微循环对村镇断头河道水土保持特性的影响

Effect of microcirculation on soil and water conservation characteristics of broken channels in villages and towns

以常州武进洛阳镇徐家头浜作为研究对象,调查微循环前后河道岸坡性状的变化情况,分析微循环下的河道生态系统抗冲击性能,并探讨岸坡生态系统抗冲击性能与其稳定性的关系。结果表明:(1)微循环过程中岸坡土壤质地、孔隙率及含水率变化均较小,但总磷(TP)、全氮(AN)、容重、抗蚀性均有较大变化;(2)微循环过程中河道雨后浮游生物较雨前均呈增长趋势,岸坡区域浮游生物数量明显高于河道中线区域,且微循环对河道岸坡微生物菌群抗降雨冲击具有促进作用;(3)岸坡土壤TP、AN及含水率对河道岸坡土壤微生物群落多样性的变化影响均达到显著水平(P <0.05)。研究显示,微循环能够提高河道岸坡生态系统抗冲击性能,对村镇断头河道水土保持意义重大。

Taking Xujiatou River in Luoyang Town,Wujin District,Changzhou City as a research object,the variation of river bank slope characteristics before and after microcirculation was investigated,the impact resistance of river ecosystem under microcirculation was analyzed,and the relationship between the impact resistance and stability of river bank slope ecosystem was discussed. The results showed that:(1)The changes of soil texture,porosity and water content were small in the microcirculation process,but the changes of total phosphorus( TP),total nitrogen( AN),bulk density and corrosion resistance were great.(2)In the process of microcirculation,the plankton in the river after rain showed an increasing trend compared with that before rain,and the number of plankton in the bank slope area was significantly higher than that in the middle line area of the river,and microcirculation had a promoting effect on the rainfall resistance of microbial flora in the river bank slope.(3)The effects of soil TP,AN and water content on soil microbial community diversity of riverbank slope were significant( P < 0. 05). The research showed that microcirculation could improve the impact resistance of river bank slope ecosystem,which was of great significance to soil and water conservation of broken channels in villages and towns.