祁连山区黑土滩人工草地对春季模拟放牧的响应

该研究于2018年牧草返青期以刈割模拟家畜采食行为,对祁连山区黑土滩人工草地进行了放牧强度(刈割率)为0、30%、50%、70%、90%的5级模拟放牧试验研究。结果表明,春季休牧(未刈割)和放牧强度(刈割率)为30%时,对黑土滩人工草地垂穗披碱草的后期生长发育没有影响,而随着放牧强度(刈割率)加大,垂穗披碱草的后期生长发育将会受到严重制约,当放牧强度(刈割率)达到90%时,垂穗披碱草的盖度、高度、牧草产量和种子产量分别较休牧降低了41.0%、73.0%、87.4%和88.9%,研究结果认为返青期过度放牧利用会引起黑土滩人工草地的快速退化。

Response of black soil land artificial grassland to simulated grazing in spring in Qilian mountains area

In this study,the grazing intensity(mowing rate)was 0,30%,50%,70%and 90%on the artificial grassland in the black soil land of Qilian mountains area were simulated by cutting to simulate the grazing behavior of livestock in 2018.The results showed that the non-spring grazing(un-mowing)and grazing intensity(mowing rate)were 30%,there was no effect on the late growth and development of ElymusnutansGriseb in the black soil land,but with the grazing intensity(mowing rate)increased,development of ElymusnutansGriseb will be severely restricted.in late the growth While the grazing intensity(mowing rate)was 90%,compared with non-grazing,the coverage,plant height,forage biomass and seed yield of ElymusnutansGriseb reduced by 41.0%,73.0%,87.4%and 88.9%.The results showed that excessive grazing utilization at returning green stage will cause rapid degradation of black soil land artificial grassland.