摘要
测定了不同植被恢复类型[包括撂荒地、沙棘灌木林、华北落叶松人工林和混交林(主要由华北落叶松、白桦和山杨组成)]土壤有机碳、总氮、硝态氮、铵态氮及与氮代谢有关的土壤微生物数量(细菌、放线菌、真菌、固氮菌、硝化细菌和反硝化细菌)的季节动态。结果表明,不同植被类型土壤无机氮和微生物数量存在显著的季节波动,土壤有机碳、总氮、硝态氮、铵态氮和不同种类的微生物数量随土壤深度的加深而显著降低。沙棘灌木林、华北落叶松人工林和混交林3种植被类型的土壤有机碳氮、无机氮以及微生物数量均较撂荒地高,其中自然恢复的混交林提高幅度最大,土壤碳、氮和微生物数量分别提高了0.21%～2.05%和0.09%～19.25%,真菌最大提高幅度可达19.25%,无机氮含量增幅较小,为0.01%～0.49%。土壤有机碳、总氮、无机氮与微生物数量间呈显著线性正相关。总之,不同植被恢复后土壤肥力均会显著提高,但以次生混交林对土壤肥力提高效果最明显。
Taking four vegetation restoration types,including abandoned land,Hippophae rhamnoides shrub,Larix principis-rupprechtii plantation,and mixed forest（mainly consisted of L.principis-rupprechtii,Betula platyphylla,Populus davidiana）,in Guandi Mountain as test objects,this paper studied the seasonal variations of soil organic carbon,total nitrogen,NO-3-N,NH＋4-N,and of the quantities of soil microbes relating to nitrogen metabolism（bacteria,actinomycetes,fungi,N-fixing bacteria,nitrifiers,and denitrifiers）.In the four vegetation restoration types,an obvious seasonal variation was observed in the soil inorganic N content and microbial quantity,and the soil organic carbon,total nitrogen,NO-3-N,NH＋4-N,and microbial population were decreased significantly with increasing soil depth.Compared with abandoned land,the soil organic carbon,total nitrogen,NO-3-N,NH＋4-N,and microbial population in H.rhamnoides shrub,L.principis-rupprechtii plantation,and mixed forest were all higher,with the highest values in mixed forest,in which,soil carbon and nitrogen,and soil microbial population increased by 0.21%-2.05% and 0.09%-19.25%,respectively,soil fungi increased up to 19.25%,and soil inorganic nitrogen increased by 0.01%-0.49%.There were significant positive linear relationships between soil organic carbon,total N,NO-3-N,and NH＋4-N and soil microbial population.In sum,vegetation restoration improved soil fertility,and the effect was most significant in mixed forest.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第11期2102-2110,共9页
Chinese Journal of Ecology
基金
国家科技支撑计划项目(2008BAD95B04)
山西省农业攻关资助项目(2008-03-11075)
关键词
植被类型
总氮
无机氮
微生物数量
季节变化
vegetation type
total nitrogen
inorganic nitrogen
microbial quantity
seasonal change
