Effects of warming on carbon and nitrogen cycling in alpine grassland ecosystems on the Tibetan Plateau: A meta-analysis

Geoderma ◽  
2020 ◽  
Vol 370 ◽  
pp. 114363
Author(s):  
Ying Chen ◽  
Jiguang Feng ◽  
Xia Yuan ◽  
Biao Zhu
Keyword(s):  
Tibetan Plateau ◽  
Nitrogen Cycling ◽  
Meta Analysis ◽  
Alpine Grassland ◽  
The Tibetan Plateau ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Grassland Ecosystems

scholarly journals Grazing intensity significantly affects belowground carbon and nitrogen cycling in grassland ecosystems: a meta-analysis

2016 ◽  
Vol 23 (3) ◽  
pp. 1167-1179 ◽  
Author(s):  
Guiyao Zhou ◽  
Xuhui Zhou ◽  
Yanghui He ◽  
Junjiong Shao ◽  
Zhenhong Hu ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Meta Analysis ◽  
Grazing Intensity ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Grassland Ecosystems ◽  
Belowground Carbon

scholarly journals A Meta-Analysis of The Effects of Grazing On Plant Diversity, Biomass and Soil Properties of Alpine Grassland On The Tibetan Plateau

2021 ◽  
Author(s):  
Wenlong Li ◽  
Chenli Liu ◽  
Huakun Zhou ◽  
Wenying Wang ◽  
Jing Xu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Plant Diversity ◽  
Meta Analysis ◽  
Wiener Index ◽  
Belowground Biomass ◽  
Alpine Grassland ◽  
The Tibetan Plateau ◽  
Soil C ◽  
Soil C And N ◽  
C And N

Abstract Aim As one of the main human disturbance factors in the alpine grassland on the Tibetan Plateau, grazing not only directly affects grassland plant diversity and biomass, but also indirectly changes soil carbon (C) and nitrogen (N) of grassland. Despite of extensive field grazing experiments, the impacts of grazing on grassland diversity, soil C and N remain uncertain due to different grazing management.Methods We conducted a meta-analysis of 70 peer-reviewed publications to evaluate the general response of 11 variables related to alpine grassland plant-soil ecosystems to grazing.Results The results showed that grazing significantly increased species richness, Shannon-Wiener index and Pielou evenness index by 9.8%, 7.3% and 3.7%, respectively. Aboveground biomass, belowground biomass, soil organic carbon, soil total nitrogen, soil C: N ratio and soil moisture decreased by 41.9%, 17.7%, 13.1%, 12.6%, 3.3% and 20.8%, respectively. Soil bulk density and soil pH increased by 17.5% and 2.2%, respectively. Specifically, moderate grazing, long-duration (>5 years) and winter grazing contributed to the increase in the species richness, Shannon-Wiener index, and Pielou evenness index. Aboveground biomass, belowground biomass, soil organic carbon, soil total nitrogen and soil C: N ratio showed a decreasing trend with enhanced grazing intensity. Furthermore, grazing duration, grazing season, livestock type and grassland type also affected alpine grassland plant diversity, biomass, soil C and N.Conclusions Grazing is beneficial to the maintenance of plant diversity, but negatively affects the storage of soil C and N in alpine grassland on the Tibetan Plateau. We suggest that grazing should follow intermediate grazing practice and synthesize other appropriate grazing patterns, such as seasonal and rotation grazing, thus, further research on grazing management is needed in this regard.

scholarly journals The Restoration Potential of the Grasslands on the Tibetan Plateau

2021 ◽  
Vol 14 (1) ◽  
pp. 80
Author(s):  
Ruijing Wang ◽  
Qisheng Feng ◽  
Zheren Jin ◽  
Tiangang Liang
Keyword(s):  
Tibetan Plateau ◽  
Net Primary Productivity ◽  
Meteorological Data ◽  
Alpine Grassland ◽  
Northwestern Part ◽  
The Tibetan Plateau ◽  
Alpine Grasslands ◽  
Local Conditions ◽  
Grassland Ecosystems ◽  
Restoration Potential

While the alpine grassland ecosystems on the Tibetan Plateau (TP) have generally improved in recent years, some grasslands still suffer from varying degrees of degradation. Studying the restoration potential (R) of the grasslands on the TP is crucial to the conservation and restoration of its alpine grassland ecosystems. Few studies have assessed the restoration value of the alpine grasslands on the TP. We attempt to estimate the actual (ANPP) and potential net primary productivity (PNPP) of the grasslands on the TP. On this basis, we defined R as the “gap” between the current and highest achievable levels of restoration of a grassland. Then, R estimates were yielded for the alpine grasslands on the TP, which we used to analyze the restoration value of these grasslands. Specifically, based on the meteorological data for the period 2001–2019, in conjunction with remote-sensing imagery acquired by a moderate-resolution imaging spectroradiometer for the same period, the Carnegie–Ames–Stanford approach model was selected to produce ANPP estimates for the grasslands on the TP. Then, the Thornthwaite memorial model, the principle of similar habitats, and the Chikugo model, were employed to generate PNPP estimates for these grasslands. In addition, the R of these grasslands was then assessed based on the difference between their PNPP and ANPP. The main results are summarized as follows. (1) A multiyear mean R of 332.33 g C·m–2 (81.59% of the ANPP) was determined for the grasslands on the TP over the period 2001–2019. A notable spatial distribution pattern of high Rs in the southwestern, eastern and middle parts of the TP, and low Rs in the northwestern part of the TP were also identified. Most of the grasslands in areas such as the southern part of Nagqu, the southwestern part of Ngari, Xigaze, Garze Tibetan Autonomous Prefecture, Aba Tibetan and Qiang Autonomous Prefecture, Gannan Tibetan Autonomous Prefecture, Huangnan Tibetan Autonomous Prefecture, Haibei Tibetan Autonomous Prefecture, Guoluo Tibetan Autonomous Prefecture and Yushu Tibetan Autonomous Prefecture were found to have high restoration value. (2) Grasslands with a stable R account were the highest proportion (76.13%) of all the grasslands on the TP, followed by those with a decreasing R (19.62%) and those with an increasing R (4.24%). Grasslands with an increasing R were mainly concentrated in the southern part of Xigaze, and parts of Yushu Tibetan Autonomous Prefecture, Guoluo Tibetan Autonomous Prefecture and Garze Tibetan Autonomous Prefecture. (3) Analysis based on the local conditions of the TP revealed a high restoration value for three types of grassland (i.e., alpine meadows, mountain meadows, and temperate meadow steppes), the grasslands distributed at altitudes of 3000–4000 m, and the grasslands located in the warm temperate zone. The results of this study are expected to provide scientific and theoretical support for the formulation of policies and measures aimed at conserving grasslands, as well as restoring ecosystems and degraded grasslands on the TP.

