。土壤可溶性有机碳和全氮含量随受害程度增加而显著下降,分别降低了 %-%、%-%。
研究结果表明雪灾干扰引起土壤生物地球化学过程明显变化,表层土壤微生物生物量碳氮和可溶性有机碳、
全氮等指标对干扰十分敏感。
关键词:冰雪害;土壤微生物生物量;有机碳;可溶性有机碳;可溶性氮
中图分类号:S154; S714
Dynamical patterns of anic carbon and nitrogen in a
Chinese-fir plantation after the extremely heavy glaze and
snow storms occurred in early 2008
XIE Xinyun, WANG Qin, YANG Jia, XU Xiaoniu
(School of Forestry & Landscape Architecture, Anhui Agricultural University, Hefei 230036)
Abstract: IGlaze and snow storms are important natural disturbances affecting forest ecosystems
with a surprisingly severe damage. In January 2008, an extremely heavy glaze and snow-storm
occurred in southern China, resulting in severe damage on the forest ecosystems. In order to reveal
the impact of heavy snow-storm on nutrient cycling in forest ecosystems, the dynamical patterns
anic C and N in forest floor and mineral soil in a 13-year-old Cunninghamia lanceolata
plantation with different (slight, moderate and severe) damages were monitored over two years
after the disturbance of snow-storm in January 2008. The forest floor mass was ranged from
to t hm-2 for the differently damaged stands, with a range of to t hm-2 of
necromass from the snow disturbance. The necromass on the forest floor increased with an
increasing damaged level. The amounts anic C and total N accumulated on forest floor were
基金项目:教育部高等学校博士学科点专项科研基金项目(2009