Survey of Plant Diseases and Responses to Grazing in Natural Grassland of Gannan
Plant disease is a key factor limiting grassland productivity and product quality.This study investigated the types,distribution,and damage of plant diseases over two consecutive growing seasons from 2020 to 2021 in the natural grassland of Gannan Tibetan Autonomous Prefecture,Gansu Province,by random sampling method.The response of major diseases to grazing utilization was also explored.The results identified a total of 54 plant diseases in Gannan,involving 49 plant species from 14 families and 42 genera.Notably,species from the Poaceae,Asteraceae,Ranunculaceae,and Cyperaceae families were affected by plant diseases the most,accounting for 55.56%of the total diseases investigated.Disease types and severity varied across different survey points.Generally,July was recognized as the onset of the diseases.Disease occurrence and severity gradually increased from August to September and reached their peaks in September,with the incidence of major diseases exceeding 95%and the disease index surpassing 55.At Azi Experiment Station,the utilization methods of livestock grazing affect the occurrence of various grassland plant diseases.However,the response of the disease occurrence patterns of different plants to the same livestock grazing utilization method varies.In conclusion,the occurrence of diseases in the natural grasslands of Gannan is relatively severe,and grazing and enclosure treatments can alleviate the occurrence of diseases.This research provides theoretical guidance for the subsequent scientific research and the devel-opment of disease management work in the natural grasslands of Gannan.
NETL
NSTL
万方数据
