冷温半干旱黄土丘陵区荒坡沙打旺的种植条件和生产力研究

Growing Conditions and Productivity of Annual Erect Milkvctch Planted on Wasted Land of Loess Hilly Areas in Cool Temperate Semi-arid Region.

在海拔高程为２２７４～２４２４ｍ的冷温半干旱黄土丘陵地区，荒坡人工翻坡水平台地上种植的一年生沙打旺植株的平均高度为１２．６ｃｍ，主茎明显，并能分生出一级分茎１枚。地上部分鲜草和风干草平均亩产量分别为３０８．１ｋｇ和８６．８ｋｇ，产出能平均为１４．７７×１０￣８Ｊ／亩，光能利用率为０．０８％。干草中粗蛋白质、粗脂肪、可溶性糖和粗纤维素平均含量分别为１６４、１６．６、１３３和２８３ｇ／ｋｇ。一年生沙打旺虽具耐寒、耐瘠薄和抗风沙的生物学特征，但在避风向阳和土壤水肥状况较好的坡地上，其生长发育较快，产草量亦较高。

An annual erect milkvetch ecotype was planted for experimental observation at artificial leveling belt areas(0.8～1. 2m wide)on the slope of loess hilly wasted land at an eleva-tion from 2274 to 2424m above sea level, The plant height was 12.6cm and the main stem possessed the ability of producing one primary branch.The average fresh and dry biomass yields were estimated at 4620 and 1302kg/ha , respectively.The efficiency of light utilization was amounted to 0.08%。 The respective mean contents of crude pro-tein,crude fat,soluble sugar and crude fiber (in dried biomass)were determined as fol-lows: 16.4, 16.6, 133 and 283g/kg.