A new species of Populus and the extensive hybrid speciation arising from it on the Qinghai-Tibet Plateau.

While the diversity of species formation is broadly acknowledged, significant debate exists regarding the universal nature of hybrid species formation. Through an 18-year comprehensive study of all Populus species on the Qinghai-Tibet Plateau, 23 previously recorded species and 8 new species were identified. Based on morphological characteristics, these can be classified into three groups: species in section Leucoides, species with large leaves, and species with small leaves in section Tacamahaca.

A model of hybrid speciation process drawn from three new poplar species originating from distant hybridization between sections.

Although numerous studies have been conducted on hybrid speciation, our understanding of this process remains limited. Through an 18-year systematic investigation of all taxa of Populus on the Qinghai-Tibet Plateau, we discovered three new taxa with clear characteristics of sect. Leucoides.

[Response of Riverine Nitrogen Exports to Land Use Pattern and Hydrological Regime in the Jiulong River Watershed].

Watershed land use patterns combined with hydrological regimes affect riverine nitrogen (N) sources, transformation pathways, and exports, which can affect watershed health and freshwater ecosystem service supply. Understanding how land use and hydrological regimes affect riverine N exports is therefore useful for developing sustainable watershed management strategies. Based on in-situ observations during the period 2010-2017, watershed modeling, geospatial technology, and statistical analysis were coupled in this study to explore the responses of riverine nitrogen exports to watershed land use pattern and hydrological regime in a medium-sized watershed.

External application of nitrogen alleviates toxicity of cadmium on poplars via starch and sucrose metabolism.

Phytoremediation technology can help achieve moderate cost and considerable effect with respect to the remediation of heavy metal (HM) pollution in soil and water. Many previous studies have suggested the role of nitrogen (N) in the alleviation of effects of HM on plants. Herein, we sought to determine the molecular mechanisms by which additional N supplementation mitigates cadmium (Cd) toxicity in poplars using a combination of physiological, transcriptomic and phosphoproteomic analyses.

[Responses of Riverine Phosphorus Exports to Land Use and Hydrological Regime in the Jiulong River Watershed].

In-situ monitoring, geographic information technology (GIS), watershed model, and statistical techniques were coupled in this study to explore the responses of riverine phosphorus exports to land use pattern and hydrological regime in the Jiulong River Watershed (JRW). We analyzed riverine phosphorus concentrations and exports from March 2015 to February 2017 across a land use gradient spanning 14 monitored sampling sites. Results showed that significantly spatial and seasonal variations of phosphorus concentrations and exports were observed in JRW.

[Artificial radial head replacement for the treatment of comminuted fractures of the radial head].

Objective: To assess the clinical effects of artificial radial head prosthesis replacement for the treatment of comminuted fracture of the radial head.

Methods: From June 2011 to June 2015, 25 patients with radial head comminuted fracture were treated with artificial radial head replacement, including 10 males and 15 females, ranging in age form 24 to 61 years old(mean, 40 years old). The functional recovery of the patients suffering from limb and elbow in different periods, the activity degree of the elbow joint and the function of the elbow in the latest follow-up were compared.

[Seasonal Variation on Nutrient Limitation for Phytoplankton Growth in a Coastal River-Reservoir System, Southeast China].

A comprehensive analysis was conducted using a dataset obtained from October in 2013 to October in 2014 monitoring in 20 headwater streams of Jiulong River and four reservoirs, situated in such a coastal river-reservoir system in Southeast China suffering from intensive anthropogenic disturbance. In-situ monitoring, GIS and statistical analysis were coupled in this study to identify the spatiotemporal variations of nutrients & phytoplankton abundance and community structure, the differentiation of nitrogen & phosphorus limitation of phytoplankton growth, and the seasonal variations in nutrient limitation of phytoplankton growth. The results showed that there were obvious spatiotemporal variations in terms of nutrients & phytoplankton abundance and community structure in the 20 headwater streams and four reservoirs.

[Parameter uncertainty analysis for urban rainfall runoff modelling].

An urban watershed in Xiamen was selected to perform the parameter uncertainty analysis for urban stormwater runoff modeling in terms of identification and sensitivity analysis based on storm water management model (SWMM) using Monte-Carlo sampling and regionalized sensitivity analysis (RSA) algorithm. Results show that Dstore-Imperv, Dstore-Perv and Curve Number (CN) are the identifiable parameters with larger K-S values in hydrological and hydraulic module, and the rank of K-S values in hydrological and hydraulic module is Dstore-Imperv > CN > Dstore-Perv > N-Perv > conductivity > Con-Mann > N-Imperv. With regards to water quality module, the parameters in exponent washoff model including Coefficient and Exponent and the Max.

[Preliminary analysis of spatiotemporal variation of water quality and its influencing factors in the Jiulong River watershed].

