Longitudinal patterns of periphyton biomass in Qinghai–Tibetan Plateau streams: An indicator of pasture degradation?

Ren, Ze; Jiang, Zuyao; Cai, Qinghua

doi:10.1016/j.quaint.2013.05.025

Cited by 13 publications

(9 citation statements)

References 61 publications

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“…, Ren et al. ). C:N and C:P ratios of stream periphyton generally decrease with increasing nutrient availability, shifting the nutrient limitation regime (Frost et al.…”

Section: Discussionmentioning

confidence: 99%

“…In stream ecosystems, periphyton are tightly linked to watershed conditions because landcover significantly controls the export of C, N, and P from catchments to aquatic ecosystems, potentially shifting in situ periphyton community structure and influencing primary production (Abell et al 2011, Erol and Randhir 2013, Umbanhowar et al 2015. Previous studies have suggested that the community composition, biomass, and stoichiometry of stream periphyton change significantly in response to landcover-induced changes in available nutrients (Hill et al 2011, Drake et al 2012, Ren et al 2013. C:N and C:P ratios of stream periphyton generally decrease with increasing nutrient availability, shifting the nutrient limitation regime (Frost et al 2005, Kohler et al 2011).…”

Section: Discussionmentioning

confidence: 99%

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Cascading influences of grassland degradation on nutrient limitation in a high mountain lake and its inflow streams

Ren

Niu

et al. 2019

Ecology

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Nitrogen (N) and phosphorus (P) are key growth-limiting nutrients for organisms and their absolute and relative supplies regulate the structure and function of ecosystems. Landcover changes lead to modifications of terrestrial biogeochemistry, consequently influencing aquatic nutrient conditions. This study sought to evaluate the potential impacts of grassland degradation on nutrient availability and nutrient limitation in the Qinghai Lake (China) and its inflow streams. We sampled nutrient concentrations and tested stream nutrient limitation by conducting nutrient diffusing substrata (NDS) bioassays in streams flowing through subbasins with different grassland status. To test nutrient limitation and the responses of lake phytoplankton to stream inflows, bioassays were conducted by adding different nutrients (N, P, and joint NP) as well as water from different streams to lake water with phytoplankton, respectively. In general, N concentrations as well as N:P ratios decreased while P concentrations increased with decreased normalized difference vegetation index (NDVI, an index of vegetation status), especially in September, suggesting that grassland degradation (low NDVI) has the potential to differentially decrease N availability and increase P availability in streams. Consistent with this, relative responses (RR) of stream periphyton to P and combined NP enrichments in the NDS bioassays decreased with stream P concentrations while increased with stream water N:P ratios. Lake phytoplankton responded strongly to P and combined NP addition indicating strong P-limitation of lake phytoplankton. RR of lake phytoplankton to stream water decreased with nitrate concentration and N:P ratios in stream water and increased with the concentrations of ammonium, total phosphorus, and soluble reactive phosphorus, indicating that stream water with higher P but lower N and N:P from degraded subcatchments is associated with increased impact on P-limited Lake phytoplankton. Overall, this study suggests that grassland degradation has the potential to differentially influence the nutrients delivered to streams with substantial increases in P but decreases in N and N:P, alleviating P limitation of stream periphyton and, ultimately, stimulating P-limited phytoplankton growth in the lake.

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“…, Ren et al. ). C:N and C:P ratios of stream periphyton generally decrease with increasing nutrient availability, shifting the nutrient limitation regime (Frost et al.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Cascading influences of grassland degradation on nutrient limitation in a high mountain lake and its inflow streams

Ren

Niu

et al. 2019

Ecology

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“…Interestingly, our data showed a contrary pattern, suggesting that human activity had significantly affected the altitudinal pattern of stream periphyton biomass in the Cangshan Mountains. Ren et al (2013) found that periphtyton biomass was closely related to ecological degradation. The altitudinal pattern of stream periphyton biomass suggested that human activities could have resulted in ecological degradation, leading to biomass loss.…”

Section: Altitudinal Pattern Of Periphyton Biomassmentioning

confidence: 99%

Altitudinal pattern of stream periphyton biomass in tributaries of the Lancang–Mekong River: An indicator of anthropogenic impact?

Dong

Sun

et al. 2015

Quaternary International

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“…A large number of observations and research results indicate that in recent decades, significant degradation phenomena, such as the decline of rangeland productivity, severe soil erosion, reduced water yield year by year and sharply shrinking biological diversity have occurred (Liu et al, 2008;Wang and Cheng, 2001;Zhang et al, 2006;Ma, 2006;Ren et al 2013;Gao et al 2010). The ecological system adjustment ability in this area is very weak on account of strong surface weathering, thin solum, coarse texture, cold climate, and short plant growth period (Zhang et al 2015;Zheng et al, 2002).…”

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confidence: 99%

Monitoring rangeland degradation using a novel local NPP scaling based scheme over the “Three-River Headwaters” region, hinterland of the Qinghai-Tibetan Plateau

Wang

Xia

et al. 2017

Quaternary International

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Abstract-the "Three-River Headwaters" region (TRHR) rangeland ecosystem is extremely sensitive and fragile, and in recent years has undergone continuous degradation. The vast area and severe nature conditions inhibit data acquisition and field experiments, resulting in different understandings about the spatial characteristics and dynamics of rangeland degradation in the region. Therefore, reliable monitoring method of rangeland degradation is urgently needed for the rangeland protection and management. In this paper, a novel rangeland degradation monitoring scheme based on Local NPP Scaling (LNS) was suggested;A suitable partition program of rangeland productivity unit was set up by using Analytical Hierarchy Process (

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Longitudinal patterns of periphyton biomass in Qinghai–Tibetan Plateau streams: An indicator of pasture degradation?

Cited by 13 publications

References 61 publications

Cascading influences of grassland degradation on nutrient limitation in a high mountain lake and its inflow streams

Cascading influences of grassland degradation on nutrient limitation in a high mountain lake and its inflow streams

Altitudinal pattern of stream periphyton biomass in tributaries of the Lancang–Mekong River: An indicator of anthropogenic impact?

Monitoring rangeland degradation using a novel local NPP scaling based scheme over the “Three-River Headwaters” region, hinterland of the Qinghai-Tibetan Plateau

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