几种豆科牧草旱作条件下的牧草产量分析

Forage Yield Evaluation of Chinese and American Legume Collections on Dryland Sites.

对选自中国和美国的１２份豆科牧草材料／品种在内蒙古干旱和半干旱地区旱作条件下进行了牧草产量试验和分析。来源于内蒙古当地的豆科牧草产量显著优于引自北美的供试品种。在干旱地区，直立黄芪、扁蓿豆、达乌里胡枝子和牛枝子适应性较好，其中直立黄芪牧草产量最高。在半干旱地区，沙打旺牧草产量最高，但稳产性低于扁蓿豆和达乌里胡枝子。来源于北美的供试材料在内蒙古干旱地区不能收获牧草，在半干旱地区降水丰年播种可收获一定产量。生长季降水量和牧草的生长年限对牧草产量的年际变化有重要影响，影响程度因牧草种性及其生境不同而异。

Twelve legume collections/cultivars (7 Chinese and 5 Americans) were evaluated for forage yield on dryland sites in arid and semi arid areas of Inner Mongolia. Results showed Chinese legumes outformed American cultivars. Four accessions native to Inner Mongolia, ASAD Bai Astragalus adsurgens, MERU Bai Melilotoides ruthenica, LEDA Bai Lespedeza davurica and LEPO Bai Lespedeza potaninii, were of the best performance on the site of arid area, with ASAD Bai Astragalus adsurgens having the highest yield. Two accessions of Chinese cultivar Shadawang Astragalus adsurgens had the highest yields in semi arid area. American entries failed to establish stands in arid area and had good stands but lower yields in semi arid area when seeded in a good rainfall year. Yearly yields of most entries varied with rainfall of growing seasons and with plants’ growing years.