Twenty one sub-watersheds in the Jiulong River watershed were chosen for in-situ monitoring water quality of baseflow in flood season, dry season and average season in 2010. Geographical information system and multivariate analysis were coupled to characterize the spatiotemporal variation of water quality and identify its influencing factors. The results show that the water quality in dry season is the worst whereas the water quality in flood season is comparatively good.

[Study on the linkage between urban built-up land and water quality in the Jiulong River watershed].

Band grouping indices combined with single band characteristic were used to extract urban built-up land based on satellite image in the Jiulong River Watershed. Landscape ecology method and statistical analysis were employed to explore the relationship between urban built-up land and permanganate index, NH4(+) -N, TP concentrations. There were significantly positive correlations between the proportion of urban built-up land and permanganate index, NH4(+) -N, TP (r = 0.

[Preliminary study on linking land use & landscape pattern and water quality in the Jiulong River watershed].

Geospatial analysis and statistical analysis were integrated to link land use & landscape pattern and water quality in 2002 and 2007 at the entire watershed and buffer zone scale in the Jiulong River Watershed. Results show that the relationships between land use & landscape pattern and water quality in 2002 and 2007 were basically consistent, namely: (1) Percentage of built-up area was positively correlated with BOD5, NO3(-)-N, NH4(+)-N and permanganate index, and negatively correlated with DO; percentage of woodland area was positively correlated with NO3(-)-N, NH4(+)-N and permanganate index; percentage of cropland area was negatively correlated with NO3(-)-N, NH4(+)-N and permanganate index. (2) SHDI was positively correlated with permanganate index, TP, NH4(+)-N, and negatively correlated with DO at the entire watershed and buffer scale; LPI was negatively correlated with BOD5, permanganate index, TP and NH4(+)-N, and positively correlated with DO at the entire watershed and buffer zone scale; PD was positively correlated with BOD5, TP and NH4(+)-N; Most of the landscape pattern metrics was not the good predictors for water quality in study watershed.

[Local sensitivity and its stationarity analysis for urban rainfall runoff modelling].

Sensitivity analysis of urban-runoff simulation is a crucial procedure for parameter identification and uncertainty analysis. Local sensitivity analysis using Morris screening method was carried out for urban rainfall runoff modelling based on Storm Water Management Model (SWMM). The results showed that Area, % Imperv and Dstore-Imperv are the most sensitive parameters for both total runoff volume and peak flow.

[Identification of spatio-temporal variation in the seaside water quality along Macau Peninsula].

Cluster analysis (CA) and discriminant analysis (DA) were coupled to identify the spatial and temporal variation of the seaside water quality for 14 parameters and 22 different sites along Macau Peninsula, so as to identify the temporal and spatial variation for further optimizing the monitoring network and controlling the seaside water quality along Macau Peninsula. The results show that 12 months could be grouped into two periods, June-September and the remaining months, and the entire area was divided into two clusters, one located at western sides of Macau Peninsula, and another one is in southeast and southern sides of the Macau peninsula. Through backward stepwise DA, pH, Cl-, TSS, color and TP, Cl-, color, NH4+, DO, COD were identified as the discriminant variables of spatial and temporal variation, with 84.

[Comparative study on characteristics of urban rainfall runoff from two urban lawn catchments in Macau and Xiamen].

A comparative study on characteristics of stormwater runoff from two urban lawn catchments in Macau (ELH) and Xiamen (PGH) with separated sewer system were conducted. The result obtained shows that COD, TP and NO3- -N are the major pollutants with mean EMC of 165.77-60.

[Hydrology and pollution characteristics of urban runoff: Beijing as a sample].

The purpose of this study is identification and characterization of hydrological process of urban runoff, as well as concentration variation of pollutants in it. Samples were collected in 4 rainfall events in Beijing from Jun. 2006 to Aug.

Characterization of surface runoff from a subtropics urban catchment.

Characteristics of surface runoff from a 0.14-km2 urban catchment with separated sewer in Macau was investigated. Water quality measurements of surface runoff were carried out on five rainfall events during the period of August to November, 2005.

[Characterization of urban surface runoff in two urban catchments in Macau].

Characteristics of pollutants from urban surface runoff were investigated. Two catchments with a seperated system in Macau were selected for sampling on rainfall events during the period of August to November, 2005. Water quality parameters such as pH, turbidity, TSS, COD, TOC, TN, TP, Zn, Pb, and Cu were analyzed.

[Modelling pollutant loads and management alternatives in Jiulong River watershed with AnnAGNPS].

The modelling package Annualized Agricultural Nonpoint Source Model (AnnAGNPS) was used to predict pollutant loads, and simulate catchment processes and management practices in Jiulong River watershed, a medium-sized mountainous watershed in southeast of China. Four typical sub-watersheds were primarily chosen to calibrate AnnAGNPS model by data collected from storm events during the period of April to September, 2003. The model was further validated in the two biggest branches of Jiulong River watershed, i.