Search results for: Guangmin Cao

Items from 1 to 20 out of 38 results

article

Response characteristics of grassland ecosystem biomass to grazing intensity in China

Yunying Wang, Weiwei Pei, Guangmin Cao, Xiaowei Guo, more

Grassland ecosystem functions are affected to a large extent by grazing activities. However, owing to the associated spatial heterogeneity, the influence of grazing intensity on grassland ecosystem biomass and the underlying mechanisms remains unclear. In this study, we analyzed data from 335 field data to clarify the response of grassland ecosystem biomass to grazing activities in China. We established...

article

Evaluation of actual evapotranspiration measured by large‐scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai‐Tibetan Plateau

Licong Dai, Ruiyu Fu, Xiaowei Guo, Xun Ke, more

Hydrological Processes > 35 > 4 > n/a - n/a

The accurate estimation of evapotranspiration (ET) is essential for assessing water availability and requirements of regional‐scale terrestrial ecosystems, and for understanding the hydrological cycle in alpine ecosystems. In this study, two large‐scale weighing lysimeters were employed to estimate the magnitude and dynamics of actual evapotranspiration in a humid alpine Kobresia meadow from January...

article

Effects of Increased Precipitation and Nitrogen Deposition on Methane Uptake of Alpine Meadow in Qinghai-Tibet Plateau : in situ Experiments

Xiaowei Guo, Licong Dail, Fawei Zhang, Yikang Li, more

Polish Journal of Ecology > 2020 > Vol. 68, nr 2 > 109--120

The methane (CH₄) fluxes in grasslands are sensitive to changes in precipitation and soil nitrogen concentrations, which was poorly understood, especially on the Tibetan Plateau. Therefore, an experiment was conducted from May 2012 to October 2013, by using the static chamber technique and gas chromatography method. We set up five treatments: an increased 2 g m^-2 NH₄NO₃ treatment (2gN); an increased...

article

Alpine grassland plants grow earlier and faster but biomass remains unchanged over 35 years of climate change

Hao Wang, Huiying Liu, Guangmin Cao, Zhiyuan Ma, more

Ecology Letters > 23 > 4 > 701 - 710

Satellite data indicate significant advancement in alpine spring phenology over decades of climate warming, but corresponding field evidence is scarce. It is also unknown whether this advancement results from an earlier shift of phenological events, or enhancement of plant growth under unchanged phenological pattern. By analyzing a 35‐year dataset of seasonal biomass dynamics of a Tibetan alpine grassland,...

article

Thirteen‐year variation in biomass allocation under climate change in an alpine Kobresia meadow, northern Qinghai–Tibetan Plateau

Licong Dai, Xiaowei Guo, Yangong Du, Xun Ke, more

Grass and Forage Science > 74 > 3 > 476 - 485

Alpine grassland ecosystems are thought to be the most sensitive ecosystems to climate change, yet the responses of their belowground biomass and potential climatic controls are poorly understood. Thirteen‐year (2004 ‐ 2016) time‐series of observational belowground biomass data and environmental factors were analysed in a humid alpine Kobresia meadow on the Northern Qinghai–Tibetan Plateau. Results...

article

Impacts of climate change and human factors on land cover change in inland mountain protected areas: a case study of the Qilian Mountain National Nature Reserve in China

Dawen Qian, Guangmin Cao, Yangong Du, Qian Li, more

Environmental Monitoring and Assessment > 2019 > 191 > 8 > 1-21

Over the past few decades, natural reserves have been affected by both climate change and human activities, and their land cover has changed dramatically, especially in mountain reserves, which are more sensitive to climate change and human activities. This paper used long-term Landsat and MODIS NDVI remote sensing data to monitor the changes of land cover and vegetation conditions in the Qilian Mountain...

article

Spatial distribution of grassland soil organic carbon and potential carbon storage on the Qinghai Plateau

Yangong Du, Geng Zhou, Xiaowei Guo, Guangmin Cao

Grassland Science > 65 > 3 > 141 - 146

Mapping the soil organic carbon (SOC) properties of terrestrial ecosystems is necessary to mitigate carbon flux. Here, we quantified grassland SOC contents and densities to evaluate the potential for increased storage through recovery on the Qinghai Plateau. The SOC contents of 41 paired soil profiles from areas of nondegraded and degraded grasslands were analyzed in 2012 using a dry oxidation method...

article

Shifts in priming partly explain impacts of long‐term nitrogen input in different chemical forms on soil organic carbon storage

Minghua Song, Yu Guo, Feihai Yu, Xianzhou Zhang, more

Global Change Biology > 24 > 9 > 4160 - 4172

Input of labile organic carbon can enhance decomposition of extant soil organic carbon (SOC) through priming. We hypothesized that long‐term nitrogen (N) input in different chemical forms alters SOC pools by altering priming effects associated with N‐mediated changes in plants and soil microbes. The hypothesis was tested by integrating field experimental data of plants, soil microbes and two incubation...

