水土保持通报2025，Vol.45Issue(4)：29-39,11.DOI:10.13961/j.cnki.stbctb.2025.04.022
生草覆盖对经果林土壤团聚体稳定性的影响
Effects of grass cover on stability of soil aggregates in economic fruit forests
摘要
Abstract
[Objective]The effects of different grass coverage on the stability of soil aggregates in economic fruit forests were explored to reveal the responses of soil properties and aggregates to grass cover in these forest forests and their coordinated regulation mechanisms.[Methods]Soils of economic fruit forests with Vicia villosa(T1),Raphanus sativus(T2),R.sativus(T3),and mixed sowing of V.villosa,R.sativus,and Paspalum wettsteinii(T4),were analyzed using the wet sieving and Le Bissonnais methods to assess the effects of grass mulching on the stability of soil aggregates.[Results]① Under the wet sieving treatment,grass mulching significantly increased the content of water-stable macroaggregates(>0.25 mm),with T3(83.47%)>T1(82.20%)>T4(79.98%)>T2(76.75%)>control(CK;74.30%),showing notable increases.Additionally,both the mean weight and geometric mean diameters were significantly higher in the grass-mulched treatments compared to those with clearing tillage.② Under the Le Bissonnais method,fast wetting(FW)caused the greatest disintegration of aggregates larger than 2 mm,whereas slow wetting(SW)had the least destructive effect,with the percentage of aggregates smaller than 0.25 mm ranging from 15.02%to 23.81%.The highest increase in stability indices was observed with pre-wetting followed by disturbance(WS).The aggregate stability followed the order:SW>WS>FW.Significant differences were observed between relative slaking index(RSI)and relative mechanical index(RMI),with RSI being greater than RMI.Among the treatments,the T2 treatment had the smallest RSI value,whereas the T3 treatment had the smallest RMI value.③ The mean soil fractal dimension values under dry and wet sieving treatments were 1.89 and 2.46,respectively.Significant differences were observed in fractal dimension(D),structural damage rate(PAD),and unstable aggregates index(ELT)across different raw herbaceous treatments.The PAD value of the T1 treatment was reduced by 16.25%compared with that of the CK,and all the treatments of T1—T4 significantly reduced the ELT value.Correlation and pathway analyses indicated that the stability of soil aggregates was affected by total porosity,capillary porosity,bulk weight,soil organic carbon,and mechanical composition,among which soil organic carbon was the key factor.[Conclusion]Grass mulching significantly enhanced the stability of soil aggregates and optimized soil structure in an economic fruit forest by attenuating the dissipative damage caused by heavy rainfall or irrigation on aggregates.Among these,two grass mulching treatments,R.sativus and R.sativus,showed significant advantages in practice.关键词
Le Bissonnais法/水稳性团聚体/生草覆盖/团聚体稳定性Key words
Le Bissonnais method/water-stable aggregates/grass cover/aggregates stability分类
农业科技引用本文复制引用
闫桂菀,邓羽松,何铁光,董文斌,韦彩会,张宇亭,俞月凤,梁海,李忠义,唐红琴,莫永诚..生草覆盖对经果林土壤团聚体稳定性的影响[J].水土保持通报,2025,45(4):29-39,11.基金项目
国家绿肥产业技术体系建设项目(CARS-22) （CARS-22）
国家重点研发计划子课题"喀斯特坡耕地水土流失生态阻控关键技术"(2023YFD1902801) （2023YFD1902801）
科技先锋队"强农富民""6个一"专项行动(桂农科盟202413) （桂农科盟202413）
