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以川南天然林(TRL)及其转变成的毛竹林(MZL)、檫木林(CML)、柳杉林(LSL)、杉木林(SML)和水杉林(SSL)为对象,研究不同林分土壤物理性质和抗蚀性差异,以主成分分析法(ZCFM)和隶属函数法(LSHM)分别计算的土壤抗蚀性综合值Ⅰ(KSX-Ⅰ)和Ⅱ(KSX-Ⅱ)评价林分变化对土壤抗蚀性的影响,探索简便易行的土壤抗蚀性综合评价方法。结果表明,天然林转变为人工林后土壤物理性质和抗蚀性变差,呈现出有机质和>0.25 mm水稳性团聚体含量、水稳性团聚体平均重量直径、团聚度、孔隙度及物理稳定性指数降低,而结构体破坏率、不稳定团粒指数、容重、分散率及侵蚀系数增加。各林分土壤KSX-Ⅰ和KSX-Ⅱ均呈现出TRL>CML>SSL>LSL>MZL>SML的规律变化。土壤抗蚀性指标间相关性均达到显著(p<0.05)水平;土壤KSX-Ⅰ和KSX-Ⅱ之间呈显著相关关系(p<0.05),且两者均与各抗蚀性指标间呈显著相关(p<0.05)。说明天然林植被变化后会使土壤抗蚀性降低,影响原有植被水土保持功能,应该加强天然林及其生态功能保护;ZCFM和LSHM均可作为计算土壤抗蚀性综合值的有效方法,但考虑到计算过程的难易度,后者更简便易行。结果为土壤抗蚀性综合评价新方法的建立提供了参考。
In order to study the effects of TRL and MZL, CML, LSL, SML and SSL on soil physical properties of different stands (KSX-Ⅰ) and Ⅱ (KSX-Ⅱ) calculated by principal component analysis (ZCFM) and membership function (LSHM) Corrosion resistance, explore the simple and easy method of comprehensive evaluation of soil corrosion resistance. The results showed that the physical properties and corrosion resistance of natural forest changed to plantation, showing the content of organic matter and> 0.25 mm water-stable aggregates, the average weight diameter of water-stable aggregates, agglomeration, porosity and physical The stability index decreased, while the structural failure rate, unstable aggregate index, bulk density, dispersion rate and erosion coefficient increased. Soil KSX-I and KSX-II showed the regular changes of TRL> CML> SSL> LSL> MZL> SML. There was a significant correlation (p <0.05) between soil erosion resistance index and soil KSX-Ⅰ and KSX-Ⅱ (p <0.05), and the correlations between soil erosion resistance index and soil KSX- Significantly correlated (p <0.05). The results show that the change of natural forest vegetation will reduce the soil erosion resistance and affect the original soil and water conservation function, and should strengthen the protection of natural forest and its ecological function. Both ZCFM and LSHM can be used as effective methods to calculate the total soil erosion resistance, Taking into account the difficulty of the calculation process, the latter more simple and easy. The results provide a reference for the establishment of a new method for comprehensive evaluation of soil erosion resistance.