In order to select the right sand hedge in Chifeng,Inner Mongolia,Salix gordejevii Y.L.Chang and Hedysarum fruticosum vat.mongolicum (Turcz.) were established in sand hedges of S.gordejevii,Salix-Hedysarum and H.fruticosum var.mongolicum,performances on vegetation coverage,sand dune shift distance,input-output ratio were monitored for 5 a.The results showed that average vegetation coverages for S.gordejevii sand hedges,Salix-Hedysarum sand hedges and H.fruticosum vat.mongolicum sand hedges were 44.9％,80.7％,79.7％ in the 5th year.Within 3 a after establishment,sand dunes were basically fixed since the 2nd year except for shifts of 0.54,0.51,0.50 m in the 1st year for 3 hedges,respectively.Cuttings for 3 hedge establishments were 7 000,6 400,6 000 kg · hm-2,respectively.Yields of seeds (except S.gordejevii) and cuttings were satisfactory,with overall yield of seeds and cuttings being 0,174.5,203.3 kg·hm-2,62 350,62 870,62 650 kg·hm-2 in the 5th year.Input-output ratio decreased with time,and the outputs exceeded the inputs since the 3rd year.Ratios of input to overall outputs for 5 a and the ratio of input to average output for 5 a were 0.20,0.15,0.14,1.02,0.76,0.71 respectively.To summarize,H.fruticosum var.mongolicum is the optimum species for sand hedge,followed by Salix-Hedysarum and S.gordejevii sand hedges in a descending order.
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维普
万方数据
