Effects of different de-farming and reafforestation patterns on changes of soil fertility quality in karst region of southwestern China Soil fertility quality evolution after land use change from rice-wheat rotation to plastic film covered vegetable Spatial-temporal evolution of soil fertility in Yellow River Delta——Case study in Kenli County Mutation of soil fertility quality in the red eroded area of southern China:A case study in Changting County, Fujian Province Soil fertility quality assessment under different vegetation restoration patterns Changes of soil fertility quality properties under subalpine spruce plantation in Western Sichuan Effect of long-term conservation tillage on soil fertility in rain-fed areas of the Loess Plateau