Coastal areas face challenges in updating and enhancing the quality of coastal shelterbelt forests due to limited soil resource utilization,the biological characteristics of tree species,and the impact of coastal stor...Coastal areas face challenges in updating and enhancing the quality of coastal shelterbelt forests due to limited soil resource utilization,the biological characteristics of tree species,and the impact of coastal storm surges.This study,based on clarifying the connotation of stand quality(SQ)for Casuarina equisetifolia(C.equisetifolia),a typical coastal shelterbelt species,integrates stand growth conditions and structure,applying the AHP-EWM method to construct an SQ evaluation model.The model identifies key factors influencing the quality of C.equisetifolia stands and explores the mechanisms driving their growth processes.The results indicate that mean tree height,mean diameter at breast height,and stand density are key indicators for assessing the SQ of C.equisetifolia stands.The SQ of C.equisetifolia coastal shelterbelt stands varies across different land-sea positions,mainly influenced by stand age and soil nutrient levels.As stand age increases,the SQ initially improves and then declines.Additionally,C.equisetifolia trees growing in nutrient-rich soils exhibit better growth and higher SQ than those in poor soils.The findings of this study provide a theoretical foundation for the management and quality enhancement of coastal shelterbelt forests.展开更多
With the development of hydraulic engineering such as harbor,channel and reclamation,more and more natural tidal flat turn into the semi-natural tidal flat(SNTF).How to evaluate ecosystem of semi-natural tidal flat is...With the development of hydraulic engineering such as harbor,channel and reclamation,more and more natural tidal flat turn into the semi-natural tidal flat(SNTF).How to evaluate ecosystem of semi-natural tidal flat is a scientific problem that has not been fully solved.The study tries to assess ecosystem health change of SNTF adjoining Hengsha East Shoal training dike in the Yangtze estuary.The study found SNTF area>0m isobaths increased from 30.33 km^(2) in 2010-2014 to 46.66 km^(2) in 2014-2017 and to 56.84 km^(2) in 2017-2020,and the Hengsha Shoal region.0m,-2m and-5m isobaths increased from 174.78 km^(2),303.82 km^(2),and 556.77 km^(2) in 2010-2014 to 233.34 km^(2),365.59 km^(2),and 596.83 km^(2) in 2014-2017 and to 243.81 km^(2),363.27 km^(2) and 567.45 km^(2) in 2017-2020.Using database of 3 pressure indicators,16 state indicators and 3 response indicators,the study combined pressure-state-response(PSR)model and fuzzy comprehensive evaluation(FCE),constructed a systematic evaluation method of ecosystem health of semi-natural tidal flat.The evaluation result found the ecosystem health of SNTF of Hengsha East Shoal was rated as"Fair"level during 2010-2020,and the summation of comprehensive evaluation index(CEI)increased from 0.4009 in 2010-2014 to 0.4703 in 2014-2017 due to the rapid expansion of tidal flat vegetation,and then decreased to 0.4450 in 2017-2020 due to a reduction in vegetation area caused by erosion.The area of salt marsh vegetation plays an important role in the health of wetland ecosystems.The Hengsha East Shoal ecosystem is undergoing a quickly dynamic evolution processes,long-term series monitoring and further research for this area are necessary to guide its future development according to the tidal flat utilization patterns.展开更多
基金supported by the Fujian Forestry Science and Technology Research Project(2023FKJ15)Fuzhou Forestry Science and Technology Research Project(2130206)+1 种基金Special Fund Project for Scientific and Technological Innovation of Fujian Agriculture and Forestry University(KFB23173)University Key Lab for Geomatics Technology&Optimize Resources Utilization in Fujian Province(KJG20104A).
文摘Coastal areas face challenges in updating and enhancing the quality of coastal shelterbelt forests due to limited soil resource utilization,the biological characteristics of tree species,and the impact of coastal storm surges.This study,based on clarifying the connotation of stand quality(SQ)for Casuarina equisetifolia(C.equisetifolia),a typical coastal shelterbelt species,integrates stand growth conditions and structure,applying the AHP-EWM method to construct an SQ evaluation model.The model identifies key factors influencing the quality of C.equisetifolia stands and explores the mechanisms driving their growth processes.The results indicate that mean tree height,mean diameter at breast height,and stand density are key indicators for assessing the SQ of C.equisetifolia stands.The SQ of C.equisetifolia coastal shelterbelt stands varies across different land-sea positions,mainly influenced by stand age and soil nutrient levels.As stand age increases,the SQ initially improves and then declines.Additionally,C.equisetifolia trees growing in nutrient-rich soils exhibit better growth and higher SQ than those in poor soils.The findings of this study provide a theoretical foundation for the management and quality enhancement of coastal shelterbelt forests.
基金financially sponsored by Shanghai Investigation,Design&Research Institute Co.,Ltd.Scientific Research Project(2023HJ(83)-001).
文摘With the development of hydraulic engineering such as harbor,channel and reclamation,more and more natural tidal flat turn into the semi-natural tidal flat(SNTF).How to evaluate ecosystem of semi-natural tidal flat is a scientific problem that has not been fully solved.The study tries to assess ecosystem health change of SNTF adjoining Hengsha East Shoal training dike in the Yangtze estuary.The study found SNTF area>0m isobaths increased from 30.33 km^(2) in 2010-2014 to 46.66 km^(2) in 2014-2017 and to 56.84 km^(2) in 2017-2020,and the Hengsha Shoal region.0m,-2m and-5m isobaths increased from 174.78 km^(2),303.82 km^(2),and 556.77 km^(2) in 2010-2014 to 233.34 km^(2),365.59 km^(2),and 596.83 km^(2) in 2014-2017 and to 243.81 km^(2),363.27 km^(2) and 567.45 km^(2) in 2017-2020.Using database of 3 pressure indicators,16 state indicators and 3 response indicators,the study combined pressure-state-response(PSR)model and fuzzy comprehensive evaluation(FCE),constructed a systematic evaluation method of ecosystem health of semi-natural tidal flat.The evaluation result found the ecosystem health of SNTF of Hengsha East Shoal was rated as"Fair"level during 2010-2020,and the summation of comprehensive evaluation index(CEI)increased from 0.4009 in 2010-2014 to 0.4703 in 2014-2017 due to the rapid expansion of tidal flat vegetation,and then decreased to 0.4450 in 2017-2020 due to a reduction in vegetation area caused by erosion.The area of salt marsh vegetation plays an important role in the health of wetland ecosystems.The Hengsha East Shoal ecosystem is undergoing a quickly dynamic evolution processes,long-term series monitoring and further research for this area are necessary to guide its future development according to the tidal flat utilization patterns.
