This paper made a dynamic study of the seasonal variation of nutrient elements in the fine roots and soil from Alnus cremastogyme Burk plantations,and of the relationship between them.

Carbon storage and its allocation in mixed alder-cypress plantations at different age stages;

Water conversation function of the mixed Alnus cremastogyne and Cupressus funebris stand ecosystem at different stand age;

Short-term effects of tending on the undergrowth diversity of Platycladus orientalis plantations in Beijing mountainous areas;

Based on 2×2 contingency table,this paper conducts some analyses of the inter-specific association between dominant tree populations of Platycladus orientalis plantations growing in Xuzhou City,by employing some indices such as collectivity variance ration,association coefficient value and percentage co-occurrence value and χ2-test.

Soil respiration rate (SRR) of Platycladus Orientalis plantation as well as soil temperature and volumetric soil moisture were measured by an automatic, open chamber technique using infrared gas analysis in the hilly region of North-China during 2006, the soil temperature and moisture were measured by an automatic monitoring system.

Changes of species composition and diversity in different age-classes of undergrowth vegetations in Cupressus funebris plantations in Yichang suburb;