黄土高原丘陵区坡改梯后的土壤质量效应

采用时空互代法,以黄土丘陵区纸坊沟流域不同年限梯田为研究对象,选取坡耕地为对照,分析了坡耕地改造梯田后,土壤物理、化学和生物学性质的演变过程.结果表明,黄土丘陵区坡耕通过工程措施改造为梯田当年,在土壤扰动和水土流失双重作用下,土壤物理、化学和生物学质量呈现不同程度下降或没有显著变化.随着改造年限的延长,土壤质量显著提高...

Effects of terracing slope cropland on soil quality in Hilly Region of Loess Plateau

Terraces at different years in loess hilly region were chosen as subject to reveal changes in soil phyico-chemical and biological properties after slope cropland was rebuild to terraces. The results showed that slope cropland had a low content of phyico-chemical and biological quality because of serious soil erosion and improper cultivation. Soil phyico-chemical and biological properties had no remarkable change or a little drop in the first year of terracing under the action of soil disturbance and the reduction of erosion. Soil qualities (including of soil physical properties and anti-erodibility, chemical properties, microbial biomass and activity) were improved significantly with the terracing age. Soil quality index (SQI), integral indicator to reflect soil phyico-chemical and biological properties, appeared linear increasing with years by regression analysis. In brief, when slope cropland was rebuilded to terrace, soil was managed scientifically and soil quality was significantly improved.