Enclosure is commonly used in the restoration of degraded grasslands.However,the effects of enclosure on grassland plant and soil restoration remain controversial,particularly in deserts.To assess the effects of enclo...Enclosure is commonly used in the restoration of degraded grasslands.However,the effects of enclosure on grassland plant and soil restoration remain controversial,particularly in deserts.To assess the effects of enclosure on desert plants and soil properties,using high throughput sequencing,the differences between plants and soil were systematically analyzed before and after enclosure construction.The soil organic carbon,total nitrogen and total phosphorus contents of the three desert flora increased and decreased,but the difference was not significant;enclosure increased plant height,coverage,aboveground biomass,and species richness by 58.99%,59.35%,33.29%,and 51.21%,respectively,in a Seriphidium transiliense formation;by 15.49%,33.52%,20.85%,and 5.13%,respectively,in a Haloxylon persicum formation;and by 83.80%,31.51%,76.66%and 33.33%,respectively,in an Anabasis salsa formation.For soil bacteria,enclosure significantly increased the average number of operational taxonomic units and Shannon-Wiener index by 12.74% and 2.92%,respectively,under S.transiliense formation and by 17.08% and 3.17%,respectively,under H.persicum formation.However,enclosure had no significant effect on the average number of operational taxonomic units or Shannon-Wiener index under A.salsa formation.Enclosure significantly increased desert plants,soil bacterial diversity,and desert plant community productivity;however,the increase in soil nutrient content was not significant.These results demonstrate that enclosure is effective for restoring desert ecosystems but may have little effect on the soil nutrient content.展开更多
The mining of placer iron ore greatly influences the surrounding desert grassland.In Agdala Town,Qinghe County,Xinjiang,the soil seed bank is severely damaged,and the utilization and productivity of desert grasslands ...The mining of placer iron ore greatly influences the surrounding desert grassland.In Agdala Town,Qinghe County,Xinjiang,the soil seed bank is severely damaged,and the utilization and productivity of desert grasslands are almost zero,which seriously affects the safety of the ecological environment and the development of local animal husbandry.It is very important to supplement soil seed banks to enhance the species composition of desert grasslands after ecological restoration.In this study,the effects of the seed bank,species composition,and seed burial depth on the seedling emergence rate at placer iron ore site before and after artificial seed bank replenishment were compared using the germination tray method.The original soil seed bank in the study area contained only four species,which were all annual plants.The dominant species were Salsola ruthenica and Corispermum orientale,and the soil seed bank density was very small.The emergence regularity of the soil seed bank was closely related to water content,and the emergence of annual vegetation was explosive.Seed burial depth affected the emergence rate of perennial grass,and we determined that a burial depth of 0–5 cm was the most effective for emergence.This indicates that seedling emergence of artificially supplemented soil seed bank can be completed within 7 days if the sowing depth is appropriate;sowing depths greater than 5 cm affect seed germination.These findings provide a basis for selecting species to populate large areas.展开更多
基金The National Basic Resources Survey Project of China(2017FY100201)。
文摘Enclosure is commonly used in the restoration of degraded grasslands.However,the effects of enclosure on grassland plant and soil restoration remain controversial,particularly in deserts.To assess the effects of enclosure on desert plants and soil properties,using high throughput sequencing,the differences between plants and soil were systematically analyzed before and after enclosure construction.The soil organic carbon,total nitrogen and total phosphorus contents of the three desert flora increased and decreased,but the difference was not significant;enclosure increased plant height,coverage,aboveground biomass,and species richness by 58.99%,59.35%,33.29%,and 51.21%,respectively,in a Seriphidium transiliense formation;by 15.49%,33.52%,20.85%,and 5.13%,respectively,in a Haloxylon persicum formation;and by 83.80%,31.51%,76.66%and 33.33%,respectively,in an Anabasis salsa formation.For soil bacteria,enclosure significantly increased the average number of operational taxonomic units and Shannon-Wiener index by 12.74% and 2.92%,respectively,under S.transiliense formation and by 17.08% and 3.17%,respectively,under H.persicum formation.However,enclosure had no significant effect on the average number of operational taxonomic units or Shannon-Wiener index under A.salsa formation.Enclosure significantly increased desert plants,soil bacterial diversity,and desert plant community productivity;however,the increase in soil nutrient content was not significant.These results demonstrate that enclosure is effective for restoring desert ecosystems but may have little effect on the soil nutrient content.
基金The Project of Xinjiang Uygur Autonomous Region(2020D01A38)。
文摘The mining of placer iron ore greatly influences the surrounding desert grassland.In Agdala Town,Qinghe County,Xinjiang,the soil seed bank is severely damaged,and the utilization and productivity of desert grasslands are almost zero,which seriously affects the safety of the ecological environment and the development of local animal husbandry.It is very important to supplement soil seed banks to enhance the species composition of desert grasslands after ecological restoration.In this study,the effects of the seed bank,species composition,and seed burial depth on the seedling emergence rate at placer iron ore site before and after artificial seed bank replenishment were compared using the germination tray method.The original soil seed bank in the study area contained only four species,which were all annual plants.The dominant species were Salsola ruthenica and Corispermum orientale,and the soil seed bank density was very small.The emergence regularity of the soil seed bank was closely related to water content,and the emergence of annual vegetation was explosive.Seed burial depth affected the emergence rate of perennial grass,and we determined that a burial depth of 0–5 cm was the most effective for emergence.This indicates that seedling emergence of artificially supplemented soil seed bank can be completed within 7 days if the sowing depth is appropriate;sowing depths greater than 5 cm affect seed germination.These findings provide a basis for selecting species to populate large areas.
