摘要
对陕北黄土丘陵区农地、园地、人工草地、荒地、灌木林地、经济林地和乔木林地等7种不同土地利用类型土壤剖面4个土壤层次的土壤微生物量碳（MBC）、微生物量氮（MBN）、土壤呼吸（RS）和土壤有机质含量（SOM）进行了测定。分析了MBC，MBN，RS，SOM和全氮（TN）之间的相关性；并对土壤微生物对土壤健康的生物指示功能和土地利用类型对土壤有机质的影响进行了研究。结果表明，各土地利用类型表层土壤MBC和MBN分别在84．14～512．78和4．29～41．83mg／kg之间，RS在108．69～235．71mg／kg之间。荒地和乔木林地的土壤微生物量含量和RS值较高，农地较低；SOM在0．510％～1．547％之间，在乔木林地和经济林地较高，在农地，园地和人工草地较低，且在不同土地利用类型之间的差异显著。土壤微生物量和RS与SOC，TN显著相关，说明土壤微生物学特征可以用来表示土壤健康水平。农地转变为其它土地利用类型后会明显提高土壤微生物量和有机质含量，尤以表层土壤增幅最为明显。
Soil microbial biomass carbon （MBC）, microbial biomass nitrogen （MBN）, soil respiration （RS）, and soil organic matter （SOM） under various landuses including farmland, garden plot, artificial pasture, waste land, shrub land, economic woodland, and arbor land in the loess hilly-gully region were measured. The relationships among soil microbial biomass, soil respiration, soil organic matter （SOM）, and total nitro- gen （TN） were studied and the function of soil microbial properties as bio-indicators of soil health was illus- trated. In addition, the effects of landuse on soil organic matter were evaluated. Results indicate that the content of MBC in topsoil ranges from 84. 14-512. 78 mg/kg; the content of MBN, from 4. 29 to 41. 83 mg/kg; and the content of RS, from 108.69 to 235.71 mg/kg. The contents of microbial biomass and RS in topsoil are higher in waste land and arbor land and lower in the farmland. The content of SOM in topsoil is 0. 510%~1. 547% and it is higher in the economic woodland and arbor land and lower in the farmland, gar- den plot, and artificial pasture. Its differences are significant in various landuses. Soil microbial biomass and RS are markedly correlated with organic matter and total nitrogen and soil microbial properties can be used to indicate the health of soils. The conversion of farmland into other landuses results in a remarkable increase in the amounts of microbial biomass and soil organic matter, especially in topsoil.
出处
《水土保持通报》
CSCD
北大核心
2009年第6期10-15,共6页
Bulletin of Soil and Water Conservation
基金
中国科学院西部行动计划(二期)(KZCX2-XB2-05-03)
西北农林科技大学创新团队(01140202)
西北农林科技大学拔尖人才计划(01140102)
关键词
土地利用
土壤微生物量
土壤有机质
黄土丘陵区
landuse
soil microbial biomass
soil organic matter
loess hilly-gully region
