Impacts of Human Disturbance on Elms-motte-veldt in Hunshandak Sandland

Li, Yonggeng; Gaoming, Jiang; Gao, Lian‐Ming; Shu-Li, Niu; Liu, Meizhen; Shun-Li, YU; Yu, PENG

doi:10.17521/cjpe.2003.0119

Cited by 5 publications

(1 citation statement)

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“…An ecosystem of Elm (Ulmus pumila L.) woodland characterizes the climatic climax community in the semi-arid Hunshandake Sandy Land in northern China, and the vegetation is represented by sparse Ulmus pumila and abundant shrub communities [8]. Shrubs account for a large proportion of the ecosystem's total biomass and play an essential role in sand-dune stabilization and other ecological functions.…”

Section: Introductionmentioning

confidence: 99%

Biomass Estimation Models for Six Shrub Species in Hunshandake Sandy Land in Inner Mongolia, Northern China

Yao

Yang

et al. 2021

Forests

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Shrub biomass estimation is valuable in assessing ecological health, soil, and water conservation capacity, and carbon storage in arid areas, where trees are scattered, and shrubs are usually dominant. Most shrub biomass estimation models are derived from trees designed for trees, yet shrubs and trees show significant differences in morphology. However, current biomass estimation methods specifically for shrubs are still lacking. This study aimed to test various predictors’ performance in estimating shrub biomass, particularly providing an improved cone frustum volume model as a new predictor. Seven different variables, including three univariates and four composite variables, were selected as predictors in allometric models. Six dominant shrub species of different sizes and morphology in the semi-arid Hunshandake Sandy Land in Inner Mongolia were selected as samples to test the seven predictors’ performances in above-ground biomass estimation. Results showed that the single measurements performed poorly and were not suitable for shrub biomass estimation. The allometric models, including crown-related volumes as predictors, performed much better and were considered ideal for common shrub biomass estimation. The improved cone frustum volume model had more flexible geometric for shrubs of different shapes and sizes, with high fitting accuracy and stability among all the volume predictors. Therefore, we recommend the volume of an inverted cone frustum with a crown diameter and ground diameter as the long and short diameters as an excellent predictor of shrub biomass estimation, especially when studies involve various shrub species, and a general model would be needed.

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Section: Introductionmentioning

confidence: 99%

Biomass Estimation Models for Six Shrub Species in Hunshandake Sandy Land in Inner Mongolia, Northern China

Yao

Yang

et al. 2021

Forests

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Photosynthetic response to precipitation/rainfall in predominant tree (Ulmus pumila) seedlings in Hunshandak Sandland, China

Jiang

Liu

et al. 2007

Photosynt.

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The responses of gas exchange and chlorophyll fluorescence of field-growing Ulmus pumila seedlings to changes in simulated precipitation were studied in Hunshandak Sandland, China. Leaf water potential (Ψ wp ), net photosynthetic rate (P N ), stomatal conductance (g s ), and transpiration rate (E) were significantly increased with enhancement of precipitation from 0 to 20 mm (p<0.01), indicating stomatal limitation of U. pumila seedlings that could be avoided when soil water was abundant. However, P N changed slightly when precipitation exceeded 20 mm (p>0.05), indicating more precipitation than 20 mm had no significant effects on photosynthesis. Maximum photochemical efficiency of photosystem 2, PS 2 (F v /F m ) increased from 0.53 to 0.78 when rainfall increased from 0 to 10 mm, and F v /F m maintained a steady state level when rainfall was more than 10 mm. Water use efficiency (WUE) decreased significantly (from 78-95 to 23-27 μmol mol -1 ) with enhancement of rainfalls. P N showed significant linear correlations with both g s and Ψ wp (p<0.0001), which implied that leaf water status influenced gas exchange of U. pumila seedlings. The 20-mm precipitation (soil water content at about 15 %, v/v) might be enough for the growth of elm seedlings. When soil water content (SWC) reached 10 %, down regulation of PS2 photochemical efficiency could be avoided, but stomatal limitation to photosynthesis remained. When SWC exceeded 15 %, stomatal limitation to photosynthesis could be avoided, indicating elm seedlings might tolerate moderate drought.Additional key words: drought stress; leaf water potential; maximum photochemical efficiency; water use efficiency.

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Effects of Sand Burial on Survival, Growth, Gas Exchange and Biomass Allocation of Ulmus pumila Seedlings in the Hunshandak Sandland, China

Shi¹,

Zhang²,

Zhang³

et al. 2004

Annals of Botany

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Impacts of Human Disturbance on Elms-motte-veldt in Hunshandak Sandland

Cited by 5 publications

References 0 publications

Biomass Estimation Models for Six Shrub Species in Hunshandake Sandy Land in Inner Mongolia, Northern China

Biomass Estimation Models for Six Shrub Species in Hunshandake Sandy Land in Inner Mongolia, Northern China

Photosynthetic response to precipitation/rainfall in predominant tree (Ulmus pumila) seedlings in Hunshandak Sandland, China

Effects of Sand Burial on Survival, Growth, Gas Exchange and Biomass Allocation of Ulmus pumila Seedlings in the Hunshandak Sandland, China

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