scholarly journals Response of Soil Respiration to Grazing in an Alpine Meadow at Three Elevations in Tibet

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Gang Fu ◽  
Xianzhou Zhang ◽  
Chengqun Yu ◽  
Peili Shi ◽  
Yuting Zhou ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Soil Respiration ◽  
Alpine Meadow ◽  
Elevation Gradient ◽  
Major Type ◽  
The Tibetan Plateau ◽  
Total N ◽  
Organic C ◽  
Nitrate N ◽  
Ammonium N

Alpine meadows are one major type of pastureland on the Tibetan Plateau. However, few studies have evaluated the response of soil respiration (Rs) to grazing along an elevation gradient in an alpine meadow on the Tibetan Plateau. Here three fenced enclosures were established in an alpine meadow at three elevations (i.e., 4313 m, 4513 m, and 4693 m) in July 2008. We measuredRsinside and outside the three fenced enclosures in July–September, 2010-2011. Topsoil (0–20 cm) samples were gathered in July, August, and September, 2011. There were no significant differences forRs, dissolved organic C (DOC), and belowground root biomass (BGB) between the grazed and ungrazed soils. Soil respiration was positively correlated with soil organic C (SOC), microbial biomass (MBC), DOC, and BGB. In addition, bothRsand BGB increased with total N (TN), the ratio of SOC to TN, ammonium N (NH4+-N), and the ratio ofNH4+-N to nitrate N. Our findings suggested that the negligible response ofRsto grazing could be directly attributed to that of respiration substrate and that soil N may indirectly affectRsby its effect on BGB.

scholarly journals Assessing Soil Quality for Sustainable Cropland Management Based on Factor Analysis and Fuzzy Sets: A Case Study in the Lhasa River Valley, Tibetan Plateau

2018 ◽  
Vol 10 (10) ◽  
pp. 3477 ◽  
Author(s):  
Fuqiang Dai ◽  
Zhiqiang Lv ◽  
Gangcai Liu
Keyword(s):  
Land Use ◽  
Tibetan Plateau ◽  
Soil Quality ◽  
Quality Index ◽  
Soil Types ◽  
The Tibetan Plateau ◽  
Soil Quality Index ◽  
Total N ◽  
Organic C ◽  
Land Use Types

Ecologically fragile cropland soils and intensive agricultural production are characteristic of the valley area of the Tibetan Plateau. A systematic assessment of soil quality is necessary and important for improving sustainable cropland management in this area. This study aims to establish a minimum data set (MDS) for soil quality assessment and generate an integrated soil quality index for sustainable cropland management in the Tibetan Plateau. Soil samples were collected from the 0–20 cm depths of agricultural land in the middle and lower reaches of the Lhasa River. These samples were analyzed by routine laboratory methods. Significant differences were identified via statistical test between different soil types and land use types for each soil property. Principal component analysis was used to define a MDS of indicators that determine soil quality. Consequently, effective porosity, pH, total organic C, total N, available P, and catalase were identified as the final MDS. The soil quality index was obtained by the fuzzy-set membership function and the linear weighted additive method. The soil quality index differed significantly between the soil types and land use types. The soil quality can be ranked based on their indices in the following order: 1. Grain land with meadow soils, 2. Grain land with steppe soils, 3. Greenhouse vegetable land with fluvo-aquic soils, 4. Grain land with fluvo-aquic soils. The soils with higher soil quality indices exhibited better soil structure, higher nutrient contents, and superior resistance to water and nutrient loss. While the intensive tillage practices associated with vegetable production could reduce the values for effective porosity, pH and catalase, the application of appropriate fertilizers increased the values for total organic C, total N and available P. Therefore, the MDS method is an effective and useful tool to identify the key soil properties for assessing soil quality, and provides guidance on adaptive cropland management to a variety of soil types and land use types.

Grazing intensity alters soil respiration in an alpine meadow on the Tibetan plateau

2004 ◽  
Vol 36 (2) ◽  
pp. 237-243 ◽  
Author(s):  
Guangmin Cao ◽  
Yanhong Tang ◽  
Wenhong Mo ◽  
Yuesi Wang ◽  
Yingnian Li ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Soil Respiration ◽  
Alpine Meadow ◽  
Grazing Intensity ◽  
The Tibetan Plateau

Effects of litter quality and climate change along an elevation gradient on litter mass loss in an alpine meadow ecosystem on the Tibetan plateau

