【摘要】：植被恢復(fù)是防治崩崗侵蝕的重要方法,為研究植物根系對崩崗洪積扇土壤水分狀況的影響,以崩崗洪積扇上種植的深根系巨菌草和淺根系寬葉雀稗為研究對象,對其分層取樣后,用環(huán)刀法測定土壤的密度、孔隙度和最大持水量等物理性質(zhì),計算土壤蓄水能力,并用WinRHIZO根系分析系統(tǒng),測定根長和密度等參數(shù)。結(jié)果表明:巨菌草和寬葉雀稗的各根系特征指標(biāo),均隨土層深度的增加而減小,巨菌草各根系指標(biāo)均大于寬葉雀稗;有植被覆蓋下的土壤密度均小于裸地,植被覆蓋下土壤總孔隙度和毛管孔隙度均大于裸地,且隨土層深度的增加而減小;有植被根系的土壤飽和蓄水量和毛管蓄水量均比裸地高,且與裸地差異顯著;在土壤表層,寬葉雀稗增加土壤孔隙性和土壤保水能力大于巨菌草,而在土壤中深層,則巨菌草大于寬葉雀稗;根系改善土壤性質(zhì)的能力,主要取決于其根長密度和根系總表面積,直徑小于0.5 mm的根系是影響土壤水分的最主要因子。研究植物根系對改良土壤水分狀況的影響,以期為崩崗侵蝕防治中植被種類的篩選和推廣提供依據(jù)。
[Abstract]:Vegetation restoration is an important method for prevention and control of landfall erosion. In order to study the effect of plant roots on soil moisture status of alluvial fan, the deep root giant fungus grass and shallow root wide paspalum planted on avalanche alluvial fan were taken as research objects. After stratified sampling, the physical properties of soil, such as soil density, porosity and maximum water holding capacity, were measured by ring knife method, and the soil water storage capacity was calculated. The root length and density parameters were measured by WinRHIZO root analysis system. The results showed that the root characteristic indexes of giant fungus grass and paspalum broad decreased with the increase of soil depth, and the root indexes of giant fungus grass were higher than that of wide paspalum. The density of soil under vegetation cover is lower than that of bare soil, and the total porosity and capillary porosity of soil under vegetation cover are higher than that of bare soil, and decrease with the increase of soil depth. The saturated water storage and capillary water storage of soil with vegetation root system were higher than that of bare soil, and the difference was significant compared with that of bare soil. In the soil surface layer, the soil porosity and water retention capacity of the broad-leaved barnyard was greater than that of the giant fungus grass, and in the deep layer of the soil, it was greater than the wide-leaved paspalum. The ability of root system to improve soil properties mainly depends on its root length density and root surface area. The root whose diameter is less than 0.5 mm is the most important factor affecting soil water content. The effects of plant roots on the improvement of soil moisture status were studied in order to provide the basis for the selection and popularization of vegetation species in the prevention and control of landfall erosion.
【作者單位】： 福建農(nóng)林大學(xué)資源與環(huán)境學(xué)院福建省土壤環(huán)境健康與調(diào)控重點實驗室;
【基金】：國家科技支撐計劃項目“中小型崩崗區(qū)的生態(tài)修復(fù)技術(shù)與示范”(2014BAD15B0303) 國家自然科學(xué)基金“花崗巖崩崗?fù)馏w膠結(jié)物質(zhì)與抗剪強度的關(guān)系研究”(41571272) 福建省自然科學(xué)基金“組合指紋法分析強度侵蝕小流域產(chǎn)沙與遷移規(guī)律”(2015J01156)
【分類號】：S157.43

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