不同治理措施对退化紫色土土壤生物学活性的影响

Effect of Different Control Measure on Bioactivity of Purple Soil

通过对福建省宁化县禾口镇退化紫色土采取3种不同治理措施的土壤理化性质、土壤酶活性和土壤微生物特性的研究,结果表明:治理后土壤有机质、>0.25mm水稳性团聚体含量均有不同程度的提高;治理后土壤细菌、真菌、放线菌数量及微生物总数有明显的增加,土壤水解性酶和氧化还原酶活性得到显著的增强,土壤养分贮量和速效养分供应强度得到明显的改善,土壤肥力得到不同程度的恢复。表明紫色土的治理应根据其所处的不同退化阶段而采取相应的治理措施,才能使土壤的物理化学性质、土壤肥力得到较好的恢复。

The soil physical and chemistry characters, soil microbes, soil enzymes and soil respiration were studied by use of three different control measures in the seriously eroded area in Hekou, Ninghua county. The results indicated that after intensive control measure taken, the soil organic matter, >0.25mm waterstable aggregate were higher than those of the extensive control measure and the amounts of soil bacteria, fungi, actinomyces and total microbes were increased obviously, the soil hydrolytic and oxidationreduction enzymes and soil respiration were enhanced evidently, the storage of soil nutrients and supplying intensities of various available nutrients were promoted pronouncedly, demonstrating that the fertility of the soil improved on all the patterns was restored to varying degrees. Therefore, proper biological measures and essential supplementary engineering measures are effective in improving the fertility of severely degraded purple soil.