Limits...
Cuticular waxes in alpine meadow plants: climate effect inferred from latitude gradient in Qinghai-Tibetan Plateau.

Guo Y, Guo N, He Y, Gao J - Ecol Evol (2015)

Bottom Line: The average chain length of n-alkanes in both plant and soil linearly increased with increased temperature, whereas reduced with increased aridity index.No significant correlation could be observed between mean annual precipitation and mean precipitation from June to August and the cuticular wax amounts and average chain length.Our results suggest that the survival of some alpine plants in specific environments might be depended on their abilities in adjusting wax deposition on plant leaves, and the alpine meadow plants as a whole respond to climate change, benefiting the stability of alpine meadow ecosystem.

View Article: PubMed Central - PubMed

Affiliation: College of Agronomy and Biotechnology Southwest University Chongqing 400716 China.

ABSTRACT
Alpine meadow ecosystems are susceptible to climate changes. Still, climate impact on cuticular wax in alpine meadow plants is poorly understood. Assessing the variations of cuticular wax in alpine meadow plants across different latitudes might be useful for predicting how they may respond to climate change. We studied nine alpine meadows in a climate gradient in the east side of Qinghai-Tibetan Plateau, with mean annual temperature ranging from -7.7 to 3.2°C. In total, 42 plant species were analyzed for cuticular wax, averaged 16 plant species in each meadow. Only four plant species could be observed in all sampling meadows, including Kobresia humilis,Potentilla nivea,Anaphalis lacteal, and Leontopodium nanum. The amounts of wax compositions and total cuticular wax in the four plant species varied among sampling meadows, but no significant correlation could be observed between them and temperature, precipitation, and aridity index based on plant species level. To analyze the variations of cuticular wax on community level, we averaged the amounts of n-alkanes, aliphatic acids, primary alcohols, and total cuticular wax across all investigated plant species in each sampling site. The mean annual temperature, mean temperature in July, and aridity index were significantly correlated with the averaged amounts of wax compositions and total cuticular wax. The average chain length of n-alkanes in both plant and soil linearly increased with increased temperature, whereas reduced with increased aridity index. No significant correlation could be observed between mean annual precipitation and mean precipitation from June to August and the cuticular wax amounts and average chain length. Our results suggest that the survival of some alpine plants in specific environments might be depended on their abilities in adjusting wax deposition on plant leaves, and the alpine meadow plants as a whole respond to climate change, benefiting the stability of alpine meadow ecosystem.

No MeSH data available.


Map of the study area. White rectangles indicate sampling areas (1–9).
© Copyright Policy - creativeCommonsBy
Related In: Results  -  Collection


getmorefigures.php?uid=PMC4588662&req=5

ece31677-fig-0001: Map of the study area. White rectangles indicate sampling areas (1–9).

Mentions: The study was conducted on alpine meadows in the east side of the Qinghai‐Tibetan Plateau (Fig. 1). In total, nine sampling areas were set on a transect from northeast (N37.43, E101.16) to southwest (N31.12, E96.35), with altitude ranging from 3447 to 4845 m (Table 1). In each sampling area, there were three sampling sites (100 × 200 m) with similar altitude as three replicates. The distance between sampling sites was beyond 1000 m. The region has a typical plateau continental climate, and the growing period of the plants only lasts 2–3 months from June to August. The mean annual temperature and the mean annual precipitation of the sampling regions range from −7.7 to 3.2°C and 303 to 566 mm, respectively. About 60–70% of the precipitation was in plant growing period. The alpine meadows were owned by local farmers and used mainly for grazing yak and Tibetan sheep. Parts of the meadows were overgrazed and degraded severely (Mazurek and Simoneit 1997). In this study, only meadows with good conditions in fenced pasture were sampled. Plant compositions in alpine meadow varied greatly at different habitats (Wang et al. 2008); therefore, we only investigated the meadows with Kobresia humilis as one of the predominant plant species. The vegetation coverage of the nine sampling areas was all above 90%, and the dominant plant species included K. humilis, K. parva, K. graminifolia, Leontopodium nanum, Potentilla nivea, Anaphalis lacteal, Taraxacum mongolicum, Polygonum viviparum, P. macrophyllum, Lancea tibetica, Carex atrofusca, and Thalictrum alpinum. The soil type was alpine meadow soil (Cambisol, FAO).


