Wetlands are under enormous pressure due to rapid economic development in China. Waterbirds, which depend on wetlands, are therefore facing a dramatic threat. Surveys were conducted in 19 Provinces in the winters of 2011/2012 and 2012/2013. Sites that support internationally important numbers of waterbirds were selected. Seven sites that support 20,000 or more waterbirds and 48 sites that support more than 1% of the global or flyway population of at least one species were found in our survey. Ten (20.8%) of these sites were protected and 10 (20.8%) had no protection. Eight of the 10 unprotected sites were located along coastlines. Of 16 coastal wetland sites, 43.8% were unprotected. The protection of wintering sites of waterbirds should be made a priority and more wetland sites, especially coastal wetland sites, should be protected. Additionally, an intensive site survey should be conducted to gain comprehensive knowledge of the distribution of wintering waterbirds in China to better protect waterbirds and their habitats.
Partial discharge (PD) is an early warning for deterioration of oil-paper insulated equipment, which seriously endangers the safety of power system. It is significant to realize online detection of PD in oil-paper insulated equipment. Due to the advantages of anti-electromagnetic interference and locating the discharge source, the acoustic emission (AE) method is widely used in online PD detection. Conventional piezoelectric transducer (PZT) acoustic sensors cannot be installed inside equipment in practical applications, resulting in low sensitivity and susceptibility to electromagnetic interference from electrical equipment. To solve the above issues, an ultrasonic sensor based on Fabry-Perot (FP) interferometer with gold-coated circular fused silica diaphragm is proposed and experimentally verified. The results show that the fiber optic ultrasonic sensor can be placed inside the oil-paper insulated equipment for partial discharge detection, and has higher sensitivity compared with the traditional PZT.
Wuyi Mountains preserve the primary forest ecosystem characteristic of the mid-subtropics. We established a large-scale plots in this area according to standard international protocols (Center for Tropical Forest Science, CTFS). Community characteristics such as flora composition, floristic characteristics, DBH structure and spatial distribution patterns in a 9.6 ha plot were analyzed. The results showed that the vascular ·研究报告·
The relationship between biodiversity and ecosystem function is crucial for understanding the structure and processes of subtropical forest ecosystems. However, the extent to which biodiversity influences subtropical forest biomass remains unclear. This study applies Bayesian causal inference to explore causal relationships between forest Aboveground Biomass (AGB) and its potential driving factors (biodiversity factors, biotic factors and abiotic factors) based on Huangshan Forest Dynamics Plots. Furthermore, hypothetical interventions are introduced to these driving factors within the causal network to estimate their potential impact on AGB. The causal relationship network reveals that species diversity and functional diversity are the most direct factors influencing AGB, whereas phylogenetic diversity exerts only an indirect effect. Biotic and abiotic factors also contribute indirect effects on AGB, potentially by influencing other mediating indexes. Intervention analysis shows that with low-level interventions on direct influencing factors, the probability of low AGB is as high as 84%. As the intervention level increases to high, the probability of low AGB decreases by 36%. Moreover, AGB demonstrates a particularly sensitive response to changes in Rao’s quadratic entropy (RaoQ) intervention levels, more so than to other factors, highlighting its critical role in maintaining forest biomass. Therefore, we contend that functional diversity, due to its direct reflection of species’ roles in ecosystem processes, is a more accurate measure of the impact of biodiversity on biomass compared to species or phylogenetic diversity and the interplay between abiotic and biotic factors and biodiversity should not be overlooked. This approach offers a powerful tool for exploring causal relationships, thereby providing a more nuanced and accurate understanding of the relationship between biodiversity and forest ecosystem function.
Through literature study,this paper discusses common errors in yoga class and puts forward some solutions.The aim of the paper is to improve entire effective of yoga teaching,in order to realize that yoga become popular in university and implement yoga's fitness function,increase the level of students' mental health,clean up mental handicap,perfect morality and character accomplishment.
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