article

Experimentally simulating warmer and wetter climate additively improves rangeland quality on the Tibetan Plateau

Wei Xu, Mengyao Zhu, Zhenhua Zhang, Zhiyuan Ma, more

Journal of Applied Ecology > 55 > 3 > 1486 - 1497

The vast expanses of rangeland on the Tibetan Plateau, which support the livelihood of c. 9.8 million local inhabitants, have experienced rapid climate warming over the past 50 years. At the same time, precipitation has increased in large parts of the Plateau but decreased in other parts, particularly in the northwest. These trends are predicted to continue into the future. However, their potential...

article

Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai‐Tibetan Plateau

Fawei Zhang, Hongqin Li, Wenying Wang, Yikang Li, more

Ecohydrology > 11 > 2 > n/a - n/a

Accurately quantifying evapotranspiration (ET) is crucial to fully understanding regional water resource management and potential feedbacks to climate change in alpine grasslands. The quantitative relationships between ET and environmental controls were investigated by a continuous eddy covariance dataset from June 2014 to December 2016 over an alpine Kobresia meadow on the northeastern Qinghai‐Tibetan...

article

Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau

Yongfeng Fu, Chunyan Liu, Fei Lin, Xiaoxia Hu, more

Agriculture, Ecosystems & Environment > 2018 > 255 > C > 27-36

Alpine meadows are the largest grasslands in China. Greenhouse gas exchanges between alpine meadows and the atmosphere are highly uncertain due to the lack of year-round flux measurements. In this study, the methane (CH₄) and nitrous oxide (N₂O) fluxes in an alpine Potentilla fruticosa shrub meadow in the Qinghai-Tibetan Plateau were investigated using the static, opaque chamber-gas chromatography...

article

Changes of soil organic and inorganic carbon in relation to grassland degradation in Northern Tibet

Shuli Liu, Yanhong Tang, Fawei Zhang, Yangong Du, more

Ecological Research > 2017 > 32 > 3 > 395-404

The effect of livestock grazing on grassland degradation and the resulting impact on soil carbon concentration is an important factor in carbon estimation. We addressed this issue using field observations and laboratory analysis of samples from Tibetan grassland. Based on the field measurements, we investigated the soil organic carbon (SOC) and soil inorganic carbon (SIC) under two contrasting degradation...

article

Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland

Hao Wang, Lingfei Yu, Zhenhua Zhang, Wei Liu, more

Global Change Biology > 23 > 2 > 815 - 829

Rapid climate change and intensified human activities have resulted in water table lowering (WTL) and enhanced nitrogen (N) deposition in Tibetan alpine wetlands. These changes may alter the magnitude and direction of greenhouse gas (GHG) emissions, affecting the climate impact of these fragile ecosystems. We conducted a mesocosm experiment combined with a metagenomics approach (GeoChip 5.0) to elucidate...

article

Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China

Hongqin Li, Fawei Zhang, Yingnian Li, Junbang Wang, more

Agricultural and Forest Meteorology > 2016 > 228-229 > C > 95-103

Alpine ecosystems play an important role in the global carbon cycle, yet the long-term response of in situ ground-based observations of carbon fluxes to climate change remains not fully understood. Here, we analyzed the continuous net ecosystem CO₂ exchange (NEE) measured with the eddy covariance technique over an alpine Potentilla fruticosa shrubland on the northeastern Qinghai-Tibetan Plateau from...

article

Composition of the soil fungal community is more sensitive to phosphorus than nitrogen addition in the alpine meadow on the Qinghai-Tibetan Plateau

Dan He, Xingjia Xiang, Jin-Sheng He, Chao Wang, more

Biology and Fertility of Soils > 2016 > 52 > 8 > 1059-1072

The alpine meadow on the Qinghai-Tibetan Plateau (QTP), which is sensitive to global climate change and human activities, is subjected to addition of nutrients such as nitrogen (N) and phosphorus (P) in the soil. The impacts of N or P on ecosystem structure and function depend at least partly on the response of soil fungal communities, although few studies have compared the effects of N and P addition,...

article

Simulation and prediction of nitrous oxide emission by the water and nitrogen management model on the Tibetan plateau

Yangong Du, Xiaowei Guo, Guangmin Cao, Bin Wang, more

Biochemical Systematics and Ecology > 2016 > 65 > C > 49-56

Process-based simulation models have been used to assess the characteristics of N₂O emission and to examine the potential impacts of climate change in grassland ecosystems. Temporal N₂O fluxes from the soil–atmosphere interface were monitored in this study continuously for two years by using flux chamber measurements and were simulated by using the water and nitrogen management model (WNMM_NSWDPI...

article

Response of the plant community and soil water status to alpine Kobresia meadow degradation gradients on the Qinghai–Tibetan Plateau, China

