摘要
通过对川西北三种不同退化程度的几种土壤的生化活性大小及其相关性进行研究，结果表明，草地退化后其土壤生化活性受到不同程度的影响，其影响明显地与退化程度有关；土壤生化活性大小有随退化程度增高而减小的趋势，但差异并非都达到统计学上的显著性，而土壤生化活性间的相关性则显著地与草地退化程度有关，说明退化草地其土壤微生物间的协同作用受到显著影响，从而影响其土壤碳氮循环代谢途径，降低土壤肥力水平。
A study
was made on 12 soil biochemical activities in three degenerated gras-slands(Dasiphora
fruticosa shrub,Kobresia Pygmaea meadow and Festuca sinensisgrassland)of the northwestern
Sichuan in China,Results show that the soil bioche-mical activities and the correlations among
them were influenced significantly by thedegree of grassland degeneration. Soil biochemical
activities,especially cellulose de-composition,nitrogen fixation and protease activities,in the
grasslands decreasedwith the degree of grassland,though the differences wrer not statistically
signifi-cant. But the correlations among biochemical activities of the soils were significan-tly
correlated with the degree of grassland degeneration. The worse degrnerativegrassland,
Festuca sinensis grassland showed no such significant correlations amongthe 12 soil
biochemical activities.Based on the research results considered that the measures for the
improvementand amelioration of degenerated grasslands should be adopted according to the
soilecoiogical changes and the correlations among soil biochemical activities.
出处
《土壤学报》
CAS
CSCD
北大核心
1995年第2期221-227,共7页
Acta Pedologica Sinica
关键词
退化草地
土壤微生物
生化活性
川西北
Degenerated grassland,Soil microorganism,Biochemical activity
