Study on improvement effect of different concentrations of wetting agentson alpine meadow rodent-damaged bald land
[Objective]Soil water repellency is an important factor limiting vegetation restoration in bare land. Reducing soil water repellency and increasing soil water holding capacity are key measures foreffective vegetation res-toration[Method]A typical bald spot in Luqu County,eastern Qinghai-Tibet Plateau,was selected for the study. Wetting agents with concentrations of 100 mL/m3,200 mL/m3,300 mL/m3 and 450 mL/m3 were applied. An un-treated bald spot served as the control (CK). The study compared and analyzed the soil physical properties and plant community characteristics between the treated and control areas. Correlation analysis was used to explore the effects of soil factors on plant community characteristics,and the grey correlation analysis method evaluated the improve-ment effect.[Result](1) After spraying different concentrations of wetting agents,the soil maximum water holding capacity(MC),capillary porosity(CP) and total porosity(TP) were significantly higher than those in the control (P<0.05),with no significant differences among the different concentrations(P>0.05).(2) In the area treatedwith 200 mL/m3 concentration ofwetting agent,the richness of perennial forbs was significantly higher compared to other concentration treatments and CK(P<0.05).(3) The soil maximum water holding capacity(MC) and capillary wa-ter holding capacity(CC) were significantly correlated with plant height(ht)(P<0.05).[Conclusion]Spraying wet-ting agent on bald spot can improve soil water holding capacity and increase plant species richness.A concentration of 200 ml/m3 is identified as the most effective for these improvements.
万方数据
维普