Plant Ecology ◽  
2009 ◽  
Vol 209 (2) ◽  
pp. 257-268 ◽  
Author(s):  
Guangping Xu ◽  
Yigang Hu ◽  
Shiping Wang ◽  
Zhenhua Zhang ◽  
Xiaofeng Chang ◽  
...  
Keyword(s):  
Climate Change ◽  
Tibetan Plateau ◽  
Mass Loss ◽  
Litter Quality ◽  
Alpine Meadow ◽  
Elevation Gradient ◽  
The Tibetan Plateau ◽  
Litter Mass ◽  
Litter Mass Loss

scholarly journals Climatic patterns modulate ecosystem and soil respiration responses to fertilization in an alpine meadow on the Tibetan Plateau, China

2014 ◽  
Vol 30 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Jing Jiang ◽  
Peili Shi ◽  
Ning Zong ◽  
Gang Fu ◽  
Zhenxi Shen ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Soil Respiration ◽  
Alpine Meadow ◽  
The Tibetan Plateau

scholarly journals Response of Soil C and N, Dissolved Organic C and N, and Inorganic N to Short-Term Experimental Warming in an Alpine Meadow on the Tibetan Plateau

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Cheng-Qun Yu ◽  
Zhen-Xi Shen ◽  
Xian-Zhou Zhang ◽  
Wei Sun ◽  
Gang Fu
Keyword(s):  
Alpine Meadow ◽  
The Tibetan Plateau ◽  
Experimental Warming ◽  
Inorganic N ◽  
Short Term ◽  
Total N ◽  
Organic C ◽  
Dissolved Organic C ◽  
Short Period ◽  
C And N

Although alpine meadows of Tibet are expected to be strongly affected by climatic warming, it remains unclear how soil organic C (SOC), total N (TN), ammonium N(NH4+-N), nitrate N(NO3+-N), and dissolved organic C (DOC) and N (DON) respond to warming. This study aims to investigate the responses of these C and N pools to short-term experimental warming in an alpine meadow of Tibet. A warming experiment using open top chambers was conducted in an alpine meadow at three elevations (i.e., a low (4313 m), mid-(4513 m), and high (4693 m) elevation) in May 2010. Topsoil (0–20 cm depth) samples were collected in July–September 2011. Experimental warming increased soil temperature by ~1–1.4°C but decreased soil moisture by ~0.04 m3m−3. Experimental warming had little effects on SOC, TN, DOC, and DON, which may be related to lower warming magnitude, the short period of warming treatment, and experimental warming-induced soil drying by decreasing soil microbial activity. Experimental warming decreased significantly inorganic N at the two lower elevations,but had negligible effect at the high elevation. Our findings suggested that the effects of short-term experimental warming on SOC, TN and dissolved organic matter were insignificant, only affecting inorganic forms.

Sustained increase in soil respiration after nine years of warming in an alpine meadow on the Tibetan Plateau

Geoderma ◽  
2020 ◽  
Vol 379 ◽  
pp. 114641
Author(s):  
Fei Peng ◽  
Wenjuan Zhang ◽  
Chengyang Li ◽  
Chimin Lai ◽  
Jun Zhou ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Soil Respiration ◽  
Alpine Meadow ◽  
The Tibetan Plateau ◽  
Sustained Increase

scholarly journals Warming Changed Soil Respiration Dynamics of Alpine Meadow Ecosystem on the Tibetan Plateau

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Junfeng Wang
Keyword(s):  
Global Warming ◽  
Soil Moisture ◽  
Tibetan Plateau ◽  
Soil Respiration ◽  
Co2 Emission ◽  
Alpine Meadow ◽  
The Tibetan Plateau ◽  
Soil Co2 ◽  
Q10 Value ◽  
Soil Co2 Emission

Alpine meadow system underlain by permafrost on the Tibetan Plateau contains vast soil organic carbon and is sensitive to global warming. However, the dynamics of annual soil respiration (Rs) under long-term warming and the determined factors are still not very clear. Using open-top chambers (OTC), we assessed the effects of two-year experimental warming on the soil CO2 emission and the Q10 value (temperature sensitivity coefficient) under different warming magnitudes. Our study showed that the soil CO2 efflux rate in the warmed plots were 1.22 and 2.32 times higher compared to that of controlled plots. However, the Q10 value decreased by 45.06% and 50.34% respectively as the warming magnitude increased. These results suggested that soil moisture decreasing under global warming would enhance soil CO2 emission and lower the temperature sensitivity of soil respiration rate of the alpine meadow ecosystem in the permafrost region on the Tibetan Plateau. Thus, it is necessary to take into account the combined effect of ground surface warming and soil moisture decrease on the Rs in order to comprehensively evaluate the carbon emissions of the alpine meadow ecosystem, especially in short and medium terms.

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