花岗岩红壤侵蚀退化地不同治理模式土壤抗蚀性评价

Evaluation of Soil Erosion Resistance Under Different Treatment Modes in Erosion Degraded Land of Granite Red Soil

为探究花岗岩红壤侵蚀退化地不同治理模式对土壤抗蚀性的影响,通过野外调查与室内外试验,以长汀县封禁(M1)、乔灌草混交(M2)、全坡面播草(M3)、低效林改造(M4)、条沟草灌带(M5)这5种治理模式的土壤为研究对象,选取开垦地(CK1)和裸露地(CK2)为对照,利用主成分分析法揭示土壤抗蚀性主要影响因子,并结合灰色关联分析和耦合分析对土壤抗蚀性进行综合评价。结果表明:(1)不同治理模式的土壤抗蚀性由强到弱依次为M5>M2>M3>M4>M1>CK2>CK1;(2)>0.25 mm水稳性团聚体含量和有机质含量是影响土壤抗蚀性的主要因子;(3)土壤抗蚀性与土壤理化性质的灰色关联度较高(0.696),M3的土壤抗蚀性与土壤理化性质之间系统耦合度最高(0.883)。研究结果为花岗岩红壤侵蚀退化地的水土流失治理及生态恢复提供科学依据。

To explore the effects of different treatment modes on soil erosion resistance in eroded degraded land of granite red soil,field investigation and laboratory experiment were conducted.Soil of five treatment modes in Changting county,including banned(M1),arbor-shrub-grass mixed forest(M2),whole slope grass sowing(M3),low efficiency forest transformation(M4)and the furrow grass shrub zone(M5),were taken as the research objects,clearage(CK1)and the bare land(CK2)were selected as the control.The main influencing factors of soil erosion resistance were revealed by principal component analysis,and the comprehensive evaluation of soil erosion resistance was carried out by combining grey correlation analysis and coupling analysis.The results showed that:(1)The order of soil erosion resistance under different treatment modes was M5>M2>M3>M4>M1>CK2>CK1.(2)The content of water-stable aggregate>0.25 mm and organic matter content were the main factors affected soil erosion resistance.(3)The soil erosion resistance index was strongly correlated with the soil physical and chemical properties(0.696),and the coupling degree between soil erosion resistance and soil physical and chemical properties of M3 was the highest(0.883).The results provide a scientific basis for soil and water loss control and ecological restoration in eroded degraded land of granite red soil areas.