Publications by authors named "Yan-gui Su"
Microbial carbon use efficiency (CUE) refers to the C transformation to microbial biomass from C uptake. The study of soil microbial CUE is very important for understanding the soil C cycle. Here, CUE, , and were measured using the O-HO-DNA labeling method at six elevational sites (980-1765 m) in Daiyun Mountain, a subtropical montane forest, to understand the variation characteristics and influencing mechanisms.
View Article and Find Full Text PDF[Effects of exogenous nitrogen addition on litter decomposition and nutrient release in a temperate desert].
Ying Yong Sheng Tai Xue Bao
November 2020
Article Synopsis
- A decomposition experiment was conducted in the southern Gurbantunggut Desert to investigate how adding nitrogen affects the breakdown of various litter types over 345 days.
- Different nitrogen treatments (0, 5, 10, and 20 g N·m·a) showed varying decomposition rates, with no significant improvement in rates due to nitrogen addition.
- The study found that while litter decomposition occurred and nutrients were released, nitrogen addition inhibited the release of nitrogen and phosphorus from certain litter types, suggesting it could slow nutrient recycling in desert ecosystems.
Biocrusts are common biotic components in dryland ecosystems worldwide, they contain diverse soil organisms and effectively enhance soil stability and perform a series of key ecological functions. However, the geographical pattern of microbial communities in biocrusts is rarely assessed, despite it is closely related to the spatial variation of ecosystem functions in drylands. We assessed soil bacterial communities in biocrusts across four ecosystems (Gobi, desert, desert steppe and grassland) in a precipitation gradient (16-566 mm yr) in northern China.
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- A pot experiment was conducted to analyze how various concentrations of nickel (Ni) and copper (Cu) affect the growth and photosynthesis of Peganum harmala seedlings.
- Increasing Ni levels led to a significant decline in growth parameters and photosynthetic metrics, mainly due to non-stomatal limitations, while CO2 concentration and non-photochemical quenching increased.
- For Cu, the seedlings showed optimal growth and photosynthesis at 50 mg kg(-1), with a gradual decline in performance at higher concentrations, primarily caused by stomatal limitations.
[Effects of elevated temperature and CO2 on desert algal crust photosynthesis].
Ying Yong Sheng Tai Xue Bao
September 2010
Article Synopsis
- The study focused on the effects of artificial and natural vegetation on the net photosynthetic rate (Pn) of algal crusts in the Shapotou region of the Tengger Desert by comparing different vegetation ages and conditions.
- Results showed that the 51-year-old artificial vegetation area had the highest Pn rate of 4.4 micromol x m(-2) x s(-1), while water content significantly impacted Pn, peaking at medium levels (40%-60%).
- When atmospheric CO2 concentration was doubled, Pn increased significantly at medium and high water levels, and higher temperatures (24°C and 28°C) also enhanced Pn at these water levels, while low water
[Soil moisture dynamics of artificial Caragana microphylla shrubs at different topographical sites in Horqin sandy land].
Ying Yong Sheng Tai Xue Bao
March 2009
Based on the investigation data of vegetation and soil moisture regime of Caragana microphylla shrubs widely distributed in Horqin sandy land, the spatiotemporal variations of soil moisture regime and soil water storage of artificial sand-fixing C. microphylla shrubs at different topographical sites in the sandy land were studied, and the evapotranspiration was measured by water balance method. The results showed that the soil moisture content of the shrubs was the highest in the lowland of dunes, followed by in the middle, and in the crest of the dunes, and increased with increasing depth.
View Article and Find Full Text PDF[Effects of moss crust on soil seed bank at southeast edge of Tengger Desert].
Ying Yong Sheng Tai Xue Bao
March 2007
An investigation was made on the soil seed bank at southeast edge of Tengger Desert with moss crust under natural and artificial vegetations. The results showed that the density of soil seed bank increased with the development of moss crust, which was 3.4 times higher under natural vegetation than under 24 years old artificial vegetation.
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