Jing Li, Fawei Zhang, Li Lin, Hongqin Li, more

Ecological Research > 2015 > 30 > 4 > 589-596

Degradation of alpine Kobresia meadow in the Qinghai–Tibetan Plateau is a serious problem, but its effect on the plant community and soil water status is not fully understood. We chose four homogeneous sites with <20, 20–70, 70–90, and >90 % absolute abundance of palatable grasses, and classified them as degradation gradient categories of poor, fair, good, and excellent, respectively. The lowest...

article

Land use change decreases soil carbon stocks in Tibetan grasslands

Na Qiao, Xingliang Xu, Guangmin Cao, Hua Ouyang, more

Plant and Soil > 2015 > 395 > 1-2 > 231-241

Backgrounds and aims Land use is an important factor affecting soil organic carbon (SOC) dynamics and can produce positive C climate feedback, but its effects remain unknown for Tibetan ecosystems. Methods Recent land use changes have converted the traditional winter Kobresia pastures of nomads in the northeastern Tibetan Plateau to Elymus pastures or even to cropland. Detailed SOC measurements...

article

Seasonal changes of CO2, CH4 and N2O fluxes in different types of alpine grassland in the Qinghai-Tibetan Plateau of China

Yuanyuan Li, Shikui Dong, Shiliang Liu, Huakun Zhou, more

Soil Biology and Biochemistry > 2015 > 80 > C > 306-314

Grassland degradation and grassland use type changes are associated with dynamics in soil properties and biogeochemical cycling, with implications for carbon and nitrogen cycling and trace gas fluxes. To examine the influence of grassland degradation and grassland use type changes on gases fluxes, emissions of CO₂, CH₄ and N₂O were measured in three alpine ecosystems (alpine meadow, alpine steppe...

article

Nutrient limitation of alpine plants: Implications from leaf N : P stoichiometry and leaf δ¹⁵N

Xingliang Xu, Wolfgang Wanek, Caiping Zhou, Andreas Richter, more

Journal of Plant Nutrition and Soil Science > 177 > 3 > 378 - 387

Nitrogen (N) deposition can affect grassland ecosystems by altering biomass production, plant species composition and abundance. Therefore, a better understanding of the response of dominant plant species to N input is a prerequisite for accurate prediction of future changes and interactions within plant communities. We evaluated the response of seven dominant plant species on the Tibetan Plateau...

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INFONA - science communication portal

Search results for: Guangmin Cao

Response characteristics of grassland ecosystem biomass to grazing intensity in China

Evaluation of actual evapotranspiration measured by large‐scale weighing lysimeters in a humid alpine meadow, northeastern Qinghai‐Tibetan Plateau

Effects of Increased Precipitation and Nitrogen Deposition on Methane Uptake of Alpine Meadow in Qinghai-Tibet Plateau : in situ Experiments

Alpine grassland plants grow earlier and faster but biomass remains unchanged over 35 years of climate change

Thirteen‐year variation in biomass allocation under climate change in an alpine Kobresia meadow, northern Qinghai–Tibetan Plateau

Impacts of climate change and human factors on land cover change in inland mountain protected areas: a case study of the Qilian Mountain National Nature Reserve in China

Spatial distribution of grassland soil organic carbon and potential carbon storage on the Qinghai Plateau

Shifts in priming partly explain impacts of long‐term nitrogen input in different chemical forms on soil organic carbon storage

Experimentally simulating warmer and wetter climate additively improves rangeland quality on the Tibetan Plateau

Net radiation rather than surface moisture limits evapotranspiration over a humid alpine meadow on the northeastern Qinghai‐Tibetan Plateau

Quantification of year-round methane and nitrous oxide fluxes in a typical alpine shrub meadow on the Qinghai-Tibetan Plateau

Changes of soil organic and inorganic carbon in relation to grassland degradation in Northern Tibet

Molecular mechanisms of water table lowering and nitrogen deposition in affecting greenhouse gas emissions from a Tibetan alpine wetland

Seasonal and inter-annual variations in CO2 fluxes over 10 years in an alpine shrubland on the Qinghai-Tibetan Plateau, China

Composition of the soil fungal community is more sensitive to phosphorus than nitrogen addition in the alpine meadow on the Qinghai-Tibetan Plateau

Simulation and prediction of nitrous oxide emission by the water and nitrogen management model on the Tibetan plateau

Response of the plant community and soil water status to alpine Kobresia meadow degradation gradients on the Qinghai–Tibetan Plateau, China

Land use change decreases soil carbon stocks in Tibetan grasslands

Seasonal changes of CO2, CH4 and N2O fluxes in different types of alpine grassland in the Qinghai-Tibetan Plateau of China

Nutrient limitation of alpine plants: Implications from leaf N : P stoichiometry and leaf δ¹⁵N

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