【摘要】 对云南岩溶地区坡度为15°草地的5种利用方式进行了3年的水土流失、土壤理化性状、地表植被密度、盖度、高度、产草量和投入产出效应研究。结果表明,岩溶地区坡地种草利用比种粮利用的水土保持效果、培肥地力效应和经济效益高。水土流失严重程度为种粮坡地>自由放牧草地>栽培草地>改良草地>围栏封育草地;土壤肥力提高幅度为栽培草地>改良草地>围栏封育草地>自由放牧草地>种粮坡地;3年累计经济纯收入栽培草地>改良草地>种粮坡地>围栏封育草地>自由放牧草地。更多还原

【Abstract】 The soil and water erosion,soil physical and chemical characteristics,grassland vegetation features and input/output ratio of grassland located on the slope over 15° in the karst area of Yunnan Province were studied for three years.The results indicated that growing forage was more effective in terms of water and soil conservation and economic benefit than cereal cropping.The severity of soil and water erosion in karst area under different land use patterns could be ranked as cereal cropping > free grazing > sowed grassland > improved natural grassland > fenced grassland.For the soil fertility improvement,however,the order was sowed grassland > improved natural grassland > fenced grassland > free grazing > cereal cropping.The total net economic profits in three years was ranked as sowed grassland > improved natural grassland > cereal cropping > fenced natural grassland > free grazing.更多还原