2008年雪灾对武夷山毛竹林土壤微生物生物量氮和可溶性氮的影响  

Impacts of snow storm in 2008 on soil microbial biomass nitrogen and dissolved nitrogen in Moso bamboo forests in Wuyi Mountains

作　　者：丁九敏[1,2] 卜晓莉[1] 刘胜[1] 徐涵湄[1] 汪家社 徐自坤 阮宏华[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏省林业生态工程重点实验室,南京210037 [2]连云港职业技术学院,江苏连云港222006 [3]福建省武夷山国家级自然保护区管理局,福建武夷山354315

出　　处：《生态学杂志》2010年第3期517-522,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30670313);国家林业公益资助项目(200804006,200704005/wb02)

摘　　要：2008年1月,我国南方发生了严重的冰冻雪灾,通过改变资源的有效性和异质性而对生态系统过程产生显著影响。本研究以福建武夷山遭受冰冻雪灾不同危害程度(轻、中、重3种类型)的毛竹林为试验地,探讨了08雪灾干扰后毛竹林不同土层(0～10、10～25、25～40cm)土壤微生物生物量氮和可溶性氮的变化特征。结果表明,除25～40cm土层土壤微生物生物量氮含量外,各土层土壤微生物生物量氮、硝态氮含量均随受灾程度的加重而显著增加,随土层深度的增加而减少,0～10cm土层土壤可溶性有机氮,重度受灾竹林也显著高于轻度与中度受灾竹林。不同受灾竹林间的土壤微生物生物量氮、硝态氮、可溶性有机氮含量均与土壤温度、雪灾输入林地生物量显著正相关,与竹林郁闭度显著负相关,与土壤湿度不相关。本研究结果揭示,由于雪灾导致生物与非生物因素的改变,土壤中的氮可能以硝酸盐和可溶性有机氮的形式从生态系统中流失。In January 2008,an extraordinarily serious snow storm and freezing disaster occurred in southern China,giving obvious impacts on the ecosystem processes via altering the resources availability and heterogeneity.Taking the Moso bamboo forests with different damaged levels（light,moderate,and heavy）in Wuyi Mountains as test sites,this paper studied the effects of this snow storm on the microbial biomass nitrogen and total dissolved nitrogen in 0-10,10-25,and 25-40 cm soil layers.Except the microbial biomass nitrogen content in 25-40 cm soil layer,the contents of microbial biomass nitrogen and nitrate in the three soil layers increased with increasing damaged level,and decreased with soil depth.The dissolved organic nitrogen content in 0-10 cm soil layer was significantly higher in heavily damaged bamboo forest than in lightly and moderately damaged bamboo forests.The contents of soil microbial biomass nitrogen,dissolved organic nitrogen,and nitrate in the forests were significantly positively correlated with soil temperature and the ground biomass input caused by the snow storm but negatively correlated with canopy closure,and had no relationship with soil moisture.It was suggested that owing to the changes of biotic and abiotic conditions caused by the snow storm,the soil nitrogen in the forests could be lost from the ecosystem in the forms of nitrate and dissolved organic nitrogen.

关 键 词：雪灾 毛竹林 土壤微生物生物量氮 硝态氮 土壤可溶性有机氮 

分 类 号：S714[农业科学—林学]