BAI Lushun,FAN Maopan,WANG Zilin,et al.Relationship Between Root Characteristics and Aggregate stability in the Field With Maize and Soybean Intercropping[J].Research of Soil and Water Conservation,2019,26(01):124-129.
间作模式下玉米/大豆的根系特征及其与团聚体稳定性的关系
- Title:
- Relationship Between Root Characteristics and Aggregate stability in the Field With Maize and Soybean Intercropping
- Keywords:
- slope farmland; intercropping; root characteristics; aggregate stability; fractal dimension
- 分类号:
- S157.4+31
- 摘要:
- 通过玉米单作、大豆单作和玉米大豆间作种植，利用WINRHIZ软件分析不同种植模式下0-10 cm，10-20 cm，20-30 cm不同深度土层的作物根系的根系密度、根长、根表面积等根系特征指标，并采用湿筛法对各个土层团聚体稳定性进行分析，研究根系特征对团聚体稳定性的影响。结果表明：单间作条件下，玉米和大豆的根系密度、根长、根表面积、根长密度、根体积等随着土层深度的增加而减少，间作模式下根系密度、根体积在0-10 cm土层分别比单作增加了14.79%和11.74%。间作模式下各土层团聚体平均重量直径和平均几何直径显著高于单作模式，团聚体破坏率、可蚀性因子K值、分形维数（D）显著小于单作模式，0-10 cm土层差异表现为极显著，充分说明间作模式下团聚稳定性优于单作模式。且以上指标在0-10 cm土层内差异最显著，随土层深度增加差异呈减小趋势；通过相关性分析，团聚体破坏率与根体积，根尖数呈显著负相关，与根长，根表面积，根长密度，根杈数极显著相关，说明根长、根长密度、根表面积和根杈对提高团聚体稳定性具有一定作用。因此，间作模式可通过增大根表面积、根长等改变根系特征，从而提高土壤团聚体稳定性。
- Abstract:
- The field experiment with three planting patterns, including maize monoculture, soybean monoculture, and maize and soybean intercropping, was carried out to study the effects of crop root on soil aggregate stability. Root density, root length, root surface area and other root characteristics in 0-10 cm, 10-20 cm and 20-30 cm soil layers were analyzed under different planting patterns by WINRHIZO. The stability of soil aggregates in each soil layer was analyzed by wet sieve method. The results showed that the root characteristic indexes of all three planting patterns decreased with the increase of soil depth; in 0-10 cm soil layer, the root density and root volume of intercropping were 14.79% and 11.74% higher than those of monocultures, respectively;mean weight diameter (MWD) and geometric diameter (GMD) in each soil layer were higher in intercropping pattern than those in monocultures, while percentage of aggregate destruction (PAD), soil erodibility (K), fractal dimension (D) werelower, especially in 0-10 cm, indicating that structure soil aggregates were more stale in intercropping pattern; the correlation analysis showed that PAD was significantly negatively correlated with root volume and root tip numbers, extremely significantly correlated with root length, root surface area, root length density, and root branch number. These results indicated that root length, root length density, root surface area and root branch number may improve soil aggregate stability. It is concluded that intercropping can significantly improve the root surface area, root length and so on, and thus improve the stability of soil aggregates.
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备注/Memo
收稿日期:2018-3-15;改回日期:2018-4-12。
基金项目:国家自然科学基金（41461059，41661063）
作者简介:白录顺(1992-),男,河北省沧州人,硕士,主要从事坡耕地水土保持研究。E-mail:1427279581@qq.com
通讯作者:李永梅(1966-),女,河南新乡人,博士,教授,主要从事坡耕地水土保持与持续利用研究。E-mail:youngmaylee@126.com