间作五指毛桃土壤和根主要中微量元素含量及其相关性

为了解在成龄胶园间作的五指毛桃根际与非根际土壤及其根中主要中、微量元素含量情况，测定了实验区根际与非根际土壤各30个和对应五指毛桃根的钙、镁、铁、锰、铜和锌含量，分析了两者之间的关系，并评价了根际与非根际土壤中、微量元素丰缺状况。结果表明，非根际土壤钙、镁、铁、锰含量的平均值都高于根际土壤的，而铜、锌含量的平均值都低于根际土壤的。土壤钙、镁含量80%以上处于缺水平，而铁、锰含量处于丰或很丰水平，铜和锌含量处于适中水平。五指毛桃根际与非根际土壤中、微量元素存在空间上的广泛变异。五指毛桃根中、微量元素的平均值从大到小的排序是钙>镁>锰>铁>锌>铜。土壤中、微量元素与五指毛桃根中相对应的中、微量元素的相关性不强，且表现复杂。本研究结果揭示，在成龄胶园间作五指毛桃应当适量施用钙肥、镁肥和喷施一些铜元素叶面肥，并实行科学施肥，减少养分淋失。

Contents and Correlation of Main Medium and Micro Elements in Roots and Soils of Intercropped Ficus hirta Vahl. In Rubber Plantation

The contents, correlations and abundance or deficiency levels of medium elements (Ca and Mg) and micro elements (Fe, Mn, Cu and Zn) were determined and estimated for 30 samples of the roots, rhizosphere and non-rhizosphere soils of Ficus hirta Vahl. intercropped in rubber plantation. The results showed that the average contents of Ca, Mg, Fe and Mn were lower in rhizosphere soils than non-rhizosphere soils , while the average contents of Cu and Zn were higher in rhizosphere soils than in non-rhizospheresoil. 80% of soil samples (rhizosphere and non-rhizosphere) were deficient in Ca and Mg, while Fe and Mn contents were plentiful or very plentiful, Cu and Zn contents were moderate in all soil samples (rhizosphere and non-rhizosphere). There were wide spatial variations of medium and micro elements in rhizosphere and non-rhizosphere soils of Ficus hirta Vahl. The average contents of medium and micro elements in the roots of Ficus hirta Vahl. were in order of Ca > Mg > Mn > Fe > Zn > Cu. Significant positive correlations were found only between the contents of Mg and Mn in the roots of Ficus hirta Vahl. and in non-rhizosphere soils. The results of this study indicated that the Ca and Mg fertilizers and Cu leaf fertilizer should be applied properly and reasonably for the intercropped ficus hirta Vahl. while nutrient loss should be cared.