Spatial and temporal variability in the net primary production of alpine grassland on the Tibetan Plateau since 1982

Zhang, Yili; Qi, Wei; Zhou, Caiping; Ding, M. D.; Liu, Linshan; Gao, Jungang; Bai, Weihua; Wang, Zhaofeng; Du, Zheng

doi:10.1007/s11442-014-1087-1

Cited by 151 publications

(102 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Alpine grassland NPP data were taken from Zhang et al (2014) for the period 1982-2009 at a spatial resolution of 0.05. This dataset was based on Global Inventory Modeling and Mapping Studies (GIMMS) NDVI and SPOT VEGETATION NDVI data; the CarnegieAmes-Stanford Approach model was used to estimate the results.…”

Section: Spatial Datamentioning

confidence: 99%

“…This dataset was based on Global Inventory Modeling and Mapping Studies (GIMMS) NDVI and SPOT VEGETATION NDVI data; the CarnegieAmes-Stanford Approach model was used to estimate the results. The process of model calculation and the method for verifying the model results are based on previously published methods (Potter et al, 1993;Crabtree et al, 2009;Zhang et al, 2014). The boundary of the Tibetan Plateau was taken as that defined by Zhang et al (2002).…”

Section: Spatial Datamentioning

confidence: 99%

“…In recent decades, the NPP estimated by remote sensing has been widely used in vegetation ecosystem studies (Melillo et al, 1993;Potter et al, 1993;Running et al, 2004;Shvidenko et al, 2008;Crabtree et al, 2009). Based on remote sensing and observational plant biomass data, Zhang et al (2014) used the Carnegie-Ames-Stanford Approach model to determine the spatio-temporal variability in the alpine grassland NPP on the Tibetan Plateau since 1982. This enabled the quantitative assessment of the effectiveness of protection of nature reserves on the Tibetan Plateau from the perspective of changes in the ecological system based on long time series data obtained by remote sensing.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method

Zhang

et al. 2016

J. Geogr. Sci.

Self Cite

View full text Add to dashboard Cite

Twenty-one typical coupled large samples were chosen from areas within and surrounding nature reserves on the Tibetan Plateau using the large sample comparison method (LSCM). To evaluate the effectiveness of the nature reserves in protecting the ecological environment, the alpine grassland net primary production (NPP) of these coupled samples were compared and the differences between them before and after their establishment as protected areas were analyzed. The results showed that: (1) With respect to the alpine grassland NPP, the ecological and environmental conditions of most nature reserves were more fragile than those of the surrounding areas and also lower than the average values for the Tibetan Plateau. (2) Of the 11 typical nature reserves selected, the positive trend in the NPP for Manzetang was the most significant, whereas there was no obvious trend in Taxkorgan. With the exception of Selincuo, the annual NPP growth rate in the nature reserves covered by alpine meadow and wetland was higher than that in nature reserves consisting of alpine steppe and alpine desert. (3) There were notable findings in 21 typical coupled samples: (a) After the establishment of the nature reserves, the annual rate of increase in the NPP in 76% of samples inside nature reserves and 82% of samples inside national nature reserves was higher than that of the corresponding samples outside nature reserves. (b) The effectiveness of ecological protection of the Mid-Kunlun, Changshagongma, Zoige and Selincuo (Selin Co) nature reserves was significant; the effectiveness of protection was relatively sig-28 Journal of Geographical Sciences nificant in most parts of the Sanjiangyuan and Qiangtang nature reserves, whereas in south-east Manzetang and north Taxkorgan the protection effectiveness was not obvious. (c) The ecological protection effectiveness was significant in nature reserves consisting of alpine meadow, but was weak in nature reserves covered by alpine steppe. This study also shows that the advantage of large sample comparison method in evaluating regional ecology change. Careful design of the samples used, to ensure comparability between the samples, is crucial to the success of this LSCM.

show abstract

Section: Spatial Datamentioning

confidence: 99%

Section: Spatial Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method

Zhang

et al. 2016

J. Geogr. Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous studies on degraded grassland restoration primarily monitored either spatiotemporal changes in vegetation coverage or net primary productivity (NPP) based on the Normalized Difference Vegetation Index (NDVI) datasets at large regional scales (Chen et al 2014;Zhang et al 2014) or compared species composition and aboveground productivity in situ at a few local sites with adjacent pastures fenced and excluded from animal grazing for several years (Wu et al 2012(Wu et al , 2013b(Wu et al , 2014bShang et al 2013). Miehe et al (2011) have emphasized that the analysis of the patterns of anthropogenic disturbances cannot be performed with Landsat ETM+imagery, although it is currently available, and that the assessment or classification of grassland degradation in a given region requires more detailed field measurements.…”

