胡桃楸与落叶松人工混交林土壤化学性质的研究

STUDY ON CHEMICAL PROPERTY OF SOIL IN THE MIXED PLANTATION OF IARIX GMELINI AND JUGLANS MANDSHURICA

对东北东部山区３３年生落叶松纯林与胡桃楸、落叶松混交林下土壤的化学因子进行了外业调查与室内分析。结果表明，除Ｋ素外，有机质、全量Ｎ、水解性Ｎ，混交林各层次的含量都较纯林高，且底层差异较上层明显。阳离子代换量和微量元素含量，混交林比纯林也有很大提高。在诸化学因子中，对混交林土壤起主导作用的是全量Ｎ、盐浸ｐＨ值和速效Ｐ；对纯林土壤起主导作用的是全量Ｎ、水解性Ｎ和有机质。

The chemical factors of soil in 33 years old Larix gmelini pure forests and Larix gmelini and Juglans manshurica mixd forests in the east mountain areas of northeast China were surveyed and analysed. The results show that organic substances, total-N, Hydrolytic-N of all layers in mixed forests are higher than that in pure forests except element K, and the difference in lower layer is more obvious than that in upper layer. The concentrations of canon hypallge and microelement of mixed forests improve a lot than that of pure forests. Among all the chemical factors having important influence on the soil of mixed forests are total-N, pH value and available-p, on the soil of pure forests are total-N,hydrolytic-N and organic substances.