title: [Effects of different de-farming and reafforestation patterns on changes of soil fertility quality in Karst region of southwestern China].
abstract: A ten-year fixed site harnessing was conducted in the severely eroded karst region of Ziyun County, Guizhou Province by adopting four different de-farming and reafforestation patterns, and the properties of soil chemistry, soil microbiology, and soil enzymology after harnessing were determined in 2003. The results showed that the total amount of soil microbes and the individuals of bacteria, fungi and actinomyces were increased obviously, the activities of soil hydrolytic and oxidoreductive enzymes and the soil respiration rate enhanced evidently, and the storage of soil nutrients as well as their supplying intensities promoted pronouncedly, demonstrating that the soil quality in all adopted patterns was improved in varying degrees. The values of soil integrated fertility index (IFI) had an increasing trend. Therefore, proper biological measures and essential supplementary engineering measures were effective in improving the soil fertility quality of severely degraded karst region.
authors.affiliation: College of Geography and Biology Science, Guizhou Normal University, Guiyang 550001, China. longjian22@163.com
authors.forename: Jian
authors.initials: J
authors.lastname: Long
authors.forename: Qiqiong
authors.initials: Q
authors.lastname: Deng
authors.forename: Yinrong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
mesh_terms: D002681:China; D018556:Crops, Agricultural / Q000254:growth & development*; D005308:Fertilizers; D006109:Poaceae / Q000254:growth & development; D012987:Soil / Q000032:analysis*; D014197:Trees / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D012987:Soil