Section: Introductionmentioning

confidence: 99%

“…Remote sensing data, therefore, are not the most effective tool for determining whether a recovery in degraded grasslands has taken place under a specific protective management. In addition, there seems to be a discordance between the increasing trends in grassland productivity modeled-based remote sensing data over past decades (Chen et al 2014;Zhang et al 2014) and the increasing mortality among domestic animals as a result of locoweed invasion and dispersion ). Not all plants within a given community are suitable forage for domestic animals, and some locoweeds, such as certain species of Astragalus and Oxytropis, are even poisonous to young weanlings and pregnant dams (Cook et al 2009;Jin et al 2011;Lu et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Spatial and climatic patterns of the relative abundance of poisonous vs. non-poisonous plants across the Northern Tibetan Plateau

Yang

Zhang

et al. 2015

Environ Monit Assess

View full text Add to dashboard Cite

It is the most serious challenge to promote degraded grassland recovery currently facing the developing Tibetan Autonomous Region. We conducted field surveys of 75 grazing sites between 2009 and 2012 across the Northern Tibetan Plateau and described the spatial and climatic patterns of the occurrence of poisonous plants. Our results showed lower ratios of species richness (SprRatio), coverage (CovRatio), and biomass (BioRatio) of non-poisonous vs. poisonous plants in the semi-arid alpine steppe zone, where the growing season precipitation (GSP) is between 250 and 350 mm; however, this result is in contrast to the relatively wetter meadow (GSP >350 mm) and much drier desert-steppe (GSP <250 mm) communities. Results from generalized additive models (GAMs) further confirmed that precipitation is primarily responsible for the initially decreasing and then increasing tendency of compositional ratios of non-poisonous to poisonous species. The wide confidence bands at GSP <250 mm indicated that precipitation is not an effective indicator for predicting compositional changes in desert-steppe communities. When mean annual livestock grazing pressure was incorporated into the optimal GAMs, the model performance improved: the Akaike information criterion (AIC) decreased by 1.20 for SprRatio and 3.09 for BioRatio, and the deviance explained (R 2 ) increased by 6.0 % for SprRatio and 3.6 % for BioRatio. Therefore, more detailed information on grazing disturbance (timing, frequency, and density) should be collected to disentangle the relative contribution of climate change and grazing activities to changes in community assembly and ecological functions of alpine grasslands on the Northern Tibetan Plateau.

show abstract

Analysis of spatial and temporal patterns of aboveground net primary productivity in the Eurasian steppe region from 1982 to 2013

Jiao

et al. 2017

Ecology and Evolution

View full text Add to dashboard Cite

To explore the importance of the Eurasian steppe region (EASR) in global carbon cycling, we analyzed the spatiotemporal dynamics of the aboveground net primary productivity (ANPP) of the entire EASR from 1982 to 2013. The ANPP in the EASR was estimated from the Integrated ANPPNDVI model, which is an empirical model developed based on field‐observed ANPP and long‐term normalized difference vegetation index (NDVI) data. The optimal composite period of NDVI data was identified by considering spatial heterogeneities across the study area in the Integrated ANPPNDVI model. EASR's ANPP had apparent zonal patterns along hydrothermal gradients, and the mean annual value was 43.78 g C m−2 yr−1, which was lower than the global grasslands average. Compared to other important natural grasslands, EASR's ANPP was lower than the North American, South American, and African grasslands. The total aboveground net primary productivity (TANPP) was found to be 378.97 Tg C yr−1, which accounted for 8.18%–36.03% of the TANPP for all grasslands. In addition, EASR's TANPP was higher than that of the grasslands in North America, South America, and Africa. The EASR's TANPP increased in a fluctuating manner throughout the entire period of 1982–2013. The increasing trend was greater than that for North American and South American and was lower than that for African grasslands over the same period. The years 1995 and 2007 were two turning points at which trends in EASR's TANPP significantly changed. Our analysis demonstrated that the EASR has been playing a substantial and progressively more important role in global carbon sequestration. In addition, in the development of empirical NDVI‐based ANPP models, the early–middle growing season averaged NDVI, the middle–late growing season averaged NDVI and the annual maximum NDVI are recommended for use for semi‐humid regions, semi‐arid regions, and desert vegetation in semi‐arid regions, respectively.

show abstract

Spatial and temporal variability in the net primary production of alpine grassland on the Tibetan Plateau since 1982

Cited by 151 publications

References 16 publications

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method

Assessment of effectiveness of nature reserves on the Tibetan Plateau based on net primary production and the large sample comparison method

Spatial and climatic patterns of the relative abundance of poisonous vs. non-poisonous plants across the Northern Tibetan Plateau

Analysis of spatial and temporal patterns of aboveground net primary productivity in the Eurasian steppe region from 1982 to 2013

Contact Info

Product

Resources

About