摘要
在中国农业大学国家草地生态系统沽源野外观测站，以马铃薯地为对照，研究了北方农牧交错带退耕地建植多年生人工草地对土壤酶活性的影响。研究结果表明，退耕地种草后土壤有机质含量提高，土壤微生物繁殖速度加快，提高了土壤的脲酶、酸、碱性磷酸酶和脱氢酶活性，且0～10cm土层酶活性变化较10～20cm土层显著。土壤酶活性与土壤碳、氮含量之间呈显著、极显著的正相关关系。土壤酶活性受生长季节影响较大，但无明显的规律性变化。5种人工草地（扁穗冰草、草地雀麦、无芒雀麦、羊草和紫花苜蓿草地）土壤酶活性存在差异，但因季节因素的影响，很难确定哪种人工草地对土壤酶活性的影响最大。
The effect on soil enzyme activities of returning cultivated land to perennial artificial grassland in an agro-pastoral transitional zone of north China was studied using potato fields with one year fallow as the cultivated land. Activities of soil urease, acid- and alkaline-phosphatase, dehydrogenase were all significantly iraproved after returning the potato lands to grasslands. Enzyme activities in the 0-10 cm soil layer were higher than those in the 10-20 cm soil layer, and the activities changed irregularly with the growing season. There were significant differences in enzyme activities between five tested artificial grasslands （Agropyron cristatum, Bromus riparius , Bromus inerrnis , Leymus chinensis , and Medicago sativa ） , however, the differences depended upon the sampling season. Soil enzyme activities were significantly correlated with the concentrations of soil carbon and nitrogen, which indicated that the enzyme activities were also an important index in evaluating soil fertility.
出处
《草业学报》
CSCD
2008年第5期23-29,共7页
Acta Prataculturae Sinica
基金
国家十一五专项(2006BAD16B01)资助
关键词
农牧交错带
人工草地
耕地
土壤酶
agro-pastoral transitional zone
artificial grassland
cultivated land
soil enzyme
