Talking about changes in the Muslim-inhabited Niu Jie Street of Beijing, every member of the community would be all smiles. ＂Everything has changed; the mosque, the streetscape and the people, too,＂ they would say.
Background:Insect pests are a significant threat to natural resources and social development.Modeling species assemblages of insect pests can predict spatiotemporal pest dynamics.However,research gaps remain regarding...Background:Insect pests are a significant threat to natural resources and social development.Modeling species assemblages of insect pests can predict spatiotemporal pest dynamics.However,research gaps remain regarding the mechanism for determining species assemblages of insect pests in alpine forest ecosystems.Here,we explored these determinants using a field investigation conducted for insect pests in a region of the Qinghai-Tibet Plateau.We assessed the species assemblages of insect pests in alpine forest ecosystems based on species co-occurrence patterns and species diversity(i.e.,observed diversity,dark diversity,community completeness,and species pool).A probabilistic model was used to test for statistically significant pairwise patterns of species co-occurrence using the presence-absence matrix of pest species based on species interactions.We used ordinary least squares regression modeling to explore relationships between abiotic factors(i.e.,climate factors and human influence)and species diversity.Results:Positive pest species interactions and many association links can occur widely across different investigation sites and parts of plant hosts in alpine forest ecosystems.We detected high dark diversity and low community completeness of insect pests in alpine forest ecosystems.High temperature and precipitation could promote pest species diversity,particularly dark diversity and species pools.Human influence could drive high levels of pest species diversity and lead to dark diversity and species pools.Community completeness could be an effective indicator for insect pest risk assessment.Conclusions:Our study provides new evidence for the determinants of insect pest species assemblages in alpine forest ecosystems from the perspectives of pest species interactions and abiotic factors.The findings of our study could reveal the mechanism for shaping species assemblages and support the prevention and control of insect pests in alpine forest ecosystems.展开更多
In recent years, Guizhou province has been actively promoting the transformation of old communities. By selecting some projects, the transformation of old communities in cities and towns is combined with the work of &...In recent years, Guizhou province has been actively promoting the transformation of old communities. By selecting some projects, the transformation of old communities in cities and towns is combined with the work of "creating a beautiful environment and a happy life together", which can be replicated and popularized, so as to promote the transformation of old communities throughout the province. In 2019, Guizhou province issued a special fund of 700.25 million yuan from the central government for urban affordable housing projects, which was used to transform old urban communities. At the same time, the Technical Guidelines for Renovation of Old Towns in Guizhou Province is compiled as an important basis for the design, implementation, construction, acceptance and management of the renovation of old towns in Guizhou province. In this paper, the reconstruction project of old residential areas in Zhenyuan county city is taken as an example, and a complete reference path is provided from practice.展开更多
文摘Talking about changes in the Muslim-inhabited Niu Jie Street of Beijing, every member of the community would be all smiles. ＂Everything has changed; the mosque, the streetscape and the people, too,＂ they would say.
基金supported by the National Natural Science Foundation of China(Nos.31800449 and 31800464)the project of the third forestry pest survey of Qinghai Province,China.
文摘Background:Insect pests are a significant threat to natural resources and social development.Modeling species assemblages of insect pests can predict spatiotemporal pest dynamics.However,research gaps remain regarding the mechanism for determining species assemblages of insect pests in alpine forest ecosystems.Here,we explored these determinants using a field investigation conducted for insect pests in a region of the Qinghai-Tibet Plateau.We assessed the species assemblages of insect pests in alpine forest ecosystems based on species co-occurrence patterns and species diversity(i.e.,observed diversity,dark diversity,community completeness,and species pool).A probabilistic model was used to test for statistically significant pairwise patterns of species co-occurrence using the presence-absence matrix of pest species based on species interactions.We used ordinary least squares regression modeling to explore relationships between abiotic factors(i.e.,climate factors and human influence)and species diversity.Results:Positive pest species interactions and many association links can occur widely across different investigation sites and parts of plant hosts in alpine forest ecosystems.We detected high dark diversity and low community completeness of insect pests in alpine forest ecosystems.High temperature and precipitation could promote pest species diversity,particularly dark diversity and species pools.Human influence could drive high levels of pest species diversity and lead to dark diversity and species pools.Community completeness could be an effective indicator for insect pest risk assessment.Conclusions:Our study provides new evidence for the determinants of insect pest species assemblages in alpine forest ecosystems from the perspectives of pest species interactions and abiotic factors.The findings of our study could reveal the mechanism for shaping species assemblages and support the prevention and control of insect pests in alpine forest ecosystems.
文摘In recent years, Guizhou province has been actively promoting the transformation of old communities. By selecting some projects, the transformation of old communities in cities and towns is combined with the work of "creating a beautiful environment and a happy life together", which can be replicated and popularized, so as to promote the transformation of old communities throughout the province. In 2019, Guizhou province issued a special fund of 700.25 million yuan from the central government for urban affordable housing projects, which was used to transform old urban communities. At the same time, the Technical Guidelines for Renovation of Old Towns in Guizhou Province is compiled as an important basis for the design, implementation, construction, acceptance and management of the renovation of old towns in Guizhou province. In this paper, the reconstruction project of old residential areas in Zhenyuan county city is taken as an example, and a complete reference path is provided from practice.