scholarly journals Meta-analysis of relationships between environmental factors and aboveground biomass in the alpine grassland on the Tibetan Plateau

2013 ◽  
Vol 10 (3) ◽  
pp. 1707-1715 ◽  
Author(s):  
J. Sun ◽  
G. W. Cheng ◽  
W. P. Li
Keyword(s):  
Soil Moisture ◽  
Tibetan Plateau ◽  
Environmental Factors ◽  
Aboveground Biomass ◽  
Alpine Meadow ◽  
Meta Analysis ◽  
Alpine Grassland ◽  
Mean Annual Precipitation ◽  
The Tibetan Plateau ◽  
Alpine Steppe

Abstract. The Tibetan Plateau, known as the "world's third pole" for its extremely harsh and fragile ecological environment, has attracted great attention because of its sensitivity to global changes. Alpine grassland on the Tibetan Plateau has an important function in the global carbon cycle. Many studies have examined the effects of various environmental factors on biomass distribution. In this study, the relationships between the habitat parameters and the aboveground biomass (AGB) abundance on the Tibetan Plateau were examined through a meta-analysis of 110 field sites across the widely distributed alpine steppe and meadow. The obtained data were then analysed using the classification and regression tree model and the generalized additive model. The results showed that the AGB abundance in alpine steppe was positively correlated with six environmental factors, namely, soil organic carbon density of the top soil layer from 0 cm to 30 cm (SOC30 cm), longitude, mean annual precipitation (MAP), latitude, clay, and soil moisture. For the alpine meadow, five main factors were detected, namely, altitude, soil moisture, nitrogen, MAP, and mean annual temperature. The increased AGB abundance in the alpine steppe was associated with the increased SOC30 cm, MAP, and latitude, and the increased longitude resulted in decreased AGB abundance. For the alpine meadow, altitude and soil moisture showed strongly negative effects on AGB abundance, and soil nitrogen content was positively related to the AGB distribution across all examined sites. Our results suggest the combined effects of meteorological, topographic, and soil factors on the spatial patterns of AGB on the Tibetan Plateau.

scholarly journals Microbial carbon and nitrogen cycling responses to drought and temperature in differently managed mountain grasslands

2019 ◽  
Vol 135 ◽  
pp. 144-153 ◽  
Author(s):  
Lucia Fuchslueger ◽  
Birgit Wild ◽  
Maria Mooshammer ◽  
Mounir Takriti ◽  
Sandra Kienzl ◽  
...  
Keyword(s):  
Nitrogen Cycling ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Cycling ◽  
Mountain Grasslands ◽  
Microbial Carbon

scholarly journals Spatial-Temporal Patterns and Controls of Evapotranspiration across the Tibetan Plateau (2000–2012)

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Hao Zhang ◽  
Jian Sun ◽  
Junnan Xiong
Keyword(s):  
Tibetan Plateau ◽  
Environmental Factors ◽  
Vegetation Type ◽  
Middle Part ◽  
Rate Of Change ◽  
Ecological Indicator ◽  
The Tibetan Plateau ◽  
Grassland Ecosystems ◽  
Key Factor ◽  
Positive Correlations

Evapotranspiration (ET) is a key factor to further our understanding of climate change processes, especially on the Tibetan Plateau, which is sensitive to global change. Herein, the spatial patterns of ET are examined, and the effects of environmental factors on ET at different scales are explored from the years 2000 to 2012. The results indicated that a steady trend in ET was detected over the past decade. Meanwhile, the spatial distribution shows an increase of ET from the northwest to the southeast, and the rate of change in ET is lower in the middle part of the Tibetan Plateau. Besides, the positive effect of radiation on ET existed mainly in the southwest. Based on the environment gradient transects, the ET had positive correlations with temperature (R>0.85, p<0.0001), precipitation (R > 0.89, p < 0.0001), and NDVI (R > 0.75, p < 0.0001), but a negative correlation between ET and radiation (R = 0.76, p < 0.0001) was observed. We also found that the relationships between environmental factors and ET differed in the different grassland ecosystems, which indicated that vegetation type is one factor that can affect ET. Generally, the results indicate that ET can serve as a valuable ecological indicator.

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