Temporal Patterns of Shrub Vegetation and Variation with Precipitation in Gurbantunggut Desert, Central Asia

Yang, Yuguang; Zhao, Chengyi; Han, Mei; Li, Yike; Yang, Ruihong

doi:10.1155/2015/157245

Cited by 14 publications

(11 citation statements)

References 45 publications

(56 reference statements)

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“…The hysteretic effects of APRE on vegetation in the NTEM were pronounced by one to two months (Figure c), which may be associated with the interseasonal growth strategies of green plants; that is, plant growth was highly correlated with precipitation in the early growing season but had weak correlation with precipitation in the later growing season (Figure S31c; Huxman et al, ), because plant growth is more restrained by other biogeochemical limits in the later growing season, such as the availability of nitrogen and light (Huxman et al, ; Xu et al, ). This mechanism is supported by the studies by Yang et al () and Forzieri et al (). In the arid, semiarid and subhumid ecosystems, that is, the African Sahel, southern Africa, central Eurasia, and Australia, where the primary limited factor for plant growth was moisture (Figures and S22), eye‐catching long‐term lags exhibiting in the responses of green plants to ATEM and APRE.…”

Section: Discussionsupporting

confidence: 71%

Cumulative Effects of Climatic Factors on Terrestrial Vegetation Growth

et al. 2019

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Extensive studies have focused on instantaneous and time-lag impacts of climatic factors on vegetation growth; however, the chronical and accumulative indirect impacts of antecedent climatic factors carrying over for a period of time on vegetation growth, defined as cumulative effects, are less investigated. Here we aimed to disentangle the cumulative effects of climatic factors on vegetation growth by using vegetation indexes and accumulated meteorological data. First, we investigated the explanation and fit of climate changes on vegetation variations by applying stepwise multiple linear regression with Akaike information criterion. Then, we obtained the correlation coefficients and lagged time of climatic factors on vegetation growth whereby partial correlation and time-lag effect analyses. Results showed that (i) consideration of cumulative climate effects increased the explanation and fit of climate changes on vegetation dynamics for more than 77% of vegetated surface with an average global explanation of 68.33%, which was approximately 3.35% higher than the scenario when only time-lag effects were considered; (ii) big differences exhibited in the correlation coefficients and lagged times under the scenarios with cumulative climate effects considered or not; and (iii) positive accumulated temperature (accumulated solar radiation) effects with zero (three-month) time lag dominates most mid-high latitude ecosystems, and negative accumulated temperature effects with three-month delay dominates the temperate arid and semiarid regions and tropical dry ecosystems. By comparison, accumulated precipitation had relatively complex cumulative effects on vegetation growth. We concluded that climatic factors had significant cumulative effects on vegetation growth; consideration of the cumulative effects helps us better understand the climate-vegetation interactions. Key Points: • The climatic factors had significant cumulative impacts on vegetation growth, which were varied by climatic factors and spaces • Additional consideration of the cumulative impacts increased the explanation and fit of climatic factors on plant growth • The correlation coefficients and lagged times of climatic factors on plant growth were very different if we included cumulative impacts Supporting Information: • Supporting Information S1

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Section: Discussionsupporting

confidence: 71%

Cumulative Effects of Climatic Factors on Terrestrial Vegetation Growth

et al. 2019

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“…Therefore, the application of salt crust to sand soil treatment has certain limitations, so salt crust should be used in arid areas with low rainfall and high evaporation 38 . In the deserts in western China, the annual rainfall is less than 150 mm, and little rainfall within 0–5 mm accounts for approximately 70% of the total rainfall frequency 39 – 41 . After rain, rapid evaporation can lead to rapid salt crust formation.…”

Section: Discussionmentioning

confidence: 99%

Characteristics of soil salt crust formed by mixing calcium chloride with sodium sulfate and the possibility of inhibiting wind-sand flow

2021

Sci Rep

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Soil salt crust can change the structure of aeolian soil and improve its resistance to wind erosion. Four ions (Na+, Ca2+, Cl−, and SO42−) with high contents in aeolian soil were selected for a salt crust experiment. The experiment set a variety of gradients of soil salt contents and salt mixing ratios of Na2SO4 and CaCl2. The physical properties of the salt crust were tested, and the wind erosion resistance of the salt crust was discussed. The results showed that the soil salt contents and salt mixing ratio influenced the resistance of the salt crust, especially in terms of its compressive strength and toughness. The former affected the compressive strength of the salt crust by changing the amount of cemented soil salt. The latter affected the kinds of crystals by changing the ion ratio, thus changing the structure of the salt crust and affecting its wind erosion resistance. The wind erosion resistance of the salt crust is complicated by the interaction between the soil salt content and salt mixing ratio. A multilayer crust can be formed in mixed salt, which has a strong wind erosion resistance. This result provides new findings on flowing sand soil and a new method for the treatment of flowing sand soil.

