Study On Reconstruction And Utilization Of Grassland For Grazing

This research took serious deteriorated grassland in Zhaosu horse farm as study object.To discuss the technology of reconstruction and reasonable utilization in order to plough andestablish pasture grassland completely. Through comparison between before and afterreconstruction as well as analysis on community features variation, this research screenedappropriate rebuilt group and defined the reconstructed technology, so as to measurecommunity quantity and quality dynamically of rebuilt grassland based on different pastureutilization aiming to reveal the change law, evaluate the utilization results comprehensively,determine appropriate grazing and utilization methods to rebuild grassland. Following up areresearch results:From the2years’ analysis results on community features of grassland rebuilt in autumn,it showed that all the indexes were higher than previous year except coverage, and better thangrassland which was not rebuilt. However, characteristic indexes of the rebuilt communityranked unstably. The highest ratio of coverage, height, density and output of community toleguminous forage output is B1, B10,B9, B6，B7，B8respectively. Optimal treatment toreconstruction in the two years is not stable. From the comprehensive assessment, B1has thebest rebuilt result, followed by B10, B7, B14.Because of different grazing intensity, community coverage descended along with theincrease of graze frequency. B6is the highest. Community regenerated height didn’t change alot comparing with first graze, B7is highest in stubble5cm and10cm, B6is the highest instubble8cm. Community density went up for the first three times, but descended graduallyfrom the fourth time. B11is the largest in stubble5cm and10cm, B13is the largest in stubble8cm. As for community output, the output of all treatments descended except B14which hadpeak-to-trough for first four times, output reduced along with the increase of graze,accumulative output of B7is the highest during the three grazing intensity. Each treatedleguminous pasture output ratio is higher than the first time, most of treatments descendedfrom the third time and reach minimum value in the fifth time. B8and B12is highestfollowed by B7in each graze. In the same mixed-sown condition, mixing two pastures issuperior to mixing4or6pastures. With decrease of grazing intensity, average coverage andheight of five treatments showed: stubble5cm<stubble8cm <stubble10cm. Average density,cumulative output and leguminous pasture ratio have different response upon three stubbleheight with unconspicuous differences, comparing with categories and quantity ofmixed-sown grass, it didn’t have obvious law.From comprehensive evaluation on grazing utilization grassland that is rebuilt, it showedthat B7is the best while B2is the worst when grazing intensity is stubble5cm. when grazingintensity is stubble8cm, B7is the best while B3is the worst. In stubble10cm, B7is the bestwhile B14is the worst. In the three grazing intensity,14mixed-sown treatments hadfollowing comprehensive evaluation results: Every group and stubble height of B7was in topthree, stubble10cm is optimal, following by stubble8cm and stubble5cm; these three groupswere optimal: B6in stubble10cm, B9in stubble8cm and B13in stubble10cm; B2in stubble5cm is the worst group. Due to cold climate in Zhaosu horse farm and condition of the rebuiltgrassland, appropriate reconstructive group and grazing utilization method were chosenpreliminarily: B7(red clover+tall fescue), grazing intensity should be stubble10cm.