Variability of soil carbon and nitrogen stocks after conversion of natural forest to plantations in Eastern China.

Forest plantation, either through afforestation or reforestation, has been suggested to reverse and mitigate the process of deforestation. However, uncertainties remain in the potential of plantation forest (PF) to sequestrate carbon (C) and nitrogen (N) compared to natural forest (NF). Soil C and N stocks require a critical and updated look at what is happening especially in the context of increasing rate of land use change and climate change.

Effects of land use change from natural forest to plantation on C, N and natural abundance of C and N along a climate gradient in eastern China.

Soil C and N turnover rates and contents are strongly influenced by climates (e.g., mean annual temperature MAT, and mean annual precipitation MAP) as well as human activities.

[Responses of seed germination and seedling growth of Cunninghamia lanceolata and Schima superba to different light intensities.].

Light is a key factor affecting seed germination and seedling growth. In this study, seed germination and seedling growth of Cunninghamia lanceolata and Schima superba were compared under controlled conditions with five light treatments (100%, 60%, 40%, 15% and 5% of full sunlight). The results showed that light intensity significantly impacted seed germination and seedling growth of both species.

[Response of seed germination and seedling growth of Chinese fir to different light intensities].

The effect of light intensity on the seed germination and seedling growth of Chinese fir under different light intensities (100%, 40%, 20%, 10%, 5% of full light, and the PPFD was 201.3, 77.0, 37.

An estimate on the rainout of atmospheric CO2.

The CO2 in the atmosphere is in contact with water vapor and rain droplets forming CO2 x H2O, HCO3- and CO3(2-) . Global precipitation is about 505 x 1015 kg/a. Based on theoretical calculation for unpolluted air and measurement observations, we estimated that 100-270 x 10(12) gC/a are scavenged from the air by global precipitation.