氮是草原生态系统中重要的元素之一。从牧草到草地动物——绵羊——之间,有效地进行着氮的生产与交换。草地牧草氮被家畜食入之后,未被吸收利用的氮,通过粪、尿归还给土壤,只有沉积于畜体内的氮,才是草原生产中的有效氮。为了查明由牧草氮到畜体氮转移中的积累量和丢失量,有利于合理利用草地,我们对此进行了试验,现将试验结果总结如下。 Nitrogen is one of the important elements in the grassland ecosystem. From the pasture to the grassland animals - sheep - between the effective production and exchange of nitrogen. Grassland pasture nitrogen after being ingested by livestock, the nitrogen that has not been absorbed and utilized is returned to the soil through the excrement and urine, and only the nitrogen deposited in the livestock carcass is the effective nitrogen in the grassland production. In order to ascertain the accumulation and loss of nitrogen from the pasture nitrogen to the carcasses, which is beneficial to the rational use of the grasslands, we conducted experiments. The test results are summarized as follows.