河北行唐大枣品质与成土母岩类型关系的探讨

Relationship between types of soil parent rock and Chinese date quality in Xingtang, Hebei

笔者从农业地质研究的角度出发,探讨了成土母岩对行唐大枣产量和品质的影响。调查研究发现在行唐山区品质好、产量高的大枣主要分布在黑云斜长片麻岩区,其主要原因是黑云斜长片麻岩较其他类型风化层厚,裂隙发育,P、Sr、稀土元素等含量高,K含量高并以缓效态赋存在黑云母中易被植物吸收;从土壤地球化学背景分析表明,优质大枣分布区具有与P、Sr、Na和稀土元素总量的富集区吻合性最好,Ni、Cr含量低的特点,这也验证了行唐大枣优质产区分布和成土母岩黑云斜长片麻岩分布的一致性。

The paper discusses the influence of soil parent rocks on the output and quality of Chinese date in the agrogeological context. Investigation shows that Chinese dates with a good quality and a high output in the Xingtang mountainous area, Hebei, are mostly distributed in the biotite-plagioclase gneiss area. It is mainly because, in comparison with other types of mantle rock, biotite-plagioclase gneiss is thick with well-developed cracks and contains higher P, Sr and ∑ REE and its contained K is higher and occurs in the slow-effect state in biotite and thus is easily absorbed by plants. Analysis of the soil geochemical background, the area of good-quality Chinese date best coincides with the area rich in P, Sr, Na and ∑ REE, while Ni and Cr are lower. It also validates the consistency of the areas of Chinese date with the areas of its soil parent rock-biotite-plagioclase gneiss.