scholarly journals Belowground Bud Bank Distribution and Aboveground Community Characteristics along Different Moisture Gradients of Alpine Meadow in the Zoige Plateau, China

2019 ◽  
Vol 11 (9) ◽  
pp. 2602
Author(s):  
Xinjing Ding ◽  
Peixi Su ◽  
Zijuan Zhou ◽  
Rui Shi
Keyword(s):  
Plant Community ◽  
Plant Diversity ◽  
Alpine Meadow ◽  
Bud Bank ◽  
Alpine Meadows ◽  
Water Gradient ◽  
Positive Correlations ◽  
Zoigê Plateau ◽  
Plant Community Succession ◽  
Zoige Plateau

The belowground bud bank plays an important role in plant communities succession and maintenance. In order to understand the response of the bud bank to the sod layer moisture, we investigated the bud bank distribution, size, and composition of six different water gradient alpine meadows through excavating in the Zoige Plateau. The results showed: (1) The alpine meadow plant belowground buds were mainly distributed in the 0–10 cm sod layer, accounting for 74.2%–100% of the total. The total bud density of the swamp wetland and degraded meadow was the highest (16567.9 bud/m3) and the lowest (4839.5 bud/m3). (2) A decrease of the moisture plant diversity showed a trend of increasing first and then decreasing. Among six alpine meadows the swamp meadow plant diversity was the highest, and species richness, Simpson, Shannon–Wiener, and Pielou were 10.333, 0.871, 0.944, and 0.931, respectively. (3) The moisture was significantly positively correlated with the total belowground buds and short rhizome bud density. There were significant positive correlations with sod layer moisture and tiller bulb bud density. This study indicates that the moisture affected bud bank distribution and composition in the plant community, and the results provide important information for predicting plant community succession in the alpine meadow with future changes in precipitation patterns.

Effects of different grazing strategies on zokor mounds plant community succession in alpine meadow

2020 ◽  
Vol 40 (8) ◽  
Author(s):  
张倩，杨晶，姚宝辉，蔡志远，孙小妹，王缠，郭怀亮，谭宇尘，苏军虎 ZHANG Qian
Keyword(s):  
Plant Community ◽  
Alpine Meadow ◽  
Community Succession ◽  
Grazing Strategies ◽  
Plant Community Succession

The Response of Vegetation Biomass to Soil Properties along Degradation Gradients of Alpine Meadow at Zoige Plateau

2020 ◽  
Vol 30 (3) ◽  
pp. 446-455
Author(s):  
Miao Liu ◽  
Zhenchao Zhang ◽  
Jian Sun ◽  
Ming Xu ◽  
Baibing Ma ◽  
...  
Keyword(s):  
Soil Properties ◽  
Alpine Meadow ◽  
Vegetation Biomass ◽  
Zoigê Plateau ◽  
Zoige Plateau

scholarly journals Priority effects, consumer pressure, and soil resources independently alter plant diversity and resource strategies during a multi-year successional field experiment

2019 ◽  
Author(s):  
Peter A. Wilfahrt ◽  
Fletcher W. Halliday ◽  
Robert W. Heckman
Keyword(s):  
Plant Community ◽  
Plant Diversity ◽  
Seed Mass ◽  
Taxonomic Diversity ◽  
Community Diversity ◽  
Priority Effects ◽  
List Type ◽  
Resident Species ◽  
Soil Resource ◽  
Plant Community Succession

SummaryPlant community succession is structured by priority effects, plant consumer pressure, and soil resource supply. Importantly, these drivers may interact, their effects may vary temporally, and they may influence different facets of plant community diversity by promoting different plant tradeoff strategies.In an herbaceous successional system, we manipulated priority effects by altering initial plant richness, consumer pressure via pesticide spraying, and soil resource supply via fertilization. We examined how these processes jointly influenced succession, including taxonomic diversity and functional traits, over four years.Diversity decreased in different years in response to more diverse priority effects, lower consumer pressure, and increased soil resource supply. Functionally, higher soil resource supply increased community height, SLA, and seed mass; higher consumer pressure decreased intraspecific community height, and increased interspecific SLA; priority effects led to decreased seed mass only when plots were unplanted.Our results suggest species’ resource strategies underlie plant diversity responses. Resource addition promoted resource-acquisitive species, consumer pressure disadvantaged resource-conservative species, and diversity of priority effects altered subsequent community composition through persistence of early residents, not via traits. We show that community responses to drivers of succession depend on underlying trait tradeoffs of resident species, and these tradeoffs influence community diversity across succession.

scholarly journals Effect of Grazing Intensities on Soil N2O Emissions from an Alpine Meadow of Zoige Plateau in China

Atmosphere ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 541
Author(s):  
Wei Zhan ◽  
Zhenan Yang ◽  
Jianliang Liu ◽  
Huai Chen ◽  
Gang Yang ◽  
...  
Keyword(s):  
Alpine Meadow ◽  
Emission Rate ◽  
Grazing Intensity ◽  
N2o Emission ◽  
N2o Emissions ◽  
Grazing Land ◽  
Growing Seasons ◽  
Grazing Intensities ◽  
Zoigê Plateau ◽  
Zoige Plateau