Cuticular waxes in alpine meadow plants: climate effect inferred from latitude gradient in Qinghai-Tibetan Plateau.

Guo Y, Guo N, He Y, Gao J - Ecol Evol (2015)

Map of the study area. White rectangles indicate sampling areas (1–9).
© Copyright Policy - creativeCommonsBy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4588662&req=5

ece31677-fig-0001: Map of the study area. White rectangles indicate sampling areas (1–9).
Mentions: The study was conducted on alpine meadows in the east side of the Qinghai‐Tibetan Plateau (Fig. 1). In total, nine sampling areas were set on a transect from northeast (N37.43, E101.16) to southwest (N31.12, E96.35), with altitude ranging from 3447 to 4845 m (Table 1). In each sampling area, there were three sampling sites (100 × 200 m) with similar altitude as three replicates. The distance between sampling sites was beyond 1000 m. The region has a typical plateau continental climate, and the growing period of the plants only lasts 2–3 months from June to August. The mean annual temperature and the mean annual precipitation of the sampling regions range from −7.7 to 3.2°C and 303 to 566 mm, respectively. About 60–70% of the precipitation was in plant growing period. The alpine meadows were owned by local farmers and used mainly for grazing yak and Tibetan sheep. Parts of the meadows were overgrazed and degraded severely (Mazurek and Simoneit 1997). In this study, only meadows with good conditions in fenced pasture were sampled. Plant compositions in alpine meadow varied greatly at different habitats (Wang et al. 2008); therefore, we only investigated the meadows with Kobresia humilis as one of the predominant plant species. The vegetation coverage of the nine sampling areas was all above 90%, and the dominant plant species included K. humilis, K. parva, K. graminifolia, Leontopodium nanum, Potentilla nivea, Anaphalis lacteal, Taraxacum mongolicum, Polygonum viviparum, P. macrophyllum, Lancea tibetica, Carex atrofusca, and Thalictrum alpinum. The soil type was alpine meadow soil (Cambisol, FAO).

Bottom Line: The average chain length of n-alkanes in both plant and soil linearly increased with increased temperature, whereas reduced with increased aridity index.No significant correlation could be observed between mean annual precipitation and mean precipitation from June to August and the cuticular wax amounts and average chain length.Our results suggest that the survival of some alpine plants in specific environments might be depended on their abilities in adjusting wax deposition on plant leaves, and the alpine meadow plants as a whole respond to climate change, benefiting the stability of alpine meadow ecosystem.

View Article: PubMed Central - PubMed

Affiliation: College of Agronomy and Biotechnology Southwest University Chongqing 400716 China.

ABSTRACT
Alpine meadow ecosystems are susceptible to climate changes. Still, climate impact on cuticular wax in alpine meadow plants is poorly understood. Assessing the variations of cuticular wax in alpine meadow plants across different latitudes might be useful for predicting how they may respond to climate change. We studied nine alpine meadows in a climate gradient in the east side of Qinghai-Tibetan Plateau, with mean annual temperature ranging from -7.7 to 3.2°C. In total, 42 plant species were analyzed for cuticular wax, averaged 16 plant species in each meadow. Only four plant species could be observed in all sampling meadows, including Kobresia humilis,Potentilla nivea,Anaphalis lacteal, and Leontopodium nanum. The amounts of wax compositions and total cuticular wax in the four plant species varied among sampling meadows, but no significant correlation could be observed between them and temperature, precipitation, and aridity index based on plant species level. To analyze the variations of cuticular wax on community level, we averaged the amounts of n-alkanes, aliphatic acids, primary alcohols, and total cuticular wax across all investigated plant species in each sampling site. The mean annual temperature, mean temperature in July, and aridity index were significantly correlated with the averaged amounts of wax compositions and total cuticular wax. The average chain length of n-alkanes in both plant and soil linearly increased with increased temperature, whereas reduced with increased aridity index. No significant correlation could be observed between mean annual precipitation and mean precipitation from June to August and the cuticular wax amounts and average chain length. Our results suggest that the survival of some alpine plants in specific environments might be depended on their abilities in adjusting wax deposition on plant leaves, and the alpine meadow plants as a whole respond to climate change, benefiting the stability of alpine meadow ecosystem.

No MeSH data available.