作者机构：
[Luo, Qiao; Yu, Hongbing] Hunan City Univ, Coll Architecture & Urban Planning, Yiyang 413000, Peoples R China.;[Luo, Qiao; Yu, Hongbing] Hunan City Univ, Coll Architecture & Urban Planning, Lab Key Technol Digital Urban Rural Spatial Planni, Yiyang 413000, Peoples R China.;[Li, Yong] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atmo, Beijing 100029, Peoples R China.;[Jiang, Shufang; Cao, Xueyou] Forestry Bur Yiyang City, Yiyang 410004, Peoples R China.
通讯机构：
[Li, Y ] C;Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atmo, Beijing 100029, Peoples R China.
关键词：
South Dongting Lake Nature Reserve;blue space;green space;precipitation;air temperature
摘要：
<jats:p>In recent years, the water level of the Dongting Lake (DTL) has been continuously low, and the wetland area and landscape pattern have changed significantly. Considering the obvious spatial heterogeneity of water regime changes in different waters of the DTL, this paper takes two core areas of the South Dongting Lake Nature Reserve (SDLNR) as study areas and analyzes the spatial distribution characteristics of the wetland blue–green landscape patterns by using remote sensing image data and hydrological and meteorological data. The multi-scale correlation between runoff, precipitation, temperature, and evapotranspiration in the SDLNR was studied via cross-wavelet transform analysis. The results show the following: (1) The change in the blue–green spatial patterns in different regions in different periods is inconsistent, and this inconsistency is related to the topography, climate, and human activities in each region; (2) there are seasonal fluctuations in precipitation, air temperature, and evapotranspiration in the SDLNR. Among them, the annual mean temperature shows a rising trend and passes the significance test with 95% confidence, while the annual mean precipitation and annual mean evapotranspiration show no significant change trend; and (3) our Pearson correlation analysis and cross-wavelet change results show that precipitation and temperature are strongly correlated with runoff, with a resonance period of 8–16 months, while the correlation between evapotranspiration and runoff is not significant. We recommend that policymakers establish an effective early warning system and make plans to store water through micro-terrain transformation in possible climate change treatments and strategies.</jats:p>
摘要：
Acid rain and heavy metal cadmium (Cd) pollution are global environmental problems affecting plants. Plant priming with calcium (Ca) alleviates various environmental stresses. However, the mitigation effect of exogenous Ca on Bermuda grass has not been evaluated under the dual stress of Cd and acid rain. This research was designed to explore the effect of 5 mmol/L Ca on the growth of Bermuda grass seedlings under the combined stress. The results showed that exogenous Ca improved the growth indicators including root length, plant height, stem length, leaf length, root dry weight, stem dry weight, leaf dry weight and total dry weight, reduced the MDA content, and increased the relative chlorophyll content, SOD, POD and CAT activity, and N, P, K contents in different organs. The alleviating effect of exogenous Ca was be limited by acid rain intensity. Exogenous Ca had a significant alleviating effect on plants under combined stress of Cd and pH4.5 acid rain, and promoted the Cd uptake in plants. This research provided a scientific basis for further understanding the positive effects of exogenous Ca on plant growth under the combined stress of Cd and acid rain, and phytoremediation of soil Cd pollution in acid rain areas.
期刊：
International Journal of Environmental Technology and Management,2021年24(3-4):150-167 ISSN：1466-2132
作者机构：
College of Architecture and Urban Planning, Hunan City University, Yiyang, 413000, China;Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, 413000, China;Hunan Urban and Rural Ecological Planning, Restoration Engineering Technology Research Center, Yiyang, 413000, China;[Yu H.] College of Architecture and Urban Planning, Hunan City University, Yiyang, 413000, China<&wdkj&>Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, 413000, China<&wdkj&>Hunan Urban and Rural Ecological Planning, Restoration Engineering Technology Research Center, Yiyang, 413000, China
期刊：
International Journal of Environmental Technology and Management,2021年24(3/4):150-167 ISSN：1466-2132
作者机构：
[Hongbing Yu] College of Architecture and Urban Planning, Hunan City University, Yiyang, 413000, China;Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, 413000, China;Hunan Urban and Rural Ecological Planning and Restoration Engineering Technology Research Center, Yiyang, 413000, China;[Hongbing Yu] Key Laboratory of Key Technologies of Digital Urban-Rural Spatial Planning of Hunan Province, Yiyang, 413000, China;[Hongbing Yu] Hunan Urban and Rural Ecological Planning and Restoration Engineering Technology Research Center, Yiyang, 413000, China
摘要：
In order to solve the current water pollution problem caused by industrial wastewater, the purification mechanism of aquatic garden plants on industrial wastewater is analysed and studied. The treatment process and influencing factors of plants in the purification process are analysed separately, and the purification mechanism of aquatic garden plants on different pollutant components in industrial wastewater is derived from a theoretical perspective. In order to verify the analysis results of the purification mechanism, the actual measurement analysis experiment of the purification effect of aquatic garden plants on industrial wastewater was designed. The experimental results show that aquatic garden plants can effectively reduce the content of TN, TP, COD, NH4+-N and heavy metals in industrial wastewater, and therefore have a high purification effect on industrial wastewater. Among a variety of aquatic garden plants, water onions and Canna's purifying effect is more obvious, and the removal rate can reach 83%.