The alpine meadow of Zoige Plateau plays a key role in local livestock production of cattle and sheep. However, it remains unclear how animal grazing or its intensity affect nitrous oxide (N2O) emissions, and the main driving factors. A grazing experiment including four grazing intensities (G0, G0.7, G1.2, G1.6 yak ha−1) was conducted between January 2013 and December 2014 to evaluate the soil nitrous oxide (N2O) fluxes under different grazing intensities in an alpine meadow on the eastern Qinghai–Tibet Plateau of China. The N2O fluxes were examined with gas collected by the static chamber method and by chromatographic concentration analysis. N2O emissions in the growing seasons (from May to September) were lower than that in non-growing seasons (from October to April) in 2013, 1.94 ± 0.30 to 3.37 ± 0.56 kg N2O ha−1 yr−1. Annual mean N2O emission rates were calculated as 1.17 ± 0.50 kg N2O ha−1 yr−1 in non-grazing land (G0) and 1.94 ± 0.23 kg N2O ha−1 yr−1 in the grazing land (G0.7, G1.2, and G1.6). The annual mean N2O flux showed no significant differences between grazing treatments in 2013. However, there were significantly greater fluxes from the G0.7 treatment than from the G1.6 treatment in 2014, especially in the growing season. Over the two years, the soil N2O emission rate was significantly negatively correlated with soil water-filled pore space (WFPS) and dissolved organic carbon (DOC) content as well as positively correlated with soil available phosphorus (P). No relationship was observed between soil N2O emission rate and temperature or rainfall. Our results showed that the meadow soils acted as a source of N2O for most periods and turned into a weak sink of N2O later during the sampling period. Our results highlight the importance of proper grazing intensity in reducing N2O emissions from alpine meadow. The interaction between grazing intensity and N2O emissions should be of more concern during future management of pastures in Zoige Plateau.

Soil Organic Carbon and its Fractions in Relation to Degradation and Restoration of Wetlands on the Zoigê Plateau, China

Wetlands ◽  
2013 ◽  
Vol 34 (2) ◽  
pp. 235-241 ◽  
Author(s):  
Junqin Gao ◽  
Xuewen Zhang ◽  
Guangchun Lei ◽  
Guangxing Wang
Keyword(s):  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Zoigê Plateau ◽  
Zoige Plateau

scholarly journals Climate and plant community diversity in space and time

2020 ◽  
Vol 117 (9) ◽  
pp. 4464-4470 ◽  
Author(s):  
Susan Harrison ◽  
Marko J. Spasojevic ◽  
Daijiang Li
Keyword(s):  
Plant Community ◽  
Plant Diversity ◽  
Phylogenetic Diversity ◽  
Spatial Scales ◽  
Community Diversity ◽  
Niche Conservatism ◽  
Space And Time ◽  
Drying Trend ◽  
Functional And Phylogenetic Diversity ◽  
Over Time

Climate strongly shapes plant diversity over large spatial scales, with relatively warm and wet (benign, productive) regions supporting greater numbers of species. Unresolved aspects of this relationship include what causes it, whether it permeates to community diversity at smaller spatial scales, whether it is accompanied by patterns in functional and phylogenetic diversity as some hypotheses predict, and whether it is paralleled by climate-driven changes in diversity over time. Here, studies of Californian plants are reviewed and new analyses are conducted to synthesize climate–diversity relationships in space and time. Across spatial scales and organizational levels, plant diversity is maximized in more productive (wetter) climates, and these consistent spatial relationships are mirrored in losses of taxonomic, functional, and phylogenetic diversity over time during a recent climatic drying trend. These results support the tolerance and climatic niche conservatism hypotheses for climate–diversity relationships, and suggest there is some predictability to future changes in diversity in water-limited climates.

scholarly journals Are we missing the forest for the trees? Conspecific negative density dependence in a temperate deciduous forest

2021 ◽  
Author(s):  
Kathryn E. Barry ◽  
Stefan A. Schnitzer
Keyword(s):  
Life History ◽  
Density Dependence ◽  
Plant Community ◽  
Plant Diversity ◽  
Temperate Forest ◽  
Woody Plant ◽  
Community Level ◽  
Life History Strategies ◽  
Canopy Trees ◽  
Negative Density Dependence

AbstractOne of the central goals of ecology is to determine the mechanisms that enable coexistence among species. Evidence is accruing that conspecific negative density dependence (CNDD), the process by which plant seedlings are unable to survive in the area surrounding adults of their same species, is a major contributor to tree species coexistence. However, for CNDD to maintain diversity, three conditions must be met. First, CNDD must maintain diversity for the majority of the woody plant community (rather than merely specific groups). Second, the pattern of repelled recruitment must increase in with plant size. Third, CNDD must occurs across life history strategies and not be restricted to a single life history strategy. These three conditions are rarely tested simultaneously. In this study, we simultaneously test all three conditions in a woody plant community in a North American temperate forest. We examined whether the different woody plant growth forms (shrubs, understory trees, mid-story trees, canopy trees, and lianas) at different ontogenetic stages (seedling, sapling, and adult) were overdispersed – a spatial pattern indicative of CNDD – using spatial point pattern analysis across life history stages and strategies. We found that there was a strong signal of overdispersal at the community level. However, this pattern was driven by adult canopy trees. By contrast, understory plants, which can constitute up to 80% of temperate forest plant diversity, were not overdispersed as adults. The lack of overdispersal suggests that CNDD is unlikely to be a major mechanism maintaining understory plant diversity. The focus on trees for the vast majority of CNDD studies may have biased the perception of the prevalence of CNDD as a dominant mechanism that maintains community-level diversity when, according to our data, CNDD may be restricted largely to trees.

Landscape pattern evolution processes of alpine wetlands and their driving factors in the Zoige Plateau of China

2013 ◽  
Vol 10 (1) ◽  
pp. 54-67 ◽  
Author(s):  
Jun-hong Bai ◽  
Qiong-qiong Lu ◽  
Jun-jing Wang ◽  
Qing-qing Zhao ◽  
Hua Ouyang ◽  
...  
Keyword(s):  
Landscape Pattern ◽  
Driving Factors ◽  
Zoigê Plateau ◽  
Zoige Plateau
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