摘要
研究川西亚高山地区米亚罗林区云杉低效林不同面积林窗（50、100、150 m2）对表层（0-15 cm）、亚表层（15-30 cm）土壤有机碳含量、微生物生物量碳动态特征的影响.结果表明： 对照以及50、100、150 m2林窗表层土壤有机碳含量和微生物生物量碳在4个季节中均显著高于亚表层;各林窗处理下表层和亚表层土壤有机碳含量和微生物生物量碳在不同季节存在差异;林窗处理显著提高各季节土壤有机碳含量和微生物生物量碳,50、100、150 m2林窗表层年均土壤有机碳含量分别较对照提高35.4%、21.2%和10.3%,亚表层提高45.5%、25.0%和12.1%,在土壤表层和亚表层年均土壤微生物生物量碳分别提高26.7%、16.7%、11.3%和24.4%、12.6%、7.3%.土壤有机碳含量与土壤pH、含水量呈显著负相关,与土壤温度呈显著正相关;土壤微生物生物量碳受土壤有机碳以及土壤pH、含水量、温度变化的影响显著.林窗改造可以改善林内环境,林窗面积的增加会显著降低微生物活性和凋落物分解速率,导致土壤有机碳含量和微生物生物量碳降低.
Effects of gap sizes （50, 100 and 150 m2） on seasonal dynamics of soil organic carbon （SOC） and microbial biomass carbon （MBC） in soil surface （0-15 cm） and subsurface （15-30 cm） were investigated in a 50-year old Picea asperata plantation in Miyaluo forest, Western Sichuan, China. In the four seasons, the SOC and MBC contents were higher in the soil surface than in soil subsurface in the four treatments, and varied insignificantly in different seasons. Compared with the control, the SOC content increased by 35.4%, 21.2% and 10.3% in soil surface, and by 45.5%, 25.0% and 12.1% in soil subsurface with the forest gaps of 50, 100 and 150 m2, respectively. The MBC content increased by 26.7%, 16.7%, 11.3% and 24.4%, 12.6%, 7.3% in soil surface and subsurface, respectively. There were significant negative relationship between soil SOC content and the soil pH and moisture, and significant positive relationship between soil SOC content and soil temperature. Significant effects of SOC content, soil pH, soil temperature, soil moisture on MBC content were observed, suggesting that forest gaps could significantly affect environmental conditions, and increasing gaps could reduce microbial activity and decomposition rate and decrease soil SOC and MBC contents.
出处
《应用生态学报》
CAS
CSCD
北大核心
2014年第9期2469-2476,共8页
Chinese Journal of Applied Ecology
基金
"十二五"国家科技支撑计划项目(2011BAC09B05)
四川省科技支撑计划项目(2010NZ0049)资助
关键词
林窗
云杉
土壤有机碳
土壤微生物生物量碳
米亚罗林区
forest gap
Picea asperata
soil organic carbon
soil microbial biomass carbon
Miyaluo fore starea.
