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研究不同土地利用和轮作方式对旱地红壤肥力的影响对提高红壤质量具有十分重要的指导意义。本研究以湖南省桃源县的林地、大豆-油菜轮作、玉米-休闲轮作土壤为研究对象,明确了林地、农地土壤及农地不同轮作方式对土壤化学和生物性质的影响。结果表明,林地土壤的pH、有机碳、速效养分、微生物生物量碳及酶活性(纤维素酶、酸性磷酸酶、转化酶、蛋白酶)均显著高于农地土壤;大豆-油菜轮作土壤的pH、养分含量、微生物生物量碳含量及其微生物熵在大多数情况下高于玉米-休闲轮作,但轮作处理对各酶活性的影响并不完全一致。这种不一致性可能与不同酶对由不同利用和轮作方式导致的土壤性质差异的敏感性不同所致。土壤有机碳和pH与各生物指标均呈显著正相关关系,表明提高该地区的土壤有机碳含量对于维持土壤的生化性质具有重要的作用。
Studying the effects of different land use and crop rotation on red soil fertility in dry land is of great significance to improve the quality of red soil. In this study, the forestland, soybean-rapeseed rotation and corn-fallow rotation soil in Taoyuan County of Hunan Province were selected to study the effects of different rotation patterns of woodland, farmland and farmland on soil chemical and biological properties. The results showed that soil pH, organic carbon, available nutrients, microbial biomass carbon and enzyme activities (cellulase, acid phosphatase, invertase, protease) in forest soil were significantly higher than those in farmland soils. The soil pH In most cases, nutrient content, microbial biomass carbon content and microbial entropy were higher than those of maize - fallow rotation, but the effects of rotation on enzyme activities were not exactly the same. This inconsistency may be due to the different enzyme sensitivity to differences in soil properties caused by different utilization and rotation patterns. Soil organic carbon and pH had significant positive correlation with each biological index, indicating that increasing soil organic carbon content in this area played an important role in maintaining the biochemical properties of soil.