割草后施用氮肥的生态效应

Ecological Effects of Applying Nitrogen Fertilizer After Mowing.

在内蒙古锡林郭勒盟白音锡勒牧场地区的天然割草场上,几乎是连年割草,每年每公顷要取走1125—1500kg有机物质,而且基本没有能量输入,致使产草量逐年降低,草质变劣,严生地影响畜牧业的发展。为弥补因割草而损失的有机物质,使这一再生资源能得到合理利用,我们从1983—1987年进行了割草后施用氮肥的研究。由于篇幅有限。

With the application of nitrogen fertilizer (urea 112.5kg.ha^(-1)), the aboveground biomass of community increases 66.15％ as an average of 5 years. The aboveground biomass of Aneurolepidium chinense, Stipa grandis and Salsola collina increases 71.34％, 44.86％ and 269.44％ respectively. The density of community increases 63 plants.m^(-2). The density, height and individual plant weight increase 90 shoots.m^(-2), 8.48cm and 0.0275g respectively. Grasses and Chenopodiaceae Plants are more susceptible to the application of nitrogen fertilizer.