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“…The two opposing processes each appeared throughout the successional gradient of vegetation in the present study, and greatly impacted the SOC and TN content and storage in desert regions. Although the C and N pools are comprised of both plants and soil, the soil C pool is considered the main pool, occupying more than 90% of the C in arid and cold ecosystems [28]. Hence, only C and N in soil were investigated in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, studying the succession of N. tangutorum vegetation is vital for evaluating the damage of this ecosystem and developing a strategy for its restoration [26]. Interest in N. tangutorum nebkhas is increasing, and numerous studies have described the characteristics of its vegetation and soil nutrient contents [27,28], the structure and quantitative characteristics of its communities [29], its seed germination effects on water and salinity stresses [30], the changing characteristics of its soil seed banks [25], the impact of clonal reproduction as well as the allocation of biomass of layering modules [31], its diversity in species and the distribution of vegetation [32], the relationships of its vegetation and precipitation to soil respiration [33] and its root distribution and water uptake dynamics [13]. However, knowledge on the characteristics of C and N in soil during the succession of N. tangutorum communities is still limited, especially in the arid desert regions of northwest China.…”

Section: Introductionmentioning

confidence: 99%

Change in Characteristics of Soil Carbon and Nitrogen during the Succession of Nitraria Tangutorum in an Arid Desert Area

et al. 2019

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The shrub Nitraria tangutorum is distributed widely in arid desert areas, and plays a critical role in the desert–oasis ecosystem. This study quantified varying characteristics of carbon (C) and nitrogen (N) in the soil at four stages—the initial stage (IS), stable stage (SS), degradation stage (DS), and severe degradation stage (SDS)—in a steppe ecosystem in the desert of northwestern China. The results indicated that N. tangutorum experienced both expansion and deterioration as a decline of 50.7% occurred in the available soil water due to agricultural utilization, and the plant community transformed from being shrub-dominated to annual herb-dominated. At soil layer depths between 0–100 cm in the N. tangutorum nebkha dune ecosystem, organic C and total N storage was 1195.84 g/m2 and 115.01 g/m2 during the SDS, respectively, with an increase of 11.13% and 12.59% from the IS. In addition, the storage of C and N in the soil increased during the IS as well as the SS, when most of the C and N were accumulated, and the storage decreased during the DS and SDS, as the N. tangutorum communities declined. At soil layer depths between 0–100 cm in the desert steppe ecosystem, the highest storage levels of C and N were 8465.97 g/m2 and 749.29 g/m2 during the SS, and the lowest were 1076.12 g/m2 and 102.15 g/m2 during the IS, respectively. The changes and accumulation of C and N were greater in the deeper (40–100 cm) layer than in the surface layer of soil (0–40 cm). Lastly, changes in soil organic carbon (SOC) as well as in the total nitrogen (TN) were strongly related to the coverage degree, water content in soil, and the ratio of fine soil particles (silt and clay). To sum up, the intensive development of water resources has vastly reduced the ability of N. tangutorum vegetation to sequester C and N in the desert of Minqin. Efforts to perform ecological restoration and reverse desertification in the Minqin Desert should focus on preventing the unreasonable exploitation of water resources in order to maintain stable N. tangutorum communities.

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Temporal Patterns of Shrub Vegetation and Variation with Precipitation in Gurbantunggut Desert, Central Asia

Cited by 14 publications

References 45 publications

Cumulative Effects of Climatic Factors on Terrestrial Vegetation Growth

Cumulative Effects of Climatic Factors on Terrestrial Vegetation Growth

Characteristics of soil salt crust formed by mixing calcium chloride with sodium sulfate and the possibility of inhibiting wind-sand flow

Change in Characteristics of Soil Carbon and Nitrogen during the Succession of Nitraria Tangutorum in an Arid Desert Area

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