摘要
大气氮(N)沉降能够直接或间接影响土壤微生物的生长繁殖和活动能力,改变土壤微生物群落结构及功能,对土壤中物质转化及营养物质有效性产生影响.选取山西太岳山油松林,对油松天然林和人工林土壤微生物量对模拟氮沉降的响应进行了研究.2009年9月开始每月中旬进行氮处理.样地处理分别为对照(CK,0 kg hm-2a-1,以N计,下同)、低氮(LN,50 kg hm-2a-1)、中氮(MN,100 kg hm-2a-1)和高氮(HN,150 kg hm-2a-1).2011年6、8、10三个月,分0-10cm和10-20 cm两个土层采集土壤样本,用氯仿熏蒸法分别测定土壤中微生物生物量碳(MBC)、氮(MBN).结果表明:不同林分的土壤MBC、MBN差异显著(P<0.01),天然林MBC、MBN含量高于人工林.相同氮处理下,0-10 cm土壤微生物量显著高于10-20 cm土层(P<0.01).不同浓度氮添加处理对土壤MBC影响不显著(P>0.05),但是对MBN影响显著(P<0.01).MBC随着季节变化明显(P<0.01),而MBN随季节变化不大(P>0.05).
Atmospheric nitrogen deposition directly or indirectly affects the reproduction and activity of soil microbes, alters soil microbial structure and function, and also influences soil material transition and nutrient availability. This experiment was conducted in Pinus tabulaeformis forests in the Taiyue Mountain, Shanxi Province to study the responses of soil microbial biomass to simulated nitrogen addition. Nitrogen addition was carried out monthly within the forests since September, 2009. Nitrogen treatments included control （CK, 0 kg N hm^-2a^-1）, low nitrogen （LN, 50 kg N hm^-2a^-1）, medium nitrogen （MN, 100 kg N hm^-2a^-1） and high nitrogen （HN, 150 kg N hm^-2a^-1）. Soil samples were collected at 0-10 cm and 10-20 cm depths in June, August and October respectively in 2011. Soil microbial biomass carbon （MBC） and nitrogen （MBN） were measured by chloroform fumigation. The soil MBC and MBN were different between two forest types （P 〈 0.01）, soil microbial biomass in natural forest was significantly higher than that in the plantation forest. Under the same nitrogen treatment, microbial biomass at 0-10 cm depth were higher than that at 10-20 cm depth （P 〈 0.01）. Nitrogen deposition did not show any effect on soil MBC （P 〉 0.05） whereas affected soil MBN significantly （P 〈 0.01）. Soil MBC changed significantly with the season （P 〈 0.01） but MBN changed little （P 〉 0.05）. Fig 2, Tab 3, Ref32
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2013年第4期605-610,共6页
Chinese Journal of Applied and Environmental Biology
基金
国家林业公益性行业科研专项(201104009
200904022)
北京市共建项目专项(2012)资助~~
关键词
氮沉降
土壤微生物
微生物生物量碳
微生物生物量氮
油松林
太岳山
nitrogen deposition
soil microbe
microbial biomass carbon
microbial biomass nitrogen
Pinus tabulaeformisforest
Taiyue Mountain
