滩羊尿对典型草原三种草地植物生长的短期作用特性

研究了不同尿液浓度和土壤含水量下，羊尿对典型草原植物茵陈蒿、委陵菜和狗尾草生长的短期作用特性。结果表明，不同施尿量施尿后1个月，狗尾草对羊尿沉积的响应为高尿液浓度负效应，低尿液浓度正效应；茵陈蒿和委陵菜为负效应。土壤含水量越高，羊尿对其分蘖（枝）的负效应越低。不同尿液浓度下，三种植物对羊尿响应的负效应顺序为茵陈蒿〉委陵菜〉狗尾草；且其分蘖（枝）对羊尿和土壤水分互作反应的正效应顺序为狗尾草〉委陵菜〉茵陈蒿。具体放牧过程中，可通过家畜适时饮水降低尿液浓度，以降低畜尿对草地的负效应。

The Shorter-term Effect Characteristics of Tan-sheep Urine on Growth of Three Plants in Steppe Grassland

The shorter-term effects of Tan-sheep urine on growth of three species in steppe grassland,under different urine concentrations and soil water contents were researched.The results showed that applying 4L sheep urine/m2,the response of Setaria viridis to sheep urine deposition after one month of sheep urine application was a negative and positive effect in higher and lower sheep urine concentrations conditions,respectively;while the response of Artemisia capillaries and Potentilla bifurca to sheep urine deposition was a negative effect.The negative effects of sheep urine deposition on the three species growing decreased with urine concentration decreased or soil water content increased.The response negative effective order of the three species to Tan-sheep urine deposition,under different urine concentrations,was A.capillaries > P.bifurca > S.viridis;while the response positive effective order of the three species to the interaction of sheep urine deposition and soil water treatments was A.capillaries < P.bifurca < S.viridis.So,under grazing practical procession,decreasing urine concentration by grazing animal drinking water timely could reduce animal urine negative effects on grassland,which would be an effective way of grassland management.