【作者】 常根柱； 焦婷； 周学辉； 杨红善；

【Author】 Chang Gen-zhu;Jiao Ting;Zhou Xue-hui;Yang Hong-shan;Institute of Lanzhou Animal Science and Veterinary Pharmaceutics,Chinese Academy of Agricultural Sciences(CAAS);Pratacultural College of Gansu Agricultural University;

【机构】 中国农业科学院兰州畜牧与兽药研究所； 甘肃农业大学草业学院；

【摘要】 为揭示放牧扰动下退化草地生态系统土壤-牧草养分供需水平的变化,对禁牧和放牧条件下河西走廊高寒草甸、温性草甸、山地草原和温性荒漠化草原四种不同类型草地土壤和牧草营养物质的变化进行了研究。结果表明:除高寒草甸外,其余三类草场的土壤含水量均为放牧区极显著高于禁牧区(P<0.01),四类草场土壤容重放牧区高于禁牧区;山地草原和温性荒漠化草原土壤全氮、速效氮、有机质和速效磷禁牧区高于放牧区,其它两类草场则表现不同的变化;四种类型草地牧草品质有较大的差别;除温性荒漠化草原外,其它三类草场牧草TDN含量均为禁牧区显著高于放牧区;不同类型草地牧草TDN多数与土壤容重呈显著负相关,与0~30cm土层全氮、有机质、速效氮和速效钾含量呈较高的正相关关系。更多还原

【Abstract】 To reveal the change of soil-nutrient supply and demand of degraded grassland ecosystem under grazing disturbance,we studied the soil and pasture nutrient changes of four different types of grassland Mountain grassland,Alpine meadow,Warm meadow,and Temperate desert steppe in Hexi Corridor of China.The results showed:Firstly,except alpine meadow,the other three types of pasture’s soil water content was significantly higher than the grazing areas’(P <0.01),and four types of grazing pasture’s soil bulk density was higher than those of ban grazing areas’;Secondly,alpine grassland and temperate desert steppe’s soil nitrogen,available nitrogen,organic matter and available phosphorus were high than those of ban grazing areas’,and the other two types of grassland are the performance of different changes;Four types of grassland quality had more differences;Thirdly,except temperate desert steppe,the other three TDN content of grass pastures’ fenced areas was significantly higher than the grazing areas’;In the end,the different types of turf grass TDN had most significant negative correlation to soil bulk density,and had higher positive relationship to 0~30cm of soil nitrogen,soil organic matter,available N and K content.更多还原