[Response of root dynamics to nitrogen addition and the influencing factors in a Tibetan alpine steppe, China].

A field manipulative experiment was carried out during 2015 and 2016 to examine the changes and influencing factors of root production, turnover rate, and standing crop under different nitrogen (N) addition levels, ., 0, 1, 2, 4, 8 and 16 g N·m·a, in a Tibetan alpine steppe. The results showed that root production and standing crop decreased linearly or exponentially with increasing N addition rates.

Distinct microbial communities in the active and permafrost layers on the Tibetan Plateau.

Permafrost represents an important understudied genetic resource. Soil microorganisms play important roles in regulating biogeochemical cycles and maintaining ecosystem function. However, our knowledge of patterns and drivers of permafrost microbial communities is limited over broad geographic scales.

[Survey on intestinal nematode infections among school students in Tengchong County].

One primary school and one middle school were selected from Gudong Town, Tengyue Town and Puchuan Township of Tengchong County, respectively, by using the lamination stochastic group sampling method. The intestinal parasite infections were investigated with the iodine-stained direct smear method and modified Kato-Katz thick smears method. A total of 1 134 students were investigated and the total infection rate of intestinal nematodes was 12.

Biomass carbon stocks and their changes in northern China's grasslands during 1982-2006.

Grassland covers approximately one-third of the area of China and plays an important role in the global terrestrial carbon (C) cycle. However, little is known about biomass C stocks and dynamics in these grasslands. During 2001-2005, we conducted five consecutive field sampling campaigns to investigate above-and below-ground biomass for northern China's grasslands.

Ecosystem carbon stocks and their changes in China's grasslands.

The knowledge of carbon (C) stock and its dynamics is crucial for understanding the role of grassland ecosystems in China's terrestrial C cycle. To date, a comprehensive assessment on C balance in China's grasslands is still lacking. By reviewing published literature, this study aims to evaluate ecosystem C stocks (both vegetation biomass and soil organic C) and their changes in China's grasslands.

Above- and belowground biomass in relation to environmental factors in temperate grasslands, Inner Mongolia.

Above- and belowground biomasses of grasslands are important parameters for characterizing regional and global carbon cycles in grassland ecosystems. Compared with the relatively detailed information for aboveground biomass (AGB), belowground biomass (BGB) is poorly reported at the regional scales. The present study, based on a total of 113 sampling sites in temperate grassland of the Inner Mongolia, investigated regional distribution patterns of AGB, BGB, vertical distribution of roots, and their relationships with environmental factors.